/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.provider;

import static android.provider.SettingsValidators.ANY_INTEGER_VALIDATOR;
import static android.provider.SettingsValidators.ANY_STRING_VALIDATOR;
import static android.provider.SettingsValidators.BOOLEAN_VALIDATOR;
import static android.provider.SettingsValidators.COMPONENT_NAME_VALIDATOR;
import static android.provider.SettingsValidators.LENIENT_IP_ADDRESS_VALIDATOR;
import static android.provider.SettingsValidators.LOCALE_VALIDATOR;
import static android.provider.SettingsValidators.NON_NEGATIVE_INTEGER_VALIDATOR;
import static android.provider.SettingsValidators.PACKAGE_NAME_VALIDATOR;
import static android.provider.SettingsValidators.URI_VALIDATOR;

import android.Manifest;
import android.annotation.IntDef;
import android.annotation.IntRange;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.RequiresPermission;
import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.annotation.SystemApi;
import android.annotation.TestApi;
import android.annotation.UserIdInt;
import android.app.ActivityThread;
import android.app.AppOpsManager;
import android.app.Application;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.SearchManager;
import android.app.WallpaperManager;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.IContentProvider;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.SQLException;
import android.location.LocationManager;
import android.net.ConnectivityManager;
import android.net.NetworkScoreManager;
import android.net.Uri;
import android.net.wifi.WifiManager;
import android.os.BatteryManager;
import android.os.Binder;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import android.os.DropBoxManager;
import android.os.IBinder;
import android.os.LocaleList;
import android.os.Process;
import android.os.RemoteException;
import android.os.ResultReceiver;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.provider.SettingsValidators.Validator;
import android.speech.tts.TextToSpeech;
import android.telephony.SubscriptionManager;
import android.text.TextUtils;
import android.util.AndroidException;
import android.util.ArrayMap;
import android.util.ArraySet;
import android.util.Log;
import android.util.MemoryIntArray;
import android.view.textservice.TextServicesManager;

import com.android.internal.annotations.GuardedBy;
import com.android.internal.widget.ILockSettings;

import java.io.IOException;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.net.URISyntaxException;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

/**
 * The Settings provider contains global system-level device preferences.
 */
public final class Settings {

    // Intent actions for Settings

    /**
     * Activity Action: Show system settings.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SETTINGS = "android.settings.SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of APNs.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APN_SETTINGS = "android.settings.APN_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of current location
     * sources.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_LOCATION_SOURCE_SETTINGS =
            "android.settings.LOCATION_SOURCE_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of users.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_USER_SETTINGS =
            "android.settings.USER_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of wireless controls
     * such as Wi-Fi, Bluetooth and Mobile networks.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_WIRELESS_SETTINGS =
            "android.settings.WIRELESS_SETTINGS";

    /**
     * Activity Action: Show tether provisioning activity.
     *
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: {@link ConnectivityManager#EXTRA_TETHER_TYPE} should be included to specify which type
     * of tethering should be checked. {@link ConnectivityManager#EXTRA_PROVISION_CALLBACK} should
     * contain a {@link ResultReceiver} which will be called back with a tether result code.
     * <p>
     * Output: The result of the provisioning check.
     * {@link ConnectivityManager#TETHER_ERROR_NO_ERROR} if successful,
     * {@link ConnectivityManager#TETHER_ERROR_PROVISION_FAILED} for failure.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_TETHER_PROVISIONING =
            "android.settings.TETHER_PROVISIONING_UI";

    /**
     * Activity Action: Show settings to allow entering/exiting airplane mode.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_AIRPLANE_MODE_SETTINGS =
            "android.settings.AIRPLANE_MODE_SETTINGS";

    /**
     * Activity Action: Show mobile data usage list.
     * <p>
     * Input: {@link EXTRA_NETWORK_TEMPLATE} and {@link EXTRA_SUB_ID} should be included to specify
     * how and what mobile data statistics should be collected.
     * <p>
     * Output: Nothing
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MOBILE_DATA_USAGE =
            "android.settings.MOBILE_DATA_USAGE";

    /** @hide */
    public static final String EXTRA_NETWORK_TEMPLATE = "network_template";

    /**
     * An int extra specifying a subscription ID.
     *
     * @see android.telephony.SubscriptionInfo#getSubscriptionId
     */
    public static final String EXTRA_SUB_ID = "android.provider.extra.SUB_ID";

    /**
     * Activity Action: Modify Airplane mode settings using a voice command.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard against this.
     * <p>
     * This intent MUST be started using
     * {@link android.service.voice.VoiceInteractionSession#startVoiceActivity
     * startVoiceActivity}.
     * <p>
     * Note: The activity implementing this intent MUST verify that
     * {@link android.app.Activity#isVoiceInteraction isVoiceInteraction} returns true before
     * modifying the setting.
     * <p>
     * Input: To tell which state airplane mode should be set to, add the
     * {@link #EXTRA_AIRPLANE_MODE_ENABLED} extra to this Intent with the state specified.
     * If the extra is not included, no changes will be made.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_VOICE_CONTROL_AIRPLANE_MODE =
            "android.settings.VOICE_CONTROL_AIRPLANE_MODE";

    /**
     * Activity Action: Show settings for accessibility modules.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ACCESSIBILITY_SETTINGS =
            "android.settings.ACCESSIBILITY_SETTINGS";

    /**
     * Activity Action: Show settings to control access to usage information.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_USAGE_ACCESS_SETTINGS =
            "android.settings.USAGE_ACCESS_SETTINGS";

    /**
     * Activity Category: Show application settings related to usage access.
     * <p>
     * An activity that provides a user interface for adjusting usage access related
     * preferences for its containing application. Optional but recommended for apps that
     * use {@link android.Manifest.permission#PACKAGE_USAGE_STATS}.
     * <p>
     * The activity may define meta-data to describe what usage access is
     * used for within their app with {@link #METADATA_USAGE_ACCESS_REASON}, which
     * will be displayed in Settings.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.INTENT_CATEGORY)
    public static final String INTENT_CATEGORY_USAGE_ACCESS_CONFIG =
            "android.intent.category.USAGE_ACCESS_CONFIG";

    /**
     * Metadata key: Reason for needing usage access.
     * <p>
     * A key for metadata attached to an activity that receives action
     * {@link #INTENT_CATEGORY_USAGE_ACCESS_CONFIG}, shown to the
     * user as description of how the app uses usage access.
     * <p>
     */
    public static final String METADATA_USAGE_ACCESS_REASON =
            "android.settings.metadata.USAGE_ACCESS_REASON";

    /**
     * Activity Action: Show settings to allow configuration of security and
     * location privacy.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SECURITY_SETTINGS =
            "android.settings.SECURITY_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of trusted external sources
     *
     * Input: Optionally, the Intent's data URI can specify the application package name to
     * directly invoke the management GUI specific to the package name. For example
     * "package:com.my.app".
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MANAGE_UNKNOWN_APP_SOURCES =
            "android.settings.MANAGE_UNKNOWN_APP_SOURCES";

    /**
     * Activity Action: Show trusted credentials settings, opening to the user tab,
     * to allow management of installed credentials.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_TRUSTED_CREDENTIALS_USER =
            "com.android.settings.TRUSTED_CREDENTIALS_USER";

    /**
     * Activity Action: Show dialog explaining that an installed CA cert may enable
     * monitoring of encrypted network traffic.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this. Add {@link #EXTRA_NUMBER_OF_CERTIFICATES} extra to indicate the
     * number of certificates.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MONITORING_CERT_INFO =
            "com.android.settings.MONITORING_CERT_INFO";

    /**
     * Activity Action: Show settings to allow configuration of privacy options.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_PRIVACY_SETTINGS =
            "android.settings.PRIVACY_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of VPN.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_VPN_SETTINGS =
            "android.settings.VPN_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of Wi-Fi.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_WIFI_SETTINGS =
            "android.settings.WIFI_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of a static IP
     * address for Wi-Fi.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard
     * against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_WIFI_IP_SETTINGS =
            "android.settings.WIFI_IP_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of data and view data usage.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_DATA_USAGE_SETTINGS =
            "android.settings.DATA_USAGE_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of Bluetooth.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_BLUETOOTH_SETTINGS =
            "android.settings.BLUETOOTH_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of Assist Gesture.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ASSIST_GESTURE_SETTINGS =
            "android.settings.ASSIST_GESTURE_SETTINGS";

    /**
     * Activity Action: Show settings to enroll fingerprints, and setup PIN/Pattern/Pass if
     * necessary.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_FINGERPRINT_ENROLL =
            "android.settings.FINGERPRINT_ENROLL";

    /**
     * Activity Action: Show settings to allow configuration of cast endpoints.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_CAST_SETTINGS =
            "android.settings.CAST_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of date and time.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_DATE_SETTINGS =
            "android.settings.DATE_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of sound and volume.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SOUND_SETTINGS =
            "android.settings.SOUND_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of display.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_DISPLAY_SETTINGS =
            "android.settings.DISPLAY_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of Night display.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NIGHT_DISPLAY_SETTINGS =
            "android.settings.NIGHT_DISPLAY_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of locale.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_LOCALE_SETTINGS =
            "android.settings.LOCALE_SETTINGS";

    /**
     * Activity Action: Show settings to configure input methods, in particular
     * allowing the user to enable input methods.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_VOICE_INPUT_SETTINGS =
            "android.settings.VOICE_INPUT_SETTINGS";

    /**
     * Activity Action: Show settings to configure input methods, in particular
     * allowing the user to enable input methods.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_INPUT_METHOD_SETTINGS =
            "android.settings.INPUT_METHOD_SETTINGS";

    /**
     * Activity Action: Show settings to enable/disable input method subtypes.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * To tell which input method's subtypes are displayed in the settings, add
     * {@link #EXTRA_INPUT_METHOD_ID} extra to this Intent with the input method id.
     * If there is no extra in this Intent, subtypes from all installed input methods
     * will be displayed in the settings.
     *
     * @see android.view.inputmethod.InputMethodInfo#getId
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_INPUT_METHOD_SUBTYPE_SETTINGS =
            "android.settings.INPUT_METHOD_SUBTYPE_SETTINGS";

    /**
     * Activity Action: Show settings to manage the user input dictionary.
     * <p>
     * Starting with {@link android.os.Build.VERSION_CODES#KITKAT},
     * it is guaranteed there will always be an appropriate implementation for this Intent action.
     * In prior releases of the platform this was optional, so ensure you safeguard against it.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_USER_DICTIONARY_SETTINGS =
            "android.settings.USER_DICTIONARY_SETTINGS";

    /**
     * Activity Action: Show settings to configure the hardware keyboard.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_HARD_KEYBOARD_SETTINGS =
            "android.settings.HARD_KEYBOARD_SETTINGS";

    /**
     * Activity Action: Adds a word to the user dictionary.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: An extra with key <code>word</code> that contains the word
     * that should be added to the dictionary.
     * <p>
     * Output: Nothing.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_USER_DICTIONARY_INSERT =
            "com.android.settings.USER_DICTIONARY_INSERT";

    /**
     * Activity Action: Show settings to allow configuration of application-related settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APPLICATION_SETTINGS =
            "android.settings.APPLICATION_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of application
     * development-related settings.  As of
     * {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1} this action is
     * a required part of the platform.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APPLICATION_DEVELOPMENT_SETTINGS =
            "android.settings.APPLICATION_DEVELOPMENT_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of quick launch shortcuts.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_QUICK_LAUNCH_SETTINGS =
            "android.settings.QUICK_LAUNCH_SETTINGS";

    /**
     * Activity Action: Show settings to manage installed applications.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MANAGE_APPLICATIONS_SETTINGS =
            "android.settings.MANAGE_APPLICATIONS_SETTINGS";

    /**
     * Activity Action: Show settings to manage all applications.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MANAGE_ALL_APPLICATIONS_SETTINGS =
            "android.settings.MANAGE_ALL_APPLICATIONS_SETTINGS";

    /**
     * Activity Action: Show screen for controlling which apps can draw on top of other apps.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Optionally, the Intent's data URI can specify the application package name to
     * directly invoke the management GUI specific to the package name. For example
     * "package:com.my.app".
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MANAGE_OVERLAY_PERMISSION =
            "android.settings.action.MANAGE_OVERLAY_PERMISSION";

    /**
     * Activity Action: Show screen for controlling which apps are allowed to write/modify
     * system settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Optionally, the Intent's data URI can specify the application package name to
     * directly invoke the management GUI specific to the package name. For example
     * "package:com.my.app".
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MANAGE_WRITE_SETTINGS =
            "android.settings.action.MANAGE_WRITE_SETTINGS";

    /**
     * Activity Action: Show screen of details about a particular application.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: The Intent's data URI specifies the application package name
     * to be shown, with the "package" scheme.  That is "package:com.my.app".
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APPLICATION_DETAILS_SETTINGS =
            "android.settings.APPLICATION_DETAILS_SETTINGS";

    /**
     * Activity Action: Show the "Open by Default" page in a particular application's details page.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard against this.
     * <p>
     * Input: The Intent's data URI specifies the application package name
     * to be shown, with the "package" scheme. That is "package:com.my.app".
     * <p>
     * Output: Nothing.
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APPLICATION_DETAILS_SETTINGS_OPEN_BY_DEFAULT_PAGE =
            "android.settings.APPLICATION_DETAILS_SETTINGS_OPEN_BY_DEFAULT_PAGE";

    /**
     * Activity Action: Show list of applications that have been running
     * foreground services (to the user "running in the background").
     * <p>
     * Input: Extras "packages" is a string array of package names.
     * <p>
     * Output: Nothing.
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_FOREGROUND_SERVICES_SETTINGS =
            "android.settings.FOREGROUND_SERVICES_SETTINGS";

    /**
     * Activity Action: Show screen for controlling which apps can ignore battery optimizations.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * <p>
     * You can use {@link android.os.PowerManager#isIgnoringBatteryOptimizations
     * PowerManager.isIgnoringBatteryOptimizations()} to determine if an application is
     * already ignoring optimizations.  You can use
     * {@link #ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS} to ask the user to put you
     * on this list.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS =
            "android.settings.IGNORE_BATTERY_OPTIMIZATION_SETTINGS";

    /**
     * Activity Action: Ask the user to allow an app to ignore battery optimizations (that is,
     * put them on the whitelist of apps shown by
     * {@link #ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS}).  For an app to use this, it also
     * must hold the {@link android.Manifest.permission#REQUEST_IGNORE_BATTERY_OPTIMIZATIONS}
     * permission.
     * <p><b>Note:</b> most applications should <em>not</em> use this; there are many facilities
     * provided by the platform for applications to operate correctly in the various power
     * saving modes.  This is only for unusual applications that need to deeply control their own
     * execution, at the potential expense of the user's battery life.  Note that these applications
     * greatly run the risk of showing to the user as high power consumers on their device.</p>
     * <p>
     * Input: The Intent's data URI must specify the application package name
     * to be shown, with the "package" scheme.  That is "package:com.my.app".
     * <p>
     * Output: Nothing.
     * <p>
     * You can use {@link android.os.PowerManager#isIgnoringBatteryOptimizations
     * PowerManager.isIgnoringBatteryOptimizations()} to determine if an application is
     * already ignoring optimizations.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS =
            "android.settings.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS";

    /**
     * Activity Action: Show screen for controlling background data
     * restrictions for a particular application.
     * <p>
     * Input: Intent's data URI set with an application name, using the
     * "package" schema (like "package:com.my.app").
     *
     * <p>
     * Output: Nothing.
     * <p>
     * Applications can also use {@link android.net.ConnectivityManager#getRestrictBackgroundStatus
     * ConnectivityManager#getRestrictBackgroundStatus()} to determine the
     * status of the background data restrictions for them.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_IGNORE_BACKGROUND_DATA_RESTRICTIONS_SETTINGS =
            "android.settings.IGNORE_BACKGROUND_DATA_RESTRICTIONS_SETTINGS";

    /**
     * @hide
     * Activity Action: Show the "app ops" settings screen.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APP_OPS_SETTINGS =
            "android.settings.APP_OPS_SETTINGS";

    /**
     * Activity Action: Show settings for system update functionality.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SYSTEM_UPDATE_SETTINGS =
            "android.settings.SYSTEM_UPDATE_SETTINGS";

    /**
     * Activity Action: Show settings for managed profile settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MANAGED_PROFILE_SETTINGS =
            "android.settings.MANAGED_PROFILE_SETTINGS";

    /**
     * Activity Action: Show settings to allow configuration of sync settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * The account types available to add via the add account button may be restricted by adding an
     * {@link #EXTRA_AUTHORITIES} extra to this Intent with one or more syncable content provider's
     * authorities. Only account types which can sync with that content provider will be offered to
     * the user.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SYNC_SETTINGS =
            "android.settings.SYNC_SETTINGS";

    /**
     * Activity Action: Show add account screen for creating a new account.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * The account types available to add may be restricted by adding an {@link #EXTRA_AUTHORITIES}
     * extra to the Intent with one or more syncable content provider's authorities.  Only account
     * types which can sync with that content provider will be offered to the user.
     * <p>
     * Account types can also be filtered by adding an {@link #EXTRA_ACCOUNT_TYPES} extra to the
     * Intent with one or more account types.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ADD_ACCOUNT =
            "android.settings.ADD_ACCOUNT_SETTINGS";

    /**
     * Activity Action: Show settings for selecting the network operator.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * The subscription ID of the subscription for which available network operators should be
     * displayed may be optionally specified with {@link #EXTRA_SUB_ID}.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NETWORK_OPERATOR_SETTINGS =
            "android.settings.NETWORK_OPERATOR_SETTINGS";

    /**
     * Activity Action: Show settings for selection of 2G/3G.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_DATA_ROAMING_SETTINGS =
            "android.settings.DATA_ROAMING_SETTINGS";

    /**
     * Activity Action: Show settings for internal storage.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_INTERNAL_STORAGE_SETTINGS =
            "android.settings.INTERNAL_STORAGE_SETTINGS";
    /**
     * Activity Action: Show settings for memory card storage.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MEMORY_CARD_SETTINGS =
            "android.settings.MEMORY_CARD_SETTINGS";

    /**
     * Activity Action: Show settings for global search.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SEARCH_SETTINGS =
        "android.search.action.SEARCH_SETTINGS";

    /**
     * Activity Action: Show general device information settings (serial
     * number, software version, phone number, etc.).
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_DEVICE_INFO_SETTINGS =
        "android.settings.DEVICE_INFO_SETTINGS";

    /**
     * Activity Action: Show NFC settings.
     * <p>
     * This shows UI that allows NFC to be turned on or off.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing
     * @see android.nfc.NfcAdapter#isEnabled()
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NFC_SETTINGS = "android.settings.NFC_SETTINGS";

    /**
     * Activity Action: Show NFC Sharing settings.
     * <p>
     * This shows UI that allows NDEF Push (Android Beam) to be turned on or
     * off.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing
     * @see android.nfc.NfcAdapter#isNdefPushEnabled()
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NFCSHARING_SETTINGS =
        "android.settings.NFCSHARING_SETTINGS";

    /**
     * Activity Action: Show NFC Tap & Pay settings
     * <p>
     * This shows UI that allows the user to configure Tap&Pay
     * settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NFC_PAYMENT_SETTINGS =
        "android.settings.NFC_PAYMENT_SETTINGS";

    /**
     * Activity Action: Show Daydream settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * @see android.service.dreams.DreamService
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_DREAM_SETTINGS = "android.settings.DREAM_SETTINGS";

    /**
     * Activity Action: Show Notification listener settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * @see android.service.notification.NotificationListenerService
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NOTIFICATION_LISTENER_SETTINGS
            = "android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS";

    /**
     * Activity Action: Show Do Not Disturb access settings.
     * <p>
     * Users can grant and deny access to Do Not Disturb configuration from here.
     * See {@link android.app.NotificationManager#isNotificationPolicyAccessGranted()} for more
     * details.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS
            = "android.settings.NOTIFICATION_POLICY_ACCESS_SETTINGS";

    /**
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_CONDITION_PROVIDER_SETTINGS
            = "android.settings.ACTION_CONDITION_PROVIDER_SETTINGS";

    /**
     * Activity Action: Show settings for video captioning.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard
     * against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_CAPTIONING_SETTINGS = "android.settings.CAPTIONING_SETTINGS";

    /**
     * Activity Action: Show the top level print settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_PRINT_SETTINGS =
            "android.settings.ACTION_PRINT_SETTINGS";

    /**
     * Activity Action: Show Zen Mode configuration settings.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ZEN_MODE_SETTINGS = "android.settings.ZEN_MODE_SETTINGS";

    /**
     * Activity Action: Show Zen Mode (aka Do Not Disturb) priority configuration settings.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ZEN_MODE_PRIORITY_SETTINGS
            = "android.settings.ZEN_MODE_PRIORITY_SETTINGS";

    /**
     * Activity Action: Show Zen Mode automation configuration settings.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ZEN_MODE_AUTOMATION_SETTINGS
            = "android.settings.ZEN_MODE_AUTOMATION_SETTINGS";

    /**
     * Activity Action: Modify do not disturb mode settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard against this.
     * <p>
     * This intent MUST be started using
     * {@link android.service.voice.VoiceInteractionSession#startVoiceActivity
     * startVoiceActivity}.
     * <p>
     * Note: The Activity implementing this intent MUST verify that
     * {@link android.app.Activity#isVoiceInteraction isVoiceInteraction}.
     * returns true before modifying the setting.
     * <p>
     * Input: The optional {@link #EXTRA_DO_NOT_DISTURB_MODE_MINUTES} extra can be used to indicate
     * how long the user wishes to avoid interruptions for. The optional
     * {@link #EXTRA_DO_NOT_DISTURB_MODE_ENABLED} extra can be to indicate if the user is
     * enabling or disabling do not disturb mode. If either extra is not included, the
     * user maybe asked to provide the value.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_VOICE_CONTROL_DO_NOT_DISTURB_MODE =
            "android.settings.VOICE_CONTROL_DO_NOT_DISTURB_MODE";

    /**
     * Activity Action: Show Zen Mode schedule rule configuration settings.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ZEN_MODE_SCHEDULE_RULE_SETTINGS
            = "android.settings.ZEN_MODE_SCHEDULE_RULE_SETTINGS";

    /**
     * Activity Action: Show Zen Mode event rule configuration settings.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ZEN_MODE_EVENT_RULE_SETTINGS
            = "android.settings.ZEN_MODE_EVENT_RULE_SETTINGS";

    /**
     * Activity Action: Show Zen Mode external rule configuration settings.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ZEN_MODE_EXTERNAL_RULE_SETTINGS
            = "android.settings.ZEN_MODE_EXTERNAL_RULE_SETTINGS";

    /**
     * Activity Action: Show the regulatory information screen for the device.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard
     * against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String
            ACTION_SHOW_REGULATORY_INFO = "android.settings.SHOW_REGULATORY_INFO";

    /**
     * Activity Action: Show Device Name Settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard
     * against this.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String DEVICE_NAME_SETTINGS = "android.settings.DEVICE_NAME";

    /**
     * Activity Action: Show pairing settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard
     * against this.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_PAIRING_SETTINGS = "android.settings.PAIRING_SETTINGS";

    /**
     * Activity Action: Show battery saver settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard
     * against this.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_BATTERY_SAVER_SETTINGS
            = "android.settings.BATTERY_SAVER_SETTINGS";

    /**
     * Activity Action: Modify Battery Saver mode setting using a voice command.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you safeguard against this.
     * <p>
     * This intent MUST be started using
     * {@link android.service.voice.VoiceInteractionSession#startVoiceActivity
     * startVoiceActivity}.
     * <p>
     * Note: The activity implementing this intent MUST verify that
     * {@link android.app.Activity#isVoiceInteraction isVoiceInteraction} returns true before
     * modifying the setting.
     * <p>
     * Input: To tell which state batter saver mode should be set to, add the
     * {@link #EXTRA_BATTERY_SAVER_MODE_ENABLED} extra to this Intent with the state specified.
     * If the extra is not included, no changes will be made.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_VOICE_CONTROL_BATTERY_SAVER_MODE =
            "android.settings.VOICE_CONTROL_BATTERY_SAVER_MODE";

    /**
     * Activity Action: Show Home selection settings. If there are multiple activities
     * that can satisfy the {@link Intent#CATEGORY_HOME} intent, this screen allows you
     * to pick your preferred activity.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_HOME_SETTINGS
            = "android.settings.HOME_SETTINGS";

    /**
     * Activity Action: Show Default apps settings.
     * <p>
     * In some cases, a matching Activity may not exist, so ensure you
     * safeguard against this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_MANAGE_DEFAULT_APPS_SETTINGS
            = "android.settings.MANAGE_DEFAULT_APPS_SETTINGS";

    /**
     * Activity Action: Show notification settings.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_NOTIFICATION_SETTINGS
            = "android.settings.NOTIFICATION_SETTINGS";

    /**
     * Activity Action: Show app listing settings, filtered by those that send notifications.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ALL_APPS_NOTIFICATION_SETTINGS =
            "android.settings.ALL_APPS_NOTIFICATION_SETTINGS";

    /**
     * Activity Action: Show notification settings for a single app.
     * <p>
     *     Input: {@link #EXTRA_APP_PACKAGE}, the package to display.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APP_NOTIFICATION_SETTINGS
            = "android.settings.APP_NOTIFICATION_SETTINGS";

    /**
     * Activity Action: Show notification settings for a single {@link NotificationChannel}.
     * <p>
     *     Input: {@link #EXTRA_APP_PACKAGE}, the package containing the channel to display.
     *     Input: {@link #EXTRA_CHANNEL_ID}, the id of the channel to display.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_CHANNEL_NOTIFICATION_SETTINGS
            = "android.settings.CHANNEL_NOTIFICATION_SETTINGS";

    /**
     * Activity Extra: The package owner of the notification channel settings to display.
     * <p>
     * This must be passed as an extra field to the {@link #ACTION_CHANNEL_NOTIFICATION_SETTINGS}.
     */
    public static final String EXTRA_APP_PACKAGE = "android.provider.extra.APP_PACKAGE";

    /**
     * Activity Extra: The {@link NotificationChannel#getId()} of the notification channel settings
     * to display.
     * <p>
     * This must be passed as an extra field to the {@link #ACTION_CHANNEL_NOTIFICATION_SETTINGS}.
     */
    public static final String EXTRA_CHANNEL_ID = "android.provider.extra.CHANNEL_ID";

    /**
     * Activity Action: Show notification redaction settings.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_APP_NOTIFICATION_REDACTION
            = "android.settings.ACTION_APP_NOTIFICATION_REDACTION";

    /** @hide */ public static final String EXTRA_APP_UID = "app_uid";

    /**
     * Activity Action: Show a dialog with disabled by policy message.
     * <p> If an user action is disabled by policy, this dialog can be triggered to let
     * the user know about this.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SHOW_ADMIN_SUPPORT_DETAILS
            = "android.settings.SHOW_ADMIN_SUPPORT_DETAILS";

    /**
     * Activity Action: Show a dialog for remote bugreport flow.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_SHOW_REMOTE_BUGREPORT_DIALOG
            = "android.settings.SHOW_REMOTE_BUGREPORT_DIALOG";

    /**
     * Activity Action: Show VR listener settings.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     *
     * @see android.service.vr.VrListenerService
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_VR_LISTENER_SETTINGS
            = "android.settings.VR_LISTENER_SETTINGS";

    /**
     * Activity Action: Show Picture-in-picture settings.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_PICTURE_IN_PICTURE_SETTINGS
            = "android.settings.PICTURE_IN_PICTURE_SETTINGS";

    /**
     * Activity Action: Show Storage Manager settings.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     *
     * @hide
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_STORAGE_MANAGER_SETTINGS
            = "android.settings.STORAGE_MANAGER_SETTINGS";

    /**
     * Activity Action: Allows user to select current webview implementation.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_WEBVIEW_SETTINGS = "android.settings.WEBVIEW_SETTINGS";

    /**
     * Activity Action: Show enterprise privacy section.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * @hide
     */
    @SystemApi
    @TestApi
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_ENTERPRISE_PRIVACY_SETTINGS
            = "android.settings.ENTERPRISE_PRIVACY_SETTINGS";

    /**
     * Activity Action: Show screen that let user select its Autofill Service.
     * <p>
     * Input: Intent's data URI set with an application name, using the
     * "package" schema (like "package:com.my.app").
     *
     * <p>
     * Output: {@link android.app.Activity#RESULT_OK} if user selected an Autofill Service belonging
     * to the caller package.
     *
     * <p>
     * <b>NOTE: </b> Applications should call
     * {@link android.view.autofill.AutofillManager#hasEnabledAutofillServices()} and
     * {@link android.view.autofill.AutofillManager#isAutofillSupported()}, and only use this action
     * to start an activity if they return {@code false} and {@code true} respectively.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_REQUEST_SET_AUTOFILL_SERVICE =
            "android.settings.REQUEST_SET_AUTOFILL_SERVICE";

    /**
     * Activity Action: Show screen for controlling which apps have access on volume directories.
     * <p>
     * Input: Nothing.
     * <p>
     * Output: Nothing.
     * <p>
     * Applications typically use this action to ask the user to revert the "Do not ask again"
     * status of directory access requests made by
     * {@link android.os.storage.StorageVolume#createAccessIntent(String)}.
     */
    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
    public static final String ACTION_STORAGE_VOLUME_ACCESS_SETTINGS =
            "android.settings.STORAGE_VOLUME_ACCESS_SETTINGS";

    // End of Intent actions for Settings

    /**
     * @hide - Private call() method on SettingsProvider to read from 'system' table.
     */
    public static final String CALL_METHOD_GET_SYSTEM = "GET_system";

    /**
     * @hide - Private call() method on SettingsProvider to read from 'secure' table.
     */
    public static final String CALL_METHOD_GET_SECURE = "GET_secure";

    /**
     * @hide - Private call() method on SettingsProvider to read from 'global' table.
     */
    public static final String CALL_METHOD_GET_GLOBAL = "GET_global";

    /**
     * @hide - Specifies that the caller of the fast-path call()-based flow tracks
     * the settings generation in order to cache values locally. If this key is
     * mapped to a <code>null</code> string extra in the request bundle, the response
     * bundle will contain the same key mapped to a parcelable extra which would be
     * an {@link android.util.MemoryIntArray}. The response will also contain an
     * integer mapped to the {@link #CALL_METHOD_GENERATION_INDEX_KEY} which is the
     * index in the array clients should use to lookup the generation. For efficiency
     * the caller should request the generation tracking memory array only if it
     * doesn't already have it.
     *
     * @see #CALL_METHOD_GENERATION_INDEX_KEY
     */
    public static final String CALL_METHOD_TRACK_GENERATION_KEY = "_track_generation";

    /**
     * @hide Key with the location in the {@link android.util.MemoryIntArray} where
     * to look up the generation id of the backing table. The value is an integer.
     *
     * @see #CALL_METHOD_TRACK_GENERATION_KEY
     */
    public static final String CALL_METHOD_GENERATION_INDEX_KEY = "_generation_index";

    /**
     * @hide Key with the settings table generation. The value is an integer.
     *
     * @see #CALL_METHOD_TRACK_GENERATION_KEY
     */
    public static final String CALL_METHOD_GENERATION_KEY = "_generation";

    /**
     * @hide - User handle argument extra to the fast-path call()-based requests
     */
    public static final String CALL_METHOD_USER_KEY = "_user";

    /**
     * @hide - Boolean argument extra to the fast-path call()-based requests
     */
    public static final String CALL_METHOD_MAKE_DEFAULT_KEY = "_make_default";

    /**
     * @hide - User handle argument extra to the fast-path call()-based requests
     */
    public static final String CALL_METHOD_RESET_MODE_KEY = "_reset_mode";

    /**
     * @hide - String argument extra to the fast-path call()-based requests
     */
    public static final String CALL_METHOD_TAG_KEY = "_tag";

    /** @hide - Private call() method to write to 'system' table */
    public static final String CALL_METHOD_PUT_SYSTEM = "PUT_system";

    /** @hide - Private call() method to write to 'secure' table */
    public static final String CALL_METHOD_PUT_SECURE = "PUT_secure";

    /** @hide - Private call() method to write to 'global' table */
    public static final String CALL_METHOD_PUT_GLOBAL= "PUT_global";

    /** @hide - Private call() method to reset to defaults the 'global' table */
    public static final String CALL_METHOD_RESET_GLOBAL = "RESET_global";

    /** @hide - Private call() method to reset to defaults the 'secure' table */
    public static final String CALL_METHOD_RESET_SECURE = "RESET_secure";

    /**
     * Activity Extra: Limit available options in launched activity based on the given authority.
     * <p>
     * This can be passed as an extra field in an Activity Intent with one or more syncable content
     * provider's authorities as a String[]. This field is used by some intents to alter the
     * behavior of the called activity.
     * <p>
     * Example: The {@link #ACTION_ADD_ACCOUNT} intent restricts the account types available based
     * on the authority given.
     */
    public static final String EXTRA_AUTHORITIES = "authorities";

    /**
     * Activity Extra: Limit available options in launched activity based on the given account
     * types.
     * <p>
     * This can be passed as an extra field in an Activity Intent with one or more account types
     * as a String[]. This field is used by some intents to alter the behavior of the called
     * activity.
     * <p>
     * Example: The {@link #ACTION_ADD_ACCOUNT} intent restricts the account types to the specified
     * list.
     */
    public static final String EXTRA_ACCOUNT_TYPES = "account_types";

    public static final String EXTRA_INPUT_METHOD_ID = "input_method_id";

    /**
     * Activity Extra: The device identifier to act upon.
     * <p>
     * This can be passed as an extra field in an Activity Intent with a single
     * InputDeviceIdentifier. This field is used by some activities to jump straight into the
     * settings for the given device.
     * <p>
     * Example: The {@link #ACTION_INPUT_METHOD_SETTINGS} intent opens the keyboard layout
     * dialog for the given device.
     * @hide
     */
    public static final String EXTRA_INPUT_DEVICE_IDENTIFIER = "input_device_identifier";

    /**
     * Activity Extra: Enable or disable Airplane Mode.
     * <p>
     * This can be passed as an extra field to the {@link #ACTION_VOICE_CONTROL_AIRPLANE_MODE}
     * intent as a boolean to indicate if it should be enabled.
     */
    public static final String EXTRA_AIRPLANE_MODE_ENABLED = "airplane_mode_enabled";

    /**
     * Activity Extra: Enable or disable Battery saver mode.
     * <p>
     * This can be passed as an extra field to the {@link #ACTION_VOICE_CONTROL_BATTERY_SAVER_MODE}
     * intent as a boolean to indicate if it should be enabled.
     */
    public static final String EXTRA_BATTERY_SAVER_MODE_ENABLED =
            "android.settings.extra.battery_saver_mode_enabled";

    /**
     * Activity Extra: Enable or disable Do Not Disturb mode.
     * <p>
     * This can be passed as an extra field to the {@link #ACTION_VOICE_CONTROL_DO_NOT_DISTURB_MODE}
     * intent as a boolean to indicate if it should be enabled.
     */
    public static final String EXTRA_DO_NOT_DISTURB_MODE_ENABLED =
            "android.settings.extra.do_not_disturb_mode_enabled";

    /**
     * Activity Extra: How many minutes to enable do not disturb mode for.
     * <p>
     * This can be passed as an extra field to the {@link #ACTION_VOICE_CONTROL_DO_NOT_DISTURB_MODE}
     * intent to indicate how long do not disturb mode should be enabled for.
     */
    public static final String EXTRA_DO_NOT_DISTURB_MODE_MINUTES =
            "android.settings.extra.do_not_disturb_mode_minutes";

    /**
     * Reset mode: reset to defaults only settings changed by the
     * calling package. If there is a default set the setting
     * will be set to it, otherwise the setting will be deleted.
     * This is the only type of reset available to non-system clients.
     * @hide
     */
    public static final int RESET_MODE_PACKAGE_DEFAULTS = 1;

    /**
     * Reset mode: reset all settings set by untrusted packages, which is
     * packages that aren't a part of the system, to the current defaults.
     * If there is a default set the setting will be set to it, otherwise
     * the setting will be deleted. This mode is only available to the system.
     * @hide
     */
    public static final int RESET_MODE_UNTRUSTED_DEFAULTS = 2;

    /**
     * Reset mode: delete all settings set by untrusted packages, which is
     * packages that aren't a part of the system. If a setting is set by an
     * untrusted package it will be deleted if its default is not provided
     * by the system, otherwise the setting will be set to its default.
     * This mode is only available to the system.
     * @hide
     */
    public static final int RESET_MODE_UNTRUSTED_CHANGES = 3;

    /**
     * Reset mode: reset all settings to defaults specified by trusted
     * packages, which is packages that are a part of the system, and
     * delete all settings set by untrusted packages. If a setting has
     * a default set by a system package it will be set to the default,
     * otherwise the setting will be deleted. This mode is only available
     * to the system.
     * @hide
     */
    public static final int RESET_MODE_TRUSTED_DEFAULTS = 4;

    /** @hide */
    @Retention(RetentionPolicy.SOURCE)
    @IntDef(prefix = { "RESET_MODE_" }, value = {
            RESET_MODE_PACKAGE_DEFAULTS,
            RESET_MODE_UNTRUSTED_DEFAULTS,
            RESET_MODE_UNTRUSTED_CHANGES,
            RESET_MODE_TRUSTED_DEFAULTS
    })
    public @interface ResetMode{}


    /**
     * User has not started setup personalization.
     * @hide
     */
    public static final int USER_SETUP_PERSONALIZATION_NOT_STARTED = 0;

    /**
     * User has not yet completed setup personalization.
     * @hide
     */
    public static final int USER_SETUP_PERSONALIZATION_STARTED = 1;

    /**
     * User has completed setup personalization.
     * @hide
     */
    public static final int USER_SETUP_PERSONALIZATION_COMPLETE = 10;

    /** @hide */
    @Retention(RetentionPolicy.SOURCE)
    @IntDef({
            USER_SETUP_PERSONALIZATION_NOT_STARTED,
            USER_SETUP_PERSONALIZATION_STARTED,
            USER_SETUP_PERSONALIZATION_COMPLETE
    })
    public @interface UserSetupPersonalization {}

    /**
     * Activity Extra: Number of certificates
     * <p>
     * This can be passed as an extra field to the {@link #ACTION_MONITORING_CERT_INFO}
     * intent to indicate the number of certificates
     * @hide
     */
    public static final String EXTRA_NUMBER_OF_CERTIFICATES =
            "android.settings.extra.number_of_certificates";

    private static final String JID_RESOURCE_PREFIX = "android";

    public static final String AUTHORITY = "settings";

    private static final String TAG = "Settings";
    private static final boolean LOCAL_LOGV = false;

    // Lock ensures that when enabling/disabling the master location switch, we don't end up
    // with a partial enable/disable state in multi-threaded situations.
    private static final Object mLocationSettingsLock = new Object();

    // Used in system server calling uid workaround in call()
    private static boolean sInSystemServer = false;
    private static final Object sInSystemServerLock = new Object();

    /** @hide */
    public static void setInSystemServer() {
        synchronized (sInSystemServerLock) {
            sInSystemServer = true;
        }
    }

    /** @hide */
    public static boolean isInSystemServer() {
        synchronized (sInSystemServerLock) {
            return sInSystemServer;
        }
    }

    public static class SettingNotFoundException extends AndroidException {
        public SettingNotFoundException(String msg) {
            super(msg);
        }
    }

    /**
     * Common base for tables of name/value settings.
     */
    public static class NameValueTable implements BaseColumns {
        public static final String NAME = "name";
        public static final String VALUE = "value";

        protected static boolean putString(ContentResolver resolver, Uri uri,
                String name, String value) {
            // The database will take care of replacing duplicates.
            try {
                ContentValues values = new ContentValues();
                values.put(NAME, name);
                values.put(VALUE, value);
                resolver.insert(uri, values);
                return true;
            } catch (SQLException e) {
                Log.w(TAG, "Can't set key " + name + " in " + uri, e);
                return false;
            }
        }

        public static Uri getUriFor(Uri uri, String name) {
            return Uri.withAppendedPath(uri, name);
        }
    }

    private static final class GenerationTracker {
        private final MemoryIntArray mArray;
        private final Runnable mErrorHandler;
        private final int mIndex;
        private int mCurrentGeneration;

        public GenerationTracker(@NonNull MemoryIntArray array, int index,
                int generation, Runnable errorHandler) {
            mArray = array;
            mIndex = index;
            mErrorHandler = errorHandler;
            mCurrentGeneration = generation;
        }

        public boolean isGenerationChanged() {
            final int currentGeneration = readCurrentGeneration();
            if (currentGeneration >= 0) {
                if (currentGeneration == mCurrentGeneration) {
                    return false;
                }
                mCurrentGeneration = currentGeneration;
            }
            return true;
        }

        public int getCurrentGeneration() {
            return mCurrentGeneration;
        }

        private int readCurrentGeneration() {
            try {
                return mArray.get(mIndex);
            } catch (IOException e) {
                Log.e(TAG, "Error getting current generation", e);
                if (mErrorHandler != null) {
                    mErrorHandler.run();
                }
            }
            return -1;
        }

        public void destroy() {
            try {
                mArray.close();
            } catch (IOException e) {
                Log.e(TAG, "Error closing backing array", e);
                if (mErrorHandler != null) {
                    mErrorHandler.run();
                }
            }
        }
    }

    private static final class ContentProviderHolder {
        private final Object mLock = new Object();

        @GuardedBy("mLock")
        private final Uri mUri;
        @GuardedBy("mLock")
        private IContentProvider mContentProvider;

        public ContentProviderHolder(Uri uri) {
            mUri = uri;
        }

        public IContentProvider getProvider(ContentResolver contentResolver) {
            synchronized (mLock) {
                if (mContentProvider == null) {
                    mContentProvider = contentResolver
                            .acquireProvider(mUri.getAuthority());
                }
                return mContentProvider;
            }
        }

        public void clearProviderForTest() {
            synchronized (mLock) {
                mContentProvider = null;
            }
        }
    }

    // Thread-safe.
    private static class NameValueCache {
        private static final boolean DEBUG = false;

        private static final String[] SELECT_VALUE_PROJECTION = new String[] {
                Settings.NameValueTable.VALUE
        };

        private static final String NAME_EQ_PLACEHOLDER = "name=?";

        // Must synchronize on 'this' to access mValues and mValuesVersion.
        private final HashMap<String, String> mValues = new HashMap<>();

        private final Uri mUri;
        private final ContentProviderHolder mProviderHolder;

        // The method we'll call (or null, to not use) on the provider
        // for the fast path of retrieving settings.
        private final String mCallGetCommand;
        private final String mCallSetCommand;

        @GuardedBy("this")
        private GenerationTracker mGenerationTracker;

        public NameValueCache(Uri uri, String getCommand, String setCommand,
                ContentProviderHolder providerHolder) {
            mUri = uri;
            mCallGetCommand = getCommand;
            mCallSetCommand = setCommand;
            mProviderHolder = providerHolder;
        }

        public boolean putStringForUser(ContentResolver cr, String name, String value,
                String tag, boolean makeDefault, final int userHandle) {
            try {
                Bundle arg = new Bundle();
                arg.putString(Settings.NameValueTable.VALUE, value);
                arg.putInt(CALL_METHOD_USER_KEY, userHandle);
                if (tag != null) {
                    arg.putString(CALL_METHOD_TAG_KEY, tag);
                }
                if (makeDefault) {
                    arg.putBoolean(CALL_METHOD_MAKE_DEFAULT_KEY, true);
                }
                IContentProvider cp = mProviderHolder.getProvider(cr);
                cp.call(cr.getPackageName(), mCallSetCommand, name, arg);
            } catch (RemoteException e) {
                Log.w(TAG, "Can't set key " + name + " in " + mUri, e);
                return false;
            }
            return true;
        }

        public String getStringForUser(ContentResolver cr, String name, final int userHandle) {
            final boolean isSelf = (userHandle == UserHandle.myUserId());
            int currentGeneration = -1;
            if (isSelf) {
                synchronized (NameValueCache.this) {
                    if (mGenerationTracker != null) {
                        if (mGenerationTracker.isGenerationChanged()) {
                            if (DEBUG) {
                                Log.i(TAG, "Generation changed for type:"
                                        + mUri.getPath() + " in package:"
                                        + cr.getPackageName() +" and user:" + userHandle);
                            }
                            mValues.clear();
                        } else if (mValues.containsKey(name)) {
                            return mValues.get(name);
                        }
                        if (mGenerationTracker != null) {
                            currentGeneration = mGenerationTracker.getCurrentGeneration();
                        }
                    }
                }
            } else {
                if (LOCAL_LOGV) Log.v(TAG, "get setting for user " + userHandle
                        + " by user " + UserHandle.myUserId() + " so skipping cache");
            }

            IContentProvider cp = mProviderHolder.getProvider(cr);

            // Try the fast path first, not using query().  If this
            // fails (alternate Settings provider that doesn't support
            // this interface?) then we fall back to the query/table
            // interface.
            if (mCallGetCommand != null) {
                try {
                    Bundle args = null;
                    if (!isSelf) {
                        args = new Bundle();
                        args.putInt(CALL_METHOD_USER_KEY, userHandle);
                    }
                    boolean needsGenerationTracker = false;
                    synchronized (NameValueCache.this) {
                        if (isSelf && mGenerationTracker == null) {
                            needsGenerationTracker = true;
                            if (args == null) {
                                args = new Bundle();
                            }
                            args.putString(CALL_METHOD_TRACK_GENERATION_KEY, null);
                            if (DEBUG) {
                                Log.i(TAG, "Requested generation tracker for type: "+ mUri.getPath()
                                        + " in package:" + cr.getPackageName() +" and user:"
                                        + userHandle);
                            }
                        }
                    }
                    Bundle b;
                    // If we're in system server and in a binder transaction we need to clear the
                    // calling uid. This works around code in system server that did not call
                    // clearCallingIdentity, previously this wasn't needed because reading settings
                    // did not do permission checking but thats no longer the case.
                    // Long term this should be removed and callers should properly call
                    // clearCallingIdentity or use a ContentResolver from the caller as needed.
                    if (Settings.isInSystemServer() && Binder.getCallingUid() != Process.myUid()) {
                        final long token = Binder.clearCallingIdentity();
                        try {
                            b = cp.call(cr.getPackageName(), mCallGetCommand, name, args);
                        } finally {
                            Binder.restoreCallingIdentity(token);
                        }
                    } else {
                        b = cp.call(cr.getPackageName(), mCallGetCommand, name, args);
                    }
                    if (b != null) {
                        String value = b.getString(Settings.NameValueTable.VALUE);
                        // Don't update our cache for reads of other users' data
                        if (isSelf) {
                            synchronized (NameValueCache.this) {
                                if (needsGenerationTracker) {
                                    MemoryIntArray array = b.getParcelable(
                                            CALL_METHOD_TRACK_GENERATION_KEY);
                                    final int index = b.getInt(
                                            CALL_METHOD_GENERATION_INDEX_KEY, -1);
                                    if (array != null && index >= 0) {
                                        final int generation = b.getInt(
                                                CALL_METHOD_GENERATION_KEY, 0);
                                        if (DEBUG) {
                                            Log.i(TAG, "Received generation tracker for type:"
                                                    + mUri.getPath() + " in package:"
                                                    + cr.getPackageName() + " and user:"
                                                    + userHandle + " with index:" + index);
                                        }
                                        if (mGenerationTracker != null) {
                                            mGenerationTracker.destroy();
                                        }
                                        mGenerationTracker = new GenerationTracker(array, index,
                                                generation, () -> {
                                            synchronized (NameValueCache.this) {
                                                Log.e(TAG, "Error accessing generation"
                                                        + " tracker - removing");
                                                if (mGenerationTracker != null) {
                                                    GenerationTracker generationTracker =
                                                            mGenerationTracker;
                                                    mGenerationTracker = null;
                                                    generationTracker.destroy();
                                                    mValues.clear();
                                                }
                                            }
                                        });
                                    }
                                }
                                if (mGenerationTracker != null && currentGeneration ==
                                        mGenerationTracker.getCurrentGeneration()) {
                                    mValues.put(name, value);
                                }
                            }
                        } else {
                            if (LOCAL_LOGV) Log.i(TAG, "call-query of user " + userHandle
                                    + " by " + UserHandle.myUserId()
                                    + " so not updating cache");
                        }
                        return value;
                    }
                    // If the response Bundle is null, we fall through
                    // to the query interface below.
                } catch (RemoteException e) {
                    // Not supported by the remote side?  Fall through
                    // to query().
                }
            }

            Cursor c = null;
            try {
                Bundle queryArgs = ContentResolver.createSqlQueryBundle(
                        NAME_EQ_PLACEHOLDER, new String[]{name}, null);
                // Same workaround as above.
                if (Settings.isInSystemServer() && Binder.getCallingUid() != Process.myUid()) {
                    final long token = Binder.clearCallingIdentity();
                    try {
                        c = cp.query(cr.getPackageName(), mUri, SELECT_VALUE_PROJECTION, queryArgs,
                                null);
                    } finally {
                        Binder.restoreCallingIdentity(token);
                    }
                } else {
                    c = cp.query(cr.getPackageName(), mUri, SELECT_VALUE_PROJECTION, queryArgs,
                            null);
                }
                if (c == null) {
                    Log.w(TAG, "Can't get key " + name + " from " + mUri);
                    return null;
                }

                String value = c.moveToNext() ? c.getString(0) : null;
                synchronized (NameValueCache.this) {
                    if(mGenerationTracker != null &&
                            currentGeneration == mGenerationTracker.getCurrentGeneration()) {
                        mValues.put(name, value);
                    }
                }
                if (LOCAL_LOGV) {
                    Log.v(TAG, "cache miss [" + mUri.getLastPathSegment() + "]: " +
                            name + " = " + (value == null ? "(null)" : value));
                }
                return value;
            } catch (RemoteException e) {
                Log.w(TAG, "Can't get key " + name + " from " + mUri, e);
                return null;  // Return null, but don't cache it.
            } finally {
                if (c != null) c.close();
            }
        }

        public void clearGenerationTrackerForTest() {
            synchronized (NameValueCache.this) {
                if (mGenerationTracker != null) {
                    mGenerationTracker.destroy();
                }
                mValues.clear();
                mGenerationTracker = null;
            }
        }
    }

    /**
     * Checks if the specified context can draw on top of other apps. As of API
     * level 23, an app cannot draw on top of other apps unless it declares the
     * {@link android.Manifest.permission#SYSTEM_ALERT_WINDOW} permission in its
     * manifest, <em>and</em> the user specifically grants the app this
     * capability. To prompt the user to grant this approval, the app must send an
     * intent with the action
     * {@link android.provider.Settings#ACTION_MANAGE_OVERLAY_PERMISSION}, which
     * causes the system to display a permission management screen.
     *
     * @param context App context.
     * @return true if the specified context can draw on top of other apps, false otherwise
     */
    public static boolean canDrawOverlays(Context context) {
        return Settings.isCallingPackageAllowedToDrawOverlays(context, Process.myUid(),
                context.getOpPackageName(), false);
    }

    /**
     * System settings, containing miscellaneous system preferences.  This
     * table holds simple name/value pairs.  There are convenience
     * functions for accessing individual settings entries.
     */
    public static final class System extends NameValueTable {
        // NOTE: If you add new settings here, be sure to add them to
        // com.android.providers.settings.SettingsProtoDumpUtil#dumpProtoSystemSettingsLocked.

        private static final float DEFAULT_FONT_SCALE = 1.0f;

        /**
         * The content:// style URL for this table
         */
        public static final Uri CONTENT_URI =
            Uri.parse("content://" + AUTHORITY + "/system");

        private static final ContentProviderHolder sProviderHolder =
                new ContentProviderHolder(CONTENT_URI);

        private static final NameValueCache sNameValueCache = new NameValueCache(
                CONTENT_URI,
                CALL_METHOD_GET_SYSTEM,
                CALL_METHOD_PUT_SYSTEM,
                sProviderHolder);

        private static final HashSet<String> MOVED_TO_SECURE;
        static {
            MOVED_TO_SECURE = new HashSet<>(30);
            MOVED_TO_SECURE.add(Secure.ANDROID_ID);
            MOVED_TO_SECURE.add(Secure.HTTP_PROXY);
            MOVED_TO_SECURE.add(Secure.LOCATION_PROVIDERS_ALLOWED);
            MOVED_TO_SECURE.add(Secure.LOCK_BIOMETRIC_WEAK_FLAGS);
            MOVED_TO_SECURE.add(Secure.LOCK_PATTERN_ENABLED);
            MOVED_TO_SECURE.add(Secure.LOCK_PATTERN_VISIBLE);
            MOVED_TO_SECURE.add(Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED);
            MOVED_TO_SECURE.add(Secure.LOGGING_ID);
            MOVED_TO_SECURE.add(Secure.PARENTAL_CONTROL_ENABLED);
            MOVED_TO_SECURE.add(Secure.PARENTAL_CONTROL_LAST_UPDATE);
            MOVED_TO_SECURE.add(Secure.PARENTAL_CONTROL_REDIRECT_URL);
            MOVED_TO_SECURE.add(Secure.SETTINGS_CLASSNAME);
            MOVED_TO_SECURE.add(Secure.USE_GOOGLE_MAIL);
            MOVED_TO_SECURE.add(Secure.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON);
            MOVED_TO_SECURE.add(Secure.WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY);
            MOVED_TO_SECURE.add(Secure.WIFI_NUM_OPEN_NETWORKS_KEPT);
            MOVED_TO_SECURE.add(Secure.WIFI_ON);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_ACCEPTABLE_PACKET_LOSS_PERCENTAGE);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_AP_COUNT);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_BACKGROUND_CHECK_DELAY_MS);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_BACKGROUND_CHECK_TIMEOUT_MS);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_INITIAL_IGNORED_PING_COUNT);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_MAX_AP_CHECKS);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_ON);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_PING_COUNT);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_PING_DELAY_MS);
            MOVED_TO_SECURE.add(Secure.WIFI_WATCHDOG_PING_TIMEOUT_MS);

            // At one time in System, then Global, but now back in Secure
            MOVED_TO_SECURE.add(Secure.INSTALL_NON_MARKET_APPS);
        }

        private static final HashSet<String> MOVED_TO_GLOBAL;
        private static final HashSet<String> MOVED_TO_SECURE_THEN_GLOBAL;
        static {
            MOVED_TO_GLOBAL = new HashSet<>();
            MOVED_TO_SECURE_THEN_GLOBAL = new HashSet<>();

            // these were originally in system but migrated to secure in the past,
            // so are duplicated in the Secure.* namespace
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.ADB_ENABLED);
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.BLUETOOTH_ON);
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.DATA_ROAMING);
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.DEVICE_PROVISIONED);
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.USB_MASS_STORAGE_ENABLED);
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.HTTP_PROXY);

            // these are moving directly from system to global
            MOVED_TO_GLOBAL.add(Settings.Global.AIRPLANE_MODE_ON);
            MOVED_TO_GLOBAL.add(Settings.Global.AIRPLANE_MODE_RADIOS);
            MOVED_TO_GLOBAL.add(Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
            MOVED_TO_GLOBAL.add(Settings.Global.AUTO_TIME);
            MOVED_TO_GLOBAL.add(Settings.Global.AUTO_TIME_ZONE);
            MOVED_TO_GLOBAL.add(Settings.Global.CAR_DOCK_SOUND);
            MOVED_TO_GLOBAL.add(Settings.Global.CAR_UNDOCK_SOUND);
            MOVED_TO_GLOBAL.add(Settings.Global.DESK_DOCK_SOUND);
            MOVED_TO_GLOBAL.add(Settings.Global.DESK_UNDOCK_SOUND);
            MOVED_TO_GLOBAL.add(Settings.Global.DOCK_SOUNDS_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.LOCK_SOUND);
            MOVED_TO_GLOBAL.add(Settings.Global.UNLOCK_SOUND);
            MOVED_TO_GLOBAL.add(Settings.Global.LOW_BATTERY_SOUND);
            MOVED_TO_GLOBAL.add(Settings.Global.POWER_SOUNDS_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.STAY_ON_WHILE_PLUGGED_IN);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_SLEEP_POLICY);
            MOVED_TO_GLOBAL.add(Settings.Global.MODE_RINGER);
            MOVED_TO_GLOBAL.add(Settings.Global.WINDOW_ANIMATION_SCALE);
            MOVED_TO_GLOBAL.add(Settings.Global.TRANSITION_ANIMATION_SCALE);
            MOVED_TO_GLOBAL.add(Settings.Global.ANIMATOR_DURATION_SCALE);
            MOVED_TO_GLOBAL.add(Settings.Global.FANCY_IME_ANIMATIONS);
            MOVED_TO_GLOBAL.add(Settings.Global.COMPATIBILITY_MODE);
            MOVED_TO_GLOBAL.add(Settings.Global.EMERGENCY_TONE);
            MOVED_TO_GLOBAL.add(Settings.Global.CALL_AUTO_RETRY);
            MOVED_TO_GLOBAL.add(Settings.Global.DEBUG_APP);
            MOVED_TO_GLOBAL.add(Settings.Global.WAIT_FOR_DEBUGGER);
            MOVED_TO_GLOBAL.add(Settings.Global.ALWAYS_FINISH_ACTIVITIES);
            MOVED_TO_GLOBAL.add(Settings.Global.TZINFO_UPDATE_CONTENT_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.TZINFO_UPDATE_METADATA_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.SELINUX_UPDATE_CONTENT_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.SELINUX_UPDATE_METADATA_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.SMS_SHORT_CODES_UPDATE_CONTENT_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.SMS_SHORT_CODES_UPDATE_METADATA_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.CERT_PIN_UPDATE_CONTENT_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.CERT_PIN_UPDATE_METADATA_URL);
        }

        /** @hide */
        public static void getMovedToGlobalSettings(Set<String> outKeySet) {
            outKeySet.addAll(MOVED_TO_GLOBAL);
            outKeySet.addAll(MOVED_TO_SECURE_THEN_GLOBAL);
        }

        /** @hide */
        public static void getMovedToSecureSettings(Set<String> outKeySet) {
            outKeySet.addAll(MOVED_TO_SECURE);
        }

        /** @hide */
        public static void getNonLegacyMovedKeys(HashSet<String> outKeySet) {
            outKeySet.addAll(MOVED_TO_GLOBAL);
        }

        /** @hide */
        public static void clearProviderForTest() {
            sProviderHolder.clearProviderForTest();
            sNameValueCache.clearGenerationTrackerForTest();
        }

        /**
         * Look up a name in the database.
         * @param resolver to access the database with
         * @param name to look up in the table
         * @return the corresponding value, or null if not present
         */
        public static String getString(ContentResolver resolver, String name) {
            return getStringForUser(resolver, name, resolver.getUserId());
        }

        /** @hide */
        public static String getStringForUser(ContentResolver resolver, String name,
                int userHandle) {
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Secure, returning read-only value.");
                return Secure.getStringForUser(resolver, name, userHandle);
            }
            if (MOVED_TO_GLOBAL.contains(name) || MOVED_TO_SECURE_THEN_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Global, returning read-only value.");
                return Global.getStringForUser(resolver, name, userHandle);
            }
            return sNameValueCache.getStringForUser(resolver, name, userHandle);
        }

        /**
         * Store a name/value pair into the database.
         * @param resolver to access the database with
         * @param name to store
         * @param value to associate with the name
         * @return true if the value was set, false on database errors
         */
        public static boolean putString(ContentResolver resolver, String name, String value) {
            return putStringForUser(resolver, name, value, resolver.getUserId());
        }

        /** @hide */
        public static boolean putStringForUser(ContentResolver resolver, String name, String value,
                int userHandle) {
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Secure, value is unchanged.");
                return false;
            }
            if (MOVED_TO_GLOBAL.contains(name) || MOVED_TO_SECURE_THEN_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Global, value is unchanged.");
                return false;
            }
            return sNameValueCache.putStringForUser(resolver, name, value, null, false, userHandle);
        }

        /**
         * Construct the content URI for a particular name/value pair,
         * useful for monitoring changes with a ContentObserver.
         * @param name to look up in the table
         * @return the corresponding content URI, or null if not present
         */
        public static Uri getUriFor(String name) {
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                    + " to android.provider.Settings.Secure, returning Secure URI.");
                return Secure.getUriFor(Secure.CONTENT_URI, name);
            }
            if (MOVED_TO_GLOBAL.contains(name) || MOVED_TO_SECURE_THEN_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Global, returning read-only global URI.");
                return Global.getUriFor(Global.CONTENT_URI, name);
            }
            return getUriFor(CONTENT_URI, name);
        }

        /**
         * Convenience function for retrieving a single system settings value
         * as an integer.  Note that internally setting values are always
         * stored as strings; this function converts the string to an integer
         * for you.  The default value will be returned if the setting is
         * not defined or not an integer.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid integer.
         */
        public static int getInt(ContentResolver cr, String name, int def) {
            return getIntForUser(cr, name, def, cr.getUserId());
        }

        /** @hide */
        public static int getIntForUser(ContentResolver cr, String name, int def, int userHandle) {
            String v = getStringForUser(cr, name, userHandle);
            try {
                return v != null ? Integer.parseInt(v) : def;
            } catch (NumberFormatException e) {
                return def;
            }
        }

        /**
         * Convenience function for retrieving a single system settings value
         * as an integer.  Note that internally setting values are always
         * stored as strings; this function converts the string to an integer
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not an integer.
         *
         * @return The setting's current value.
         */
        public static int getInt(ContentResolver cr, String name)
                throws SettingNotFoundException {
            return getIntForUser(cr, name, cr.getUserId());
        }

        /** @hide */
        public static int getIntForUser(ContentResolver cr, String name, int userHandle)
                throws SettingNotFoundException {
            String v = getStringForUser(cr, name, userHandle);
            try {
                return Integer.parseInt(v);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a single settings value as an
         * integer. This will either create a new entry in the table if the
         * given name does not exist, or modify the value of the existing row
         * with that name.  Note that internally setting values are always
         * stored as strings, so this function converts the given value to a
         * string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putInt(ContentResolver cr, String name, int value) {
            return putIntForUser(cr, name, value, cr.getUserId());
        }

        /** @hide */
        public static boolean putIntForUser(ContentResolver cr, String name, int value,
                int userHandle) {
            return putStringForUser(cr, name, Integer.toString(value), userHandle);
        }

        /**
         * Convenience function for retrieving a single system settings value
         * as a {@code long}.  Note that internally setting values are always
         * stored as strings; this function converts the string to a {@code long}
         * for you.  The default value will be returned if the setting is
         * not defined or not a {@code long}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid {@code long}.
         */
        public static long getLong(ContentResolver cr, String name, long def) {
            return getLongForUser(cr, name, def, cr.getUserId());
        }

        /** @hide */
        public static long getLongForUser(ContentResolver cr, String name, long def,
                int userHandle) {
            String valString = getStringForUser(cr, name, userHandle);
            long value;
            try {
                value = valString != null ? Long.parseLong(valString) : def;
            } catch (NumberFormatException e) {
                value = def;
            }
            return value;
        }

        /**
         * Convenience function for retrieving a single system settings value
         * as a {@code long}.  Note that internally setting values are always
         * stored as strings; this function converts the string to a {@code long}
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @return The setting's current value.
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not an integer.
         */
        public static long getLong(ContentResolver cr, String name)
                throws SettingNotFoundException {
            return getLongForUser(cr, name, cr.getUserId());
        }

        /** @hide */
        public static long getLongForUser(ContentResolver cr, String name, int userHandle)
                throws SettingNotFoundException {
            String valString = getStringForUser(cr, name, userHandle);
            try {
                return Long.parseLong(valString);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a single settings value as a long
         * integer. This will either create a new entry in the table if the
         * given name does not exist, or modify the value of the existing row
         * with that name.  Note that internally setting values are always
         * stored as strings, so this function converts the given value to a
         * string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putLong(ContentResolver cr, String name, long value) {
            return putLongForUser(cr, name, value, cr.getUserId());
        }

        /** @hide */
        public static boolean putLongForUser(ContentResolver cr, String name, long value,
                int userHandle) {
            return putStringForUser(cr, name, Long.toString(value), userHandle);
        }

        /**
         * Convenience function for retrieving a single system settings value
         * as a floating point number.  Note that internally setting values are
         * always stored as strings; this function converts the string to an
         * float for you. The default value will be returned if the setting
         * is not defined or not a valid float.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid float.
         */
        public static float getFloat(ContentResolver cr, String name, float def) {
            return getFloatForUser(cr, name, def, cr.getUserId());
        }

        /** @hide */
        public static float getFloatForUser(ContentResolver cr, String name, float def,
                int userHandle) {
            String v = getStringForUser(cr, name, userHandle);
            try {
                return v != null ? Float.parseFloat(v) : def;
            } catch (NumberFormatException e) {
                return def;
            }
        }

        /**
         * Convenience function for retrieving a single system settings value
         * as a float.  Note that internally setting values are always
         * stored as strings; this function converts the string to a float
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not a float.
         *
         * @return The setting's current value.
         */
        public static float getFloat(ContentResolver cr, String name)
                throws SettingNotFoundException {
            return getFloatForUser(cr, name, cr.getUserId());
        }

        /** @hide */
        public static float getFloatForUser(ContentResolver cr, String name, int userHandle)
                throws SettingNotFoundException {
            String v = getStringForUser(cr, name, userHandle);
            if (v == null) {
                throw new SettingNotFoundException(name);
            }
            try {
                return Float.parseFloat(v);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a single settings value as a
         * floating point number. This will either create a new entry in the
         * table if the given name does not exist, or modify the value of the
         * existing row with that name.  Note that internally setting values
         * are always stored as strings, so this function converts the given
         * value to a string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putFloat(ContentResolver cr, String name, float value) {
            return putFloatForUser(cr, name, value, cr.getUserId());
        }

        /** @hide */
        public static boolean putFloatForUser(ContentResolver cr, String name, float value,
                int userHandle) {
            return putStringForUser(cr, name, Float.toString(value), userHandle);
        }

        /**
         * Convenience function to read all of the current
         * configuration-related settings into a
         * {@link Configuration} object.
         *
         * @param cr The ContentResolver to access.
         * @param outConfig Where to place the configuration settings.
         */
        public static void getConfiguration(ContentResolver cr, Configuration outConfig) {
            adjustConfigurationForUser(cr, outConfig, cr.getUserId(),
                    false /* updateSettingsIfEmpty */);
        }

        /** @hide */
        public static void adjustConfigurationForUser(ContentResolver cr, Configuration outConfig,
                int userHandle, boolean updateSettingsIfEmpty) {
            outConfig.fontScale = Settings.System.getFloatForUser(
                    cr, FONT_SCALE, DEFAULT_FONT_SCALE, userHandle);
            if (outConfig.fontScale < 0) {
                outConfig.fontScale = DEFAULT_FONT_SCALE;
            }

            final String localeValue =
                    Settings.System.getStringForUser(cr, SYSTEM_LOCALES, userHandle);
            if (localeValue != null) {
                outConfig.setLocales(LocaleList.forLanguageTags(localeValue));
            } else {
                // Do not update configuration with emtpy settings since we need to take over the
                // locale list of previous user if the settings value is empty. This happens when a
                // new user is created.

                if (updateSettingsIfEmpty) {
                    // Make current configuration persistent. This is necessary the first time a
                    // user log in. At the first login, the configuration settings are empty, so we
                    // need to store the adjusted configuration as the initial settings.
                    Settings.System.putStringForUser(
                            cr, SYSTEM_LOCALES, outConfig.getLocales().toLanguageTags(),
                            userHandle);
                }
            }
        }

        /**
         * @hide Erase the fields in the Configuration that should be applied
         * by the settings.
         */
        public static void clearConfiguration(Configuration inoutConfig) {
            inoutConfig.fontScale = 0;
            if (!inoutConfig.userSetLocale && !inoutConfig.getLocales().isEmpty()) {
                inoutConfig.clearLocales();
            }
        }

        /**
         * Convenience function to write a batch of configuration-related
         * settings from a {@link Configuration} object.
         *
         * @param cr The ContentResolver to access.
         * @param config The settings to write.
         * @return true if the values were set, false on database errors
         */
        public static boolean putConfiguration(ContentResolver cr, Configuration config) {
            return putConfigurationForUser(cr, config, cr.getUserId());
        }

        /** @hide */
        public static boolean putConfigurationForUser(ContentResolver cr, Configuration config,
                int userHandle) {
            return Settings.System.putFloatForUser(cr, FONT_SCALE, config.fontScale, userHandle) &&
                    Settings.System.putStringForUser(
                            cr, SYSTEM_LOCALES, config.getLocales().toLanguageTags(), userHandle);
        }

        /** @hide */
        public static boolean hasInterestingConfigurationChanges(int changes) {
            return (changes & ActivityInfo.CONFIG_FONT_SCALE) != 0 ||
                    (changes & ActivityInfo.CONFIG_LOCALE) != 0;
        }

        /** @deprecated - Do not use */
        @Deprecated
        public static boolean getShowGTalkServiceStatus(ContentResolver cr) {
            return getShowGTalkServiceStatusForUser(cr, cr.getUserId());
        }

        /**
         * @hide
         * @deprecated - Do not use
         */
        @Deprecated
        public static boolean getShowGTalkServiceStatusForUser(ContentResolver cr,
                int userHandle) {
            return getIntForUser(cr, SHOW_GTALK_SERVICE_STATUS, 0, userHandle) != 0;
        }

        /** @deprecated - Do not use */
        @Deprecated
        public static void setShowGTalkServiceStatus(ContentResolver cr, boolean flag) {
            setShowGTalkServiceStatusForUser(cr, flag, cr.getUserId());
        }

        /**
         * @hide
         * @deprecated - Do not use
         */
        @Deprecated
        public static void setShowGTalkServiceStatusForUser(ContentResolver cr, boolean flag,
                int userHandle) {
            putIntForUser(cr, SHOW_GTALK_SERVICE_STATUS, flag ? 1 : 0, userHandle);
        }

        /**
         * @deprecated Use {@link android.provider.Settings.Global#STAY_ON_WHILE_PLUGGED_IN} instead
         */
        @Deprecated
        public static final String STAY_ON_WHILE_PLUGGED_IN = Global.STAY_ON_WHILE_PLUGGED_IN;

        private static final Validator STAY_ON_WHILE_PLUGGED_IN_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                try {
                    int val = Integer.parseInt(value);
                    return (val == 0)
                            || (val == BatteryManager.BATTERY_PLUGGED_AC)
                            || (val == BatteryManager.BATTERY_PLUGGED_USB)
                            || (val == BatteryManager.BATTERY_PLUGGED_WIRELESS)
                            || (val == (BatteryManager.BATTERY_PLUGGED_AC
                                    | BatteryManager.BATTERY_PLUGGED_USB))
                            || (val == (BatteryManager.BATTERY_PLUGGED_AC
                                    | BatteryManager.BATTERY_PLUGGED_WIRELESS))
                            || (val == (BatteryManager.BATTERY_PLUGGED_USB
                                    | BatteryManager.BATTERY_PLUGGED_WIRELESS))
                            || (val == (BatteryManager.BATTERY_PLUGGED_AC
                                    | BatteryManager.BATTERY_PLUGGED_USB
                                    | BatteryManager.BATTERY_PLUGGED_WIRELESS));
                } catch (NumberFormatException e) {
                    return false;
                }
            }
        };

        /**
         * What happens when the user presses the end call button if they're not
         * on a call.<br/>
         * <b>Values:</b><br/>
         * 0 - The end button does nothing.<br/>
         * 1 - The end button goes to the home screen.<br/>
         * 2 - The end button puts the device to sleep and locks the keyguard.<br/>
         * 3 - The end button goes to the home screen.  If the user is already on the
         * home screen, it puts the device to sleep.
         */
        public static final String END_BUTTON_BEHAVIOR = "end_button_behavior";

        private static final Validator END_BUTTON_BEHAVIOR_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 3);

        /**
         * END_BUTTON_BEHAVIOR value for "go home".
         * @hide
         */
        public static final int END_BUTTON_BEHAVIOR_HOME = 0x1;

        /**
         * END_BUTTON_BEHAVIOR value for "go to sleep".
         * @hide
         */
        public static final int END_BUTTON_BEHAVIOR_SLEEP = 0x2;

        /**
         * END_BUTTON_BEHAVIOR default value.
         * @hide
         */
        public static final int END_BUTTON_BEHAVIOR_DEFAULT = END_BUTTON_BEHAVIOR_SLEEP;

        /**
         * Is advanced settings mode turned on. 0 == no, 1 == yes
         * @hide
         */
        public static final String ADVANCED_SETTINGS = "advanced_settings";

        private static final Validator ADVANCED_SETTINGS_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * ADVANCED_SETTINGS default value.
         * @hide
         */
        public static final int ADVANCED_SETTINGS_DEFAULT = 0;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#AIRPLANE_MODE_ON} instead
         */
        @Deprecated
        public static final String AIRPLANE_MODE_ON = Global.AIRPLANE_MODE_ON;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#RADIO_BLUETOOTH} instead
         */
        @Deprecated
        public static final String RADIO_BLUETOOTH = Global.RADIO_BLUETOOTH;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#RADIO_WIFI} instead
         */
        @Deprecated
        public static final String RADIO_WIFI = Global.RADIO_WIFI;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#RADIO_WIMAX} instead
         * {@hide}
         */
        @Deprecated
        public static final String RADIO_WIMAX = Global.RADIO_WIMAX;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#RADIO_CELL} instead
         */
        @Deprecated
        public static final String RADIO_CELL = Global.RADIO_CELL;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#RADIO_NFC} instead
         */
        @Deprecated
        public static final String RADIO_NFC = Global.RADIO_NFC;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#AIRPLANE_MODE_RADIOS} instead
         */
        @Deprecated
        public static final String AIRPLANE_MODE_RADIOS = Global.AIRPLANE_MODE_RADIOS;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#AIRPLANE_MODE_TOGGLEABLE_RADIOS} instead
         *
         * {@hide}
         */
        @Deprecated
        public static final String AIRPLANE_MODE_TOGGLEABLE_RADIOS =
                Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_SLEEP_POLICY} instead
         */
        @Deprecated
        public static final String WIFI_SLEEP_POLICY = Global.WIFI_SLEEP_POLICY;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_SLEEP_POLICY_DEFAULT} instead
         */
        @Deprecated
        public static final int WIFI_SLEEP_POLICY_DEFAULT = Global.WIFI_SLEEP_POLICY_DEFAULT;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED} instead
         */
        @Deprecated
        public static final int WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED =
                Global.WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_SLEEP_POLICY_NEVER} instead
         */
        @Deprecated
        public static final int WIFI_SLEEP_POLICY_NEVER = Global.WIFI_SLEEP_POLICY_NEVER;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#MODE_RINGER} instead
         */
        @Deprecated
        public static final String MODE_RINGER = Global.MODE_RINGER;

        /**
         * Whether to use static IP and other static network attributes.
         * <p>
         * Set to 1 for true and 0 for false.
         *
         * @deprecated Use {@link WifiManager} instead
         */
        @Deprecated
        public static final String WIFI_USE_STATIC_IP = "wifi_use_static_ip";

        private static final Validator WIFI_USE_STATIC_IP_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The static IP address.
         * <p>
         * Example: "192.168.1.51"
         *
         * @deprecated Use {@link WifiManager} instead
         */
        @Deprecated
        public static final String WIFI_STATIC_IP = "wifi_static_ip";

        private static final Validator WIFI_STATIC_IP_VALIDATOR = LENIENT_IP_ADDRESS_VALIDATOR;

        /**
         * If using static IP, the gateway's IP address.
         * <p>
         * Example: "192.168.1.1"
         *
         * @deprecated Use {@link WifiManager} instead
         */
        @Deprecated
        public static final String WIFI_STATIC_GATEWAY = "wifi_static_gateway";

        private static final Validator WIFI_STATIC_GATEWAY_VALIDATOR = LENIENT_IP_ADDRESS_VALIDATOR;

        /**
         * If using static IP, the net mask.
         * <p>
         * Example: "255.255.255.0"
         *
         * @deprecated Use {@link WifiManager} instead
         */
        @Deprecated
        public static final String WIFI_STATIC_NETMASK = "wifi_static_netmask";

        private static final Validator WIFI_STATIC_NETMASK_VALIDATOR = LENIENT_IP_ADDRESS_VALIDATOR;

        /**
         * If using static IP, the primary DNS's IP address.
         * <p>
         * Example: "192.168.1.1"
         *
         * @deprecated Use {@link WifiManager} instead
         */
        @Deprecated
        public static final String WIFI_STATIC_DNS1 = "wifi_static_dns1";

        private static final Validator WIFI_STATIC_DNS1_VALIDATOR = LENIENT_IP_ADDRESS_VALIDATOR;

        /**
         * If using static IP, the secondary DNS's IP address.
         * <p>
         * Example: "192.168.1.2"
         *
         * @deprecated Use {@link WifiManager} instead
         */
        @Deprecated
        public static final String WIFI_STATIC_DNS2 = "wifi_static_dns2";

        private static final Validator WIFI_STATIC_DNS2_VALIDATOR = LENIENT_IP_ADDRESS_VALIDATOR;

        /**
         * Determines whether remote devices may discover and/or connect to
         * this device.
         * <P>Type: INT</P>
         * 2 -- discoverable and connectable
         * 1 -- connectable but not discoverable
         * 0 -- neither connectable nor discoverable
         */
        public static final String BLUETOOTH_DISCOVERABILITY =
            "bluetooth_discoverability";

        private static final Validator BLUETOOTH_DISCOVERABILITY_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 2);

        /**
         * Bluetooth discoverability timeout.  If this value is nonzero, then
         * Bluetooth becomes discoverable for a certain number of seconds,
         * after which is becomes simply connectable.  The value is in seconds.
         */
        public static final String BLUETOOTH_DISCOVERABILITY_TIMEOUT =
            "bluetooth_discoverability_timeout";

        private static final Validator BLUETOOTH_DISCOVERABILITY_TIMEOUT_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#LOCK_PATTERN_ENABLED}
         * instead
         */
        @Deprecated
        public static final String LOCK_PATTERN_ENABLED = Secure.LOCK_PATTERN_ENABLED;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#LOCK_PATTERN_VISIBLE}
         * instead
         */
        @Deprecated
        public static final String LOCK_PATTERN_VISIBLE = "lock_pattern_visible_pattern";

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Secure#LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED}
         * instead
         */
        @Deprecated
        public static final String LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED =
            "lock_pattern_tactile_feedback_enabled";

        /**
         * A formatted string of the next alarm that is set, or the empty string
         * if there is no alarm set.
         *
         * @deprecated Use {@link android.app.AlarmManager#getNextAlarmClock()}.
         */
        @Deprecated
        public static final String NEXT_ALARM_FORMATTED = "next_alarm_formatted";

        private static final Validator NEXT_ALARM_FORMATTED_VALIDATOR = new Validator() {
            private static final int MAX_LENGTH = 1000;

            @Override
            public boolean validate(String value) {
                // TODO: No idea what the correct format is.
                return value == null || value.length() < MAX_LENGTH;
            }
        };

        /**
         * Scaling factor for fonts, float.
         */
        public static final String FONT_SCALE = "font_scale";

        private static final Validator FONT_SCALE_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                try {
                    return Float.parseFloat(value) >= 0;
                } catch (NumberFormatException e) {
                    return false;
                }
            }
        };

        /**
         * The serialized system locale value.
         *
         * Do not use this value directory.
         * To get system locale, use {@link LocaleList#getDefault} instead.
         * To update system locale, use {@link com.android.internal.app.LocalePicker#updateLocales}
         * instead.
         * @hide
         */
        public static final String SYSTEM_LOCALES = "system_locales";


        /**
         * Name of an application package to be debugged.
         *
         * @deprecated Use {@link Global#DEBUG_APP} instead
         */
        @Deprecated
        public static final String DEBUG_APP = Global.DEBUG_APP;

        /**
         * If 1, when launching DEBUG_APP it will wait for the debugger before
         * starting user code.  If 0, it will run normally.
         *
         * @deprecated Use {@link Global#WAIT_FOR_DEBUGGER} instead
         */
        @Deprecated
        public static final String WAIT_FOR_DEBUGGER = Global.WAIT_FOR_DEBUGGER;

        /**
         * Whether or not to dim the screen. 0=no  1=yes
         * @deprecated This setting is no longer used.
         */
        @Deprecated
        public static final String DIM_SCREEN = "dim_screen";

        private static final Validator DIM_SCREEN_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The display color mode.
         * @hide
         */
        public static final String DISPLAY_COLOR_MODE = "display_color_mode";

        /**
         * The amount of time in milliseconds before the device goes to sleep or begins
         * to dream after a period of inactivity.  This value is also known as the
         * user activity timeout period since the screen isn't necessarily turned off
         * when it expires.
         *
         * <p>
         * This value is bounded by maximum timeout set by
         * {@link android.app.admin.DevicePolicyManager#setMaximumTimeToLock(ComponentName, long)}.
         */
        public static final String SCREEN_OFF_TIMEOUT = "screen_off_timeout";

        private static final Validator SCREEN_OFF_TIMEOUT_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * The screen backlight brightness between 0 and 255.
         */
        public static final String SCREEN_BRIGHTNESS = "screen_brightness";

        private static final Validator SCREEN_BRIGHTNESS_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 255);

        /**
         * The screen backlight brightness between 0 and 255.
         * @hide
         */
        public static final String SCREEN_BRIGHTNESS_FOR_VR = "screen_brightness_for_vr";

        private static final Validator SCREEN_BRIGHTNESS_FOR_VR_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 255);

        /**
         * Control whether to enable automatic brightness mode.
         */
        public static final String SCREEN_BRIGHTNESS_MODE = "screen_brightness_mode";

        private static final Validator SCREEN_BRIGHTNESS_MODE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Adjustment to auto-brightness to make it generally more (>0.0 <1.0)
         * or less (<0.0 >-1.0) bright.
         * @hide
         */
        public static final String SCREEN_AUTO_BRIGHTNESS_ADJ = "screen_auto_brightness_adj";

        private static final Validator SCREEN_AUTO_BRIGHTNESS_ADJ_VALIDATOR =
                new SettingsValidators.InclusiveFloatRangeValidator(-1, 1);

        /**
         * SCREEN_BRIGHTNESS_MODE value for manual mode.
         */
        public static final int SCREEN_BRIGHTNESS_MODE_MANUAL = 0;

        /**
         * SCREEN_BRIGHTNESS_MODE value for automatic mode.
         */
        public static final int SCREEN_BRIGHTNESS_MODE_AUTOMATIC = 1;

        /**
         * Control whether the process CPU usage meter should be shown.
         *
         * @deprecated This functionality is no longer available as of
         * {@link android.os.Build.VERSION_CODES#N_MR1}.
         */
        @Deprecated
        public static final String SHOW_PROCESSES = Global.SHOW_PROCESSES;

        /**
         * If 1, the activity manager will aggressively finish activities and
         * processes as soon as they are no longer needed.  If 0, the normal
         * extended lifetime is used.
         *
         * @deprecated Use {@link Global#ALWAYS_FINISH_ACTIVITIES} instead
         */
        @Deprecated
        public static final String ALWAYS_FINISH_ACTIVITIES = Global.ALWAYS_FINISH_ACTIVITIES;

        /**
         * Determines which streams are affected by ringer and zen mode changes. The
         * stream type's bit should be set to 1 if it should be muted when going
         * into an inaudible ringer mode.
         */
        public static final String MODE_RINGER_STREAMS_AFFECTED = "mode_ringer_streams_affected";

        private static final Validator MODE_RINGER_STREAMS_AFFECTED_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
          * Determines which streams are affected by mute. The
          * stream type's bit should be set to 1 if it should be muted when a mute request
          * is received.
          */
        public static final String MUTE_STREAMS_AFFECTED = "mute_streams_affected";

        private static final Validator MUTE_STREAMS_AFFECTED_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * Whether vibrate is on for different events. This is used internally,
         * changing this value will not change the vibrate. See AudioManager.
         */
        public static final String VIBRATE_ON = "vibrate_on";

        private static final Validator VIBRATE_ON_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * If 1, redirects the system vibrator to all currently attached input devices
         * that support vibration.  If there are no such input devices, then the system
         * vibrator is used instead.
         * If 0, does not register the system vibrator.
         *
         * This setting is mainly intended to provide a compatibility mechanism for
         * applications that only know about the system vibrator and do not use the
         * input device vibrator API.
         *
         * @hide
         */
        public static final String VIBRATE_INPUT_DEVICES = "vibrate_input_devices";

        private static final Validator VIBRATE_INPUT_DEVICES_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The intensity of notification vibrations, if configurable.
         *
         * Not all devices are capable of changing their vibration intensity; on these devices
         * there will likely be no difference between the various vibration intensities except for
         * intensity 0 (off) and the rest.
         *
         * <b>Values:</b><br/>
         * 0 - Vibration is disabled<br/>
         * 1 - Weak vibrations<br/>
         * 2 - Medium vibrations<br/>
         * 3 - Strong vibrations
         * @hide
         */
        public static final String NOTIFICATION_VIBRATION_INTENSITY =
                "notification_vibration_intensity";

        /**
         * The intensity of haptic feedback vibrations, if configurable.
         *
         * Not all devices are capable of changing their feedback intensity; on these devices
         * there will likely be no difference between the various vibration intensities except for
         * intensity 0 (off) and the rest.
         *
         * <b>Values:</b><br/>
         * 0 - Vibration is disabled<br/>
         * 1 - Weak vibrations<br/>
         * 2 - Medium vibrations<br/>
         * 3 - Strong vibrations
         * @hide
         */
        public static final String HAPTIC_FEEDBACK_INTENSITY =
                "haptic_feedback_intensity";

        private static final Validator VIBRATION_INTENSITY_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 3);

        /**
         * Ringer volume. This is used internally, changing this value will not
         * change the volume. See AudioManager.
         *
         * @removed Not used by anything since API 2.
         */
        public static final String VOLUME_RING = "volume_ring";

        /**
         * System/notifications volume. This is used internally, changing this
         * value will not change the volume. See AudioManager.
         *
         * @removed Not used by anything since API 2.
         */
        public static final String VOLUME_SYSTEM = "volume_system";

        /**
         * Voice call volume. This is used internally, changing this value will
         * not change the volume. See AudioManager.
         *
         * @removed Not used by anything since API 2.
         */
        public static final String VOLUME_VOICE = "volume_voice";

        /**
         * Music/media/gaming volume. This is used internally, changing this
         * value will not change the volume. See AudioManager.
         *
         * @removed Not used by anything since API 2.
         */
        public static final String VOLUME_MUSIC = "volume_music";

        /**
         * Alarm volume. This is used internally, changing this
         * value will not change the volume. See AudioManager.
         *
         * @removed Not used by anything since API 2.
         */
        public static final String VOLUME_ALARM = "volume_alarm";

        /**
         * Notification volume. This is used internally, changing this
         * value will not change the volume. See AudioManager.
         *
         * @removed Not used by anything since API 2.
         */
        public static final String VOLUME_NOTIFICATION = "volume_notification";

        /**
         * Bluetooth Headset volume. This is used internally, changing this value will
         * not change the volume. See AudioManager.
         *
         * @removed Not used by anything since API 2.
         */
        public static final String VOLUME_BLUETOOTH_SCO = "volume_bluetooth_sco";

        /**
         * @hide
         * Acessibility volume. This is used internally, changing this
         * value will not change the volume.
         */
        public static final String VOLUME_ACCESSIBILITY = "volume_a11y";

        /**
         * Master volume (float in the range 0.0f to 1.0f).
         *
         * @hide
         */
        public static final String VOLUME_MASTER = "volume_master";

        /**
         * Master mono (int 1 = mono, 0 = normal).
         *
         * @hide
         */
        public static final String MASTER_MONO = "master_mono";

        private static final Validator MASTER_MONO_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the notifications should use the ring volume (value of 1) or
         * a separate notification volume (value of 0). In most cases, users
         * will have this enabled so the notification and ringer volumes will be
         * the same. However, power users can disable this and use the separate
         * notification volume control.
         * <p>
         * Note: This is a one-off setting that will be removed in the future
         * when there is profile support. For this reason, it is kept hidden
         * from the public APIs.
         *
         * @hide
         * @deprecated
         */
        @Deprecated
        public static final String NOTIFICATIONS_USE_RING_VOLUME =
            "notifications_use_ring_volume";

        private static final Validator NOTIFICATIONS_USE_RING_VOLUME_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether silent mode should allow vibration feedback. This is used
         * internally in AudioService and the Sound settings activity to
         * coordinate decoupling of vibrate and silent modes. This setting
         * will likely be removed in a future release with support for
         * audio/vibe feedback profiles.
         *
         * Not used anymore. On devices with vibrator, the user explicitly selects
         * silent or vibrate mode.
         * Kept for use by legacy database upgrade code in DatabaseHelper.
         * @hide
         */
        public static final String VIBRATE_IN_SILENT = "vibrate_in_silent";

        private static final Validator VIBRATE_IN_SILENT_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The mapping of stream type (integer) to its setting.
         *
         * @removed  Not used by anything since API 2.
         */
        public static final String[] VOLUME_SETTINGS = {
            VOLUME_VOICE, VOLUME_SYSTEM, VOLUME_RING, VOLUME_MUSIC,
            VOLUME_ALARM, VOLUME_NOTIFICATION, VOLUME_BLUETOOTH_SCO
        };

        /**
         * @hide
         * The mapping of stream type (integer) to its setting.
         * Unlike the VOLUME_SETTINGS array, this one contains as many entries as
         * AudioSystem.NUM_STREAM_TYPES, and has empty strings for stream types whose volumes
         * are never persisted.
         */
        public static final String[] VOLUME_SETTINGS_INT = {
                VOLUME_VOICE, VOLUME_SYSTEM, VOLUME_RING, VOLUME_MUSIC,
                VOLUME_ALARM, VOLUME_NOTIFICATION, VOLUME_BLUETOOTH_SCO,
                "" /*STREAM_SYSTEM_ENFORCED, no setting for this stream*/,
                "" /*STREAM_DTMF, no setting for this stream*/,
                "" /*STREAM_TTS, no setting for this stream*/,
                VOLUME_ACCESSIBILITY
            };

        /**
         * Appended to various volume related settings to record the previous
         * values before they the settings were affected by a silent/vibrate
         * ringer mode change.
         *
         * @removed  Not used by anything since API 2.
         */
        public static final String APPEND_FOR_LAST_AUDIBLE = "_last_audible";

        /**
         * Persistent store for the system-wide default ringtone URI.
         * <p>
         * If you need to play the default ringtone at any given time, it is recommended
         * you give {@link #DEFAULT_RINGTONE_URI} to the media player.  It will resolve
         * to the set default ringtone at the time of playing.
         *
         * @see #DEFAULT_RINGTONE_URI
         */
        public static final String RINGTONE = "ringtone";

        private static final Validator RINGTONE_VALIDATOR = URI_VALIDATOR;

        /**
         * A {@link Uri} that will point to the current default ringtone at any
         * given time.
         * <p>
         * If the current default ringtone is in the DRM provider and the caller
         * does not have permission, the exception will be a
         * FileNotFoundException.
         */
        public static final Uri DEFAULT_RINGTONE_URI = getUriFor(RINGTONE);

        /** {@hide} */
        public static final String RINGTONE_CACHE = "ringtone_cache";
        /** {@hide} */
        public static final Uri RINGTONE_CACHE_URI = getUriFor(RINGTONE_CACHE);

        /**
         * Persistent store for the system-wide default notification sound.
         *
         * @see #RINGTONE
         * @see #DEFAULT_NOTIFICATION_URI
         */
        public static final String NOTIFICATION_SOUND = "notification_sound";

        private static final Validator NOTIFICATION_SOUND_VALIDATOR = URI_VALIDATOR;

        /**
         * A {@link Uri} that will point to the current default notification
         * sound at any given time.
         *
         * @see #DEFAULT_RINGTONE_URI
         */
        public static final Uri DEFAULT_NOTIFICATION_URI = getUriFor(NOTIFICATION_SOUND);

        /** {@hide} */
        public static final String NOTIFICATION_SOUND_CACHE = "notification_sound_cache";
        /** {@hide} */
        public static final Uri NOTIFICATION_SOUND_CACHE_URI = getUriFor(NOTIFICATION_SOUND_CACHE);

        /**
         * Persistent store for the system-wide default alarm alert.
         *
         * @see #RINGTONE
         * @see #DEFAULT_ALARM_ALERT_URI
         */
        public static final String ALARM_ALERT = "alarm_alert";

        private static final Validator ALARM_ALERT_VALIDATOR = URI_VALIDATOR;

        /**
         * A {@link Uri} that will point to the current default alarm alert at
         * any given time.
         *
         * @see #DEFAULT_ALARM_ALERT_URI
         */
        public static final Uri DEFAULT_ALARM_ALERT_URI = getUriFor(ALARM_ALERT);

        /** {@hide} */
        public static final String ALARM_ALERT_CACHE = "alarm_alert_cache";
        /** {@hide} */
        public static final Uri ALARM_ALERT_CACHE_URI = getUriFor(ALARM_ALERT_CACHE);

        /**
         * Persistent store for the system default media button event receiver.
         *
         * @hide
         */
        public static final String MEDIA_BUTTON_RECEIVER = "media_button_receiver";

        private static final Validator MEDIA_BUTTON_RECEIVER_VALIDATOR = COMPONENT_NAME_VALIDATOR;

        /**
         * Setting to enable Auto Replace (AutoText) in text editors. 1 = On, 0 = Off
         */
        public static final String TEXT_AUTO_REPLACE = "auto_replace";

        private static final Validator TEXT_AUTO_REPLACE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Setting to enable Auto Caps in text editors. 1 = On, 0 = Off
         */
        public static final String TEXT_AUTO_CAPS = "auto_caps";

        private static final Validator TEXT_AUTO_CAPS_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Setting to enable Auto Punctuate in text editors. 1 = On, 0 = Off. This
         * feature converts two spaces to a "." and space.
         */
        public static final String TEXT_AUTO_PUNCTUATE = "auto_punctuate";

        private static final Validator TEXT_AUTO_PUNCTUATE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Setting to showing password characters in text editors. 1 = On, 0 = Off
         */
        public static final String TEXT_SHOW_PASSWORD = "show_password";

        private static final Validator TEXT_SHOW_PASSWORD_VALIDATOR = BOOLEAN_VALIDATOR;

        public static final String SHOW_GTALK_SERVICE_STATUS =
                "SHOW_GTALK_SERVICE_STATUS";

        private static final Validator SHOW_GTALK_SERVICE_STATUS_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Name of activity to use for wallpaper on the home screen.
         *
         * @deprecated Use {@link WallpaperManager} instead.
         */
        @Deprecated
        public static final String WALLPAPER_ACTIVITY = "wallpaper_activity";

        private static final Validator WALLPAPER_ACTIVITY_VALIDATOR = new Validator() {
            private static final int MAX_LENGTH = 1000;

            @Override
            public boolean validate(String value) {
                if (value != null && value.length() > MAX_LENGTH) {
                    return false;
                }
                return ComponentName.unflattenFromString(value) != null;
            }
        };

        /**
         * @deprecated Use {@link android.provider.Settings.Global#AUTO_TIME}
         * instead
         */
        @Deprecated
        public static final String AUTO_TIME = Global.AUTO_TIME;

        private static final Validator AUTO_TIME_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#AUTO_TIME_ZONE}
         * instead
         */
        @Deprecated
        public static final String AUTO_TIME_ZONE = Global.AUTO_TIME_ZONE;

        private static final Validator AUTO_TIME_ZONE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Display times as 12 or 24 hours
         *   12
         *   24
         */
        public static final String TIME_12_24 = "time_12_24";

        /** @hide */
        public static final Validator TIME_12_24_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[] {"12", "24", null});

        /**
         * Date format string
         *   mm/dd/yyyy
         *   dd/mm/yyyy
         *   yyyy/mm/dd
         */
        public static final String DATE_FORMAT = "date_format";

        /** @hide */
        public static final Validator DATE_FORMAT_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                try {
                    new SimpleDateFormat(value);
                    return true;
                } catch (IllegalArgumentException e) {
                    return false;
                }
            }
        };

        /**
         * Whether the setup wizard has been run before (on first boot), or if
         * it still needs to be run.
         *
         * nonzero = it has been run in the past
         * 0 = it has not been run in the past
         */
        public static final String SETUP_WIZARD_HAS_RUN = "setup_wizard_has_run";

        /** @hide */
        public static final Validator SETUP_WIZARD_HAS_RUN_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Scaling factor for normal window animations. Setting to 0 will disable window
         * animations.
         *
         * @deprecated Use {@link Global#WINDOW_ANIMATION_SCALE} instead
         */
        @Deprecated
        public static final String WINDOW_ANIMATION_SCALE = Global.WINDOW_ANIMATION_SCALE;

        /**
         * Scaling factor for activity transition animations. Setting to 0 will disable window
         * animations.
         *
         * @deprecated Use {@link Global#TRANSITION_ANIMATION_SCALE} instead
         */
        @Deprecated
        public static final String TRANSITION_ANIMATION_SCALE = Global.TRANSITION_ANIMATION_SCALE;

        /**
         * Scaling factor for Animator-based animations. This affects both the start delay and
         * duration of all such animations. Setting to 0 will cause animations to end immediately.
         * The default value is 1.
         *
         * @deprecated Use {@link Global#ANIMATOR_DURATION_SCALE} instead
         */
        @Deprecated
        public static final String ANIMATOR_DURATION_SCALE = Global.ANIMATOR_DURATION_SCALE;

        /**
         * Control whether the accelerometer will be used to change screen
         * orientation.  If 0, it will not be used unless explicitly requested
         * by the application; if 1, it will be used by default unless explicitly
         * disabled by the application.
         */
        public static final String ACCELEROMETER_ROTATION = "accelerometer_rotation";

        /** @hide */
        public static final Validator ACCELEROMETER_ROTATION_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Default screen rotation when no other policy applies.
         * When {@link #ACCELEROMETER_ROTATION} is zero and no on-screen Activity expresses a
         * preference, this rotation value will be used. Must be one of the
         * {@link android.view.Surface#ROTATION_0 Surface rotation constants}.
         *
         * @see android.view.Display#getRotation
         */
        public static final String USER_ROTATION = "user_rotation";

        /** @hide */
        public static final Validator USER_ROTATION_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 3);

        /**
         * Control whether the rotation lock toggle in the System UI should be hidden.
         * Typically this is done for accessibility purposes to make it harder for
         * the user to accidentally toggle the rotation lock while the display rotation
         * has been locked for accessibility.
         *
         * If 0, then rotation lock toggle is not hidden for accessibility (although it may be
         * unavailable for other reasons).  If 1, then the rotation lock toggle is hidden.
         *
         * @hide
         */
        public static final String HIDE_ROTATION_LOCK_TOGGLE_FOR_ACCESSIBILITY =
                "hide_rotation_lock_toggle_for_accessibility";

        /** @hide */
        public static final Validator HIDE_ROTATION_LOCK_TOGGLE_FOR_ACCESSIBILITY_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Whether the phone vibrates when it is ringing due to an incoming call. This will
         * be used by Phone and Setting apps; it shouldn't affect other apps.
         * The value is boolean (1 or 0).
         *
         * Note: this is not same as "vibrate on ring", which had been available until ICS.
         * It was about AudioManager's setting and thus affected all the applications which
         * relied on the setting, while this is purely about the vibration setting for incoming
         * calls.
         */
        public static final String VIBRATE_WHEN_RINGING = "vibrate_when_ringing";

        /** @hide */
        public static final Validator VIBRATE_WHEN_RINGING_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the audible DTMF tones are played by the dialer when dialing. The value is
         * boolean (1 or 0).
         */
        public static final String DTMF_TONE_WHEN_DIALING = "dtmf_tone";

        /** @hide */
        public static final Validator DTMF_TONE_WHEN_DIALING_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * CDMA only settings
         * DTMF tone type played by the dialer when dialing.
         *                 0 = Normal
         *                 1 = Long
         */
        public static final String DTMF_TONE_TYPE_WHEN_DIALING = "dtmf_tone_type";

        /** @hide */
        public static final Validator DTMF_TONE_TYPE_WHEN_DIALING_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the hearing aid is enabled. The value is
         * boolean (1 or 0).
         * @hide
         */
        public static final String HEARING_AID = "hearing_aid";

        /** @hide */
        public static final Validator HEARING_AID_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * CDMA only settings
         * TTY Mode
         * 0 = OFF
         * 1 = FULL
         * 2 = VCO
         * 3 = HCO
         * @hide
         */
        public static final String TTY_MODE = "tty_mode";

        /** @hide */
        public static final Validator TTY_MODE_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 3);

        /**
         * User-selected RTT mode. When on, outgoing and incoming calls will be answered as RTT
         * calls when supported by the device and carrier. Boolean value.
         * 0 = OFF
         * 1 = ON
         */
        public static final String RTT_CALLING_MODE = "rtt_calling_mode";

        /** @hide */
        public static final Validator RTT_CALLING_MODE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the sounds effects (key clicks, lid open ...) are enabled. The value is
         * boolean (1 or 0).
         */
        public static final String SOUND_EFFECTS_ENABLED = "sound_effects_enabled";

        /** @hide */
        public static final Validator SOUND_EFFECTS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether haptic feedback (Vibrate on tap) is enabled. The value is
         * boolean (1 or 0).
         */
        public static final String HAPTIC_FEEDBACK_ENABLED = "haptic_feedback_enabled";

        /** @hide */
        public static final Validator HAPTIC_FEEDBACK_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Each application that shows web suggestions should have its own
         * setting for this.
         */
        @Deprecated
        public static final String SHOW_WEB_SUGGESTIONS = "show_web_suggestions";

        /** @hide */
        public static final Validator SHOW_WEB_SUGGESTIONS_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the notification LED should repeatedly flash when a notification is
         * pending. The value is boolean (1 or 0).
         * @hide
         */
        public static final String NOTIFICATION_LIGHT_PULSE = "notification_light_pulse";

        /** @hide */
        public static final Validator NOTIFICATION_LIGHT_PULSE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Show pointer location on screen?
         * 0 = no
         * 1 = yes
         * @hide
         */
        public static final String POINTER_LOCATION = "pointer_location";

        /** @hide */
        public static final Validator POINTER_LOCATION_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Show touch positions on screen?
         * 0 = no
         * 1 = yes
         * @hide
         */
        public static final String SHOW_TOUCHES = "show_touches";

        /** @hide */
        public static final Validator SHOW_TOUCHES_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Log raw orientation data from
         * {@link com.android.server.policy.WindowOrientationListener} for use with the
         * orientationplot.py tool.
         * 0 = no
         * 1 = yes
         * @hide
         */
        public static final String WINDOW_ORIENTATION_LISTENER_LOG =
                "window_orientation_listener_log";

        /** @hide */
        public static final Validator WINDOW_ORIENTATION_LISTENER_LOG_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#POWER_SOUNDS_ENABLED}
         * instead
         * @hide
         */
        @Deprecated
        public static final String POWER_SOUNDS_ENABLED = Global.POWER_SOUNDS_ENABLED;

        private static final Validator POWER_SOUNDS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DOCK_SOUNDS_ENABLED}
         * instead
         * @hide
         */
        @Deprecated
        public static final String DOCK_SOUNDS_ENABLED = Global.DOCK_SOUNDS_ENABLED;

        private static final Validator DOCK_SOUNDS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether to play sounds when the keyguard is shown and dismissed.
         * @hide
         */
        public static final String LOCKSCREEN_SOUNDS_ENABLED = "lockscreen_sounds_enabled";

        /** @hide */
        public static final Validator LOCKSCREEN_SOUNDS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the lockscreen should be completely disabled.
         * @hide
         */
        public static final String LOCKSCREEN_DISABLED = "lockscreen.disabled";

        /** @hide */
        public static final Validator LOCKSCREEN_DISABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#LOW_BATTERY_SOUND}
         * instead
         * @hide
         */
        @Deprecated
        public static final String LOW_BATTERY_SOUND = Global.LOW_BATTERY_SOUND;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DESK_DOCK_SOUND}
         * instead
         * @hide
         */
        @Deprecated
        public static final String DESK_DOCK_SOUND = Global.DESK_DOCK_SOUND;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DESK_UNDOCK_SOUND}
         * instead
         * @hide
         */
        @Deprecated
        public static final String DESK_UNDOCK_SOUND = Global.DESK_UNDOCK_SOUND;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#CAR_DOCK_SOUND}
         * instead
         * @hide
         */
        @Deprecated
        public static final String CAR_DOCK_SOUND = Global.CAR_DOCK_SOUND;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#CAR_UNDOCK_SOUND}
         * instead
         * @hide
         */
        @Deprecated
        public static final String CAR_UNDOCK_SOUND = Global.CAR_UNDOCK_SOUND;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#LOCK_SOUND}
         * instead
         * @hide
         */
        @Deprecated
        public static final String LOCK_SOUND = Global.LOCK_SOUND;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#UNLOCK_SOUND}
         * instead
         * @hide
         */
        @Deprecated
        public static final String UNLOCK_SOUND = Global.UNLOCK_SOUND;

        /**
         * Receive incoming SIP calls?
         * 0 = no
         * 1 = yes
         * @hide
         */
        public static final String SIP_RECEIVE_CALLS = "sip_receive_calls";

        /** @hide */
        public static final Validator SIP_RECEIVE_CALLS_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Call Preference String.
         * "SIP_ALWAYS" : Always use SIP with network access
         * "SIP_ADDRESS_ONLY" : Only if destination is a SIP address
         * @hide
         */
        public static final String SIP_CALL_OPTIONS = "sip_call_options";

        /** @hide */
        public static final Validator SIP_CALL_OPTIONS_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(
                        new String[] {"SIP_ALWAYS", "SIP_ADDRESS_ONLY"});

        /**
         * One of the sip call options: Always use SIP with network access.
         * @hide
         */
        public static final String SIP_ALWAYS = "SIP_ALWAYS";

        /** @hide */
        public static final Validator SIP_ALWAYS_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * One of the sip call options: Only if destination is a SIP address.
         * @hide
         */
        public static final String SIP_ADDRESS_ONLY = "SIP_ADDRESS_ONLY";

        /** @hide */
        public static final Validator SIP_ADDRESS_ONLY_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use SIP_ALWAYS or SIP_ADDRESS_ONLY instead.  Formerly used to indicate that
         * the user should be prompted each time a call is made whether it should be placed using
         * SIP.  The {@link com.android.providers.settings.DatabaseHelper} replaces this with
         * SIP_ADDRESS_ONLY.
         * @hide
         */
        @Deprecated
        public static final String SIP_ASK_ME_EACH_TIME = "SIP_ASK_ME_EACH_TIME";

        /** @hide */
        public static final Validator SIP_ASK_ME_EACH_TIME_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Pointer speed setting.
         * This is an integer value in a range between -7 and +7, so there are 15 possible values.
         *   -7 = slowest
         *    0 = default speed
         *   +7 = fastest
         * @hide
         */
        public static final String POINTER_SPEED = "pointer_speed";

        /** @hide */
        public static final Validator POINTER_SPEED_VALIDATOR =
                new SettingsValidators.InclusiveFloatRangeValidator(-7, 7);

        /**
         * Whether lock-to-app will be triggered by long-press on recents.
         * @hide
         */
        public static final String LOCK_TO_APP_ENABLED = "lock_to_app_enabled";

        /** @hide */
        public static final Validator LOCK_TO_APP_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * I am the lolrus.
         * <p>
         * Nonzero values indicate that the user has a bukkit.
         * Backward-compatible with <code>PrefGetPreference(prefAllowEasterEggs)</code>.
         * @hide
         */
        public static final String EGG_MODE = "egg_mode";

        /** @hide */
        public static final Validator EGG_MODE_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                try {
                    return Long.parseLong(value) >= 0;
                } catch (NumberFormatException e) {
                    return false;
                }
            }
        };

        /**
         * Setting to determine whether or not to show the battery percentage in the status bar.
         *    0 - Don't show percentage
         *    1 - Show percentage
         * @hide
         */
        public static final String SHOW_BATTERY_PERCENT = "status_bar_show_battery_percent";

        /** @hide */
        private static final Validator SHOW_BATTERY_PERCENT_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * IMPORTANT: If you add a new public settings you also have to add it to
         * PUBLIC_SETTINGS below. If the new setting is hidden you have to add
         * it to PRIVATE_SETTINGS below. Also add a validator that can validate
         * the setting value. See an example above.
         */

        /**
         * Settings to backup. This is here so that it's in the same place as the settings
         * keys and easy to update.
         *
         * NOTE: Settings are backed up and restored in the order they appear
         *       in this array. If you have one setting depending on another,
         *       make sure that they are ordered appropriately.
         *
         * @hide
         */
        public static final String[] SETTINGS_TO_BACKUP = {
            STAY_ON_WHILE_PLUGGED_IN,   // moved to global
            WIFI_USE_STATIC_IP,
            WIFI_STATIC_IP,
            WIFI_STATIC_GATEWAY,
            WIFI_STATIC_NETMASK,
            WIFI_STATIC_DNS1,
            WIFI_STATIC_DNS2,
            BLUETOOTH_DISCOVERABILITY,
            BLUETOOTH_DISCOVERABILITY_TIMEOUT,
            FONT_SCALE,
            DIM_SCREEN,
            SCREEN_OFF_TIMEOUT,
            SCREEN_BRIGHTNESS,
            SCREEN_BRIGHTNESS_MODE,
            SCREEN_AUTO_BRIGHTNESS_ADJ,
            SCREEN_BRIGHTNESS_FOR_VR,
            VIBRATE_INPUT_DEVICES,
            MODE_RINGER_STREAMS_AFFECTED,
            TEXT_AUTO_REPLACE,
            TEXT_AUTO_CAPS,
            TEXT_AUTO_PUNCTUATE,
            TEXT_SHOW_PASSWORD,
            AUTO_TIME,                  // moved to global
            AUTO_TIME_ZONE,             // moved to global
            TIME_12_24,
            DATE_FORMAT,
            DTMF_TONE_WHEN_DIALING,
            DTMF_TONE_TYPE_WHEN_DIALING,
            HEARING_AID,
            RTT_CALLING_MODE,
            TTY_MODE,
            MASTER_MONO,
            SOUND_EFFECTS_ENABLED,
            HAPTIC_FEEDBACK_ENABLED,
            POWER_SOUNDS_ENABLED,       // moved to global
            DOCK_SOUNDS_ENABLED,        // moved to global
            LOCKSCREEN_SOUNDS_ENABLED,
            SHOW_WEB_SUGGESTIONS,
            SIP_CALL_OPTIONS,
            SIP_RECEIVE_CALLS,
            POINTER_SPEED,
            VIBRATE_WHEN_RINGING,
            RINGTONE,
            LOCK_TO_APP_ENABLED,
            NOTIFICATION_SOUND,
            ACCELEROMETER_ROTATION,
            SHOW_BATTERY_PERCENT,
            NOTIFICATION_VIBRATION_INTENSITY,
            HAPTIC_FEEDBACK_INTENSITY,
        };

        /**
         * Keys we no longer back up under the current schema, but want to continue to
         * process when restoring historical backup datasets.
         *
         * All settings in {@link LEGACY_RESTORE_SETTINGS} array *must* have a non-null validator,
         * otherwise they won't be restored.
         *
         * @hide
         */
        public static final String[] LEGACY_RESTORE_SETTINGS = {
        };

        /**
         * These are all public system settings
         *
         * @hide
         */
        public static final Set<String> PUBLIC_SETTINGS = new ArraySet<>();
        static {
            PUBLIC_SETTINGS.add(END_BUTTON_BEHAVIOR);
            PUBLIC_SETTINGS.add(WIFI_USE_STATIC_IP);
            PUBLIC_SETTINGS.add(WIFI_STATIC_IP);
            PUBLIC_SETTINGS.add(WIFI_STATIC_GATEWAY);
            PUBLIC_SETTINGS.add(WIFI_STATIC_NETMASK);
            PUBLIC_SETTINGS.add(WIFI_STATIC_DNS1);
            PUBLIC_SETTINGS.add(WIFI_STATIC_DNS2);
            PUBLIC_SETTINGS.add(BLUETOOTH_DISCOVERABILITY);
            PUBLIC_SETTINGS.add(BLUETOOTH_DISCOVERABILITY_TIMEOUT);
            PUBLIC_SETTINGS.add(NEXT_ALARM_FORMATTED);
            PUBLIC_SETTINGS.add(FONT_SCALE);
            PUBLIC_SETTINGS.add(DIM_SCREEN);
            PUBLIC_SETTINGS.add(SCREEN_OFF_TIMEOUT);
            PUBLIC_SETTINGS.add(SCREEN_BRIGHTNESS);
            PUBLIC_SETTINGS.add(SCREEN_BRIGHTNESS_MODE);
            PUBLIC_SETTINGS.add(MODE_RINGER_STREAMS_AFFECTED);
            PUBLIC_SETTINGS.add(MUTE_STREAMS_AFFECTED);
            PUBLIC_SETTINGS.add(VIBRATE_ON);
            PUBLIC_SETTINGS.add(VOLUME_RING);
            PUBLIC_SETTINGS.add(VOLUME_SYSTEM);
            PUBLIC_SETTINGS.add(VOLUME_VOICE);
            PUBLIC_SETTINGS.add(VOLUME_MUSIC);
            PUBLIC_SETTINGS.add(VOLUME_ALARM);
            PUBLIC_SETTINGS.add(VOLUME_NOTIFICATION);
            PUBLIC_SETTINGS.add(VOLUME_BLUETOOTH_SCO);
            PUBLIC_SETTINGS.add(RINGTONE);
            PUBLIC_SETTINGS.add(NOTIFICATION_SOUND);
            PUBLIC_SETTINGS.add(ALARM_ALERT);
            PUBLIC_SETTINGS.add(TEXT_AUTO_REPLACE);
            PUBLIC_SETTINGS.add(TEXT_AUTO_CAPS);
            PUBLIC_SETTINGS.add(TEXT_AUTO_PUNCTUATE);
            PUBLIC_SETTINGS.add(TEXT_SHOW_PASSWORD);
            PUBLIC_SETTINGS.add(SHOW_GTALK_SERVICE_STATUS);
            PUBLIC_SETTINGS.add(WALLPAPER_ACTIVITY);
            PUBLIC_SETTINGS.add(TIME_12_24);
            PUBLIC_SETTINGS.add(DATE_FORMAT);
            PUBLIC_SETTINGS.add(SETUP_WIZARD_HAS_RUN);
            PUBLIC_SETTINGS.add(ACCELEROMETER_ROTATION);
            PUBLIC_SETTINGS.add(USER_ROTATION);
            PUBLIC_SETTINGS.add(DTMF_TONE_WHEN_DIALING);
            PUBLIC_SETTINGS.add(SOUND_EFFECTS_ENABLED);
            PUBLIC_SETTINGS.add(HAPTIC_FEEDBACK_ENABLED);
            PUBLIC_SETTINGS.add(SHOW_WEB_SUGGESTIONS);
            PUBLIC_SETTINGS.add(VIBRATE_WHEN_RINGING);
        }

        /**
         * These are all hidden system settings.
         *
         * @hide
         */
        public static final Set<String> PRIVATE_SETTINGS = new ArraySet<>();
        static {
            PRIVATE_SETTINGS.add(WIFI_USE_STATIC_IP);
            PRIVATE_SETTINGS.add(END_BUTTON_BEHAVIOR);
            PRIVATE_SETTINGS.add(ADVANCED_SETTINGS);
            PRIVATE_SETTINGS.add(SCREEN_AUTO_BRIGHTNESS_ADJ);
            PRIVATE_SETTINGS.add(VIBRATE_INPUT_DEVICES);
            PRIVATE_SETTINGS.add(VOLUME_MASTER);
            PRIVATE_SETTINGS.add(MASTER_MONO);
            PRIVATE_SETTINGS.add(NOTIFICATIONS_USE_RING_VOLUME);
            PRIVATE_SETTINGS.add(VIBRATE_IN_SILENT);
            PRIVATE_SETTINGS.add(MEDIA_BUTTON_RECEIVER);
            PRIVATE_SETTINGS.add(HIDE_ROTATION_LOCK_TOGGLE_FOR_ACCESSIBILITY);
            PRIVATE_SETTINGS.add(DTMF_TONE_TYPE_WHEN_DIALING);
            PRIVATE_SETTINGS.add(HEARING_AID);
            PRIVATE_SETTINGS.add(TTY_MODE);
            PRIVATE_SETTINGS.add(NOTIFICATION_LIGHT_PULSE);
            PRIVATE_SETTINGS.add(POINTER_LOCATION);
            PRIVATE_SETTINGS.add(SHOW_TOUCHES);
            PRIVATE_SETTINGS.add(WINDOW_ORIENTATION_LISTENER_LOG);
            PRIVATE_SETTINGS.add(POWER_SOUNDS_ENABLED);
            PRIVATE_SETTINGS.add(DOCK_SOUNDS_ENABLED);
            PRIVATE_SETTINGS.add(LOCKSCREEN_SOUNDS_ENABLED);
            PRIVATE_SETTINGS.add(LOCKSCREEN_DISABLED);
            PRIVATE_SETTINGS.add(LOW_BATTERY_SOUND);
            PRIVATE_SETTINGS.add(DESK_DOCK_SOUND);
            PRIVATE_SETTINGS.add(DESK_UNDOCK_SOUND);
            PRIVATE_SETTINGS.add(CAR_DOCK_SOUND);
            PRIVATE_SETTINGS.add(CAR_UNDOCK_SOUND);
            PRIVATE_SETTINGS.add(LOCK_SOUND);
            PRIVATE_SETTINGS.add(UNLOCK_SOUND);
            PRIVATE_SETTINGS.add(SIP_RECEIVE_CALLS);
            PRIVATE_SETTINGS.add(SIP_CALL_OPTIONS);
            PRIVATE_SETTINGS.add(SIP_ALWAYS);
            PRIVATE_SETTINGS.add(SIP_ADDRESS_ONLY);
            PRIVATE_SETTINGS.add(SIP_ASK_ME_EACH_TIME);
            PRIVATE_SETTINGS.add(POINTER_SPEED);
            PRIVATE_SETTINGS.add(LOCK_TO_APP_ENABLED);
            PRIVATE_SETTINGS.add(EGG_MODE);
            PRIVATE_SETTINGS.add(SHOW_BATTERY_PERCENT);
        }

        /**
         * These are all public system settings
         *
         * All settings in {@link SETTINGS_TO_BACKUP} array *must* have a non-null validator,
         * otherwise they won't be restored.
         *
         * @hide
         */
        public static final Map<String, Validator> VALIDATORS = new ArrayMap<>();
        static {
            VALIDATORS.put(STAY_ON_WHILE_PLUGGED_IN, STAY_ON_WHILE_PLUGGED_IN_VALIDATOR);
            VALIDATORS.put(END_BUTTON_BEHAVIOR, END_BUTTON_BEHAVIOR_VALIDATOR);
            VALIDATORS.put(WIFI_USE_STATIC_IP, WIFI_USE_STATIC_IP_VALIDATOR);
            VALIDATORS.put(BLUETOOTH_DISCOVERABILITY, BLUETOOTH_DISCOVERABILITY_VALIDATOR);
            VALIDATORS.put(BLUETOOTH_DISCOVERABILITY_TIMEOUT,
                    BLUETOOTH_DISCOVERABILITY_TIMEOUT_VALIDATOR);
            VALIDATORS.put(NEXT_ALARM_FORMATTED, NEXT_ALARM_FORMATTED_VALIDATOR);
            VALIDATORS.put(FONT_SCALE, FONT_SCALE_VALIDATOR);
            VALIDATORS.put(DIM_SCREEN, DIM_SCREEN_VALIDATOR);
            VALIDATORS.put(SCREEN_OFF_TIMEOUT, SCREEN_OFF_TIMEOUT_VALIDATOR);
            VALIDATORS.put(SCREEN_BRIGHTNESS, SCREEN_BRIGHTNESS_VALIDATOR);
            VALIDATORS.put(SCREEN_BRIGHTNESS_FOR_VR, SCREEN_BRIGHTNESS_FOR_VR_VALIDATOR);
            VALIDATORS.put(SCREEN_BRIGHTNESS_MODE, SCREEN_BRIGHTNESS_MODE_VALIDATOR);
            VALIDATORS.put(MODE_RINGER_STREAMS_AFFECTED, MODE_RINGER_STREAMS_AFFECTED_VALIDATOR);
            VALIDATORS.put(MUTE_STREAMS_AFFECTED, MUTE_STREAMS_AFFECTED_VALIDATOR);
            VALIDATORS.put(VIBRATE_ON, VIBRATE_ON_VALIDATOR);
            VALIDATORS.put(NOTIFICATION_VIBRATION_INTENSITY, VIBRATION_INTENSITY_VALIDATOR);
            VALIDATORS.put(HAPTIC_FEEDBACK_INTENSITY, VIBRATION_INTENSITY_VALIDATOR);
            VALIDATORS.put(RINGTONE, RINGTONE_VALIDATOR);
            VALIDATORS.put(NOTIFICATION_SOUND, NOTIFICATION_SOUND_VALIDATOR);
            VALIDATORS.put(ALARM_ALERT, ALARM_ALERT_VALIDATOR);
            VALIDATORS.put(TEXT_AUTO_REPLACE, TEXT_AUTO_REPLACE_VALIDATOR);
            VALIDATORS.put(TEXT_AUTO_CAPS, TEXT_AUTO_CAPS_VALIDATOR);
            VALIDATORS.put(TEXT_AUTO_PUNCTUATE, TEXT_AUTO_PUNCTUATE_VALIDATOR);
            VALIDATORS.put(TEXT_SHOW_PASSWORD, TEXT_SHOW_PASSWORD_VALIDATOR);
            VALIDATORS.put(AUTO_TIME, AUTO_TIME_VALIDATOR);
            VALIDATORS.put(AUTO_TIME_ZONE, AUTO_TIME_ZONE_VALIDATOR);
            VALIDATORS.put(SHOW_GTALK_SERVICE_STATUS, SHOW_GTALK_SERVICE_STATUS_VALIDATOR);
            VALIDATORS.put(WALLPAPER_ACTIVITY, WALLPAPER_ACTIVITY_VALIDATOR);
            VALIDATORS.put(TIME_12_24, TIME_12_24_VALIDATOR);
            VALIDATORS.put(DATE_FORMAT, DATE_FORMAT_VALIDATOR);
            VALIDATORS.put(SETUP_WIZARD_HAS_RUN, SETUP_WIZARD_HAS_RUN_VALIDATOR);
            VALIDATORS.put(ACCELEROMETER_ROTATION, ACCELEROMETER_ROTATION_VALIDATOR);
            VALIDATORS.put(USER_ROTATION, USER_ROTATION_VALIDATOR);
            VALIDATORS.put(DTMF_TONE_WHEN_DIALING, DTMF_TONE_WHEN_DIALING_VALIDATOR);
            VALIDATORS.put(SOUND_EFFECTS_ENABLED, SOUND_EFFECTS_ENABLED_VALIDATOR);
            VALIDATORS.put(HAPTIC_FEEDBACK_ENABLED, HAPTIC_FEEDBACK_ENABLED_VALIDATOR);
            VALIDATORS.put(POWER_SOUNDS_ENABLED, POWER_SOUNDS_ENABLED_VALIDATOR);
            VALIDATORS.put(DOCK_SOUNDS_ENABLED, DOCK_SOUNDS_ENABLED_VALIDATOR);
            VALIDATORS.put(SHOW_WEB_SUGGESTIONS, SHOW_WEB_SUGGESTIONS_VALIDATOR);
            VALIDATORS.put(WIFI_USE_STATIC_IP, WIFI_USE_STATIC_IP_VALIDATOR);
            VALIDATORS.put(END_BUTTON_BEHAVIOR, END_BUTTON_BEHAVIOR_VALIDATOR);
            VALIDATORS.put(ADVANCED_SETTINGS, ADVANCED_SETTINGS_VALIDATOR);
            VALIDATORS.put(SCREEN_AUTO_BRIGHTNESS_ADJ, SCREEN_AUTO_BRIGHTNESS_ADJ_VALIDATOR);
            VALIDATORS.put(VIBRATE_INPUT_DEVICES, VIBRATE_INPUT_DEVICES_VALIDATOR);
            VALIDATORS.put(MASTER_MONO, MASTER_MONO_VALIDATOR);
            VALIDATORS.put(NOTIFICATIONS_USE_RING_VOLUME, NOTIFICATIONS_USE_RING_VOLUME_VALIDATOR);
            VALIDATORS.put(VIBRATE_IN_SILENT, VIBRATE_IN_SILENT_VALIDATOR);
            VALIDATORS.put(MEDIA_BUTTON_RECEIVER, MEDIA_BUTTON_RECEIVER_VALIDATOR);
            VALIDATORS.put(HIDE_ROTATION_LOCK_TOGGLE_FOR_ACCESSIBILITY,
                    HIDE_ROTATION_LOCK_TOGGLE_FOR_ACCESSIBILITY_VALIDATOR);
            VALIDATORS.put(VIBRATE_WHEN_RINGING, VIBRATE_WHEN_RINGING_VALIDATOR);
            VALIDATORS.put(DTMF_TONE_TYPE_WHEN_DIALING, DTMF_TONE_TYPE_WHEN_DIALING_VALIDATOR);
            VALIDATORS.put(HEARING_AID, HEARING_AID_VALIDATOR);
            VALIDATORS.put(TTY_MODE, TTY_MODE_VALIDATOR);
            VALIDATORS.put(RTT_CALLING_MODE, RTT_CALLING_MODE_VALIDATOR);
            VALIDATORS.put(NOTIFICATION_LIGHT_PULSE, NOTIFICATION_LIGHT_PULSE_VALIDATOR);
            VALIDATORS.put(POINTER_LOCATION, POINTER_LOCATION_VALIDATOR);
            VALIDATORS.put(SHOW_TOUCHES, SHOW_TOUCHES_VALIDATOR);
            VALIDATORS.put(WINDOW_ORIENTATION_LISTENER_LOG,
                    WINDOW_ORIENTATION_LISTENER_LOG_VALIDATOR);
            VALIDATORS.put(LOCKSCREEN_SOUNDS_ENABLED, LOCKSCREEN_SOUNDS_ENABLED_VALIDATOR);
            VALIDATORS.put(LOCKSCREEN_DISABLED, LOCKSCREEN_DISABLED_VALIDATOR);
            VALIDATORS.put(SIP_RECEIVE_CALLS, SIP_RECEIVE_CALLS_VALIDATOR);
            VALIDATORS.put(SIP_CALL_OPTIONS, SIP_CALL_OPTIONS_VALIDATOR);
            VALIDATORS.put(SIP_ALWAYS, SIP_ALWAYS_VALIDATOR);
            VALIDATORS.put(SIP_ADDRESS_ONLY, SIP_ADDRESS_ONLY_VALIDATOR);
            VALIDATORS.put(SIP_ASK_ME_EACH_TIME, SIP_ASK_ME_EACH_TIME_VALIDATOR);
            VALIDATORS.put(POINTER_SPEED, POINTER_SPEED_VALIDATOR);
            VALIDATORS.put(LOCK_TO_APP_ENABLED, LOCK_TO_APP_ENABLED_VALIDATOR);
            VALIDATORS.put(EGG_MODE, EGG_MODE_VALIDATOR);
            VALIDATORS.put(WIFI_STATIC_IP, WIFI_STATIC_IP_VALIDATOR);
            VALIDATORS.put(WIFI_STATIC_GATEWAY, WIFI_STATIC_GATEWAY_VALIDATOR);
            VALIDATORS.put(WIFI_STATIC_NETMASK, WIFI_STATIC_NETMASK_VALIDATOR);
            VALIDATORS.put(WIFI_STATIC_DNS1, WIFI_STATIC_DNS1_VALIDATOR);
            VALIDATORS.put(WIFI_STATIC_DNS2, WIFI_STATIC_DNS2_VALIDATOR);
            VALIDATORS.put(SHOW_BATTERY_PERCENT, SHOW_BATTERY_PERCENT_VALIDATOR);
        }

        /**
         * These entries are considered common between the personal and the managed profile,
         * since the managed profile doesn't get to change them.
         */
        private static final Set<String> CLONE_TO_MANAGED_PROFILE = new ArraySet<>();
        static {
            CLONE_TO_MANAGED_PROFILE.add(DATE_FORMAT);
            CLONE_TO_MANAGED_PROFILE.add(HAPTIC_FEEDBACK_ENABLED);
            CLONE_TO_MANAGED_PROFILE.add(SOUND_EFFECTS_ENABLED);
            CLONE_TO_MANAGED_PROFILE.add(TEXT_SHOW_PASSWORD);
            CLONE_TO_MANAGED_PROFILE.add(TIME_12_24);
        }

        /** @hide */
        public static void getCloneToManagedProfileSettings(Set<String> outKeySet) {
            outKeySet.addAll(CLONE_TO_MANAGED_PROFILE);
        }

        /**
         * These entries should be cloned from this profile's parent only if the dependency's
         * value is true ("1")
         *
         * Note: the dependencies must be Secure settings
         *
         * @hide
         */
        public static final Map<String, String> CLONE_FROM_PARENT_ON_VALUE = new ArrayMap<>();
        static {
            CLONE_FROM_PARENT_ON_VALUE.put(RINGTONE, Secure.SYNC_PARENT_SOUNDS);
            CLONE_FROM_PARENT_ON_VALUE.put(NOTIFICATION_SOUND, Secure.SYNC_PARENT_SOUNDS);
            CLONE_FROM_PARENT_ON_VALUE.put(ALARM_ALERT, Secure.SYNC_PARENT_SOUNDS);
        }

        /** @hide */
        public static void getCloneFromParentOnValueSettings(Map<String, String> outMap) {
            outMap.putAll(CLONE_FROM_PARENT_ON_VALUE);
        }

        /**
         * System settings which can be accessed by instant apps.
         * @hide
         */
        public static final Set<String> INSTANT_APP_SETTINGS = new ArraySet<>();
        static {
            INSTANT_APP_SETTINGS.add(TEXT_AUTO_REPLACE);
            INSTANT_APP_SETTINGS.add(TEXT_AUTO_CAPS);
            INSTANT_APP_SETTINGS.add(TEXT_AUTO_PUNCTUATE);
            INSTANT_APP_SETTINGS.add(TEXT_SHOW_PASSWORD);
            INSTANT_APP_SETTINGS.add(DATE_FORMAT);
            INSTANT_APP_SETTINGS.add(FONT_SCALE);
            INSTANT_APP_SETTINGS.add(HAPTIC_FEEDBACK_ENABLED);
            INSTANT_APP_SETTINGS.add(TIME_12_24);
            INSTANT_APP_SETTINGS.add(SOUND_EFFECTS_ENABLED);
            INSTANT_APP_SETTINGS.add(ACCELEROMETER_ROTATION);
        }

        /**
         * When to use Wi-Fi calling
         *
         * @see android.telephony.TelephonyManager.WifiCallingChoices
         * @hide
         */
        public static final String WHEN_TO_MAKE_WIFI_CALLS = "when_to_make_wifi_calls";

        // Settings moved to Settings.Secure

        /**
         * @deprecated Use {@link android.provider.Settings.Global#ADB_ENABLED}
         * instead
         */
        @Deprecated
        public static final String ADB_ENABLED = Global.ADB_ENABLED;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#ANDROID_ID} instead
         */
        @Deprecated
        public static final String ANDROID_ID = Secure.ANDROID_ID;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#BLUETOOTH_ON} instead
         */
        @Deprecated
        public static final String BLUETOOTH_ON = Global.BLUETOOTH_ON;

        private static final Validator BLUETOOTH_ON_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DATA_ROAMING} instead
         */
        @Deprecated
        public static final String DATA_ROAMING = Global.DATA_ROAMING;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DEVICE_PROVISIONED} instead
         */
        @Deprecated
        public static final String DEVICE_PROVISIONED = Global.DEVICE_PROVISIONED;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#HTTP_PROXY} instead
         */
        @Deprecated
        public static final String HTTP_PROXY = Global.HTTP_PROXY;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#INSTALL_NON_MARKET_APPS} instead
         */
        @Deprecated
        public static final String INSTALL_NON_MARKET_APPS = Secure.INSTALL_NON_MARKET_APPS;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#LOCATION_PROVIDERS_ALLOWED}
         * instead
         */
        @Deprecated
        public static final String LOCATION_PROVIDERS_ALLOWED = Secure.LOCATION_PROVIDERS_ALLOWED;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#LOGGING_ID} instead
         */
        @Deprecated
        public static final String LOGGING_ID = Secure.LOGGING_ID;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#NETWORK_PREFERENCE} instead
         */
        @Deprecated
        public static final String NETWORK_PREFERENCE = Global.NETWORK_PREFERENCE;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#PARENTAL_CONTROL_ENABLED}
         * instead
         */
        @Deprecated
        public static final String PARENTAL_CONTROL_ENABLED = Secure.PARENTAL_CONTROL_ENABLED;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#PARENTAL_CONTROL_LAST_UPDATE}
         * instead
         */
        @Deprecated
        public static final String PARENTAL_CONTROL_LAST_UPDATE = Secure.PARENTAL_CONTROL_LAST_UPDATE;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#PARENTAL_CONTROL_REDIRECT_URL}
         * instead
         */
        @Deprecated
        public static final String PARENTAL_CONTROL_REDIRECT_URL =
            Secure.PARENTAL_CONTROL_REDIRECT_URL;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#SETTINGS_CLASSNAME} instead
         */
        @Deprecated
        public static final String SETTINGS_CLASSNAME = Secure.SETTINGS_CLASSNAME;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#USB_MASS_STORAGE_ENABLED} instead
         */
        @Deprecated
        public static final String USB_MASS_STORAGE_ENABLED = Global.USB_MASS_STORAGE_ENABLED;

        private static final Validator USB_MASS_STORAGE_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#USE_GOOGLE_MAIL} instead
         */
        @Deprecated
        public static final String USE_GOOGLE_MAIL = Global.USE_GOOGLE_MAIL;

       /**
         * @deprecated Use
         * {@link android.provider.Settings.Global#WIFI_MAX_DHCP_RETRY_COUNT} instead
         */
        @Deprecated
        public static final String WIFI_MAX_DHCP_RETRY_COUNT = Global.WIFI_MAX_DHCP_RETRY_COUNT;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Global#WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS} instead
         */
        @Deprecated
        public static final String WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS =
                Global.WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Global#WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON} instead
         */
        @Deprecated
        public static final String WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON =
                Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON;

        private static final Validator WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Global#WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY} instead
         */
        @Deprecated
        public static final String WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY =
                Global.WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY;

        private static final Validator WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_NUM_OPEN_NETWORKS_KEPT}
         * instead
         */
        @Deprecated
        public static final String WIFI_NUM_OPEN_NETWORKS_KEPT = Global.WIFI_NUM_OPEN_NETWORKS_KEPT;

        private static final Validator WIFI_NUM_OPEN_NETWORKS_KEPT_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_ON} instead
         */
        @Deprecated
        public static final String WIFI_ON = Global.WIFI_ON;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Secure#WIFI_WATCHDOG_ACCEPTABLE_PACKET_LOSS_PERCENTAGE}
         * instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_ACCEPTABLE_PACKET_LOSS_PERCENTAGE =
                Secure.WIFI_WATCHDOG_ACCEPTABLE_PACKET_LOSS_PERCENTAGE;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#WIFI_WATCHDOG_AP_COUNT} instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_AP_COUNT = Secure.WIFI_WATCHDOG_AP_COUNT;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Secure#WIFI_WATCHDOG_BACKGROUND_CHECK_DELAY_MS} instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_BACKGROUND_CHECK_DELAY_MS =
                Secure.WIFI_WATCHDOG_BACKGROUND_CHECK_DELAY_MS;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Secure#WIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED} instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED =
                Secure.WIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Secure#WIFI_WATCHDOG_BACKGROUND_CHECK_TIMEOUT_MS}
         * instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_BACKGROUND_CHECK_TIMEOUT_MS =
                Secure.WIFI_WATCHDOG_BACKGROUND_CHECK_TIMEOUT_MS;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Secure#WIFI_WATCHDOG_INITIAL_IGNORED_PING_COUNT} instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_INITIAL_IGNORED_PING_COUNT =
            Secure.WIFI_WATCHDOG_INITIAL_IGNORED_PING_COUNT;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#WIFI_WATCHDOG_MAX_AP_CHECKS}
         * instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_MAX_AP_CHECKS = Secure.WIFI_WATCHDOG_MAX_AP_CHECKS;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_WATCHDOG_ON} instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_ON = Global.WIFI_WATCHDOG_ON;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#WIFI_WATCHDOG_PING_COUNT} instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_PING_COUNT = Secure.WIFI_WATCHDOG_PING_COUNT;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#WIFI_WATCHDOG_PING_DELAY_MS}
         * instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_PING_DELAY_MS = Secure.WIFI_WATCHDOG_PING_DELAY_MS;

        /**
         * @deprecated Use {@link android.provider.Settings.Secure#WIFI_WATCHDOG_PING_TIMEOUT_MS}
         * instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_PING_TIMEOUT_MS =
            Secure.WIFI_WATCHDOG_PING_TIMEOUT_MS;

        /**
         * Checks if the specified app can modify system settings. As of API
         * level 23, an app cannot modify system settings unless it declares the
         * {@link android.Manifest.permission#WRITE_SETTINGS}
         * permission in its manifest, <em>and</em> the user specifically grants
         * the app this capability. To prompt the user to grant this approval,
         * the app must send an intent with the action {@link
         * android.provider.Settings#ACTION_MANAGE_WRITE_SETTINGS}, which causes
         * the system to display a permission management screen.
         *
         * @param context App context.
         * @return true if the calling app can write to system settings, false otherwise
         */
        public static boolean canWrite(Context context) {
            return isCallingPackageAllowedToWriteSettings(context, Process.myUid(),
                    context.getOpPackageName(), false);
        }
    }

    /**
     * Secure system settings, containing system preferences that applications
     * can read but are not allowed to write.  These are for preferences that
     * the user must explicitly modify through the system UI or specialized
     * APIs for those values, not modified directly by applications.
     */
    public static final class Secure extends NameValueTable {
        // NOTE: If you add new settings here, be sure to add them to
        // com.android.providers.settings.SettingsProtoDumpUtil#dumpProtoSecureSettingsLocked.

        /**
         * The content:// style URL for this table
         */
        public static final Uri CONTENT_URI =
            Uri.parse("content://" + AUTHORITY + "/secure");

        private static final ContentProviderHolder sProviderHolder =
                new ContentProviderHolder(CONTENT_URI);

        // Populated lazily, guarded by class object:
        private static final NameValueCache sNameValueCache = new NameValueCache(
                CONTENT_URI,
                CALL_METHOD_GET_SECURE,
                CALL_METHOD_PUT_SECURE,
                sProviderHolder);

        private static ILockSettings sLockSettings = null;

        private static boolean sIsSystemProcess;
        private static final HashSet<String> MOVED_TO_LOCK_SETTINGS;
        private static final HashSet<String> MOVED_TO_GLOBAL;
        static {
            MOVED_TO_LOCK_SETTINGS = new HashSet<>(3);
            MOVED_TO_LOCK_SETTINGS.add(Secure.LOCK_PATTERN_ENABLED);
            MOVED_TO_LOCK_SETTINGS.add(Secure.LOCK_PATTERN_VISIBLE);
            MOVED_TO_LOCK_SETTINGS.add(Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED);

            MOVED_TO_GLOBAL = new HashSet<>();
            MOVED_TO_GLOBAL.add(Settings.Global.ADB_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.ASSISTED_GPS_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.BLUETOOTH_ON);
            MOVED_TO_GLOBAL.add(Settings.Global.BUGREPORT_IN_POWER_MENU);
            MOVED_TO_GLOBAL.add(Settings.Global.CDMA_CELL_BROADCAST_SMS);
            MOVED_TO_GLOBAL.add(Settings.Global.CDMA_ROAMING_MODE);
            MOVED_TO_GLOBAL.add(Settings.Global.CDMA_SUBSCRIPTION_MODE);
            MOVED_TO_GLOBAL.add(Settings.Global.DATA_ACTIVITY_TIMEOUT_MOBILE);
            MOVED_TO_GLOBAL.add(Settings.Global.DATA_ACTIVITY_TIMEOUT_WIFI);
            MOVED_TO_GLOBAL.add(Settings.Global.DATA_ROAMING);
            MOVED_TO_GLOBAL.add(Settings.Global.DEVELOPMENT_SETTINGS_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.DEVICE_PROVISIONED);
            MOVED_TO_GLOBAL.add(Settings.Global.DISPLAY_SIZE_FORCED);
            MOVED_TO_GLOBAL.add(Settings.Global.DOWNLOAD_MAX_BYTES_OVER_MOBILE);
            MOVED_TO_GLOBAL.add(Settings.Global.DOWNLOAD_RECOMMENDED_MAX_BYTES_OVER_MOBILE);
            MOVED_TO_GLOBAL.add(Settings.Global.MOBILE_DATA);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_DEV_BUCKET_DURATION);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_DEV_DELETE_AGE);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_DEV_PERSIST_BYTES);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_DEV_ROTATE_AGE);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_GLOBAL_ALERT_BYTES);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_POLL_INTERVAL);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_SAMPLE_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_TIME_CACHE_MAX_AGE);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_BUCKET_DURATION);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_DELETE_AGE);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_PERSIST_BYTES);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_ROTATE_AGE);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_TAG_BUCKET_DURATION);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_TAG_DELETE_AGE);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_TAG_PERSIST_BYTES);
            MOVED_TO_GLOBAL.add(Settings.Global.NETSTATS_UID_TAG_ROTATE_AGE);
            MOVED_TO_GLOBAL.add(Settings.Global.NETWORK_PREFERENCE);
            MOVED_TO_GLOBAL.add(Settings.Global.NITZ_UPDATE_DIFF);
            MOVED_TO_GLOBAL.add(Settings.Global.NITZ_UPDATE_SPACING);
            MOVED_TO_GLOBAL.add(Settings.Global.NTP_SERVER);
            MOVED_TO_GLOBAL.add(Settings.Global.NTP_TIMEOUT);
            MOVED_TO_GLOBAL.add(Settings.Global.PDP_WATCHDOG_ERROR_POLL_COUNT);
            MOVED_TO_GLOBAL.add(Settings.Global.PDP_WATCHDOG_LONG_POLL_INTERVAL_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.PDP_WATCHDOG_MAX_PDP_RESET_FAIL_COUNT);
            MOVED_TO_GLOBAL.add(Settings.Global.PDP_WATCHDOG_POLL_INTERVAL_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.PDP_WATCHDOG_TRIGGER_PACKET_COUNT);
            MOVED_TO_GLOBAL.add(Settings.Global.SETUP_PREPAID_DATA_SERVICE_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.SETUP_PREPAID_DETECTION_REDIR_HOST);
            MOVED_TO_GLOBAL.add(Settings.Global.SETUP_PREPAID_DETECTION_TARGET_URL);
            MOVED_TO_GLOBAL.add(Settings.Global.TETHER_DUN_APN);
            MOVED_TO_GLOBAL.add(Settings.Global.TETHER_DUN_REQUIRED);
            MOVED_TO_GLOBAL.add(Settings.Global.TETHER_SUPPORTED);
            MOVED_TO_GLOBAL.add(Settings.Global.USB_MASS_STORAGE_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.USE_GOOGLE_MAIL);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_COUNTRY_CODE);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_FRAMEWORK_SCAN_INTERVAL_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_FREQUENCY_BAND);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_IDLE_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_MAX_DHCP_RETRY_COUNT);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_NUM_OPEN_NETWORKS_KEPT);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_ON);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_P2P_DEVICE_NAME);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_SAVED_STATE);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_SUPPLICANT_SCAN_INTERVAL_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_VERBOSE_LOGGING_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_ENHANCED_AUTO_JOIN);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_NETWORK_SHOW_RSSI);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_WATCHDOG_ON);
            MOVED_TO_GLOBAL.add(Settings.Global.WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.WIMAX_NETWORKS_AVAILABLE_NOTIFICATION_ON);
            MOVED_TO_GLOBAL.add(Settings.Global.PACKAGE_VERIFIER_ENABLE);
            MOVED_TO_GLOBAL.add(Settings.Global.PACKAGE_VERIFIER_TIMEOUT);
            MOVED_TO_GLOBAL.add(Settings.Global.PACKAGE_VERIFIER_DEFAULT_RESPONSE);
            MOVED_TO_GLOBAL.add(Settings.Global.DATA_STALL_ALARM_NON_AGGRESSIVE_DELAY_IN_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.DATA_STALL_ALARM_AGGRESSIVE_DELAY_IN_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.GPRS_REGISTER_CHECK_PERIOD_MS);
            MOVED_TO_GLOBAL.add(Settings.Global.WTF_IS_FATAL);
            MOVED_TO_GLOBAL.add(Settings.Global.BATTERY_DISCHARGE_DURATION_THRESHOLD);
            MOVED_TO_GLOBAL.add(Settings.Global.BATTERY_DISCHARGE_THRESHOLD);
            MOVED_TO_GLOBAL.add(Settings.Global.SEND_ACTION_APP_ERROR);
            MOVED_TO_GLOBAL.add(Settings.Global.DROPBOX_AGE_SECONDS);
            MOVED_TO_GLOBAL.add(Settings.Global.DROPBOX_MAX_FILES);
            MOVED_TO_GLOBAL.add(Settings.Global.DROPBOX_QUOTA_KB);
            MOVED_TO_GLOBAL.add(Settings.Global.DROPBOX_QUOTA_PERCENT);
            MOVED_TO_GLOBAL.add(Settings.Global.DROPBOX_RESERVE_PERCENT);
            MOVED_TO_GLOBAL.add(Settings.Global.DROPBOX_TAG_PREFIX);
            MOVED_TO_GLOBAL.add(Settings.Global.ERROR_LOGCAT_PREFIX);
            MOVED_TO_GLOBAL.add(Settings.Global.SYS_FREE_STORAGE_LOG_INTERVAL);
            MOVED_TO_GLOBAL.add(Settings.Global.DISK_FREE_CHANGE_REPORTING_THRESHOLD);
            MOVED_TO_GLOBAL.add(Settings.Global.SYS_STORAGE_THRESHOLD_PERCENTAGE);
            MOVED_TO_GLOBAL.add(Settings.Global.SYS_STORAGE_THRESHOLD_MAX_BYTES);
            MOVED_TO_GLOBAL.add(Settings.Global.SYS_STORAGE_FULL_THRESHOLD_BYTES);
            MOVED_TO_GLOBAL.add(Settings.Global.SYNC_MAX_RETRY_DELAY_IN_SECONDS);
            MOVED_TO_GLOBAL.add(Settings.Global.CONNECTIVITY_CHANGE_DELAY);
            MOVED_TO_GLOBAL.add(Settings.Global.CAPTIVE_PORTAL_DETECTION_ENABLED);
            MOVED_TO_GLOBAL.add(Settings.Global.CAPTIVE_PORTAL_SERVER);
            MOVED_TO_GLOBAL.add(Settings.Global.NSD_ON);
            MOVED_TO_GLOBAL.add(Settings.Global.SET_INSTALL_LOCATION);
            MOVED_TO_GLOBAL.add(Settings.Global.DEFAULT_INSTALL_LOCATION);
            MOVED_TO_GLOBAL.add(Settings.Global.INET_CONDITION_DEBOUNCE_UP_DELAY);
            MOVED_TO_GLOBAL.add(Settings.Global.INET_CONDITION_DEBOUNCE_DOWN_DELAY);
            MOVED_TO_GLOBAL.add(Settings.Global.READ_EXTERNAL_STORAGE_ENFORCED_DEFAULT);
            MOVED_TO_GLOBAL.add(Settings.Global.HTTP_PROXY);
            MOVED_TO_GLOBAL.add(Settings.Global.GLOBAL_HTTP_PROXY_HOST);
            MOVED_TO_GLOBAL.add(Settings.Global.GLOBAL_HTTP_PROXY_PORT);
            MOVED_TO_GLOBAL.add(Settings.Global.GLOBAL_HTTP_PROXY_EXCLUSION_LIST);
            MOVED_TO_GLOBAL.add(Settings.Global.SET_GLOBAL_HTTP_PROXY);
            MOVED_TO_GLOBAL.add(Settings.Global.DEFAULT_DNS_SERVER);
            MOVED_TO_GLOBAL.add(Settings.Global.PREFERRED_NETWORK_MODE);
            MOVED_TO_GLOBAL.add(Settings.Global.WEBVIEW_DATA_REDUCTION_PROXY_KEY);
        }

        /** @hide */
        public static void getMovedToGlobalSettings(Set<String> outKeySet) {
            outKeySet.addAll(MOVED_TO_GLOBAL);
        }

        /** @hide */
        public static void clearProviderForTest() {
            sProviderHolder.clearProviderForTest();
            sNameValueCache.clearGenerationTrackerForTest();
        }

        /**
         * Look up a name in the database.
         * @param resolver to access the database with
         * @param name to look up in the table
         * @return the corresponding value, or null if not present
         */
        public static String getString(ContentResolver resolver, String name) {
            return getStringForUser(resolver, name, resolver.getUserId());
        }

        /** @hide */
        public static String getStringForUser(ContentResolver resolver, String name,
                int userHandle) {
            if (MOVED_TO_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.Secure"
                        + " to android.provider.Settings.Global.");
                return Global.getStringForUser(resolver, name, userHandle);
            }

            if (MOVED_TO_LOCK_SETTINGS.contains(name)) {
                synchronized (Secure.class) {
                    if (sLockSettings == null) {
                        sLockSettings = ILockSettings.Stub.asInterface(
                                (IBinder) ServiceManager.getService("lock_settings"));
                        sIsSystemProcess = Process.myUid() == Process.SYSTEM_UID;
                    }
                }
                if (sLockSettings != null && !sIsSystemProcess) {
                    // No context; use the ActivityThread's context as an approximation for
                    // determining the target API level.
                    Application application = ActivityThread.currentApplication();

                    boolean isPreMnc = application != null
                            && application.getApplicationInfo() != null
                            && application.getApplicationInfo().targetSdkVersion
                            <= VERSION_CODES.LOLLIPOP_MR1;
                    if (isPreMnc) {
                        try {
                            return sLockSettings.getString(name, "0", userHandle);
                        } catch (RemoteException re) {
                            // Fall through
                        }
                    } else {
                        throw new SecurityException("Settings.Secure." + name
                                + " is deprecated and no longer accessible."
                                + " See API documentation for potential replacements.");
                    }
                }
            }

            return sNameValueCache.getStringForUser(resolver, name, userHandle);
        }

        /**
         * Store a name/value pair into the database.
         * @param resolver to access the database with
         * @param name to store
         * @param value to associate with the name
         * @return true if the value was set, false on database errors
         */
        public static boolean putString(ContentResolver resolver, String name, String value) {
            return putStringForUser(resolver, name, value, resolver.getUserId());
        }

        /** @hide */
        public static boolean putStringForUser(ContentResolver resolver, String name, String value,
                int userHandle) {
            return putStringForUser(resolver, name, value, null, false, userHandle);
        }

        /** @hide */
        public static boolean putStringForUser(@NonNull ContentResolver resolver,
                @NonNull String name, @Nullable String value, @Nullable String tag,
                boolean makeDefault, @UserIdInt int userHandle) {
            if (LOCATION_MODE.equals(name)) {
                // Map LOCATION_MODE to underlying location provider storage API
                return setLocationModeForUser(resolver, Integer.parseInt(value), userHandle);
            }
            if (MOVED_TO_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.Secure"
                        + " to android.provider.Settings.Global");
                return Global.putStringForUser(resolver, name, value,
                        tag, makeDefault, userHandle);
            }
            return sNameValueCache.putStringForUser(resolver, name, value, tag,
                    makeDefault, userHandle);
        }

        /**
         * Store a name/value pair into the database.
         * <p>
         * The method takes an optional tag to associate with the setting
         * which can be used to clear only settings made by your package and
         * associated with this tag by passing the tag to {@link
         * #resetToDefaults(ContentResolver, String)}. Anyone can override
         * the current tag. Also if another package changes the setting
         * then the tag will be set to the one specified in the set call
         * which can be null. Also any of the settings setters that do not
         * take a tag as an argument effectively clears the tag.
         * </p><p>
         * For example, if you set settings A and B with tags T1 and T2 and
         * another app changes setting A (potentially to the same value), it
         * can assign to it a tag T3 (note that now the package that changed
         * the setting is not yours). Now if you reset your changes for T1 and
         * T2 only setting B will be reset and A not (as it was changed by
         * another package) but since A did not change you are in the desired
         * initial state. Now if the other app changes the value of A (assuming
         * you registered an observer in the beginning) you would detect that
         * the setting was changed by another app and handle this appropriately
         * (ignore, set back to some value, etc).
         * </p><p>
         * Also the method takes an argument whether to make the value the
         * default for this setting. If the system already specified a default
         * value, then the one passed in here will <strong>not</strong>
         * be set as the default.
         * </p>
         *
         * @param resolver to access the database with.
         * @param name to store.
         * @param value to associate with the name.
         * @param tag to associate with the setting.
         * @param makeDefault whether to make the value the default one.
         * @return true if the value was set, false on database errors.
         *
         * @see #resetToDefaults(ContentResolver, String)
         *
         * @hide
         */
        @SystemApi
        @RequiresPermission(Manifest.permission.WRITE_SECURE_SETTINGS)
        public static boolean putString(@NonNull ContentResolver resolver,
                @NonNull String name, @Nullable String value, @Nullable String tag,
                boolean makeDefault) {
            return putStringForUser(resolver, name, value, tag, makeDefault,
                    resolver.getUserId());
        }

        /**
         * Reset the settings to their defaults. This would reset <strong>only</strong>
         * settings set by the caller's package. Think of it of a way to undo your own
         * changes to the global settings. Passing in the optional tag will reset only
         * settings changed by your package and associated with this tag.
         *
         * @param resolver Handle to the content resolver.
         * @param tag Optional tag which should be associated with the settings to reset.
         *
         * @see #putString(ContentResolver, String, String, String, boolean)
         *
         * @hide
         */
        @SystemApi
        @RequiresPermission(Manifest.permission.WRITE_SECURE_SETTINGS)
        public static void resetToDefaults(@NonNull ContentResolver resolver,
                @Nullable String tag) {
            resetToDefaultsAsUser(resolver, tag, RESET_MODE_PACKAGE_DEFAULTS,
                    resolver.getUserId());
        }

        /**
         *
         * Reset the settings to their defaults for a given user with a specific mode. The
         * optional tag argument is valid only for {@link #RESET_MODE_PACKAGE_DEFAULTS}
         * allowing resetting the settings made by a package and associated with the tag.
         *
         * @param resolver Handle to the content resolver.
         * @param tag Optional tag which should be associated with the settings to reset.
         * @param mode The reset mode.
         * @param userHandle The user for which to reset to defaults.
         *
         * @see #RESET_MODE_PACKAGE_DEFAULTS
         * @see #RESET_MODE_UNTRUSTED_DEFAULTS
         * @see #RESET_MODE_UNTRUSTED_CHANGES
         * @see #RESET_MODE_TRUSTED_DEFAULTS
         *
         * @hide
         */
        public static void resetToDefaultsAsUser(@NonNull ContentResolver resolver,
                @Nullable String tag, @ResetMode int mode, @IntRange(from = 0) int userHandle) {
            try {
                Bundle arg = new Bundle();
                arg.putInt(CALL_METHOD_USER_KEY, userHandle);
                if (tag != null) {
                    arg.putString(CALL_METHOD_TAG_KEY, tag);
                }
                arg.putInt(CALL_METHOD_RESET_MODE_KEY, mode);
                IContentProvider cp = sProviderHolder.getProvider(resolver);
                cp.call(resolver.getPackageName(), CALL_METHOD_RESET_SECURE, null, arg);
            } catch (RemoteException e) {
                Log.w(TAG, "Can't reset do defaults for " + CONTENT_URI, e);
            }
        }

        /**
         * Construct the content URI for a particular name/value pair,
         * useful for monitoring changes with a ContentObserver.
         * @param name to look up in the table
         * @return the corresponding content URI, or null if not present
         */
        public static Uri getUriFor(String name) {
            if (MOVED_TO_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.Secure"
                        + " to android.provider.Settings.Global, returning global URI.");
                return Global.getUriFor(Global.CONTENT_URI, name);
            }
            return getUriFor(CONTENT_URI, name);
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as an integer.  Note that internally setting values are always
         * stored as strings; this function converts the string to an integer
         * for you.  The default value will be returned if the setting is
         * not defined or not an integer.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid integer.
         */
        public static int getInt(ContentResolver cr, String name, int def) {
            return getIntForUser(cr, name, def, cr.getUserId());
        }

        /** @hide */
        public static int getIntForUser(ContentResolver cr, String name, int def, int userHandle) {
            if (LOCATION_MODE.equals(name)) {
                // Map from to underlying location provider storage API to location mode
                return getLocationModeForUser(cr, userHandle);
            }
            String v = getStringForUser(cr, name, userHandle);
            try {
                return v != null ? Integer.parseInt(v) : def;
            } catch (NumberFormatException e) {
                return def;
            }
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as an integer.  Note that internally setting values are always
         * stored as strings; this function converts the string to an integer
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not an integer.
         *
         * @return The setting's current value.
         */
        public static int getInt(ContentResolver cr, String name)
                throws SettingNotFoundException {
            return getIntForUser(cr, name, cr.getUserId());
        }

        /** @hide */
        public static int getIntForUser(ContentResolver cr, String name, int userHandle)
                throws SettingNotFoundException {
            if (LOCATION_MODE.equals(name)) {
                // Map from to underlying location provider storage API to location mode
                return getLocationModeForUser(cr, userHandle);
            }
            String v = getStringForUser(cr, name, userHandle);
            try {
                return Integer.parseInt(v);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a single settings value as an
         * integer. This will either create a new entry in the table if the
         * given name does not exist, or modify the value of the existing row
         * with that name.  Note that internally setting values are always
         * stored as strings, so this function converts the given value to a
         * string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putInt(ContentResolver cr, String name, int value) {
            return putIntForUser(cr, name, value, cr.getUserId());
        }

        /** @hide */
        public static boolean putIntForUser(ContentResolver cr, String name, int value,
                int userHandle) {
            return putStringForUser(cr, name, Integer.toString(value), userHandle);
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a {@code long}.  Note that internally setting values are always
         * stored as strings; this function converts the string to a {@code long}
         * for you.  The default value will be returned if the setting is
         * not defined or not a {@code long}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid {@code long}.
         */
        public static long getLong(ContentResolver cr, String name, long def) {
            return getLongForUser(cr, name, def, cr.getUserId());
        }

        /** @hide */
        public static long getLongForUser(ContentResolver cr, String name, long def,
                int userHandle) {
            String valString = getStringForUser(cr, name, userHandle);
            long value;
            try {
                value = valString != null ? Long.parseLong(valString) : def;
            } catch (NumberFormatException e) {
                value = def;
            }
            return value;
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a {@code long}.  Note that internally setting values are always
         * stored as strings; this function converts the string to a {@code long}
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @return The setting's current value.
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not an integer.
         */
        public static long getLong(ContentResolver cr, String name)
                throws SettingNotFoundException {
            return getLongForUser(cr, name, cr.getUserId());
        }

        /** @hide */
        public static long getLongForUser(ContentResolver cr, String name, int userHandle)
                throws SettingNotFoundException {
            String valString = getStringForUser(cr, name, userHandle);
            try {
                return Long.parseLong(valString);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a secure settings value as a long
         * integer. This will either create a new entry in the table if the
         * given name does not exist, or modify the value of the existing row
         * with that name.  Note that internally setting values are always
         * stored as strings, so this function converts the given value to a
         * string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putLong(ContentResolver cr, String name, long value) {
            return putLongForUser(cr, name, value, cr.getUserId());
        }

        /** @hide */
        public static boolean putLongForUser(ContentResolver cr, String name, long value,
                int userHandle) {
            return putStringForUser(cr, name, Long.toString(value), userHandle);
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a floating point number.  Note that internally setting values are
         * always stored as strings; this function converts the string to an
         * float for you. The default value will be returned if the setting
         * is not defined or not a valid float.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid float.
         */
        public static float getFloat(ContentResolver cr, String name, float def) {
            return getFloatForUser(cr, name, def, cr.getUserId());
        }

        /** @hide */
        public static float getFloatForUser(ContentResolver cr, String name, float def,
                int userHandle) {
            String v = getStringForUser(cr, name, userHandle);
            try {
                return v != null ? Float.parseFloat(v) : def;
            } catch (NumberFormatException e) {
                return def;
            }
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a float.  Note that internally setting values are always
         * stored as strings; this function converts the string to a float
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not a float.
         *
         * @return The setting's current value.
         */
        public static float getFloat(ContentResolver cr, String name)
                throws SettingNotFoundException {
            return getFloatForUser(cr, name, cr.getUserId());
        }

        /** @hide */
        public static float getFloatForUser(ContentResolver cr, String name, int userHandle)
                throws SettingNotFoundException {
            String v = getStringForUser(cr, name, userHandle);
            if (v == null) {
                throw new SettingNotFoundException(name);
            }
            try {
                return Float.parseFloat(v);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a single settings value as a
         * floating point number. This will either create a new entry in the
         * table if the given name does not exist, or modify the value of the
         * existing row with that name.  Note that internally setting values
         * are always stored as strings, so this function converts the given
         * value to a string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putFloat(ContentResolver cr, String name, float value) {
            return putFloatForUser(cr, name, value, cr.getUserId());
        }

        /** @hide */
        public static boolean putFloatForUser(ContentResolver cr, String name, float value,
                int userHandle) {
            return putStringForUser(cr, name, Float.toString(value), userHandle);
        }

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DEVELOPMENT_SETTINGS_ENABLED}
         * instead
         */
        @Deprecated
        public static final String DEVELOPMENT_SETTINGS_ENABLED =
                Global.DEVELOPMENT_SETTINGS_ENABLED;

        /**
         * When the user has enable the option to have a "bug report" command
         * in the power menu.
         * @deprecated Use {@link android.provider.Settings.Global#BUGREPORT_IN_POWER_MENU} instead
         * @hide
         */
        @Deprecated
        public static final String BUGREPORT_IN_POWER_MENU = "bugreport_in_power_menu";

        private static final Validator BUGREPORT_IN_POWER_MENU_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#ADB_ENABLED} instead
         */
        @Deprecated
        public static final String ADB_ENABLED = Global.ADB_ENABLED;

        /**
         * Setting to allow mock locations and location provider status to be injected into the
         * LocationManager service for testing purposes during application development.  These
         * locations and status values  override actual location and status information generated
         * by network, gps, or other location providers.
         *
         * @deprecated This settings is not used anymore.
         */
        @Deprecated
        public static final String ALLOW_MOCK_LOCATION = "mock_location";

        private static final Validator ALLOW_MOCK_LOCATION_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * On Android 8.0 (API level 26) and higher versions of the platform,
         * a 64-bit number (expressed as a hexadecimal string), unique to
         * each combination of app-signing key, user, and device.
         * Values of {@code ANDROID_ID} are scoped by signing key and user.
         * The value may change if a factory reset is performed on the
         * device or if an APK signing key changes.
         *
         * For more information about how the platform handles {@code ANDROID_ID}
         * in Android 8.0 (API level 26) and higher, see <a
         * href="{@docRoot}preview/behavior-changes.html#privacy-all">
         * Android 8.0 Behavior Changes</a>.
         *
         * <p class="note"><strong>Note:</strong> For apps that were installed
         * prior to updating the device to a version of Android 8.0
         * (API level 26) or higher, the value of {@code ANDROID_ID} changes
         * if the app is uninstalled and then reinstalled after the OTA.
         * To preserve values across uninstalls after an OTA to Android 8.0
         * or higher, developers can use
         * <a href="{@docRoot}guide/topics/data/keyvaluebackup.html">
         * Key/Value Backup</a>.</p>
         *
         * <p>In versions of the platform lower than Android 8.0 (API level 26),
         * a 64-bit number (expressed as a hexadecimal string) that is randomly
         * generated when the user first sets up the device and should remain
         * constant for the lifetime of the user's device.
         *
         * On devices that have
         * <a href="{@docRoot}about/versions/android-4.2.html#MultipleUsers">
         * multiple users</a>, each user appears as a
         * completely separate device, so the {@code ANDROID_ID} value is
         * unique to each user.</p>
         *
         * <p class="note"><strong>Note:</strong> If the caller is an Instant App the ID is scoped
         * to the Instant App, it is generated when the Instant App is first installed and reset if
         * the user clears the Instant App.
         */
        public static final String ANDROID_ID = "android_id";

        /**
         * @deprecated Use {@link android.provider.Settings.Global#BLUETOOTH_ON} instead
         */
        @Deprecated
        public static final String BLUETOOTH_ON = Global.BLUETOOTH_ON;

        private static final Validator BLUETOOTH_ON_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DATA_ROAMING} instead
         */
        @Deprecated
        public static final String DATA_ROAMING = Global.DATA_ROAMING;

        /**
         * Setting to record the input method used by default, holding the ID
         * of the desired method.
         */
        public static final String DEFAULT_INPUT_METHOD = "default_input_method";

        /**
         * Setting to record the input method subtype used by default, holding the ID
         * of the desired method.
         */
        public static final String SELECTED_INPUT_METHOD_SUBTYPE =
                "selected_input_method_subtype";

        /**
         * Setting to record the history of input method subtype, holding the pair of ID of IME
         * and its last used subtype.
         * @hide
         */
        public static final String INPUT_METHODS_SUBTYPE_HISTORY =
                "input_methods_subtype_history";

        /**
         * Setting to record the visibility of input method selector
         */
        public static final String INPUT_METHOD_SELECTOR_VISIBILITY =
                "input_method_selector_visibility";

        /**
         * The currently selected voice interaction service flattened ComponentName.
         * @hide
         */
        @TestApi
        public static final String VOICE_INTERACTION_SERVICE = "voice_interaction_service";

        /**
         * The currently selected autofill service flattened ComponentName.
         * @hide
         */
        @TestApi
        public static final String AUTOFILL_SERVICE = "autofill_service";

        private static final Validator AUTOFILL_SERVICE_VALIDATOR = COMPONENT_NAME_VALIDATOR;

        /**
         * Boolean indicating if Autofill supports field classification.
         *
         * @see android.service.autofill.AutofillService
         *
         * @hide
         */
        @SystemApi
        @TestApi
        public static final String AUTOFILL_FEATURE_FIELD_CLASSIFICATION =
                "autofill_field_classification";

        /**
         * Defines value returned by {@link android.service.autofill.UserData#getMaxUserDataSize()}.
         *
         * @hide
         */
        @SystemApi
        @TestApi
        public static final String AUTOFILL_USER_DATA_MAX_USER_DATA_SIZE =
                "autofill_user_data_max_user_data_size";

        /**
         * Defines value returned by
         * {@link android.service.autofill.UserData#getMaxFieldClassificationIdsSize()}.
         *
         * @hide
         */
        @SystemApi
        @TestApi
        public static final String AUTOFILL_USER_DATA_MAX_FIELD_CLASSIFICATION_IDS_SIZE =
                "autofill_user_data_max_field_classification_size";

        /**
         * Defines value returned by
         * {@link android.service.autofill.UserData#getMaxCategoryCount()}.
         *
         * @hide
         */
        @SystemApi
        @TestApi
        public static final String AUTOFILL_USER_DATA_MAX_CATEGORY_COUNT =
                "autofill_user_data_max_category_count";

        /**
         * Defines value returned by {@link android.service.autofill.UserData#getMaxValueLength()}.
         *
         * @hide
         */
        @SystemApi
        @TestApi
        public static final String AUTOFILL_USER_DATA_MAX_VALUE_LENGTH =
                "autofill_user_data_max_value_length";

        /**
         * Defines value returned by {@link android.service.autofill.UserData#getMinValueLength()}.
         *
         * @hide
         */
        @SystemApi
        @TestApi
        public static final String AUTOFILL_USER_DATA_MIN_VALUE_LENGTH =
                "autofill_user_data_min_value_length";

        /**
         * @deprecated Use {@link android.provider.Settings.Global#DEVICE_PROVISIONED} instead
         */
        @Deprecated
        public static final String DEVICE_PROVISIONED = Global.DEVICE_PROVISIONED;

        /**
         * Whether the current user has been set up via setup wizard (0 = false, 1 = true)
         * @hide
         */
        @TestApi
        public static final String USER_SETUP_COMPLETE = "user_setup_complete";

        /**
         * The current state of device personalization.
         *
         * @hide
         * @see UserSetupPersonalization
         */
        public static final String USER_SETUP_PERSONALIZATION_STATE =
                "user_setup_personalization_state";

        /**
         * Whether the current user has been set up via setup wizard (0 = false, 1 = true)
         * This value differs from USER_SETUP_COMPLETE in that it can be reset back to 0
         * in case SetupWizard has been re-enabled on TV devices.
         *
         * @hide
         */
        public static final String TV_USER_SETUP_COMPLETE = "tv_user_setup_complete";

        /**
         * Prefix for category name that marks whether a suggested action from that category was
         * completed.
         * @hide
         */
        public static final String COMPLETED_CATEGORY_PREFIX = "suggested.completed_category.";

        /**
         * List of input methods that are currently enabled.  This is a string
         * containing the IDs of all enabled input methods, each ID separated
         * by ':'.
         *
         * Format like "ime0;subtype0;subtype1;subtype2:ime1:ime2;subtype0"
         * where imeId is ComponentName and subtype is int32.
         */
        public static final String ENABLED_INPUT_METHODS = "enabled_input_methods";

        /**
         * List of system input methods that are currently disabled.  This is a string
         * containing the IDs of all disabled input methods, each ID separated
         * by ':'.
         * @hide
         */
        public static final String DISABLED_SYSTEM_INPUT_METHODS = "disabled_system_input_methods";

        /**
         * Whether to show the IME when a hard keyboard is connected. This is a boolean that
         * determines if the IME should be shown when a hard keyboard is attached.
         * @hide
         */
        public static final String SHOW_IME_WITH_HARD_KEYBOARD = "show_ime_with_hard_keyboard";

        private static final Validator SHOW_IME_WITH_HARD_KEYBOARD_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Host name and port for global http proxy. Uses ':' seperator for
         * between host and port.
         *
         * @deprecated Use {@link Global#HTTP_PROXY}
         */
        @Deprecated
        public static final String HTTP_PROXY = Global.HTTP_PROXY;

        /**
         * Package designated as always-on VPN provider.
         *
         * @hide
         */
        public static final String ALWAYS_ON_VPN_APP = "always_on_vpn_app";

        /**
         * Whether to block networking outside of VPN connections while always-on is set.
         * @see #ALWAYS_ON_VPN_APP
         *
         * @hide
         */
        public static final String ALWAYS_ON_VPN_LOCKDOWN = "always_on_vpn_lockdown";

        /**
         * Whether applications can be installed for this user via the system's
         * {@link Intent#ACTION_INSTALL_PACKAGE} mechanism.
         *
         * <p>1 = permit app installation via the system package installer intent
         * <p>0 = do not allow use of the package installer
         * @deprecated Starting from {@link android.os.Build.VERSION_CODES#O}, apps should use
         * {@link PackageManager#canRequestPackageInstalls()}
         * @see PackageManager#canRequestPackageInstalls()
         */
        public static final String INSTALL_NON_MARKET_APPS = "install_non_market_apps";

        /**
         * A flag to tell {@link com.android.server.devicepolicy.DevicePolicyManagerService} that
         * the default for {@link #INSTALL_NON_MARKET_APPS} is reversed for this user on OTA. So it
         * can set the restriction {@link android.os.UserManager#DISALLOW_INSTALL_UNKNOWN_SOURCES}
         * on behalf of the profile owner if needed to make the change transparent for profile
         * owners.
         *
         * @hide
         */
        public static final String UNKNOWN_SOURCES_DEFAULT_REVERSED =
                "unknown_sources_default_reversed";

        /**
         * Comma-separated list of location providers that activities may access. Do not rely on
         * this value being present in settings.db or on ContentObserver notifications on the
         * corresponding Uri.
         *
         * @deprecated use {@link #LOCATION_MODE} and
         * {@link LocationManager#MODE_CHANGED_ACTION} (or
         * {@link LocationManager#PROVIDERS_CHANGED_ACTION})
         */
        @Deprecated
        public static final String LOCATION_PROVIDERS_ALLOWED = "location_providers_allowed";

        /**
         * The degree of location access enabled by the user.
         * <p>
         * When used with {@link #putInt(ContentResolver, String, int)}, must be one of {@link
         * #LOCATION_MODE_HIGH_ACCURACY}, {@link #LOCATION_MODE_SENSORS_ONLY}, {@link
         * #LOCATION_MODE_BATTERY_SAVING}, or {@link #LOCATION_MODE_OFF}. When used with {@link
         * #getInt(ContentResolver, String)}, the caller must gracefully handle additional location
         * modes that might be added in the future.
         * <p>
         * Note: do not rely on this value being present in settings.db or on ContentObserver
         * notifications for the corresponding Uri. Use {@link LocationManager#MODE_CHANGED_ACTION}
         * to receive changes in this value.
         *
         * @deprecated To check location status, use {@link LocationManager#isLocationEnabled()}. To
         *             get the status of a location provider, use
         *             {@link LocationManager#isProviderEnabled(String)}.
         */
        @Deprecated
        public static final String LOCATION_MODE = "location_mode";

        /**
         * The App or module that changes the location mode.
         * @hide
         */
        public static final String LOCATION_CHANGER = "location_changer";
        /**
         * The location changer is unknown or unable to detect.
         * @hide
         */
        public static final int LOCATION_CHANGER_UNKNOWN = 0;
        /**
         * Location settings in system settings.
         * @hide
         */
        public static final int LOCATION_CHANGER_SYSTEM_SETTINGS = 1;
        /**
         * The location icon in drop down notification drawer.
         * @hide
         */
        public static final int LOCATION_CHANGER_QUICK_SETTINGS = 2;

        /**
         * Location access disabled.
         *
         * @deprecated To check location status, use {@link LocationManager#isLocationEnabled()}. To
         *             get the status of a location provider, use
         *             {@link LocationManager#isProviderEnabled(String)}.
         */
        @Deprecated
        public static final int LOCATION_MODE_OFF = 0;

        /**
         * Network Location Provider disabled, but GPS and other sensors enabled.
         *
         * @deprecated To check location status, use {@link LocationManager#isLocationEnabled()}. To
         *             get the status of a location provider, use
         *             {@link LocationManager#isProviderEnabled(String)}.
         */
        @Deprecated
        public static final int LOCATION_MODE_SENSORS_ONLY = 1;

        /**
         * Reduced power usage, such as limiting the number of GPS updates per hour. Requests
         * with {@link android.location.Criteria#POWER_HIGH} may be downgraded to
         * {@link android.location.Criteria#POWER_MEDIUM}.
         *
         * @deprecated To check location status, use {@link LocationManager#isLocationEnabled()}. To
         *             get the status of a location provider, use
         *             {@link LocationManager#isProviderEnabled(String)}.
         */
        @Deprecated
        public static final int LOCATION_MODE_BATTERY_SAVING = 2;

        /**
         * Best-effort location computation allowed.
         *
         * @deprecated To check location status, use {@link LocationManager#isLocationEnabled()}. To
         *             get the status of a location provider, use
         *             {@link LocationManager#isProviderEnabled(String)}.
         */
        @Deprecated
        public static final int LOCATION_MODE_HIGH_ACCURACY = 3;

        /**
         * A flag containing settings used for biometric weak
         * @hide
         */
        @Deprecated
        public static final String LOCK_BIOMETRIC_WEAK_FLAGS =
                "lock_biometric_weak_flags";

        /**
         * Whether lock-to-app will lock the keyguard when exiting.
         * @hide
         */
        public static final String LOCK_TO_APP_EXIT_LOCKED = "lock_to_app_exit_locked";

        /**
         * Whether autolock is enabled (0 = false, 1 = true)
         *
         * @deprecated Use {@link android.app.KeyguardManager} to determine the state and security
         *             level of the keyguard. Accessing this setting from an app that is targeting
         *             {@link VERSION_CODES#M} or later throws a {@code SecurityException}.
         */
        @Deprecated
        public static final String LOCK_PATTERN_ENABLED = "lock_pattern_autolock";

        /**
         * Whether lock pattern is visible as user enters (0 = false, 1 = true)
         *
         * @deprecated Accessing this setting from an app that is targeting
         *             {@link VERSION_CODES#M} or later throws a {@code SecurityException}.
         */
        @Deprecated
        public static final String LOCK_PATTERN_VISIBLE = "lock_pattern_visible_pattern";

        /**
         * Whether lock pattern will vibrate as user enters (0 = false, 1 =
         * true)
         *
         * @deprecated Starting in {@link VERSION_CODES#JELLY_BEAN_MR1} the
         *             lockscreen uses
         *             {@link Settings.System#HAPTIC_FEEDBACK_ENABLED}.
         *             Accessing this setting from an app that is targeting
         *             {@link VERSION_CODES#M} or later throws a {@code SecurityException}.
         */
        @Deprecated
        public static final String
                LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED = "lock_pattern_tactile_feedback_enabled";

        /**
         * This preference allows the device to be locked given time after screen goes off,
         * subject to current DeviceAdmin policy limits.
         * @hide
         */
        public static final String LOCK_SCREEN_LOCK_AFTER_TIMEOUT = "lock_screen_lock_after_timeout";


        /**
         * This preference contains the string that shows for owner info on LockScreen.
         * @hide
         * @deprecated
         */
        @Deprecated
        public static final String LOCK_SCREEN_OWNER_INFO = "lock_screen_owner_info";

        /**
         * Ids of the user-selected appwidgets on the lockscreen (comma-delimited).
         * @hide
         */
        @Deprecated
        public static final String LOCK_SCREEN_APPWIDGET_IDS =
            "lock_screen_appwidget_ids";

        /**
         * Id of the appwidget shown on the lock screen when appwidgets are disabled.
         * @hide
         */
        @Deprecated
        public static final String LOCK_SCREEN_FALLBACK_APPWIDGET_ID =
            "lock_screen_fallback_appwidget_id";

        /**
         * Index of the lockscreen appwidget to restore, -1 if none.
         * @hide
         */
        @Deprecated
        public static final String LOCK_SCREEN_STICKY_APPWIDGET =
            "lock_screen_sticky_appwidget";

        /**
         * This preference enables showing the owner info on LockScreen.
         * @hide
         * @deprecated
         */
        @Deprecated
        public static final String LOCK_SCREEN_OWNER_INFO_ENABLED =
            "lock_screen_owner_info_enabled";

        /**
         * When set by a user, allows notifications to be shown atop a securely locked screen
         * in their full "private" form (same as when the device is unlocked).
         * @hide
         */
        public static final String LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS =
                "lock_screen_allow_private_notifications";

        /**
         * When set by a user, allows notification remote input atop a securely locked screen
         * without having to unlock
         * @hide
         */
        public static final String LOCK_SCREEN_ALLOW_REMOTE_INPUT =
                "lock_screen_allow_remote_input";

        /**
         * Set by the system to track if the user needs to see the call to action for
         * the lockscreen notification policy.
         * @hide
         */
        public static final String SHOW_NOTE_ABOUT_NOTIFICATION_HIDING =
                "show_note_about_notification_hiding";

        /**
         * Set to 1 by the system after trust agents have been initialized.
         * @hide
         */
        public static final String TRUST_AGENTS_INITIALIZED =
                "trust_agents_initialized";

        /**
         * The Logging ID (a unique 64-bit value) as a hex string.
         * Used as a pseudonymous identifier for logging.
         * @deprecated This identifier is poorly initialized and has
         * many collisions.  It should not be used.
         */
        @Deprecated
        public static final String LOGGING_ID = "logging_id";

        /**
         * @deprecated Use {@link android.provider.Settings.Global#NETWORK_PREFERENCE} instead
         */
        @Deprecated
        public static final String NETWORK_PREFERENCE = Global.NETWORK_PREFERENCE;

        /**
         * No longer supported.
         */
        public static final String PARENTAL_CONTROL_ENABLED = "parental_control_enabled";

        /**
         * No longer supported.
         */
        public static final String PARENTAL_CONTROL_LAST_UPDATE = "parental_control_last_update";

        /**
         * No longer supported.
         */
        public static final String PARENTAL_CONTROL_REDIRECT_URL = "parental_control_redirect_url";

        /**
         * Settings classname to launch when Settings is clicked from All
         * Applications.  Needed because of user testing between the old
         * and new Settings apps.
         */
        // TODO: 881807
        public static final String SETTINGS_CLASSNAME = "settings_classname";

        /**
         * @deprecated Use {@link android.provider.Settings.Global#USB_MASS_STORAGE_ENABLED} instead
         */
        @Deprecated
        public static final String USB_MASS_STORAGE_ENABLED = Global.USB_MASS_STORAGE_ENABLED;

        private static final Validator USB_MASS_STORAGE_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#USE_GOOGLE_MAIL} instead
         */
        @Deprecated
        public static final String USE_GOOGLE_MAIL = Global.USE_GOOGLE_MAIL;

        /**
         * If accessibility is enabled.
         */
        public static final String ACCESSIBILITY_ENABLED = "accessibility_enabled";

        private static final Validator ACCESSIBILITY_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Setting specifying if the accessibility shortcut is enabled.
         * @hide
         */
        public static final String ACCESSIBILITY_SHORTCUT_ENABLED =
                "accessibility_shortcut_enabled";

        private static final Validator ACCESSIBILITY_SHORTCUT_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Setting specifying if the accessibility shortcut is enabled.
         * @hide
         */
        public static final String ACCESSIBILITY_SHORTCUT_ON_LOCK_SCREEN =
                "accessibility_shortcut_on_lock_screen";

        private static final Validator ACCESSIBILITY_SHORTCUT_ON_LOCK_SCREEN_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Setting specifying if the accessibility shortcut dialog has been shown to this user.
         * @hide
         */
        public static final String ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN =
                "accessibility_shortcut_dialog_shown";

        private static final Validator ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Setting specifying the accessibility service to be toggled via the accessibility
         * shortcut. Must be its flattened {@link ComponentName}.
         * @hide
         */
        public static final String ACCESSIBILITY_SHORTCUT_TARGET_SERVICE =
                "accessibility_shortcut_target_service";

        private static final Validator ACCESSIBILITY_SHORTCUT_TARGET_SERVICE_VALIDATOR =
                COMPONENT_NAME_VALIDATOR;

        /**
         * Setting specifying the accessibility service or feature to be toggled via the
         * accessibility button in the navigation bar. This is either a flattened
         * {@link ComponentName} or the class name of a system class implementing a supported
         * accessibility feature.
         * @hide
         */
        public static final String ACCESSIBILITY_BUTTON_TARGET_COMPONENT =
                "accessibility_button_target_component";

        private static final Validator ACCESSIBILITY_BUTTON_TARGET_COMPONENT_VALIDATOR =
                new Validator() {
                    @Override
                    public boolean validate(String value) {
                        // technically either ComponentName or class name, but there's proper value
                        // validation at callsites, so allow any non-null string
                        return value != null;
                    }
                };

        /**
         * If touch exploration is enabled.
         */
        public static final String TOUCH_EXPLORATION_ENABLED = "touch_exploration_enabled";

        private static final Validator TOUCH_EXPLORATION_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * List of the enabled accessibility providers.
         */
        public static final String ENABLED_ACCESSIBILITY_SERVICES =
            "enabled_accessibility_services";

        private static final Validator ENABLED_ACCESSIBILITY_SERVICES_VALIDATOR =
                new SettingsValidators.ComponentNameListValidator(":");

        /**
         * List of the accessibility services to which the user has granted
         * permission to put the device into touch exploration mode.
         *
         * @hide
         */
        public static final String TOUCH_EXPLORATION_GRANTED_ACCESSIBILITY_SERVICES =
            "touch_exploration_granted_accessibility_services";

        private static final Validator TOUCH_EXPLORATION_GRANTED_ACCESSIBILITY_SERVICES_VALIDATOR =
                new SettingsValidators.ComponentNameListValidator(":");

        /**
         * Uri of the slice that's presented on the keyguard.
         * Defaults to a slice with the date and next alarm.
         *
         * @hide
         */
        public static final String KEYGUARD_SLICE_URI = "keyguard_slice_uri";

        /**
         * Whether to speak passwords while in accessibility mode.
         *
         * @deprecated The speaking of passwords is controlled by individual accessibility services.
         * Apps should ignore this setting and provide complete information to accessibility
         * at all times, which was the behavior when this value was {@code true}.
         */
        @Deprecated
        public static final String ACCESSIBILITY_SPEAK_PASSWORD = "speak_password";

        private static final Validator ACCESSIBILITY_SPEAK_PASSWORD_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether to draw text with high contrast while in accessibility mode.
         *
         * @hide
         */
        public static final String ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED =
                "high_text_contrast_enabled";

        private static final Validator ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Setting that specifies whether the display magnification is enabled via a system-wide
         * triple tap gesture. Display magnifications allows the user to zoom in the display content
         * and is targeted to low vision users. The current magnification scale is controlled by
         * {@link #ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE}.
         *
         * @hide
         */
        @TestApi
        public static final String ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED =
                "accessibility_display_magnification_enabled";

        private static final Validator ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Setting that specifies whether the display magnification is enabled via a shortcut
         * affordance within the system's navigation area. Display magnifications allows the user to
         * zoom in the display content and is targeted to low vision users. The current
         * magnification scale is controlled by {@link #ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE}.
         *
         * @hide
         */
        public static final String ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED =
                "accessibility_display_magnification_navbar_enabled";

        private static final Validator ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED_VALIDATOR
                = BOOLEAN_VALIDATOR;

        /**
         * Setting that specifies what the display magnification scale is.
         * Display magnifications allows the user to zoom in the display
         * content and is targeted to low vision users. Whether a display
         * magnification is performed is controlled by
         * {@link #ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED} and
         * {@link #ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED}
         *
         * @hide
         */
        public static final String ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE =
                "accessibility_display_magnification_scale";

        private static final Validator ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE_VALIDATOR =
                new SettingsValidators.InclusiveFloatRangeValidator(1.0f, Float.MAX_VALUE);

        /**
         * Unused mangnification setting
         *
         * @hide
         * @deprecated
         */
        @Deprecated
        public static final String ACCESSIBILITY_DISPLAY_MAGNIFICATION_AUTO_UPDATE =
                "accessibility_display_magnification_auto_update";

        /**
         * Setting that specifies what mode the soft keyboard is in (default or hidden). Can be
         * modified from an AccessibilityService using the SoftKeyboardController.
         *
         * @hide
         */
        public static final String ACCESSIBILITY_SOFT_KEYBOARD_MODE =
                "accessibility_soft_keyboard_mode";

        /**
         * Default soft keyboard behavior.
         *
         * @hide
         */
        public static final int SHOW_MODE_AUTO = 0;

        /**
         * Soft keyboard is never shown.
         *
         * @hide
         */
        public static final int SHOW_MODE_HIDDEN = 1;

        /**
         * Setting that specifies whether timed text (captions) should be
         * displayed in video content. Text display properties are controlled by
         * the following settings:
         * <ul>
         * <li>{@link #ACCESSIBILITY_CAPTIONING_LOCALE}
         * <li>{@link #ACCESSIBILITY_CAPTIONING_BACKGROUND_COLOR}
         * <li>{@link #ACCESSIBILITY_CAPTIONING_FOREGROUND_COLOR}
         * <li>{@link #ACCESSIBILITY_CAPTIONING_EDGE_COLOR}
         * <li>{@link #ACCESSIBILITY_CAPTIONING_EDGE_TYPE}
         * <li>{@link #ACCESSIBILITY_CAPTIONING_TYPEFACE}
         * <li>{@link #ACCESSIBILITY_CAPTIONING_FONT_SCALE}
         * </ul>
         *
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_ENABLED =
                "accessibility_captioning_enabled";

        private static final Validator ACCESSIBILITY_CAPTIONING_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Setting that specifies the language for captions as a locale string,
         * e.g. en_US.
         *
         * @see java.util.Locale#toString
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_LOCALE =
                "accessibility_captioning_locale";

        private static final Validator ACCESSIBILITY_CAPTIONING_LOCALE_VALIDATOR = LOCALE_VALIDATOR;

        /**
         * Integer property that specifies the preset style for captions, one
         * of:
         * <ul>
         * <li>{@link android.view.accessibility.CaptioningManager.CaptionStyle#PRESET_CUSTOM}
         * <li>a valid index of {@link android.view.accessibility.CaptioningManager.CaptionStyle#PRESETS}
         * </ul>
         *
         * @see java.util.Locale#toString
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_PRESET =
                "accessibility_captioning_preset";

        private static final Validator ACCESSIBILITY_CAPTIONING_PRESET_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[]{"-1", "0", "1", "2",
                        "3", "4"});

        /**
         * Integer property that specifes the background color for captions as a
         * packed 32-bit color.
         *
         * @see android.graphics.Color#argb
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_BACKGROUND_COLOR =
                "accessibility_captioning_background_color";

        private static final Validator ACCESSIBILITY_CAPTIONING_BACKGROUND_COLOR_VALIDATOR =
                ANY_INTEGER_VALIDATOR;

        /**
         * Integer property that specifes the foreground color for captions as a
         * packed 32-bit color.
         *
         * @see android.graphics.Color#argb
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_FOREGROUND_COLOR =
                "accessibility_captioning_foreground_color";

        private static final Validator ACCESSIBILITY_CAPTIONING_FOREGROUND_COLOR_VALIDATOR =
                ANY_INTEGER_VALIDATOR;

        /**
         * Integer property that specifes the edge type for captions, one of:
         * <ul>
         * <li>{@link android.view.accessibility.CaptioningManager.CaptionStyle#EDGE_TYPE_NONE}
         * <li>{@link android.view.accessibility.CaptioningManager.CaptionStyle#EDGE_TYPE_OUTLINE}
         * <li>{@link android.view.accessibility.CaptioningManager.CaptionStyle#EDGE_TYPE_DROP_SHADOW}
         * </ul>
         *
         * @see #ACCESSIBILITY_CAPTIONING_EDGE_COLOR
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_EDGE_TYPE =
                "accessibility_captioning_edge_type";

        private static final Validator ACCESSIBILITY_CAPTIONING_EDGE_TYPE_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[]{"0", "1", "2"});

        /**
         * Integer property that specifes the edge color for captions as a
         * packed 32-bit color.
         *
         * @see #ACCESSIBILITY_CAPTIONING_EDGE_TYPE
         * @see android.graphics.Color#argb
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_EDGE_COLOR =
                "accessibility_captioning_edge_color";

        private static final Validator ACCESSIBILITY_CAPTIONING_EDGE_COLOR_VALIDATOR =
                ANY_INTEGER_VALIDATOR;

        /**
         * Integer property that specifes the window color for captions as a
         * packed 32-bit color.
         *
         * @see android.graphics.Color#argb
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_WINDOW_COLOR =
                "accessibility_captioning_window_color";

        private static final Validator ACCESSIBILITY_CAPTIONING_WINDOW_COLOR_VALIDATOR =
                ANY_INTEGER_VALIDATOR;

        /**
         * String property that specifies the typeface for captions, one of:
         * <ul>
         * <li>DEFAULT
         * <li>MONOSPACE
         * <li>SANS_SERIF
         * <li>SERIF
         * </ul>
         *
         * @see android.graphics.Typeface
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_TYPEFACE =
                "accessibility_captioning_typeface";

        private static final Validator ACCESSIBILITY_CAPTIONING_TYPEFACE_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[]{"DEFAULT",
                        "MONOSPACE", "SANS_SERIF", "SERIF"});

        /**
         * Floating point property that specifies font scaling for captions.
         *
         * @hide
         */
        public static final String ACCESSIBILITY_CAPTIONING_FONT_SCALE =
                "accessibility_captioning_font_scale";

        private static final Validator ACCESSIBILITY_CAPTIONING_FONT_SCALE_VALIDATOR =
                new SettingsValidators.InclusiveFloatRangeValidator(0.5f, 2.0f);

        /**
         * Setting that specifies whether display color inversion is enabled.
         */
        public static final String ACCESSIBILITY_DISPLAY_INVERSION_ENABLED =
                "accessibility_display_inversion_enabled";

        private static final Validator ACCESSIBILITY_DISPLAY_INVERSION_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Setting that specifies whether display color space adjustment is
         * enabled.
         *
         * @hide
         */
        public static final String ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED =
                "accessibility_display_daltonizer_enabled";

        private static final Validator ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Integer property that specifies the type of color space adjustment to
         * perform. Valid values are defined in AccessibilityManager and Settings arrays.xml:
         * - AccessibilityManager.DALTONIZER_DISABLED = -1
         * - AccessibilityManager.DALTONIZER_SIMULATE_MONOCHROMACY = 0
         * - <item>@string/daltonizer_mode_protanomaly</item> = 11
         * - AccessibilityManager.DALTONIZER_CORRECT_DEUTERANOMALY and
         *       <item>@string/daltonizer_mode_deuteranomaly</item> = 12
         * - <item>@string/daltonizer_mode_tritanomaly</item> = 13
         *
         * @hide
         */
        public static final String ACCESSIBILITY_DISPLAY_DALTONIZER =
                "accessibility_display_daltonizer";

        private static final Validator ACCESSIBILITY_DISPLAY_DALTONIZER_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(
                        new String[] {"-1", "0", "11", "12", "13"});

        /**
         * Setting that specifies whether automatic click when the mouse pointer stops moving is
         * enabled.
         *
         * @hide
         */
        public static final String ACCESSIBILITY_AUTOCLICK_ENABLED =
                "accessibility_autoclick_enabled";

        private static final Validator ACCESSIBILITY_AUTOCLICK_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Integer setting specifying amount of time in ms the mouse pointer has to stay still
         * before performing click when {@link #ACCESSIBILITY_AUTOCLICK_ENABLED} is set.
         *
         * @see #ACCESSIBILITY_AUTOCLICK_ENABLED
         * @hide
         */
        public static final String ACCESSIBILITY_AUTOCLICK_DELAY =
                "accessibility_autoclick_delay";

        private static final Validator ACCESSIBILITY_AUTOCLICK_DELAY_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * Whether or not larger size icons are used for the pointer of mouse/trackpad for
         * accessibility.
         * (0 = false, 1 = true)
         * @hide
         */
        public static final String ACCESSIBILITY_LARGE_POINTER_ICON =
                "accessibility_large_pointer_icon";

        private static final Validator ACCESSIBILITY_LARGE_POINTER_ICON_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * The timeout for considering a press to be a long press in milliseconds.
         * @hide
         */
        public static final String LONG_PRESS_TIMEOUT = "long_press_timeout";

        private static final Validator LONG_PRESS_TIMEOUT_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * The duration in milliseconds between the first tap's up event and the second tap's
         * down event for an interaction to be considered part of the same multi-press.
         * @hide
         */
        public static final String MULTI_PRESS_TIMEOUT = "multi_press_timeout";

        /**
         * List of the enabled print services.
         *
         * N and beyond uses {@link #DISABLED_PRINT_SERVICES}. But this might be used in an upgrade
         * from pre-N.
         *
         * @hide
         */
        public static final String ENABLED_PRINT_SERVICES =
            "enabled_print_services";

        /**
         * List of the disabled print services.
         *
         * @hide
         */
        @TestApi
        public static final String DISABLED_PRINT_SERVICES =
            "disabled_print_services";

        /**
         * The saved value for WindowManagerService.setForcedDisplayDensity()
         * formatted as a single integer representing DPI. If unset, then use
         * the real display density.
         *
         * @hide
         */
        public static final String DISPLAY_DENSITY_FORCED = "display_density_forced";

        /**
         * Setting to always use the default text-to-speech settings regardless
         * of the application settings.
         * 1 = override application settings,
         * 0 = use application settings (if specified).
         *
         * @deprecated  The value of this setting is no longer respected by
         * the framework text to speech APIs as of the Ice Cream Sandwich release.
         */
        @Deprecated
        public static final String TTS_USE_DEFAULTS = "tts_use_defaults";

        /**
         * Default text-to-speech engine speech rate. 100 = 1x
         */
        public static final String TTS_DEFAULT_RATE = "tts_default_rate";

        private static final Validator TTS_DEFAULT_RATE_VALIDATOR = NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * Default text-to-speech engine pitch. 100 = 1x
         */
        public static final String TTS_DEFAULT_PITCH = "tts_default_pitch";

        private static final Validator TTS_DEFAULT_PITCH_VALIDATOR = NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * Default text-to-speech engine.
         */
        public static final String TTS_DEFAULT_SYNTH = "tts_default_synth";

        private static final Validator TTS_DEFAULT_SYNTH_VALIDATOR = PACKAGE_NAME_VALIDATOR;

        /**
         * Default text-to-speech language.
         *
         * @deprecated this setting is no longer in use, as of the Ice Cream
         * Sandwich release. Apps should never need to read this setting directly,
         * instead can query the TextToSpeech framework classes for the default
         * locale. {@link TextToSpeech#getLanguage()}.
         */
        @Deprecated
        public static final String TTS_DEFAULT_LANG = "tts_default_lang";

        /**
         * Default text-to-speech country.
         *
         * @deprecated this setting is no longer in use, as of the Ice Cream
         * Sandwich release. Apps should never need to read this setting directly,
         * instead can query the TextToSpeech framework classes for the default
         * locale. {@link TextToSpeech#getLanguage()}.
         */
        @Deprecated
        public static final String TTS_DEFAULT_COUNTRY = "tts_default_country";

        /**
         * Default text-to-speech locale variant.
         *
         * @deprecated this setting is no longer in use, as of the Ice Cream
         * Sandwich release. Apps should never need to read this setting directly,
         * instead can query the TextToSpeech framework classes for the
         * locale that is in use {@link TextToSpeech#getLanguage()}.
         */
        @Deprecated
        public static final String TTS_DEFAULT_VARIANT = "tts_default_variant";

        /**
         * Stores the default tts locales on a per engine basis. Stored as
         * a comma seperated list of values, each value being of the form
         * {@code engine_name:locale} for example,
         * {@code com.foo.ttsengine:eng-USA,com.bar.ttsengine:esp-ESP}. This
         * supersedes {@link #TTS_DEFAULT_LANG}, {@link #TTS_DEFAULT_COUNTRY} and
         * {@link #TTS_DEFAULT_VARIANT}. Apps should never need to read this
         * setting directly, and can query the TextToSpeech framework classes
         * for the locale that is in use.
         *
         * @hide
         */
        public static final String TTS_DEFAULT_LOCALE = "tts_default_locale";

        private static final Validator TTS_DEFAULT_LOCALE_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                if (value == null || value.length() == 0) {
                    return false;
                }
                String[] ttsLocales = value.split(",");
                boolean valid = true;
                for (String ttsLocale : ttsLocales) {
                    String[] parts = ttsLocale.split(":");
                    valid |= ((parts.length == 2)
                            && (parts[0].length() > 0)
                            && ANY_STRING_VALIDATOR.validate(parts[0])
                            && LOCALE_VALIDATOR.validate(parts[1]));
                }
                return valid;
            }
        };

        /**
         * Space delimited list of plugin packages that are enabled.
         */
        public static final String TTS_ENABLED_PLUGINS = "tts_enabled_plugins";

        private static final Validator TTS_ENABLED_PLUGINS_VALIDATOR =
                new SettingsValidators.PackageNameListValidator(" ");

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON}
         * instead.
         */
        @Deprecated
        public static final String WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON =
                Global.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON;

        private static final Validator WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY}
         * instead.
         */
        @Deprecated
        public static final String WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY =
                Global.WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY;

        private static final Validator WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_NUM_OPEN_NETWORKS_KEPT}
         * instead.
         */
        @Deprecated
        public static final String WIFI_NUM_OPEN_NETWORKS_KEPT =
                Global.WIFI_NUM_OPEN_NETWORKS_KEPT;

        private static final Validator WIFI_NUM_OPEN_NETWORKS_KEPT_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_ON}
         * instead.
         */
        @Deprecated
        public static final String WIFI_ON = Global.WIFI_ON;

        /**
         * The acceptable packet loss percentage (range 0 - 100) before trying
         * another AP on the same network.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_ACCEPTABLE_PACKET_LOSS_PERCENTAGE =
                "wifi_watchdog_acceptable_packet_loss_percentage";

        /**
         * The number of access points required for a network in order for the
         * watchdog to monitor it.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_AP_COUNT = "wifi_watchdog_ap_count";

        /**
         * The delay between background checks.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_BACKGROUND_CHECK_DELAY_MS =
                "wifi_watchdog_background_check_delay_ms";

        /**
         * Whether the Wi-Fi watchdog is enabled for background checking even
         * after it thinks the user has connected to a good access point.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED =
                "wifi_watchdog_background_check_enabled";

        /**
         * The timeout for a background ping
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_BACKGROUND_CHECK_TIMEOUT_MS =
                "wifi_watchdog_background_check_timeout_ms";

        /**
         * The number of initial pings to perform that *may* be ignored if they
         * fail. Again, if these fail, they will *not* be used in packet loss
         * calculation. For example, one network always seemed to time out for
         * the first couple pings, so this is set to 3 by default.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_INITIAL_IGNORED_PING_COUNT =
            "wifi_watchdog_initial_ignored_ping_count";

        /**
         * The maximum number of access points (per network) to attempt to test.
         * If this number is reached, the watchdog will no longer monitor the
         * initial connection state for the network. This is a safeguard for
         * networks containing multiple APs whose DNS does not respond to pings.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_MAX_AP_CHECKS = "wifi_watchdog_max_ap_checks";

        /**
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_WATCHDOG_ON} instead
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_ON = "wifi_watchdog_on";

        /**
         * A comma-separated list of SSIDs for which the Wi-Fi watchdog should be enabled.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_WATCH_LIST = "wifi_watchdog_watch_list";

        /**
         * The number of pings to test if an access point is a good connection.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_PING_COUNT = "wifi_watchdog_ping_count";

        /**
         * The delay between pings.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_PING_DELAY_MS = "wifi_watchdog_ping_delay_ms";

        /**
         * The timeout per ping.
         * @deprecated This setting is not used.
         */
        @Deprecated
        public static final String WIFI_WATCHDOG_PING_TIMEOUT_MS = "wifi_watchdog_ping_timeout_ms";

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Global#WIFI_MAX_DHCP_RETRY_COUNT} instead
         */
        @Deprecated
        public static final String WIFI_MAX_DHCP_RETRY_COUNT = Global.WIFI_MAX_DHCP_RETRY_COUNT;

        /**
         * @deprecated Use
         * {@link android.provider.Settings.Global#WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS} instead
         */
        @Deprecated
        public static final String WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS =
                Global.WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS;

        /**
         * The number of milliseconds to hold on to a PendingIntent based request. This delay gives
         * the receivers of the PendingIntent an opportunity to make a new network request before
         * the Network satisfying the request is potentially removed.
         *
         * @hide
         */
        public static final String CONNECTIVITY_RELEASE_PENDING_INTENT_DELAY_MS =
                "connectivity_release_pending_intent_delay_ms";

        /**
         * Whether background data usage is allowed.
         *
         * @deprecated As of {@link VERSION_CODES#ICE_CREAM_SANDWICH},
         *             availability of background data depends on several
         *             combined factors. When background data is unavailable,
         *             {@link ConnectivityManager#getActiveNetworkInfo()} will
         *             now appear disconnected.
         */
        @Deprecated
        public static final String BACKGROUND_DATA = "background_data";

        /**
         * Origins for which browsers should allow geolocation by default.
         * The value is a space-separated list of origins.
         */
        public static final String ALLOWED_GEOLOCATION_ORIGINS
                = "allowed_geolocation_origins";

        /**
         * The preferred TTY mode     0 = TTy Off, CDMA default
         *                            1 = TTY Full
         *                            2 = TTY HCO
         *                            3 = TTY VCO
         * @hide
         */
        public static final String PREFERRED_TTY_MODE =
                "preferred_tty_mode";

        private static final Validator PREFERRED_TTY_MODE_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[]{"0", "1", "2", "3"});

        /**
         * Whether the enhanced voice privacy mode is enabled.
         * 0 = normal voice privacy
         * 1 = enhanced voice privacy
         * @hide
         */
        public static final String ENHANCED_VOICE_PRIVACY_ENABLED = "enhanced_voice_privacy_enabled";

        private static final Validator ENHANCED_VOICE_PRIVACY_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the TTY mode mode is enabled.
         * 0 = disabled
         * 1 = enabled
         * @hide
         */
        public static final String TTY_MODE_ENABLED = "tty_mode_enabled";

        private static final Validator TTY_MODE_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Controls whether settings backup is enabled.
         * Type: int ( 0 = disabled, 1 = enabled )
         * @hide
         */
        public static final String BACKUP_ENABLED = "backup_enabled";

        /**
         * Controls whether application data is automatically restored from backup
         * at install time.
         * Type: int ( 0 = disabled, 1 = enabled )
         * @hide
         */
        public static final String BACKUP_AUTO_RESTORE = "backup_auto_restore";

        /**
         * Indicates whether settings backup has been fully provisioned.
         * Type: int ( 0 = unprovisioned, 1 = fully provisioned )
         * @hide
         */
        public static final String BACKUP_PROVISIONED = "backup_provisioned";

        /**
         * Component of the transport to use for backup/restore.
         * @hide
         */
        public static final String BACKUP_TRANSPORT = "backup_transport";

        /**
         * Version for which the setup wizard was last shown.  Bumped for
         * each release when there is new setup information to show.
         * @hide
         */
        public static final String LAST_SETUP_SHOWN = "last_setup_shown";

        /**
         * The interval in milliseconds after which Wi-Fi is considered idle.
         * When idle, it is possible for the device to be switched from Wi-Fi to
         * the mobile data network.
         * @hide
         * @deprecated Use {@link android.provider.Settings.Global#WIFI_IDLE_MS}
         * instead.
         */
        @Deprecated
        public static final String WIFI_IDLE_MS = Global.WIFI_IDLE_MS;

        /**
         * The global search provider chosen by the user (if multiple global
         * search providers are installed). This will be the provider returned
         * by {@link SearchManager#getGlobalSearchActivity()} if it's still
         * installed. This setting is stored as a flattened component name as
         * per {@link ComponentName#flattenToString()}.
         *
         * @hide
         */
        public static final String SEARCH_GLOBAL_SEARCH_ACTIVITY =
                "search_global_search_activity";

        /**
         * The number of promoted sources in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_NUM_PROMOTED_SOURCES = "search_num_promoted_sources";
        /**
         * The maximum number of suggestions returned by GlobalSearch.
         * @hide
         */
        public static final String SEARCH_MAX_RESULTS_TO_DISPLAY = "search_max_results_to_display";
        /**
         * The number of suggestions GlobalSearch will ask each non-web search source for.
         * @hide
         */
        public static final String SEARCH_MAX_RESULTS_PER_SOURCE = "search_max_results_per_source";
        /**
         * The number of suggestions the GlobalSearch will ask the web search source for.
         * @hide
         */
        public static final String SEARCH_WEB_RESULTS_OVERRIDE_LIMIT =
                "search_web_results_override_limit";
        /**
         * The number of milliseconds that GlobalSearch will wait for suggestions from
         * promoted sources before continuing with all other sources.
         * @hide
         */
        public static final String SEARCH_PROMOTED_SOURCE_DEADLINE_MILLIS =
                "search_promoted_source_deadline_millis";
        /**
         * The number of milliseconds before GlobalSearch aborts search suggesiton queries.
         * @hide
         */
        public static final String SEARCH_SOURCE_TIMEOUT_MILLIS = "search_source_timeout_millis";
        /**
         * The maximum number of milliseconds that GlobalSearch shows the previous results
         * after receiving a new query.
         * @hide
         */
        public static final String SEARCH_PREFILL_MILLIS = "search_prefill_millis";
        /**
         * The maximum age of log data used for shortcuts in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_MAX_STAT_AGE_MILLIS = "search_max_stat_age_millis";
        /**
         * The maximum age of log data used for source ranking in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_MAX_SOURCE_EVENT_AGE_MILLIS =
                "search_max_source_event_age_millis";
        /**
         * The minimum number of impressions needed to rank a source in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_MIN_IMPRESSIONS_FOR_SOURCE_RANKING =
                "search_min_impressions_for_source_ranking";
        /**
         * The minimum number of clicks needed to rank a source in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_MIN_CLICKS_FOR_SOURCE_RANKING =
                "search_min_clicks_for_source_ranking";
        /**
         * The maximum number of shortcuts shown by GlobalSearch.
         * @hide
         */
        public static final String SEARCH_MAX_SHORTCUTS_RETURNED = "search_max_shortcuts_returned";
        /**
         * The size of the core thread pool for suggestion queries in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_QUERY_THREAD_CORE_POOL_SIZE =
                "search_query_thread_core_pool_size";
        /**
         * The maximum size of the thread pool for suggestion queries in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_QUERY_THREAD_MAX_POOL_SIZE =
                "search_query_thread_max_pool_size";
        /**
         * The size of the core thread pool for shortcut refreshing in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_SHORTCUT_REFRESH_CORE_POOL_SIZE =
                "search_shortcut_refresh_core_pool_size";
        /**
         * The maximum size of the thread pool for shortcut refreshing in GlobalSearch.
         * @hide
         */
        public static final String SEARCH_SHORTCUT_REFRESH_MAX_POOL_SIZE =
                "search_shortcut_refresh_max_pool_size";
        /**
         * The maximun time that excess threads in the GlobalSeach thread pools will
         * wait before terminating.
         * @hide
         */
        public static final String SEARCH_THREAD_KEEPALIVE_SECONDS =
                "search_thread_keepalive_seconds";
        /**
         * The maximum number of concurrent suggestion queries to each source.
         * @hide
         */
        public static final String SEARCH_PER_SOURCE_CONCURRENT_QUERY_LIMIT =
                "search_per_source_concurrent_query_limit";

        /**
         * Whether or not alert sounds are played on StorageManagerService events.
         * (0 = false, 1 = true)
         * @hide
         */
        public static final String MOUNT_PLAY_NOTIFICATION_SND = "mount_play_not_snd";

        private static final Validator MOUNT_PLAY_NOTIFICATION_SND_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether or not UMS auto-starts on UMS host detection. (0 = false, 1 = true)
         * @hide
         */
        public static final String MOUNT_UMS_AUTOSTART = "mount_ums_autostart";

        private static final Validator MOUNT_UMS_AUTOSTART_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether or not a notification is displayed on UMS host detection. (0 = false, 1 = true)
         * @hide
         */
        public static final String MOUNT_UMS_PROMPT = "mount_ums_prompt";

        private static final Validator MOUNT_UMS_PROMPT_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether or not a notification is displayed while UMS is enabled. (0 = false, 1 = true)
         * @hide
         */
        public static final String MOUNT_UMS_NOTIFY_ENABLED = "mount_ums_notify_enabled";

        private static final Validator MOUNT_UMS_NOTIFY_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * If nonzero, ANRs in invisible background processes bring up a dialog.
         * Otherwise, the process will be silently killed.
         *
         * Also prevents ANRs and crash dialogs from being suppressed.
         * @hide
         */
        public static final String ANR_SHOW_BACKGROUND = "anr_show_background";

        /**
         * If nonzero, crashes in foreground processes will bring up a dialog.
         * Otherwise, the process will be silently killed.
         * @hide
         */
        public static final String SHOW_FIRST_CRASH_DIALOG_DEV_OPTION =
                "show_first_crash_dialog_dev_option";

        private static final Validator SHOW_FIRST_CRASH_DIALOG_DEV_OPTION_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * The {@link ComponentName} string of the service to be used as the voice recognition
         * service.
         *
         * @hide
         */
        public static final String VOICE_RECOGNITION_SERVICE = "voice_recognition_service";

        /**
         * Stores whether an user has consented to have apps verified through PAM.
         * The value is boolean (1 or 0).
         *
         * @hide
         */
        public static final String PACKAGE_VERIFIER_USER_CONSENT =
            "package_verifier_user_consent";

        /**
         * The {@link ComponentName} string of the selected spell checker service which is
         * one of the services managed by the text service manager.
         *
         * @hide
         */
        public static final String SELECTED_SPELL_CHECKER = "selected_spell_checker";

        private static final Validator SELECTED_SPELL_CHECKER_VALIDATOR = COMPONENT_NAME_VALIDATOR;

        /**
         * The {@link ComponentName} string of the selected subtype of the selected spell checker
         * service which is one of the services managed by the text service manager.
         *
         * @hide
         */
        public static final String SELECTED_SPELL_CHECKER_SUBTYPE =
                "selected_spell_checker_subtype";

        private static final Validator SELECTED_SPELL_CHECKER_SUBTYPE_VALIDATOR =
                COMPONENT_NAME_VALIDATOR;

        /**
         * Whether spell checker is enabled or not.
         *
         * @hide
         */
        public static final String SPELL_CHECKER_ENABLED = "spell_checker_enabled";

        private static final Validator SPELL_CHECKER_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * What happens when the user presses the Power button while in-call
         * and the screen is on.<br/>
         * <b>Values:</b><br/>
         * 1 - The Power button turns off the screen and locks the device. (Default behavior)<br/>
         * 2 - The Power button hangs up the current call.<br/>
         *
         * @hide
         */
        public static final String INCALL_POWER_BUTTON_BEHAVIOR = "incall_power_button_behavior";

        private static final Validator INCALL_POWER_BUTTON_BEHAVIOR_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[]{"1", "2"});

        /**
         * INCALL_POWER_BUTTON_BEHAVIOR value for "turn off screen".
         * @hide
         */
        public static final int INCALL_POWER_BUTTON_BEHAVIOR_SCREEN_OFF = 0x1;

        /**
         * INCALL_POWER_BUTTON_BEHAVIOR value for "hang up".
         * @hide
         */
        public static final int INCALL_POWER_BUTTON_BEHAVIOR_HANGUP = 0x2;

        /**
         * INCALL_POWER_BUTTON_BEHAVIOR default value.
         * @hide
         */
        public static final int INCALL_POWER_BUTTON_BEHAVIOR_DEFAULT =
                INCALL_POWER_BUTTON_BEHAVIOR_SCREEN_OFF;

        /**
         * What happens when the user presses the Back button while in-call
         * and the screen is on.<br/>
         * <b>Values:</b><br/>
         * 0 - The Back buttons does nothing different.<br/>
         * 1 - The Back button hangs up the current call.<br/>
         *
         * @hide
         */
        public static final String INCALL_BACK_BUTTON_BEHAVIOR = "incall_back_button_behavior";

        /**
         * INCALL_BACK_BUTTON_BEHAVIOR value for no action.
         * @hide
         */
        public static final int INCALL_BACK_BUTTON_BEHAVIOR_NONE = 0x0;

        /**
         * INCALL_BACK_BUTTON_BEHAVIOR value for "hang up".
         * @hide
         */
        public static final int INCALL_BACK_BUTTON_BEHAVIOR_HANGUP = 0x1;

        /**
         * INCALL_POWER_BUTTON_BEHAVIOR default value.
         * @hide
         */
        public static final int INCALL_BACK_BUTTON_BEHAVIOR_DEFAULT =
                INCALL_BACK_BUTTON_BEHAVIOR_NONE;

        /**
         * Whether the device should wake when the wake gesture sensor detects motion.
         * @hide
         */
        public static final String WAKE_GESTURE_ENABLED = "wake_gesture_enabled";

        private static final Validator WAKE_GESTURE_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the device should doze if configured.
         * @hide
         */
        public static final String DOZE_ENABLED = "doze_enabled";

        private static final Validator DOZE_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether doze should be always on.
         * @hide
         */
        public static final String DOZE_ALWAYS_ON = "doze_always_on";

        /**
         * Whether the device should pulse on pick up gesture.
         * @hide
         */
        public static final String DOZE_PULSE_ON_PICK_UP = "doze_pulse_on_pick_up";

        private static final Validator DOZE_PULSE_ON_PICK_UP_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the device should pulse on long press gesture.
         * @hide
         */
        public static final String DOZE_PULSE_ON_LONG_PRESS = "doze_pulse_on_long_press";

        /**
         * Whether the device should pulse on double tap gesture.
         * @hide
         */
        public static final String DOZE_PULSE_ON_DOUBLE_TAP = "doze_pulse_on_double_tap";

        private static final Validator DOZE_PULSE_ON_DOUBLE_TAP_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The current night mode that has been selected by the user.  Owned
         * and controlled by UiModeManagerService.  Constants are as per
         * UiModeManager.
         * @hide
         */
        public static final String UI_NIGHT_MODE = "ui_night_mode";

        /**
         * Whether screensavers are enabled.
         * @hide
         */
        public static final String SCREENSAVER_ENABLED = "screensaver_enabled";

        private static final Validator SCREENSAVER_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The user's chosen screensaver components.
         *
         * These will be launched by the PhoneWindowManager after a timeout when not on
         * battery, or upon dock insertion (if SCREENSAVER_ACTIVATE_ON_DOCK is set to 1).
         * @hide
         */
        public static final String SCREENSAVER_COMPONENTS = "screensaver_components";

        private static final Validator SCREENSAVER_COMPONENTS_VALIDATOR =
                new SettingsValidators.ComponentNameListValidator(",");

        /**
         * If screensavers are enabled, whether the screensaver should be automatically launched
         * when the device is inserted into a (desk) dock.
         * @hide
         */
        public static final String SCREENSAVER_ACTIVATE_ON_DOCK = "screensaver_activate_on_dock";

        private static final Validator SCREENSAVER_ACTIVATE_ON_DOCK_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * If screensavers are enabled, whether the screensaver should be automatically launched
         * when the screen times out when not on battery.
         * @hide
         */
        public static final String SCREENSAVER_ACTIVATE_ON_SLEEP = "screensaver_activate_on_sleep";

        private static final Validator SCREENSAVER_ACTIVATE_ON_SLEEP_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * If screensavers are enabled, the default screensaver component.
         * @hide
         */
        public static final String SCREENSAVER_DEFAULT_COMPONENT = "screensaver_default_component";

        /**
         * The default NFC payment component
         * @hide
         */
        public static final String NFC_PAYMENT_DEFAULT_COMPONENT = "nfc_payment_default_component";

        private static final Validator NFC_PAYMENT_DEFAULT_COMPONENT_VALIDATOR =
                COMPONENT_NAME_VALIDATOR;

        /**
         * Whether NFC payment is handled by the foreground application or a default.
         * @hide
         */
        public static final String NFC_PAYMENT_FOREGROUND = "nfc_payment_foreground";

        /**
         * Specifies the package name currently configured to be the primary sms application
         * @hide
         */
        public static final String SMS_DEFAULT_APPLICATION = "sms_default_application";

        /**
         * Specifies the package name currently configured to be the default dialer application
         * @hide
         */
        public static final String DIALER_DEFAULT_APPLICATION = "dialer_default_application";

        /**
         * Specifies the package name currently configured to be the emergency assistance application
         *
         * @see android.telephony.TelephonyManager#ACTION_EMERGENCY_ASSISTANCE
         *
         * @hide
         */
        public static final String EMERGENCY_ASSISTANCE_APPLICATION = "emergency_assistance_application";

        /**
         * Specifies whether the current app context on scren (assist data) will be sent to the
         * assist application (active voice interaction service).
         *
         * @hide
         */
        public static final String ASSIST_STRUCTURE_ENABLED = "assist_structure_enabled";

        /**
         * Specifies whether a screenshot of the screen contents will be sent to the assist
         * application (active voice interaction service).
         *
         * @hide
         */
        public static final String ASSIST_SCREENSHOT_ENABLED = "assist_screenshot_enabled";

        /**
         * Specifies whether the screen will show an animation if screen contents are sent to the
         * assist application (active voice interaction service).
         *
         * Note that the disclosure will be forced for third-party assistants or if the device
         * does not support disabling it.
         *
         * @hide
         */
        public static final String ASSIST_DISCLOSURE_ENABLED = "assist_disclosure_enabled";

        /**
         * Control if rotation suggestions are sent to System UI when in rotation locked mode.
         * Done to enable screen rotation while the the screen rotation is locked. Enabling will
         * poll the accelerometer in rotation locked mode.
         *
         * If 0, then rotation suggestions are not sent to System UI. If 1, suggestions are sent.
         *
         * @hide
         */

        public static final String SHOW_ROTATION_SUGGESTIONS = "show_rotation_suggestions";

        /**
         * The disabled state of SHOW_ROTATION_SUGGESTIONS.
         * @hide
         */
        public static final int SHOW_ROTATION_SUGGESTIONS_DISABLED = 0x0;

        /**
         * The enabled state of SHOW_ROTATION_SUGGESTIONS.
         * @hide
         */
        public static final int SHOW_ROTATION_SUGGESTIONS_ENABLED = 0x1;

        /**
         * The default state of SHOW_ROTATION_SUGGESTIONS.
         * @hide
         */
        public static final int SHOW_ROTATION_SUGGESTIONS_DEFAULT =
                SHOW_ROTATION_SUGGESTIONS_ENABLED;

        /**
         * The number of accepted rotation suggestions. Used to determine if the user has been
         * introduced to rotation suggestions.
         * @hide
         */
        public static final String NUM_ROTATION_SUGGESTIONS_ACCEPTED =
                "num_rotation_suggestions_accepted";

        /**
         * Read only list of the service components that the current user has explicitly allowed to
         * see and assist with all of the user's notifications.
         *
         * @deprecated Use
         * {@link NotificationManager#isNotificationListenerAccessGranted(ComponentName)}.
         * @hide
         */
        @Deprecated
        public static final String ENABLED_NOTIFICATION_ASSISTANT =
                "enabled_notification_assistant";

        private static final Validator ENABLED_NOTIFICATION_ASSISTANT_VALIDATOR =
                new SettingsValidators.ComponentNameListValidator(":");

        /**
         * Read only list of the service components that the current user has explicitly allowed to
         * see all of the user's notifications, separated by ':'.
         *
         * @hide
         * @deprecated Use
         * {@link NotificationManager#isNotificationAssistantAccessGranted(ComponentName)}.
         */
        @Deprecated
        public static final String ENABLED_NOTIFICATION_LISTENERS = "enabled_notification_listeners";

        private static final Validator ENABLED_NOTIFICATION_LISTENERS_VALIDATOR =
                new SettingsValidators.ComponentNameListValidator(":");

        /**
         * Read only list of the packages that the current user has explicitly allowed to
         * manage do not disturb, separated by ':'.
         *
         * @deprecated Use {@link NotificationManager#isNotificationPolicyAccessGranted()}.
         * @hide
         */
        @Deprecated
        @TestApi
        public static final String ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES =
                "enabled_notification_policy_access_packages";

        private static final Validator ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES_VALIDATOR =
                new SettingsValidators.PackageNameListValidator(":");

        /**
         * Defines whether managed profile ringtones should be synced from it's parent profile
         * <p>
         * 0 = ringtones are not synced
         * 1 = ringtones are synced from the profile's parent (default)
         * <p>
         * This value is only used for managed profiles.
         * @hide
         */
        @TestApi
        @RequiresPermission(Manifest.permission.WRITE_SECURE_SETTINGS)
        public static final String SYNC_PARENT_SOUNDS = "sync_parent_sounds";

        private static final Validator SYNC_PARENT_SOUNDS_VALIDATOR = BOOLEAN_VALIDATOR;

        /** @hide */
        public static final String IMMERSIVE_MODE_CONFIRMATIONS = "immersive_mode_confirmations";

        /**
         * This is the query URI for finding a print service to install.
         *
         * @hide
         */
        public static final String PRINT_SERVICE_SEARCH_URI = "print_service_search_uri";

        /**
         * This is the query URI for finding a NFC payment service to install.
         *
         * @hide
         */
        public static final String PAYMENT_SERVICE_SEARCH_URI = "payment_service_search_uri";

        /**
         * This is the query URI for finding a auto fill service to install.
         *
         * @hide
         */
        public static final String AUTOFILL_SERVICE_SEARCH_URI = "autofill_service_search_uri";

        /**
         * If enabled, apps should try to skip any introductory hints on first launch. This might
         * apply to users that are already familiar with the environment or temporary users.
         * <p>
         * Type : int (0 to show hints, 1 to skip showing hints)
         */
        public static final String SKIP_FIRST_USE_HINTS = "skip_first_use_hints";

        /**
         * Persisted playback time after a user confirmation of an unsafe volume level.
         *
         * @hide
         */
        public static final String UNSAFE_VOLUME_MUSIC_ACTIVE_MS = "unsafe_volume_music_active_ms";

        /**
         * This preference enables notification display on the lockscreen.
         * @hide
         */
        public static final String LOCK_SCREEN_SHOW_NOTIFICATIONS =
                "lock_screen_show_notifications";

        /**
         * List of TV inputs that are currently hidden. This is a string
         * containing the IDs of all hidden TV inputs. Each ID is encoded by
         * {@link android.net.Uri#encode(String)} and separated by ':'.
         * @hide
         */
        public static final String TV_INPUT_HIDDEN_INPUTS = "tv_input_hidden_inputs";

        /**
         * List of custom TV input labels. This is a string containing <TV input id, custom name>
         * pairs. TV input id and custom name are encoded by {@link android.net.Uri#encode(String)}
         * and separated by ','. Each pair is separated by ':'.
         * @hide
         */
        public static final String TV_INPUT_CUSTOM_LABELS = "tv_input_custom_labels";

        /**
         * Whether automatic routing of system audio to USB audio peripheral is disabled.
         * The value is boolean (1 or 0), where 1 means automatic routing is disabled,
         * and 0 means automatic routing is enabled.
         *
         * @hide
         */
        public static final String USB_AUDIO_AUTOMATIC_ROUTING_DISABLED =
                "usb_audio_automatic_routing_disabled";

        /**
         * The timeout in milliseconds before the device fully goes to sleep after
         * a period of inactivity.  This value sets an upper bound on how long the device
         * will stay awake or dreaming without user activity.  It should generally
         * be longer than {@link Settings.System#SCREEN_OFF_TIMEOUT} as otherwise the device
         * will sleep before it ever has a chance to dream.
         * <p>
         * Use -1 to disable this timeout.
         * </p>
         *
         * @hide
         */
        public static final String SLEEP_TIMEOUT = "sleep_timeout";

        private static final Validator SLEEP_TIMEOUT_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(-1, Integer.MAX_VALUE);

        /**
         * Controls whether double tap to wake is enabled.
         * @hide
         */
        public static final String DOUBLE_TAP_TO_WAKE = "double_tap_to_wake";

        private static final Validator DOUBLE_TAP_TO_WAKE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The current assistant component. It could be a voice interaction service,
         * or an activity that handles ACTION_ASSIST, or empty which means using the default
         * handling.
         *
         * @hide
         */
        public static final String ASSISTANT = "assistant";

        /**
         * Whether the camera launch gesture should be disabled.
         *
         * @hide
         */
        public static final String CAMERA_GESTURE_DISABLED = "camera_gesture_disabled";

        private static final Validator CAMERA_GESTURE_DISABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether the camera launch gesture to double tap the power button when the screen is off
         * should be disabled.
         *
         * @hide
         */
        public static final String CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED =
                "camera_double_tap_power_gesture_disabled";

        private static final Validator CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Whether the camera double twist gesture to flip between front and back mode should be
         * enabled.
         *
         * @hide
         */
        public static final String CAMERA_DOUBLE_TWIST_TO_FLIP_ENABLED =
                "camera_double_twist_to_flip_enabled";

        private static final Validator CAMERA_DOUBLE_TWIST_TO_FLIP_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Whether or not the smart camera lift trigger that launches the camera when the user moves
         * the phone into a position for taking photos should be enabled.
         *
         * @hide
         */
        public static final String CAMERA_LIFT_TRIGGER_ENABLED = "camera_lift_trigger_enabled";

        /**
         * The default enable state of the camera lift trigger.
         *
         * @hide
         */
        public static final int CAMERA_LIFT_TRIGGER_ENABLED_DEFAULT = 1;

        /**
         * Whether the assist gesture should be enabled.
         *
         * @hide
         */
        public static final String ASSIST_GESTURE_ENABLED = "assist_gesture_enabled";

        private static final Validator ASSIST_GESTURE_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Sensitivity control for the assist gesture.
         *
         * @hide
         */
        public static final String ASSIST_GESTURE_SENSITIVITY = "assist_gesture_sensitivity";

        private static final Validator ASSIST_GESTURE_SENSITIVITY_VALIDATOR =
                new SettingsValidators.InclusiveFloatRangeValidator(0.0f, 1.0f);

        /**
         * Whether the assist gesture should silence alerts.
         *
         * @hide
         */
        public static final String ASSIST_GESTURE_SILENCE_ALERTS_ENABLED =
                "assist_gesture_silence_alerts_enabled";

        private static final Validator ASSIST_GESTURE_SILENCE_ALERTS_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Whether the assist gesture should wake the phone.
         *
         * @hide
         */
        public static final String ASSIST_GESTURE_WAKE_ENABLED =
                "assist_gesture_wake_enabled";

        private static final Validator ASSIST_GESTURE_WAKE_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Whether Assist Gesture Deferred Setup has been completed
         *
         * @hide
         */
        public static final String ASSIST_GESTURE_SETUP_COMPLETE = "assist_gesture_setup_complete";

        private static final Validator ASSIST_GESTURE_SETUP_COMPLETE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Control whether Night display is currently activated.
         * @hide
         */
        public static final String NIGHT_DISPLAY_ACTIVATED = "night_display_activated";

        /**
         * Control whether Night display will automatically activate/deactivate.
         * @hide
         */
        public static final String NIGHT_DISPLAY_AUTO_MODE = "night_display_auto_mode";

        private static final Validator NIGHT_DISPLAY_AUTO_MODE_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 2);

        /**
         * Control the color temperature of Night Display, represented in Kelvin.
         * @hide
         */
        public static final String NIGHT_DISPLAY_COLOR_TEMPERATURE =
                "night_display_color_temperature";

        private static final Validator NIGHT_DISPLAY_COLOR_TEMPERATURE_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * Custom time when Night display is scheduled to activate.
         * Represented as milliseconds from midnight (e.g. 79200000 == 10pm).
         * @hide
         */
        public static final String NIGHT_DISPLAY_CUSTOM_START_TIME =
                "night_display_custom_start_time";

        private static final Validator NIGHT_DISPLAY_CUSTOM_START_TIME_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * Custom time when Night display is scheduled to deactivate.
         * Represented as milliseconds from midnight (e.g. 21600000 == 6am).
         * @hide
         */
        public static final String NIGHT_DISPLAY_CUSTOM_END_TIME = "night_display_custom_end_time";

        private static final Validator NIGHT_DISPLAY_CUSTOM_END_TIME_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * A String representing the LocalDateTime when Night display was last activated. Use to
         * decide whether to apply the current activated state after a reboot or user change. In
         * legacy cases, this is represented by the time in milliseconds (since epoch).
         * @hide
         */
        public static final String NIGHT_DISPLAY_LAST_ACTIVATED_TIME =
                "night_display_last_activated_time";

        /**
         * Names of the service components that the current user has explicitly allowed to
         * be a VR mode listener, separated by ':'.
         *
         * @hide
         */
        public static final String ENABLED_VR_LISTENERS = "enabled_vr_listeners";

        private static final Validator ENABLED_VR_LISTENERS_VALIDATOR =
                new SettingsValidators.ComponentNameListValidator(":");

        /**
         * Behavior of the display while in VR mode.
         *
         * One of {@link #VR_DISPLAY_MODE_LOW_PERSISTENCE} or {@link #VR_DISPLAY_MODE_OFF}.
         *
         * @hide
         */
        public static final String VR_DISPLAY_MODE = "vr_display_mode";

        private static final Validator VR_DISPLAY_MODE_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[]{"0", "1"});

        /**
         * Lower the display persistence while the system is in VR mode.
         *
         * @see PackageManager#FEATURE_VR_MODE_HIGH_PERFORMANCE
         *
         * @hide.
         */
        public static final int VR_DISPLAY_MODE_LOW_PERSISTENCE = 0;

        /**
         * Do not alter the display persistence while the system is in VR mode.
         *
         * @see PackageManager#FEATURE_VR_MODE_HIGH_PERFORMANCE
         *
         * @hide.
         */
        public static final int VR_DISPLAY_MODE_OFF = 1;

        /**
         * Whether CarrierAppUtils#disableCarrierAppsUntilPrivileged has been executed at least
         * once.
         *
         * <p>This is used to ensure that we only take one pass which will disable apps that are not
         * privileged (if any). From then on, we only want to enable apps (when a matching SIM is
         * inserted), to avoid disabling an app that the user might actively be using.
         *
         * <p>Will be set to 1 once executed.
         *
         * @hide
         */
        public static final String CARRIER_APPS_HANDLED = "carrier_apps_handled";

        /**
         * Whether parent user can access remote contact in managed profile.
         *
         * @hide
         */
        public static final String MANAGED_PROFILE_CONTACT_REMOTE_SEARCH =
                "managed_profile_contact_remote_search";

        /**
         * Whether or not the automatic storage manager is enabled and should run on the device.
         *
         * @hide
         */
        public static final String AUTOMATIC_STORAGE_MANAGER_ENABLED =
                "automatic_storage_manager_enabled";

        /**
         * How many days of information for the automatic storage manager to retain on the device.
         *
         * @hide
         */
        public static final String AUTOMATIC_STORAGE_MANAGER_DAYS_TO_RETAIN =
                "automatic_storage_manager_days_to_retain";

        private static final Validator AUTOMATIC_STORAGE_MANAGER_DAYS_TO_RETAIN_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * Default number of days of information for the automatic storage manager to retain.
         *
         * @hide
         */
        public static final int AUTOMATIC_STORAGE_MANAGER_DAYS_TO_RETAIN_DEFAULT = 90;

        /**
         * How many bytes the automatic storage manager has cleared out.
         *
         * @hide
         */
        public static final String AUTOMATIC_STORAGE_MANAGER_BYTES_CLEARED =
                "automatic_storage_manager_bytes_cleared";


        /**
         * Last run time for the automatic storage manager.
         *
         * @hide
         */
        public static final String AUTOMATIC_STORAGE_MANAGER_LAST_RUN =
                "automatic_storage_manager_last_run";

        /**
         * If the automatic storage manager has been disabled by policy. Note that this doesn't
         * mean that the automatic storage manager is prevented from being re-enabled -- this only
         * means that it was turned off by policy at least once.
         *
         * @hide
         */
        public static final String AUTOMATIC_STORAGE_MANAGER_TURNED_OFF_BY_POLICY =
                "automatic_storage_manager_turned_off_by_policy";

        /**
         * Whether SystemUI navigation keys is enabled.
         * @hide
         */
        public static final String SYSTEM_NAVIGATION_KEYS_ENABLED =
                "system_navigation_keys_enabled";

        private static final Validator SYSTEM_NAVIGATION_KEYS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Holds comma separated list of ordering of QS tiles.
         * @hide
         */
        public static final String QS_TILES = "sysui_qs_tiles";

        private static final Validator QS_TILES_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                if (value == null) {
                    return false;
                }
                String[] tiles = value.split(",");
                boolean valid = true;
                for (String tile : tiles) {
                    // tile can be any non-empty string as specified by OEM
                    valid |= ((tile.length() > 0) && ANY_STRING_VALIDATOR.validate(tile));
                }
                return valid;
            }
        };

        /**
         * Specifies whether the web action API is enabled.
         *
         * @hide
         */
        @SystemApi
        public static final String INSTANT_APPS_ENABLED = "instant_apps_enabled";

        /**
         * Has this pairable device been paired or upgraded from a previously paired system.
         * @hide
         */
        public static final String DEVICE_PAIRED = "device_paired";

        /**
         * Integer state indicating whether package verifier is enabled.
         * TODO(b/34259924): Remove this setting.
         *
         * @hide
         */
        public static final String PACKAGE_VERIFIER_STATE = "package_verifier_state";

        /**
         * Specifies additional package name for broadcasting the CMAS messages.
         * @hide
         */
        public static final String CMAS_ADDITIONAL_BROADCAST_PKG = "cmas_additional_broadcast_pkg";

        /**
         * Whether the launcher should show any notification badges.
         * The value is boolean (1 or 0).
         * @hide
         */
        public static final String NOTIFICATION_BADGING = "notification_badging";

        private static final Validator NOTIFICATION_BADGING_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Comma separated list of QS tiles that have been auto-added already.
         * @hide
         */
        public static final String QS_AUTO_ADDED_TILES = "qs_auto_tiles";

        private static final Validator QS_AUTO_ADDED_TILES_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                if (value == null) {
                    return false;
                }
                String[] tiles = value.split(",");
                boolean valid = true;
                for (String tile : tiles) {
                    // tile can be any non-empty string as specified by OEM
                    valid |= ((tile.length() > 0) && ANY_STRING_VALIDATOR.validate(tile));
                }
                return valid;
            }
        };

        /**
         * Whether the Lockdown button should be shown in the power menu.
         * @hide
         */
        public static final String LOCKDOWN_IN_POWER_MENU = "lockdown_in_power_menu";

        private static final Validator LOCKDOWN_IN_POWER_MENU_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Backup manager behavioral parameters.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "key_value_backup_interval_milliseconds=14400000,key_value_backup_require_charging=true"
         *
         * The following keys are supported:
         *
         * <pre>
         * key_value_backup_interval_milliseconds  (long)
         * key_value_backup_fuzz_milliseconds      (long)
         * key_value_backup_require_charging       (boolean)
         * key_value_backup_required_network_type  (int)
         * full_backup_interval_milliseconds       (long)
         * full_backup_require_charging            (boolean)
         * full_backup_required_network_type       (int)
         * backup_finished_notification_receivers  (String[])
         * </pre>
         *
         * backup_finished_notification_receivers uses ":" as delimeter for values.
         *
         * <p>
         * Type: string
         * @hide
         */
        public static final String BACKUP_MANAGER_CONSTANTS = "backup_manager_constants";


        /**
         * Local transport parameters so we can configure it for tests.
         * This is encoded as a key=value list, separated by commas.
         *
         * The following keys are supported:
         *
         * <pre>
         * fake_encryption_flag  (boolean)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         */
        public static final String BACKUP_LOCAL_TRANSPORT_PARAMETERS =
                "backup_local_transport_parameters";

        /**
         * Flag to set if the system should predictively attempt to re-enable Bluetooth while
         * the user is driving.
         * @hide
         */
        public static final String BLUETOOTH_ON_WHILE_DRIVING = "bluetooth_on_while_driving";

        /**
         * What behavior should be invoked when the volume hush gesture is triggered
         * One of VOLUME_HUSH_OFF, VOLUME_HUSH_VIBRATE, VOLUME_HUSH_MUTE.
         *
         * @hide
         */
        public static final String VOLUME_HUSH_GESTURE = "volume_hush_gesture";

        /** @hide */ public static final int VOLUME_HUSH_OFF = 0;
        /** @hide */ public static final int VOLUME_HUSH_VIBRATE = 1;
        /** @hide */ public static final int VOLUME_HUSH_MUTE = 2;

        private static final Validator VOLUME_HUSH_GESTURE_VALIDATOR =
                NON_NEGATIVE_INTEGER_VALIDATOR;

        /**
         * The number of times (integer) the user has manually enabled battery saver.
         * @hide
         */
        public static final String LOW_POWER_MANUAL_ACTIVATION_COUNT =
                "low_power_manual_activation_count";

        /**
         * Whether the "first time battery saver warning" dialog needs to be shown (0: default)
         * or not (1).
         *
         * @hide
         */
        public static final String LOW_POWER_WARNING_ACKNOWLEDGED =
                "low_power_warning_acknowledged";

        /**
         * 0 (default) Auto battery saver suggestion has not been suppressed. 1) it has been
         * suppressed.
         * @hide
         */
        public static final String SUPPRESS_AUTO_BATTERY_SAVER_SUGGESTION =
                "suppress_auto_battery_saver_suggestion";

        /**
         * This are the settings to be backed up.
         *
         * NOTE: Settings are backed up and restored in the order they appear
         *       in this array. If you have one setting depending on another,
         *       make sure that they are ordered appropriately.
         *
         * @hide
         */
        public static final String[] SETTINGS_TO_BACKUP = {
            BUGREPORT_IN_POWER_MENU,                            // moved to global
            ALLOW_MOCK_LOCATION,
            USB_MASS_STORAGE_ENABLED,                           // moved to global
            ACCESSIBILITY_DISPLAY_INVERSION_ENABLED,
            ACCESSIBILITY_DISPLAY_DALTONIZER,
            ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED,
            ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED,
            ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED,
            AUTOFILL_SERVICE,
            ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE,
            ENABLED_ACCESSIBILITY_SERVICES,
            ENABLED_VR_LISTENERS,
            TOUCH_EXPLORATION_GRANTED_ACCESSIBILITY_SERVICES,
            TOUCH_EXPLORATION_ENABLED,
            ACCESSIBILITY_ENABLED,
            ACCESSIBILITY_SHORTCUT_TARGET_SERVICE,
            ACCESSIBILITY_BUTTON_TARGET_COMPONENT,
            ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN,
            ACCESSIBILITY_SHORTCUT_ENABLED,
            ACCESSIBILITY_SHORTCUT_ON_LOCK_SCREEN,
            ACCESSIBILITY_SPEAK_PASSWORD,
            ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED,
            ACCESSIBILITY_CAPTIONING_PRESET,
            ACCESSIBILITY_CAPTIONING_ENABLED,
            ACCESSIBILITY_CAPTIONING_LOCALE,
            ACCESSIBILITY_CAPTIONING_BACKGROUND_COLOR,
            ACCESSIBILITY_CAPTIONING_FOREGROUND_COLOR,
            ACCESSIBILITY_CAPTIONING_EDGE_TYPE,
            ACCESSIBILITY_CAPTIONING_EDGE_COLOR,
            ACCESSIBILITY_CAPTIONING_TYPEFACE,
            ACCESSIBILITY_CAPTIONING_FONT_SCALE,
            ACCESSIBILITY_CAPTIONING_WINDOW_COLOR,
            TTS_DEFAULT_RATE,
            TTS_DEFAULT_PITCH,
            TTS_DEFAULT_SYNTH,
            TTS_ENABLED_PLUGINS,
            TTS_DEFAULT_LOCALE,
            SHOW_IME_WITH_HARD_KEYBOARD,
            WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON,            // moved to global
            WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY,               // moved to global
            WIFI_NUM_OPEN_NETWORKS_KEPT,                        // moved to global
            SELECTED_SPELL_CHECKER,
            SELECTED_SPELL_CHECKER_SUBTYPE,
            SPELL_CHECKER_ENABLED,
            MOUNT_PLAY_NOTIFICATION_SND,
            MOUNT_UMS_AUTOSTART,
            MOUNT_UMS_PROMPT,
            MOUNT_UMS_NOTIFY_ENABLED,
            SLEEP_TIMEOUT,
            DOUBLE_TAP_TO_WAKE,
            WAKE_GESTURE_ENABLED,
            LONG_PRESS_TIMEOUT,
            CAMERA_GESTURE_DISABLED,
            ACCESSIBILITY_AUTOCLICK_ENABLED,
            ACCESSIBILITY_AUTOCLICK_DELAY,
            ACCESSIBILITY_LARGE_POINTER_ICON,
            PREFERRED_TTY_MODE,
            ENHANCED_VOICE_PRIVACY_ENABLED,
            TTY_MODE_ENABLED,
            INCALL_POWER_BUTTON_BEHAVIOR,
            NIGHT_DISPLAY_CUSTOM_START_TIME,
            NIGHT_DISPLAY_CUSTOM_END_TIME,
            NIGHT_DISPLAY_COLOR_TEMPERATURE,
            NIGHT_DISPLAY_AUTO_MODE,
            SYNC_PARENT_SOUNDS,
            CAMERA_DOUBLE_TWIST_TO_FLIP_ENABLED,
            CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED,
            SYSTEM_NAVIGATION_KEYS_ENABLED,
            QS_TILES,
            DOZE_ENABLED,
            DOZE_PULSE_ON_PICK_UP,
            DOZE_PULSE_ON_DOUBLE_TAP,
            NFC_PAYMENT_DEFAULT_COMPONENT,
            AUTOMATIC_STORAGE_MANAGER_DAYS_TO_RETAIN,
            ASSIST_GESTURE_ENABLED,
            ASSIST_GESTURE_SENSITIVITY,
            ASSIST_GESTURE_SETUP_COMPLETE,
            ASSIST_GESTURE_SILENCE_ALERTS_ENABLED,
            ASSIST_GESTURE_WAKE_ENABLED,
            VR_DISPLAY_MODE,
            NOTIFICATION_BADGING,
            QS_AUTO_ADDED_TILES,
            SCREENSAVER_ENABLED,
            SCREENSAVER_COMPONENTS,
            SCREENSAVER_ACTIVATE_ON_DOCK,
            SCREENSAVER_ACTIVATE_ON_SLEEP,
            LOCKDOWN_IN_POWER_MENU,
            SHOW_FIRST_CRASH_DIALOG_DEV_OPTION,
            VOLUME_HUSH_GESTURE
        };

        /**
         * All settings in {@link SETTINGS_TO_BACKUP} array *must* have a non-null validator,
         * otherwise they won't be restored.
         *
         * @hide
         */
        public static final Map<String, Validator> VALIDATORS = new ArrayMap<>();
        static {
            VALIDATORS.put(BUGREPORT_IN_POWER_MENU, BUGREPORT_IN_POWER_MENU_VALIDATOR);
            VALIDATORS.put(ALLOW_MOCK_LOCATION, ALLOW_MOCK_LOCATION_VALIDATOR);
            VALIDATORS.put(USB_MASS_STORAGE_ENABLED, USB_MASS_STORAGE_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_DISPLAY_INVERSION_ENABLED,
                    ACCESSIBILITY_DISPLAY_INVERSION_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_DISPLAY_DALTONIZER,
                    ACCESSIBILITY_DISPLAY_DALTONIZER_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED,
                    ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED,
                    ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED,
                    ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED_VALIDATOR);
            VALIDATORS.put(AUTOFILL_SERVICE, AUTOFILL_SERVICE_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE,
                    ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE_VALIDATOR);
            VALIDATORS.put(ENABLED_ACCESSIBILITY_SERVICES,
                    ENABLED_ACCESSIBILITY_SERVICES_VALIDATOR);
            VALIDATORS.put(ENABLED_VR_LISTENERS, ENABLED_VR_LISTENERS_VALIDATOR);
            VALIDATORS.put(TOUCH_EXPLORATION_GRANTED_ACCESSIBILITY_SERVICES,
                    TOUCH_EXPLORATION_GRANTED_ACCESSIBILITY_SERVICES_VALIDATOR);
            VALIDATORS.put(TOUCH_EXPLORATION_ENABLED, TOUCH_EXPLORATION_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_ENABLED, ACCESSIBILITY_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_SHORTCUT_TARGET_SERVICE,
                    ACCESSIBILITY_SHORTCUT_TARGET_SERVICE_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_BUTTON_TARGET_COMPONENT,
                    ACCESSIBILITY_BUTTON_TARGET_COMPONENT_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN,
                    ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_SHORTCUT_ENABLED,
                    ACCESSIBILITY_SHORTCUT_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_SHORTCUT_ON_LOCK_SCREEN,
                    ACCESSIBILITY_SHORTCUT_ON_LOCK_SCREEN_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_SPEAK_PASSWORD, ACCESSIBILITY_SPEAK_PASSWORD_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED,
                    ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_PRESET,
                    ACCESSIBILITY_CAPTIONING_PRESET_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_ENABLED,
                    ACCESSIBILITY_CAPTIONING_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_LOCALE,
                    ACCESSIBILITY_CAPTIONING_LOCALE_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_BACKGROUND_COLOR,
                    ACCESSIBILITY_CAPTIONING_BACKGROUND_COLOR_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_FOREGROUND_COLOR,
                    ACCESSIBILITY_CAPTIONING_FOREGROUND_COLOR_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_EDGE_TYPE,
                    ACCESSIBILITY_CAPTIONING_EDGE_TYPE_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_EDGE_COLOR,
                    ACCESSIBILITY_CAPTIONING_EDGE_COLOR_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_TYPEFACE,
                    ACCESSIBILITY_CAPTIONING_TYPEFACE_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_FONT_SCALE,
                    ACCESSIBILITY_CAPTIONING_FONT_SCALE_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_CAPTIONING_WINDOW_COLOR,
                    ACCESSIBILITY_CAPTIONING_WINDOW_COLOR_VALIDATOR);
            VALIDATORS.put(TTS_DEFAULT_RATE, TTS_DEFAULT_RATE_VALIDATOR);
            VALIDATORS.put(TTS_DEFAULT_PITCH, TTS_DEFAULT_PITCH_VALIDATOR);
            VALIDATORS.put(TTS_DEFAULT_SYNTH, TTS_DEFAULT_SYNTH_VALIDATOR);
            VALIDATORS.put(TTS_ENABLED_PLUGINS, TTS_ENABLED_PLUGINS_VALIDATOR);
            VALIDATORS.put(TTS_DEFAULT_LOCALE, TTS_DEFAULT_LOCALE_VALIDATOR);
            VALIDATORS.put(SHOW_IME_WITH_HARD_KEYBOARD, SHOW_IME_WITH_HARD_KEYBOARD_VALIDATOR);
            VALIDATORS.put(WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON,
                    WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON_VALIDATOR);
            VALIDATORS.put(WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY,
                    WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY_VALIDATOR);
            VALIDATORS.put(WIFI_NUM_OPEN_NETWORKS_KEPT, WIFI_NUM_OPEN_NETWORKS_KEPT_VALIDATOR);
            VALIDATORS.put(SELECTED_SPELL_CHECKER, SELECTED_SPELL_CHECKER_VALIDATOR);
            VALIDATORS.put(SELECTED_SPELL_CHECKER_SUBTYPE,
                    SELECTED_SPELL_CHECKER_SUBTYPE_VALIDATOR);
            VALIDATORS.put(SPELL_CHECKER_ENABLED, SPELL_CHECKER_ENABLED_VALIDATOR);
            VALIDATORS.put(MOUNT_PLAY_NOTIFICATION_SND, MOUNT_PLAY_NOTIFICATION_SND_VALIDATOR);
            VALIDATORS.put(MOUNT_UMS_AUTOSTART, MOUNT_UMS_AUTOSTART_VALIDATOR);
            VALIDATORS.put(MOUNT_UMS_PROMPT, MOUNT_UMS_PROMPT_VALIDATOR);
            VALIDATORS.put(MOUNT_UMS_NOTIFY_ENABLED, MOUNT_UMS_NOTIFY_ENABLED_VALIDATOR);
            VALIDATORS.put(SLEEP_TIMEOUT, SLEEP_TIMEOUT_VALIDATOR);
            VALIDATORS.put(DOUBLE_TAP_TO_WAKE, DOUBLE_TAP_TO_WAKE_VALIDATOR);
            VALIDATORS.put(WAKE_GESTURE_ENABLED, WAKE_GESTURE_ENABLED_VALIDATOR);
            VALIDATORS.put(LONG_PRESS_TIMEOUT, LONG_PRESS_TIMEOUT_VALIDATOR);
            VALIDATORS.put(CAMERA_GESTURE_DISABLED, CAMERA_GESTURE_DISABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_AUTOCLICK_ENABLED,
                    ACCESSIBILITY_AUTOCLICK_ENABLED_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_AUTOCLICK_DELAY, ACCESSIBILITY_AUTOCLICK_DELAY_VALIDATOR);
            VALIDATORS.put(ACCESSIBILITY_LARGE_POINTER_ICON,
                    ACCESSIBILITY_LARGE_POINTER_ICON_VALIDATOR);
            VALIDATORS.put(PREFERRED_TTY_MODE, PREFERRED_TTY_MODE_VALIDATOR);
            VALIDATORS.put(ENHANCED_VOICE_PRIVACY_ENABLED,
                    ENHANCED_VOICE_PRIVACY_ENABLED_VALIDATOR);
            VALIDATORS.put(TTY_MODE_ENABLED, TTY_MODE_ENABLED_VALIDATOR);
            VALIDATORS.put(INCALL_POWER_BUTTON_BEHAVIOR, INCALL_POWER_BUTTON_BEHAVIOR_VALIDATOR);
            VALIDATORS.put(NIGHT_DISPLAY_CUSTOM_START_TIME,
                    NIGHT_DISPLAY_CUSTOM_START_TIME_VALIDATOR);
            VALIDATORS.put(NIGHT_DISPLAY_CUSTOM_END_TIME, NIGHT_DISPLAY_CUSTOM_END_TIME_VALIDATOR);
            VALIDATORS.put(NIGHT_DISPLAY_COLOR_TEMPERATURE,
                    NIGHT_DISPLAY_COLOR_TEMPERATURE_VALIDATOR);
            VALIDATORS.put(NIGHT_DISPLAY_AUTO_MODE, NIGHT_DISPLAY_AUTO_MODE_VALIDATOR);
            VALIDATORS.put(SYNC_PARENT_SOUNDS, SYNC_PARENT_SOUNDS_VALIDATOR);
            VALIDATORS.put(CAMERA_DOUBLE_TWIST_TO_FLIP_ENABLED,
                    CAMERA_DOUBLE_TWIST_TO_FLIP_ENABLED_VALIDATOR);
            VALIDATORS.put(CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED,
                    CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED_VALIDATOR);
            VALIDATORS.put(SYSTEM_NAVIGATION_KEYS_ENABLED,
                    SYSTEM_NAVIGATION_KEYS_ENABLED_VALIDATOR);
            VALIDATORS.put(QS_TILES, QS_TILES_VALIDATOR);
            VALIDATORS.put(DOZE_ENABLED, DOZE_ENABLED_VALIDATOR);
            VALIDATORS.put(DOZE_PULSE_ON_PICK_UP, DOZE_PULSE_ON_PICK_UP_VALIDATOR);
            VALIDATORS.put(DOZE_PULSE_ON_DOUBLE_TAP, DOZE_PULSE_ON_DOUBLE_TAP_VALIDATOR);
            VALIDATORS.put(NFC_PAYMENT_DEFAULT_COMPONENT, NFC_PAYMENT_DEFAULT_COMPONENT_VALIDATOR);
            VALIDATORS.put(AUTOMATIC_STORAGE_MANAGER_DAYS_TO_RETAIN,
                    AUTOMATIC_STORAGE_MANAGER_DAYS_TO_RETAIN_VALIDATOR);
            VALIDATORS.put(ASSIST_GESTURE_ENABLED, ASSIST_GESTURE_ENABLED_VALIDATOR);
            VALIDATORS.put(ASSIST_GESTURE_SENSITIVITY, ASSIST_GESTURE_SENSITIVITY_VALIDATOR);
            VALIDATORS.put(ASSIST_GESTURE_SETUP_COMPLETE, ASSIST_GESTURE_SETUP_COMPLETE_VALIDATOR);
            VALIDATORS.put(ASSIST_GESTURE_SILENCE_ALERTS_ENABLED,
                    ASSIST_GESTURE_SILENCE_ALERTS_ENABLED_VALIDATOR);
            VALIDATORS.put(ASSIST_GESTURE_WAKE_ENABLED, ASSIST_GESTURE_WAKE_ENABLED_VALIDATOR);
            VALIDATORS.put(VR_DISPLAY_MODE, VR_DISPLAY_MODE_VALIDATOR);
            VALIDATORS.put(NOTIFICATION_BADGING, NOTIFICATION_BADGING_VALIDATOR);
            VALIDATORS.put(QS_AUTO_ADDED_TILES, QS_AUTO_ADDED_TILES_VALIDATOR);
            VALIDATORS.put(SCREENSAVER_ENABLED, SCREENSAVER_ENABLED_VALIDATOR);
            VALIDATORS.put(SCREENSAVER_COMPONENTS, SCREENSAVER_COMPONENTS_VALIDATOR);
            VALIDATORS.put(SCREENSAVER_ACTIVATE_ON_DOCK, SCREENSAVER_ACTIVATE_ON_DOCK_VALIDATOR);
            VALIDATORS.put(SCREENSAVER_ACTIVATE_ON_SLEEP, SCREENSAVER_ACTIVATE_ON_SLEEP_VALIDATOR);
            VALIDATORS.put(LOCKDOWN_IN_POWER_MENU, LOCKDOWN_IN_POWER_MENU_VALIDATOR);
            VALIDATORS.put(SHOW_FIRST_CRASH_DIALOG_DEV_OPTION,
                    SHOW_FIRST_CRASH_DIALOG_DEV_OPTION_VALIDATOR);
            VALIDATORS.put(VOLUME_HUSH_GESTURE, VOLUME_HUSH_GESTURE_VALIDATOR);
            VALIDATORS.put(ENABLED_NOTIFICATION_LISTENERS,
                    ENABLED_NOTIFICATION_LISTENERS_VALIDATOR); //legacy restore setting
            VALIDATORS.put(ENABLED_NOTIFICATION_ASSISTANT,
                    ENABLED_NOTIFICATION_ASSISTANT_VALIDATOR); //legacy restore setting
            VALIDATORS.put(ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES,
                    ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES_VALIDATOR); //legacy restore setting
        }

        /**
         * Keys we no longer back up under the current schema, but want to continue to
         * process when restoring historical backup datasets.
         *
         * All settings in {@link LEGACY_RESTORE_SETTINGS} array *must* have a non-null validator,
         * otherwise they won't be restored.
         *
         * @hide
         */
        public static final String[] LEGACY_RESTORE_SETTINGS = {
                ENABLED_NOTIFICATION_LISTENERS,
                ENABLED_NOTIFICATION_ASSISTANT,
                ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES
        };

        /**
         * These entries are considered common between the personal and the managed profile,
         * since the managed profile doesn't get to change them.
         */
        private static final Set<String> CLONE_TO_MANAGED_PROFILE = new ArraySet<>();

        static {
            CLONE_TO_MANAGED_PROFILE.add(ACCESSIBILITY_ENABLED);
            CLONE_TO_MANAGED_PROFILE.add(ALLOW_MOCK_LOCATION);
            CLONE_TO_MANAGED_PROFILE.add(ALLOWED_GEOLOCATION_ORIGINS);
            CLONE_TO_MANAGED_PROFILE.add(AUTOFILL_SERVICE);
            CLONE_TO_MANAGED_PROFILE.add(DEFAULT_INPUT_METHOD);
            CLONE_TO_MANAGED_PROFILE.add(ENABLED_ACCESSIBILITY_SERVICES);
            CLONE_TO_MANAGED_PROFILE.add(ENABLED_INPUT_METHODS);
            CLONE_TO_MANAGED_PROFILE.add(LOCATION_CHANGER);
            CLONE_TO_MANAGED_PROFILE.add(LOCATION_MODE);
            CLONE_TO_MANAGED_PROFILE.add(LOCATION_PROVIDERS_ALLOWED);
            CLONE_TO_MANAGED_PROFILE.add(SELECTED_INPUT_METHOD_SUBTYPE);
            if (TextServicesManager.DISABLE_PER_PROFILE_SPELL_CHECKER) {
                CLONE_TO_MANAGED_PROFILE.add(SELECTED_SPELL_CHECKER);
                CLONE_TO_MANAGED_PROFILE.add(SELECTED_SPELL_CHECKER_SUBTYPE);
            }
        }

        /** @hide */
        public static void getCloneToManagedProfileSettings(Set<String> outKeySet) {
            outKeySet.addAll(CLONE_TO_MANAGED_PROFILE);
        }

        /**
         * Secure settings which can be accessed by instant apps.
         * @hide
         */
        public static final Set<String> INSTANT_APP_SETTINGS = new ArraySet<>();
        static {
            INSTANT_APP_SETTINGS.add(ENABLED_ACCESSIBILITY_SERVICES);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_SPEAK_PASSWORD);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_DISPLAY_INVERSION_ENABLED);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_ENABLED);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_PRESET);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_EDGE_TYPE);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_EDGE_COLOR);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_LOCALE);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_BACKGROUND_COLOR);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_FOREGROUND_COLOR);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_TYPEFACE);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_FONT_SCALE);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_CAPTIONING_WINDOW_COLOR);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_DISPLAY_DALTONIZER);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_AUTOCLICK_DELAY);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_AUTOCLICK_ENABLED);
            INSTANT_APP_SETTINGS.add(ACCESSIBILITY_LARGE_POINTER_ICON);

            INSTANT_APP_SETTINGS.add(DEFAULT_INPUT_METHOD);
            INSTANT_APP_SETTINGS.add(ENABLED_INPUT_METHODS);

            INSTANT_APP_SETTINGS.add(ANDROID_ID);

            INSTANT_APP_SETTINGS.add(PACKAGE_VERIFIER_USER_CONSENT);
            INSTANT_APP_SETTINGS.add(ALLOW_MOCK_LOCATION);
        }

        /**
         * Helper method for determining if a location provider is enabled.
         *
         * @param cr the content resolver to use
         * @param provider the location provider to query
         * @return true if the provider is enabled
         *
         * @deprecated use {@link LocationManager#isProviderEnabled(String)}
         */
        @Deprecated
        public static final boolean isLocationProviderEnabled(ContentResolver cr, String provider) {
            return isLocationProviderEnabledForUser(cr, provider, cr.getUserId());
        }

        /**
         * Helper method for determining if a location provider is enabled.
         * @param cr the content resolver to use
         * @param provider the location provider to query
         * @param userId the userId to query
         * @return true if the provider is enabled
         *
         * @deprecated use {@link LocationManager#isProviderEnabled(String)}
         * @hide
         */
        @Deprecated
        public static final boolean isLocationProviderEnabledForUser(
                ContentResolver cr, String provider, int userId) {
            String allowedProviders = Settings.Secure.getStringForUser(cr,
                    LOCATION_PROVIDERS_ALLOWED, userId);
            return TextUtils.delimitedStringContains(allowedProviders, ',', provider);
        }

        /**
         * Thread-safe method for enabling or disabling a single location provider.
         * @param cr the content resolver to use
         * @param provider the location provider to enable or disable
         * @param enabled true if the provider should be enabled
         * @deprecated This API is deprecated. It requires WRITE_SECURE_SETTINGS permission to
         *             change location settings.
         */
        @Deprecated
        public static final void setLocationProviderEnabled(ContentResolver cr,
                String provider, boolean enabled) {
            setLocationProviderEnabledForUser(cr, provider, enabled, cr.getUserId());
        }

        /**
         * Thread-safe method for enabling or disabling a single location provider.
         *
         * @param cr the content resolver to use
         * @param provider the location provider to enable or disable
         * @param enabled true if the provider should be enabled
         * @param userId the userId for which to enable/disable providers
         * @return true if the value was set, false on database errors
         *
         * @deprecated use {@link LocationManager#setProviderEnabledForUser(String, boolean, int)}
         * @hide
         */
        @Deprecated
        public static final boolean setLocationProviderEnabledForUser(ContentResolver cr,
                String provider, boolean enabled, int userId) {
            synchronized (mLocationSettingsLock) {
                // to ensure thread safety, we write the provider name with a '+' or '-'
                // and let the SettingsProvider handle it rather than reading and modifying
                // the list of enabled providers.
                if (enabled) {
                    provider = "+" + provider;
                } else {
                    provider = "-" + provider;
                }
                return putStringForUser(cr, Settings.Secure.LOCATION_PROVIDERS_ALLOWED, provider,
                        userId);
            }
        }

        /**
         * Thread-safe method for setting the location mode to one of
         * {@link #LOCATION_MODE_HIGH_ACCURACY}, {@link #LOCATION_MODE_SENSORS_ONLY},
         * {@link #LOCATION_MODE_BATTERY_SAVING}, or {@link #LOCATION_MODE_OFF}.
         * Necessary because the mode is a composite of the underlying location provider
         * settings.
         *
         * @param cr the content resolver to use
         * @param mode such as {@link #LOCATION_MODE_HIGH_ACCURACY}
         * @param userId the userId for which to change mode
         * @return true if the value was set, false on database errors
         *
         * @throws IllegalArgumentException if mode is not one of the supported values
         *
         * @deprecated To enable/disable location, use
         *             {@link LocationManager#setLocationEnabledForUser(boolean, int)}.
         *             To enable/disable a specific location provider, use
         *             {@link LocationManager#setProviderEnabledForUser(String, boolean, int)}.
         */
        @Deprecated
        private static boolean setLocationModeForUser(
                ContentResolver cr, int mode, int userId) {
            synchronized (mLocationSettingsLock) {
                boolean gps = false;
                boolean network = false;
                switch (mode) {
                    case LOCATION_MODE_OFF:
                        break;
                    case LOCATION_MODE_SENSORS_ONLY:
                        gps = true;
                        break;
                    case LOCATION_MODE_BATTERY_SAVING:
                        network = true;
                        break;
                    case LOCATION_MODE_HIGH_ACCURACY:
                        gps = true;
                        network = true;
                        break;
                    default:
                        throw new IllegalArgumentException("Invalid location mode: " + mode);
                }

                boolean nlpSuccess = Settings.Secure.setLocationProviderEnabledForUser(
                        cr, LocationManager.NETWORK_PROVIDER, network, userId);
                boolean gpsSuccess = Settings.Secure.setLocationProviderEnabledForUser(
                        cr, LocationManager.GPS_PROVIDER, gps, userId);
                return gpsSuccess && nlpSuccess;
            }
        }

        /**
         * Thread-safe method for reading the location mode, returns one of
         * {@link #LOCATION_MODE_HIGH_ACCURACY}, {@link #LOCATION_MODE_SENSORS_ONLY},
         * {@link #LOCATION_MODE_BATTERY_SAVING}, or {@link #LOCATION_MODE_OFF}. Necessary
         * because the mode is a composite of the underlying location provider settings.
         *
         * @param cr the content resolver to use
         * @param userId the userId for which to read the mode
         * @return the location mode
         */
        private static final int getLocationModeForUser(ContentResolver cr, int userId) {
            synchronized (mLocationSettingsLock) {
                boolean gpsEnabled = Settings.Secure.isLocationProviderEnabledForUser(
                        cr, LocationManager.GPS_PROVIDER, userId);
                boolean networkEnabled = Settings.Secure.isLocationProviderEnabledForUser(
                        cr, LocationManager.NETWORK_PROVIDER, userId);
                if (gpsEnabled && networkEnabled) {
                    return LOCATION_MODE_HIGH_ACCURACY;
                } else if (gpsEnabled) {
                    return LOCATION_MODE_SENSORS_ONLY;
                } else if (networkEnabled) {
                    return LOCATION_MODE_BATTERY_SAVING;
                } else {
                    return LOCATION_MODE_OFF;
                }
            }
        }
    }

    /**
     * Global system settings, containing preferences that always apply identically
     * to all defined users.  Applications can read these but are not allowed to write;
     * like the "Secure" settings, these are for preferences that the user must
     * explicitly modify through the system UI or specialized APIs for those values.
     */
    public static final class Global extends NameValueTable {
        // NOTE: If you add new settings here, be sure to add them to
        // com.android.providers.settings.SettingsProtoDumpUtil#dumpProtoGlobalSettingsLocked.

        /**
         * The content:// style URL for global secure settings items.  Not public.
         */
        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/global");

        /**
         * Whether users are allowed to add more users or guest from lockscreen.
         * <p>
         * Type: int
         * @hide
         */
        public static final String ADD_USERS_WHEN_LOCKED = "add_users_when_locked";

        /**
         * Setting whether the global gesture for enabling accessibility is enabled.
         * If this gesture is enabled the user will be able to perfrom it to enable
         * the accessibility state without visiting the settings app.
         *
         * @hide
         * No longer used. Should be removed once all dependencies have been updated.
         */
        public static final String ENABLE_ACCESSIBILITY_GLOBAL_GESTURE_ENABLED =
                "enable_accessibility_global_gesture_enabled";

        /**
         * Whether Airplane Mode is on.
         */
        public static final String AIRPLANE_MODE_ON = "airplane_mode_on";

        /**
         * Whether Theater Mode is on.
         * {@hide}
         */
        @SystemApi
        public static final String THEATER_MODE_ON = "theater_mode_on";

        /**
         * Constant for use in AIRPLANE_MODE_RADIOS to specify Bluetooth radio.
         */
        public static final String RADIO_BLUETOOTH = "bluetooth";

        /**
         * Constant for use in AIRPLANE_MODE_RADIOS to specify Wi-Fi radio.
         */
        public static final String RADIO_WIFI = "wifi";

        /**
         * {@hide}
         */
        public static final String RADIO_WIMAX = "wimax";
        /**
         * Constant for use in AIRPLANE_MODE_RADIOS to specify Cellular radio.
         */
        public static final String RADIO_CELL = "cell";

        /**
         * Constant for use in AIRPLANE_MODE_RADIOS to specify NFC radio.
         */
        public static final String RADIO_NFC = "nfc";

        /**
         * A comma separated list of radios that need to be disabled when airplane mode
         * is on. This overrides WIFI_ON and BLUETOOTH_ON, if Wi-Fi and bluetooth are
         * included in the comma separated list.
         */
        public static final String AIRPLANE_MODE_RADIOS = "airplane_mode_radios";

        /**
         * A comma separated list of radios that should to be disabled when airplane mode
         * is on, but can be manually reenabled by the user.  For example, if RADIO_WIFI is
         * added to both AIRPLANE_MODE_RADIOS and AIRPLANE_MODE_TOGGLEABLE_RADIOS, then Wifi
         * will be turned off when entering airplane mode, but the user will be able to reenable
         * Wifi in the Settings app.
         *
         * {@hide}
         */
        public static final String AIRPLANE_MODE_TOGGLEABLE_RADIOS = "airplane_mode_toggleable_radios";

        /**
         * An integer representing the Bluetooth Class of Device (CoD).
         *
         * @hide
         */
        public static final String BLUETOOTH_CLASS_OF_DEVICE = "bluetooth_class_of_device";

        /**
         * A Long representing a bitmap of profiles that should be disabled when bluetooth starts.
         * See {@link android.bluetooth.BluetoothProfile}.
         * {@hide}
         */
        public static final String BLUETOOTH_DISABLED_PROFILES = "bluetooth_disabled_profiles";

        /**
         * A semi-colon separated list of Bluetooth interoperability workarounds.
         * Each entry is a partial Bluetooth device address string and an integer representing
         * the feature to be disabled, separated by a comma. The integer must correspond
         * to a interoperability feature as defined in "interop.h" in /system/bt.
         * <p>
         * Example: <br/>
         *   "00:11:22,0;01:02:03:04,2"
         * @hide
         */
       public static final String BLUETOOTH_INTEROPERABILITY_LIST = "bluetooth_interoperability_list";

        /**
         * The policy for deciding when Wi-Fi should go to sleep (which will in
         * turn switch to using the mobile data as an Internet connection).
         * <p>
         * Set to one of {@link #WIFI_SLEEP_POLICY_DEFAULT},
         * {@link #WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED}, or
         * {@link #WIFI_SLEEP_POLICY_NEVER}.
         */
        public static final String WIFI_SLEEP_POLICY = "wifi_sleep_policy";

        /**
         * Value for {@link #WIFI_SLEEP_POLICY} to use the default Wi-Fi sleep
         * policy, which is to sleep shortly after the turning off
         * according to the {@link #STAY_ON_WHILE_PLUGGED_IN} setting.
         */
        public static final int WIFI_SLEEP_POLICY_DEFAULT = 0;

        /**
         * Value for {@link #WIFI_SLEEP_POLICY} to use the default policy when
         * the device is on battery, and never go to sleep when the device is
         * plugged in.
         */
        public static final int WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED = 1;

        /**
         * Value for {@link #WIFI_SLEEP_POLICY} to never go to sleep.
         */
        public static final int WIFI_SLEEP_POLICY_NEVER = 2;

        /**
         * Value to specify if the user prefers the date, time and time zone
         * to be automatically fetched from the network (NITZ). 1=yes, 0=no
         */
        public static final String AUTO_TIME = "auto_time";

        private static final Validator AUTO_TIME_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Value to specify if the user prefers the time zone
         * to be automatically fetched from the network (NITZ). 1=yes, 0=no
         */
        public static final String AUTO_TIME_ZONE = "auto_time_zone";

        private static final Validator AUTO_TIME_ZONE_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * URI for the car dock "in" event sound.
         * @hide
         */
        public static final String CAR_DOCK_SOUND = "car_dock_sound";

        /**
         * URI for the car dock "out" event sound.
         * @hide
         */
        public static final String CAR_UNDOCK_SOUND = "car_undock_sound";

        /**
         * URI for the desk dock "in" event sound.
         * @hide
         */
        public static final String DESK_DOCK_SOUND = "desk_dock_sound";

        /**
         * URI for the desk dock "out" event sound.
         * @hide
         */
        public static final String DESK_UNDOCK_SOUND = "desk_undock_sound";

        /**
         * Whether to play a sound for dock events.
         * @hide
         */
        public static final String DOCK_SOUNDS_ENABLED = "dock_sounds_enabled";

        private static final Validator DOCK_SOUNDS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether to play a sound for dock events, only when an accessibility service is on.
         * @hide
         */
        public static final String DOCK_SOUNDS_ENABLED_WHEN_ACCESSIBILITY = "dock_sounds_enabled_when_accessbility";

        /**
         * URI for the "device locked" (keyguard shown) sound.
         * @hide
         */
        public static final String LOCK_SOUND = "lock_sound";

        /**
         * URI for the "device unlocked" sound.
         * @hide
         */
        public static final String UNLOCK_SOUND = "unlock_sound";

        /**
         * URI for the "device is trusted" sound, which is played when the device enters the trusted
         * state without unlocking.
         * @hide
         */
        public static final String TRUSTED_SOUND = "trusted_sound";

        /**
         * URI for the low battery sound file.
         * @hide
         */
        public static final String LOW_BATTERY_SOUND = "low_battery_sound";

        /**
         * Whether to play a sound for low-battery alerts.
         * @hide
         */
        public static final String POWER_SOUNDS_ENABLED = "power_sounds_enabled";

        private static final Validator POWER_SOUNDS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * URI for the "wireless charging started" and "wired charging started" sound.
         * @hide
         */
        public static final String CHARGING_STARTED_SOUND =
                "wireless_charging_started_sound";

        /**
         * Whether to play a sound for charging events.
         * @hide
         */
        public static final String CHARGING_SOUNDS_ENABLED = "charging_sounds_enabled";

        private static final Validator CHARGING_SOUNDS_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether we keep the device on while the device is plugged in.
         * Supported values are:
         * <ul>
         * <li>{@code 0} to never stay on while plugged in</li>
         * <li>{@link BatteryManager#BATTERY_PLUGGED_AC} to stay on for AC charger</li>
         * <li>{@link BatteryManager#BATTERY_PLUGGED_USB} to stay on for USB charger</li>
         * <li>{@link BatteryManager#BATTERY_PLUGGED_WIRELESS} to stay on for wireless charger</li>
         * </ul>
         * These values can be OR-ed together.
         */
        public static final String STAY_ON_WHILE_PLUGGED_IN = "stay_on_while_plugged_in";

        private static final Validator STAY_ON_WHILE_PLUGGED_IN_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                try {
                    int val = Integer.parseInt(value);
                    return (val == 0)
                            || (val == BatteryManager.BATTERY_PLUGGED_AC)
                            || (val == BatteryManager.BATTERY_PLUGGED_USB)
                            || (val == BatteryManager.BATTERY_PLUGGED_WIRELESS)
                            || (val == (BatteryManager.BATTERY_PLUGGED_AC
                                    | BatteryManager.BATTERY_PLUGGED_USB))
                            || (val == (BatteryManager.BATTERY_PLUGGED_AC
                                    | BatteryManager.BATTERY_PLUGGED_WIRELESS))
                            || (val == (BatteryManager.BATTERY_PLUGGED_USB
                                    | BatteryManager.BATTERY_PLUGGED_WIRELESS))
                            || (val == (BatteryManager.BATTERY_PLUGGED_AC
                                    | BatteryManager.BATTERY_PLUGGED_USB
                                    | BatteryManager.BATTERY_PLUGGED_WIRELESS));
                } catch (NumberFormatException e) {
                    return false;
                }
            }
        };

        /**
         * When the user has enable the option to have a "bug report" command
         * in the power menu.
         * @hide
         */
        public static final String BUGREPORT_IN_POWER_MENU = "bugreport_in_power_menu";

        private static final Validator BUGREPORT_IN_POWER_MENU_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Whether ADB is enabled.
         */
        public static final String ADB_ENABLED = "adb_enabled";

        /**
         * Whether Views are allowed to save their attribute data.
         * @hide
         */
        public static final String DEBUG_VIEW_ATTRIBUTES = "debug_view_attributes";

        /**
         * Whether assisted GPS should be enabled or not.
         * @hide
         */
        public static final String ASSISTED_GPS_ENABLED = "assisted_gps_enabled";

        /**
         * Whether bluetooth is enabled/disabled
         * 0=disabled. 1=enabled.
         */
        public static final String BLUETOOTH_ON = "bluetooth_on";

        private static final Validator BLUETOOTH_ON_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * CDMA Cell Broadcast SMS
         *                            0 = CDMA Cell Broadcast SMS disabled
         *                            1 = CDMA Cell Broadcast SMS enabled
         * @hide
         */
        public static final String CDMA_CELL_BROADCAST_SMS =
                "cdma_cell_broadcast_sms";

        /**
         * The CDMA roaming mode 0 = Home Networks, CDMA default
         *                       1 = Roaming on Affiliated networks
         *                       2 = Roaming on any networks
         * @hide
         */
        public static final String CDMA_ROAMING_MODE = "roaming_settings";

        /**
         * The CDMA subscription mode 0 = RUIM/SIM (default)
         *                                1 = NV
         * @hide
         */
        public static final String CDMA_SUBSCRIPTION_MODE = "subscription_mode";

        /**
         * The default value for whether background data is enabled or not.
         *
         * Used by {@code NetworkPolicyManagerService}.
         *
         * @hide
         */
        public static final String DEFAULT_RESTRICT_BACKGROUND_DATA =
                "default_restrict_background_data";

        /** Inactivity timeout to track mobile data activity.
        *
        * If set to a positive integer, it indicates the inactivity timeout value in seconds to
        * infer the data activity of mobile network. After a period of no activity on mobile
        * networks with length specified by the timeout, an {@code ACTION_DATA_ACTIVITY_CHANGE}
        * intent is fired to indicate a transition of network status from "active" to "idle". Any
        * subsequent activity on mobile networks triggers the firing of {@code
        * ACTION_DATA_ACTIVITY_CHANGE} intent indicating transition from "idle" to "active".
        *
        * Network activity refers to transmitting or receiving data on the network interfaces.
        *
        * Tracking is disabled if set to zero or negative value.
        *
        * @hide
        */
       public static final String DATA_ACTIVITY_TIMEOUT_MOBILE = "data_activity_timeout_mobile";

       /** Timeout to tracking Wifi data activity. Same as {@code DATA_ACTIVITY_TIMEOUT_MOBILE}
        * but for Wifi network.
        * @hide
        */
       public static final String DATA_ACTIVITY_TIMEOUT_WIFI = "data_activity_timeout_wifi";

       /**
        * Whether or not data roaming is enabled. (0 = false, 1 = true)
        */
       public static final String DATA_ROAMING = "data_roaming";

       /**
        * The value passed to a Mobile DataConnection via bringUp which defines the
        * number of retries to preform when setting up the initial connection. The default
        * value defined in DataConnectionTrackerBase#DEFAULT_MDC_INITIAL_RETRY is currently 1.
        * @hide
        */
       public static final String MDC_INITIAL_MAX_RETRY = "mdc_initial_max_retry";

       /**
        * Whether any package can be on external storage. When this is true, any
        * package, regardless of manifest values, is a candidate for installing
        * or moving onto external storage. (0 = false, 1 = true)
        * @hide
        */
       public static final String FORCE_ALLOW_ON_EXTERNAL = "force_allow_on_external";

        /**
         * The default SM-DP+ configured for this device.
         *
         * <p>An SM-DP+ is used by an LPA (see {@link android.service.euicc.EuiccService}) to
         * download profiles. If this value is set, the LPA will query this server for any profiles
         * available to this device. If any are available, they may be downloaded during device
         * provisioning or in settings without needing the user to enter an activation code.
         *
         * @see android.service.euicc.EuiccService
         * @hide
         */
        @SystemApi
        public static final String DEFAULT_SM_DP_PLUS = "default_sm_dp_plus";

        /**
         * Whether any profile has ever been downloaded onto a eUICC on the device.
         *
         * <p>Used to hide eUICC UI from users who have never made use of it and would only be
         * confused by seeing references to it in settings.
         * (0 = false, 1 = true)
         * @hide
         */
        @SystemApi
        public static final String EUICC_PROVISIONED = "euicc_provisioned";

        /**
         * Whether any activity can be resized. When this is true, any
         * activity, regardless of manifest values, can be resized for multi-window.
         * (0 = false, 1 = true)
         * @hide
         */
        public static final String DEVELOPMENT_FORCE_RESIZABLE_ACTIVITIES
                = "force_resizable_activities";

        /**
         * Whether to enable experimental freeform support for windows.
         * @hide
         */
        public static final String DEVELOPMENT_ENABLE_FREEFORM_WINDOWS_SUPPORT
                = "enable_freeform_support";

       /**
        * Whether user has enabled development settings.
        */
       public static final String DEVELOPMENT_SETTINGS_ENABLED = "development_settings_enabled";

       /**
        * Whether the device has been provisioned (0 = false, 1 = true).
        * <p>On a multiuser device with a separate system user, the screen may be locked
        * as soon as this is set to true and further activities cannot be launched on the
        * system user unless they are marked to show over keyguard.
        */
       public static final String DEVICE_PROVISIONED = "device_provisioned";

       /**
        * Whether mobile data should be allowed while the device is being provisioned.
        * This allows the provisioning process to turn off mobile data before the user
        * has an opportunity to set things up, preventing other processes from burning
        * precious bytes before wifi is setup.
        * (0 = false, 1 = true)
        * @hide
        */
       public static final String DEVICE_PROVISIONING_MOBILE_DATA_ENABLED =
               "device_provisioning_mobile_data";

       /**
        * The saved value for WindowManagerService.setForcedDisplaySize().
        * Two integers separated by a comma.  If unset, then use the real display size.
        * @hide
        */
       public static final String DISPLAY_SIZE_FORCED = "display_size_forced";

       /**
        * The saved value for WindowManagerService.setForcedDisplayScalingMode().
        * 0 or unset if scaling is automatic, 1 if scaling is disabled.
        * @hide
        */
       public static final String DISPLAY_SCALING_FORCE = "display_scaling_force";

       /**
        * The maximum size, in bytes, of a download that the download manager will transfer over
        * a non-wifi connection.
        * @hide
        */
       public static final String DOWNLOAD_MAX_BYTES_OVER_MOBILE =
               "download_manager_max_bytes_over_mobile";

       /**
        * The recommended maximum size, in bytes, of a download that the download manager should
        * transfer over a non-wifi connection. Over this size, the use will be warned, but will
        * have the option to start the download over the mobile connection anyway.
        * @hide
        */
       public static final String DOWNLOAD_RECOMMENDED_MAX_BYTES_OVER_MOBILE =
               "download_manager_recommended_max_bytes_over_mobile";

       /**
        * @deprecated Use {@link android.provider.Settings.Secure#INSTALL_NON_MARKET_APPS} instead
        */
       @Deprecated
       public static final String INSTALL_NON_MARKET_APPS = Secure.INSTALL_NON_MARKET_APPS;

       /**
        * Whether HDMI control shall be enabled. If disabled, no CEC/MHL command will be
        * sent or processed. (0 = false, 1 = true)
        * @hide
        */
       public static final String HDMI_CONTROL_ENABLED = "hdmi_control_enabled";

       /**
        * Whether HDMI System Audio Control feature is enabled. If enabled, TV will try to turn on
        * system audio mode if there's a connected CEC-enabled AV Receiver. Then audio stream will
        * be played on AVR instead of TV spaeker. If disabled, the system audio mode will never be
        * activated.
        * @hide
        */
        public static final String HDMI_SYSTEM_AUDIO_CONTROL_ENABLED =
                "hdmi_system_audio_control_enabled";

        /**
         * Whether TV will automatically turn on upon reception of the CEC command
         * &lt;Text View On&gt; or &lt;Image View On&gt;. (0 = false, 1 = true)
         *
         * @hide
         */
        public static final String HDMI_CONTROL_AUTO_WAKEUP_ENABLED =
                "hdmi_control_auto_wakeup_enabled";

        /**
         * Whether TV will also turn off other CEC devices when it goes to standby mode.
         * (0 = false, 1 = true)
         *
         * @hide
         */
        public static final String HDMI_CONTROL_AUTO_DEVICE_OFF_ENABLED =
                "hdmi_control_auto_device_off_enabled";

        /**
         * If <b>true</b>, enables out-of-the-box execution for priv apps.
         * Default: false
         * Values: 0 = false, 1 = true
         *
         * @hide
         */
        public static final String PRIV_APP_OOB_ENABLED = "priv_app_oob_enabled";

        /**
         * The interval in milliseconds at which location requests will be throttled when they are
         * coming from the background.
         *
         * @hide
         */
        public static final String LOCATION_BACKGROUND_THROTTLE_INTERVAL_MS =
                "location_background_throttle_interval_ms";

        /**
         * Most frequent location update interval in milliseconds that proximity alert is allowed
         * to request.
         * @hide
         */
        public static final String LOCATION_BACKGROUND_THROTTLE_PROXIMITY_ALERT_INTERVAL_MS =
                "location_background_throttle_proximity_alert_interval_ms";

        /**
         * Packages that are whitelisted for background throttling (throttling will not be applied).
         * @hide
         */
        public static final String LOCATION_BACKGROUND_THROTTLE_PACKAGE_WHITELIST =
            "location_background_throttle_package_whitelist";

        /**
        * Whether TV will switch to MHL port when a mobile device is plugged in.
        * (0 = false, 1 = true)
        * @hide
        */
       public static final String MHL_INPUT_SWITCHING_ENABLED = "mhl_input_switching_enabled";

       /**
        * Whether TV will charge the mobile device connected at MHL port. (0 = false, 1 = true)
        * @hide
        */
       public static final String MHL_POWER_CHARGE_ENABLED = "mhl_power_charge_enabled";

       /**
        * Whether mobile data connections are allowed by the user.  See
        * ConnectivityManager for more info.
        * @hide
        */
       public static final String MOBILE_DATA = "mobile_data";

       /**
        * Whether the mobile data connection should remain active even when higher
        * priority networks like WiFi are active, to help make network switching faster.
        *
        * See ConnectivityService for more info.
        *
        * (0 = disabled, 1 = enabled)
        * @hide
        */
       public static final String MOBILE_DATA_ALWAYS_ON = "mobile_data_always_on";

        /**
         * Size of the event buffer for IP connectivity metrics.
         * @hide
         */
        public static final String CONNECTIVITY_METRICS_BUFFER_SIZE =
              "connectivity_metrics_buffer_size";

       /** {@hide} */
       public static final String NETSTATS_ENABLED = "netstats_enabled";
       /** {@hide} */
       public static final String NETSTATS_POLL_INTERVAL = "netstats_poll_interval";
       /** {@hide} */
       @Deprecated
       public static final String NETSTATS_TIME_CACHE_MAX_AGE = "netstats_time_cache_max_age";
       /** {@hide} */
       public static final String NETSTATS_GLOBAL_ALERT_BYTES = "netstats_global_alert_bytes";
       /** {@hide} */
       public static final String NETSTATS_SAMPLE_ENABLED = "netstats_sample_enabled";
       /** {@hide} */
       public static final String NETSTATS_AUGMENT_ENABLED = "netstats_augment_enabled";

       /** {@hide} */
       public static final String NETSTATS_DEV_BUCKET_DURATION = "netstats_dev_bucket_duration";
       /** {@hide} */
       public static final String NETSTATS_DEV_PERSIST_BYTES = "netstats_dev_persist_bytes";
       /** {@hide} */
       public static final String NETSTATS_DEV_ROTATE_AGE = "netstats_dev_rotate_age";
       /** {@hide} */
       public static final String NETSTATS_DEV_DELETE_AGE = "netstats_dev_delete_age";

       /** {@hide} */
       public static final String NETSTATS_UID_BUCKET_DURATION = "netstats_uid_bucket_duration";
       /** {@hide} */
       public static final String NETSTATS_UID_PERSIST_BYTES = "netstats_uid_persist_bytes";
       /** {@hide} */
       public static final String NETSTATS_UID_ROTATE_AGE = "netstats_uid_rotate_age";
       /** {@hide} */
       public static final String NETSTATS_UID_DELETE_AGE = "netstats_uid_delete_age";

       /** {@hide} */
       public static final String NETSTATS_UID_TAG_BUCKET_DURATION = "netstats_uid_tag_bucket_duration";
       /** {@hide} */
       public static final String NETSTATS_UID_TAG_PERSIST_BYTES = "netstats_uid_tag_persist_bytes";
       /** {@hide} */
       public static final String NETSTATS_UID_TAG_ROTATE_AGE = "netstats_uid_tag_rotate_age";
       /** {@hide} */
       public static final String NETSTATS_UID_TAG_DELETE_AGE = "netstats_uid_tag_delete_age";

       /**
        * User preference for which network(s) should be used. Only the
        * connectivity service should touch this.
        */
       public static final String NETWORK_PREFERENCE = "network_preference";

       /**
        * Which package name to use for network scoring. If null, or if the package is not a valid
        * scorer app, external network scores will neither be requested nor accepted.
        * @hide
        */
       public static final String NETWORK_SCORER_APP = "network_scorer_app";

        /**
         * Whether night display forced auto mode is available.
         * 0 = unavailable, 1 = available.
         * @hide
         */
        public static final String NIGHT_DISPLAY_FORCED_AUTO_MODE_AVAILABLE =
                "night_display_forced_auto_mode_available";

       /**
        * If the NITZ_UPDATE_DIFF time is exceeded then an automatic adjustment
        * to SystemClock will be allowed even if NITZ_UPDATE_SPACING has not been
        * exceeded.
        * @hide
        */
       public static final String NITZ_UPDATE_DIFF = "nitz_update_diff";

       /**
        * The length of time in milli-seconds that automatic small adjustments to
        * SystemClock are ignored if NITZ_UPDATE_DIFF is not exceeded.
        * @hide
        */
       public static final String NITZ_UPDATE_SPACING = "nitz_update_spacing";

       /** Preferred NTP server. {@hide} */
       public static final String NTP_SERVER = "ntp_server";
       /** Timeout in milliseconds to wait for NTP server. {@hide} */
       public static final String NTP_TIMEOUT = "ntp_timeout";

       /** {@hide} */
       public static final String STORAGE_BENCHMARK_INTERVAL = "storage_benchmark_interval";

       /**
        * Sample validity in seconds to configure for the system DNS resolver.
        * {@hide}
        */
       public static final String DNS_RESOLVER_SAMPLE_VALIDITY_SECONDS =
               "dns_resolver_sample_validity_seconds";

       /**
        * Success threshold in percent for use with the system DNS resolver.
        * {@hide}
        */
       public static final String DNS_RESOLVER_SUCCESS_THRESHOLD_PERCENT =
                "dns_resolver_success_threshold_percent";

       /**
        * Minimum number of samples needed for statistics to be considered meaningful in the
        * system DNS resolver.
        * {@hide}
        */
       public static final String DNS_RESOLVER_MIN_SAMPLES = "dns_resolver_min_samples";

       /**
        * Maximum number taken into account for statistics purposes in the system DNS resolver.
        * {@hide}
        */
       public static final String DNS_RESOLVER_MAX_SAMPLES = "dns_resolver_max_samples";

       /**
        * Whether to disable the automatic scheduling of system updates.
        * 1 = system updates won't be automatically scheduled (will always
        * present notification instead).
        * 0 = system updates will be automatically scheduled. (default)
        * @hide
        */
       @SystemApi
       public static final String OTA_DISABLE_AUTOMATIC_UPDATE = "ota_disable_automatic_update";

       /**
        * Whether the package manager should send package verification broadcasts for verifiers to
        * review apps prior to installation.
        * 1 = request apps to be verified prior to installation, if a verifier exists.
        * 0 = do not verify apps before installation
        * @hide
        */
       public static final String PACKAGE_VERIFIER_ENABLE = "package_verifier_enable";

       /** Timeout for package verification.
        * @hide */
       public static final String PACKAGE_VERIFIER_TIMEOUT = "verifier_timeout";

       /** Default response code for package verification.
        * @hide */
       public static final String PACKAGE_VERIFIER_DEFAULT_RESPONSE = "verifier_default_response";

       /**
        * Show package verification setting in the Settings app.
        * 1 = show (default)
        * 0 = hide
        * @hide
        */
       public static final String PACKAGE_VERIFIER_SETTING_VISIBLE = "verifier_setting_visible";

       /**
        * Run package verification on apps installed through ADB/ADT/USB
        * 1 = perform package verification on ADB installs (default)
        * 0 = bypass package verification on ADB installs
        * @hide
        */
       public static final String PACKAGE_VERIFIER_INCLUDE_ADB = "verifier_verify_adb_installs";

       /**
        * Time since last fstrim (milliseconds) after which we force one to happen
        * during device startup.  If unset, the default is 3 days.
        * @hide
        */
       public static final String FSTRIM_MANDATORY_INTERVAL = "fstrim_mandatory_interval";

       /**
        * The interval in milliseconds at which to check packet counts on the
        * mobile data interface when screen is on, to detect possible data
        * connection problems.
        * @hide
        */
       public static final String PDP_WATCHDOG_POLL_INTERVAL_MS =
               "pdp_watchdog_poll_interval_ms";

       /**
        * The interval in milliseconds at which to check packet counts on the
        * mobile data interface when screen is off, to detect possible data
        * connection problems.
        * @hide
        */
       public static final String PDP_WATCHDOG_LONG_POLL_INTERVAL_MS =
               "pdp_watchdog_long_poll_interval_ms";

       /**
        * The interval in milliseconds at which to check packet counts on the
        * mobile data interface after {@link #PDP_WATCHDOG_TRIGGER_PACKET_COUNT}
        * outgoing packets has been reached without incoming packets.
        * @hide
        */
       public static final String PDP_WATCHDOG_ERROR_POLL_INTERVAL_MS =
               "pdp_watchdog_error_poll_interval_ms";

       /**
        * The number of outgoing packets sent without seeing an incoming packet
        * that triggers a countdown (of {@link #PDP_WATCHDOG_ERROR_POLL_COUNT}
        * device is logged to the event log
        * @hide
        */
       public static final String PDP_WATCHDOG_TRIGGER_PACKET_COUNT =
               "pdp_watchdog_trigger_packet_count";

       /**
        * The number of polls to perform (at {@link #PDP_WATCHDOG_ERROR_POLL_INTERVAL_MS})
        * after hitting {@link #PDP_WATCHDOG_TRIGGER_PACKET_COUNT} before
        * attempting data connection recovery.
        * @hide
        */
       public static final String PDP_WATCHDOG_ERROR_POLL_COUNT =
               "pdp_watchdog_error_poll_count";

       /**
        * The number of failed PDP reset attempts before moving to something more
        * drastic: re-registering to the network.
        * @hide
        */
       public static final String PDP_WATCHDOG_MAX_PDP_RESET_FAIL_COUNT =
               "pdp_watchdog_max_pdp_reset_fail_count";

       /**
        * URL to open browser on to allow user to manage a prepay account
        * @hide
        */
       public static final String SETUP_PREPAID_DATA_SERVICE_URL =
               "setup_prepaid_data_service_url";

       /**
        * URL to attempt a GET on to see if this is a prepay device
        * @hide
        */
       public static final String SETUP_PREPAID_DETECTION_TARGET_URL =
               "setup_prepaid_detection_target_url";

       /**
        * Host to check for a redirect to after an attempt to GET
        * SETUP_PREPAID_DETECTION_TARGET_URL. (If we redirected there,
        * this is a prepaid device with zero balance.)
        * @hide
        */
       public static final String SETUP_PREPAID_DETECTION_REDIR_HOST =
               "setup_prepaid_detection_redir_host";

       /**
        * The interval in milliseconds at which to check the number of SMS sent out without asking
        * for use permit, to limit the un-authorized SMS usage.
        *
        * @hide
        */
       public static final String SMS_OUTGOING_CHECK_INTERVAL_MS =
               "sms_outgoing_check_interval_ms";

       /**
        * The number of outgoing SMS sent without asking for user permit (of {@link
        * #SMS_OUTGOING_CHECK_INTERVAL_MS}
        *
        * @hide
        */
       public static final String SMS_OUTGOING_CHECK_MAX_COUNT =
               "sms_outgoing_check_max_count";

       /**
        * Used to disable SMS short code confirmation - defaults to true.
        * True indcates we will do the check, etc.  Set to false to disable.
        * @see com.android.internal.telephony.SmsUsageMonitor
        * @hide
        */
       public static final String SMS_SHORT_CODE_CONFIRMATION = "sms_short_code_confirmation";

        /**
         * Used to select which country we use to determine premium sms codes.
         * One of com.android.internal.telephony.SMSDispatcher.PREMIUM_RULE_USE_SIM,
         * com.android.internal.telephony.SMSDispatcher.PREMIUM_RULE_USE_NETWORK,
         * or com.android.internal.telephony.SMSDispatcher.PREMIUM_RULE_USE_BOTH.
         * @hide
         */
        public static final String SMS_SHORT_CODE_RULE = "sms_short_code_rule";

       /**
        * Used to select TCP's default initial receiver window size in segments - defaults to a build config value
        * @hide
        */
       public static final String TCP_DEFAULT_INIT_RWND = "tcp_default_init_rwnd";

       /**
        * Used to disable Tethering on a device - defaults to true
        * @hide
        */
       public static final String TETHER_SUPPORTED = "tether_supported";

       /**
        * Used to require DUN APN on the device or not - defaults to a build config value
        * which defaults to false
        * @hide
        */
       public static final String TETHER_DUN_REQUIRED = "tether_dun_required";

       /**
        * Used to hold a gservices-provisioned apn value for DUN.  If set, or the
        * corresponding build config values are set it will override the APN DB
        * values.
        * Consists of a comma seperated list of strings:
        * "name,apn,proxy,port,username,password,server,mmsc,mmsproxy,mmsport,mcc,mnc,auth,type"
        * note that empty fields can be ommitted: "name,apn,,,,,,,,,310,260,,DUN"
        * @hide
        */
       public static final String TETHER_DUN_APN = "tether_dun_apn";

        /**
         * Used to disable trying to talk to any available tethering offload HAL.
         *
         * Integer values are interpreted as boolean, and the absence of an explicit setting
         * is interpreted as |false|.
         * @hide
         */
        public static final String TETHER_OFFLOAD_DISABLED = "tether_offload_disabled";

        /**
         * List of certificate (hex string representation of the application's certificate - SHA-1
         * or SHA-256) and carrier app package pairs which are whitelisted to prompt the user for
         * install when a sim card with matching UICC carrier privilege rules is inserted.  The
         * certificate is used as a key, so the certificate encoding here must be the same as the
         * certificate encoding used on the SIM.
         *
         * The value is "cert1:package1;cert2:package2;..."
         * @hide
         */
        @SystemApi
        public static final String CARRIER_APP_WHITELIST = "carrier_app_whitelist";

        /**
         * Map of package name to application names.  Package names must be lower cased as they are
         * used as a key in the map.  The application names cannot and will not be localized.
         *
         * The value is "packageName1:appName1;packageName2:appName2;..."
         * @hide
         */
        @SystemApi
        public static final String CARRIER_APP_NAMES = "carrier_app_names";

       /**
        * USB Mass Storage Enabled
        */
       public static final String USB_MASS_STORAGE_ENABLED = "usb_mass_storage_enabled";

       private static final Validator USB_MASS_STORAGE_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

       /**
        * If this setting is set (to anything), then all references
        * to Gmail on the device must change to Google Mail.
        */
       public static final String USE_GOOGLE_MAIL = "use_google_mail";

        /**
         * Webview Data reduction proxy key.
         * @hide
         */
        public static final String WEBVIEW_DATA_REDUCTION_PROXY_KEY =
                "webview_data_reduction_proxy_key";

       /**
        * Whether or not the WebView fallback mechanism should be enabled.
        * 0=disabled, 1=enabled.
        * @hide
        */
       public static final String WEBVIEW_FALLBACK_LOGIC_ENABLED =
               "webview_fallback_logic_enabled";

       /**
        * Name of the package used as WebView provider (if unset the provider is instead determined
        * by the system).
        * @hide
        */
       public static final String WEBVIEW_PROVIDER = "webview_provider";

       /**
        * Developer setting to enable WebView multiprocess rendering.
        * @hide
        */
       @SystemApi
       public static final String WEBVIEW_MULTIPROCESS = "webview_multiprocess";

       /**
        * The maximum number of notifications shown in 24 hours when switching networks.
        * @hide
        */
       public static final String NETWORK_SWITCH_NOTIFICATION_DAILY_LIMIT =
              "network_switch_notification_daily_limit";

       /**
        * The minimum time in milliseconds between notifications when switching networks.
        * @hide
        */
       public static final String NETWORK_SWITCH_NOTIFICATION_RATE_LIMIT_MILLIS =
              "network_switch_notification_rate_limit_millis";

       /**
        * Whether to automatically switch away from wifi networks that lose Internet access.
        * Only meaningful if config_networkAvoidBadWifi is set to 0, otherwise the system always
        * avoids such networks. Valid values are:
        *
        * 0: Don't avoid bad wifi, don't prompt the user. Get stuck on bad wifi like it's 2013.
        * null: Ask the user whether to switch away from bad wifi.
        * 1: Avoid bad wifi.
        *
        * @hide
        */
       public static final String NETWORK_AVOID_BAD_WIFI = "network_avoid_bad_wifi";

       /**
        * User setting for ConnectivityManager.getMeteredMultipathPreference(). This value may be
        * overridden by the system based on device or application state. If null, the value
        * specified by config_networkMeteredMultipathPreference is used.
        *
        * @hide
        */
       public static final String NETWORK_METERED_MULTIPATH_PREFERENCE =
               "network_metered_multipath_preference";

        /**
         * Default daily multipath budget used by ConnectivityManager.getMultipathPreference()
         * on metered networks. This default quota is only used if quota could not be determined
         * from data plan or data limit/warning set by the user.
         * @hide
         */
        public static final String NETWORK_DEFAULT_DAILY_MULTIPATH_QUOTA_BYTES =
                "network_default_daily_multipath_quota_bytes";

        /**
         * Network watchlist last report time.
         * @hide
         */
        public static final String NETWORK_WATCHLIST_LAST_REPORT_TIME =
                "network_watchlist_last_report_time";

       /**
        * The thresholds of the wifi throughput badging (SD, HD etc.) as a comma-delimited list of
        * colon-delimited key-value pairs. The key is the badging enum value defined in
        * android.net.ScoredNetwork and the value is the minimum sustained network throughput in
        * kbps required for the badge. For example: "10:3000,20:5000,30:25000"
        *
        * @hide
        */
       @SystemApi
       public static final String WIFI_BADGING_THRESHOLDS = "wifi_badging_thresholds";

       /**
        * Whether Wifi display is enabled/disabled
        * 0=disabled. 1=enabled.
        * @hide
        */
       public static final String WIFI_DISPLAY_ON = "wifi_display_on";

       /**
        * Whether Wifi display certification mode is enabled/disabled
        * 0=disabled. 1=enabled.
        * @hide
        */
       public static final String WIFI_DISPLAY_CERTIFICATION_ON =
               "wifi_display_certification_on";

       /**
        * WPS Configuration method used by Wifi display, this setting only
        * takes effect when WIFI_DISPLAY_CERTIFICATION_ON is 1 (enabled).
        *
        * Possible values are:
        *
        * WpsInfo.INVALID: use default WPS method chosen by framework
        * WpsInfo.PBC    : use Push button
        * WpsInfo.KEYPAD : use Keypad
        * WpsInfo.DISPLAY: use Display
        * @hide
        */
       public static final String WIFI_DISPLAY_WPS_CONFIG =
           "wifi_display_wps_config";

       /**
        * Whether to notify the user of open networks.
        * <p>
        * If not connected and the scan results have an open network, we will
        * put this notification up. If we attempt to connect to a network or
        * the open network(s) disappear, we remove the notification. When we
        * show the notification, we will not show it again for
        * {@link android.provider.Settings.Secure#WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY} time.
        *
        * @deprecated This feature is no longer controlled by this setting in
        * {@link android.os.Build.VERSION_CODES#O}.
        */
       @Deprecated
       public static final String WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON =
               "wifi_networks_available_notification_on";

       private static final Validator WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON_VALIDATOR =
               BOOLEAN_VALIDATOR;

       /**
        * Whether to notify the user of carrier networks.
        * <p>
        * If not connected and the scan results have a carrier network, we will
        * put this notification up. If we attempt to connect to a network or
        * the carrier network(s) disappear, we remove the notification. When we
        * show the notification, we will not show it again for
        * {@link android.provider.Settings.Global#WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY} time.
        * @hide
        */
       public static final String WIFI_CARRIER_NETWORKS_AVAILABLE_NOTIFICATION_ON =
               "wifi_carrier_networks_available_notification_on";

       private static final Validator WIFI_CARRIER_NETWORKS_AVAILABLE_NOTIFICATION_ON_VALIDATOR =
               BOOLEAN_VALIDATOR;

       /**
        * {@hide}
        */
       public static final String WIMAX_NETWORKS_AVAILABLE_NOTIFICATION_ON =
               "wimax_networks_available_notification_on";

       /**
        * Delay (in seconds) before repeating the Wi-Fi networks available notification.
        * Connecting to a network will reset the timer.
        */
       public static final String WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY =
               "wifi_networks_available_repeat_delay";

       private static final Validator WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY_VALIDATOR =
               NON_NEGATIVE_INTEGER_VALIDATOR;

       /**
        * 802.11 country code in ISO 3166 format
        * @hide
        */
       public static final String WIFI_COUNTRY_CODE = "wifi_country_code";

       /**
        * The interval in milliseconds to issue wake up scans when wifi needs
        * to connect. This is necessary to connect to an access point when
        * device is on the move and the screen is off.
        * @hide
        */
       public static final String WIFI_FRAMEWORK_SCAN_INTERVAL_MS =
               "wifi_framework_scan_interval_ms";

       /**
        * The interval in milliseconds after which Wi-Fi is considered idle.
        * When idle, it is possible for the device to be switched from Wi-Fi to
        * the mobile data network.
        * @hide
        */
       public static final String WIFI_IDLE_MS = "wifi_idle_ms";

       /**
        * When the number of open networks exceeds this number, the
        * least-recently-used excess networks will be removed.
        */
       public static final String WIFI_NUM_OPEN_NETWORKS_KEPT = "wifi_num_open_networks_kept";

       private static final Validator WIFI_NUM_OPEN_NETWORKS_KEPT_VALIDATOR =
               NON_NEGATIVE_INTEGER_VALIDATOR;

       /**
        * Whether the Wi-Fi should be on.  Only the Wi-Fi service should touch this.
        */
       public static final String WIFI_ON = "wifi_on";

       /**
        * Setting to allow scans to be enabled even wifi is turned off for connectivity.
        * @hide
        */
       public static final String WIFI_SCAN_ALWAYS_AVAILABLE =
                "wifi_scan_always_enabled";

        /**
         * Whether soft AP will shut down after a timeout period when no devices are connected.
         *
         * Type: int (0 for false, 1 for true)
         * @hide
         */
        public static final String SOFT_AP_TIMEOUT_ENABLED = "soft_ap_timeout_enabled";

        private static final Validator SOFT_AP_TIMEOUT_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Value to specify if Wi-Fi Wakeup feature is enabled.
         *
         * Type: int (0 for false, 1 for true)
         * @hide
         */
        @SystemApi
        public static final String WIFI_WAKEUP_ENABLED = "wifi_wakeup_enabled";

        private static final Validator WIFI_WAKEUP_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * Value to specify whether network quality scores and badging should be shown in the UI.
         *
         * Type: int (0 for false, 1 for true)
         * @hide
         */
        public static final String NETWORK_SCORING_UI_ENABLED = "network_scoring_ui_enabled";

        /**
         * Value to specify how long in milliseconds to retain seen score cache curves to be used
         * when generating SSID only bases score curves.
         *
         * Type: long
         * @hide
         */
        public static final String SPEED_LABEL_CACHE_EVICTION_AGE_MILLIS =
                "speed_label_cache_eviction_age_millis";

        /**
         * Value to specify if network recommendations from
         * {@link com.android.server.NetworkScoreService} are enabled.
         *
         * Type: int
         * Valid values:
         *   -1 = Forced off
         *    0 = Disabled
         *    1 = Enabled
         *
         * Most readers of this setting should simply check if value == 1 to determined the
         * enabled state.
         * @hide
         */
        public static final String NETWORK_RECOMMENDATIONS_ENABLED =
                "network_recommendations_enabled";

        private static final Validator NETWORK_RECOMMENDATIONS_ENABLED_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[] {"-1", "0", "1"});

        /**
         * Which package name to use for network recommendations. If null, network recommendations
         * will neither be requested nor accepted.
         *
         * Use {@link NetworkScoreManager#getActiveScorerPackage()} to read this value and
         * {@link NetworkScoreManager#setActiveScorer(String)} to write it.
         *
         * Type: string - package name
         * @hide
         */
        public static final String NETWORK_RECOMMENDATIONS_PACKAGE =
                "network_recommendations_package";

        /**
         * The package name of the application that connect and secures high quality open wifi
         * networks automatically.
         *
         * Type: string package name or null if the feature is either not provided or disabled.
         * @hide
         */
        @TestApi
        public static final String USE_OPEN_WIFI_PACKAGE = "use_open_wifi_package";

        private static final Validator USE_OPEN_WIFI_PACKAGE_VALIDATOR = new Validator() {
            @Override
            public boolean validate(String value) {
                return (value == null) || PACKAGE_NAME_VALIDATOR.validate(value);
            }
        };

        /**
         * The number of milliseconds the {@link com.android.server.NetworkScoreService}
         * will give a recommendation request to complete before returning a default response.
         *
         * Type: long
         * @hide
         * @deprecated to be removed
         */
        public static final String NETWORK_RECOMMENDATION_REQUEST_TIMEOUT_MS =
                "network_recommendation_request_timeout_ms";

        /**
         * The expiration time in milliseconds for the {@link android.net.WifiKey} request cache in
         * {@link com.android.server.wifi.RecommendedNetworkEvaluator}.
         *
         * Type: long
         * @hide
         */
        public static final String RECOMMENDED_NETWORK_EVALUATOR_CACHE_EXPIRY_MS =
                "recommended_network_evaluator_cache_expiry_ms";

        /**
        * Settings to allow BLE scans to be enabled even when Bluetooth is turned off for
        * connectivity.
        * @hide
        */
        public static final String BLE_SCAN_ALWAYS_AVAILABLE = "ble_scan_always_enabled";

        /**
         * The length in milliseconds of a BLE scan window in a low-power scan mode.
         * @hide
         */
        public static final String BLE_SCAN_LOW_POWER_WINDOW_MS = "ble_scan_low_power_window_ms";

        /**
         * The length in milliseconds of a BLE scan window in a balanced scan mode.
         * @hide
         */
        public static final String BLE_SCAN_BALANCED_WINDOW_MS = "ble_scan_balanced_window_ms";

        /**
         * The length in milliseconds of a BLE scan window in a low-latency scan mode.
         * @hide
         */
        public static final String BLE_SCAN_LOW_LATENCY_WINDOW_MS =
                "ble_scan_low_latency_window_ms";

        /**
         * The length in milliseconds of a BLE scan interval in a low-power scan mode.
         * @hide
         */
        public static final String BLE_SCAN_LOW_POWER_INTERVAL_MS =
                "ble_scan_low_power_interval_ms";

        /**
         * The length in milliseconds of a BLE scan interval in a balanced scan mode.
         * @hide
         */
        public static final String BLE_SCAN_BALANCED_INTERVAL_MS =
                "ble_scan_balanced_interval_ms";

        /**
         * The length in milliseconds of a BLE scan interval in a low-latency scan mode.
         * @hide
         */
        public static final String BLE_SCAN_LOW_LATENCY_INTERVAL_MS =
                "ble_scan_low_latency_interval_ms";

        /**
         * The mode that BLE scanning clients will be moved to when in the background.
         * @hide
         */
        public static final String BLE_SCAN_BACKGROUND_MODE = "ble_scan_background_mode";

       /**
        * Used to save the Wifi_ON state prior to tethering.
        * This state will be checked to restore Wifi after
        * the user turns off tethering.
        *
        * @hide
        */
       public static final String WIFI_SAVED_STATE = "wifi_saved_state";

       /**
        * The interval in milliseconds to scan as used by the wifi supplicant
        * @hide
        */
       public static final String WIFI_SUPPLICANT_SCAN_INTERVAL_MS =
               "wifi_supplicant_scan_interval_ms";

        /**
         * whether frameworks handles wifi auto-join
         * @hide
         */
       public static final String WIFI_ENHANCED_AUTO_JOIN =
                "wifi_enhanced_auto_join";

        /**
         * whether settings show RSSI
         * @hide
         */
        public static final String WIFI_NETWORK_SHOW_RSSI =
                "wifi_network_show_rssi";

        /**
        * The interval in milliseconds to scan at supplicant when p2p is connected
        * @hide
        */
       public static final String WIFI_SCAN_INTERVAL_WHEN_P2P_CONNECTED_MS =
               "wifi_scan_interval_p2p_connected_ms";

       /**
        * Whether the Wi-Fi watchdog is enabled.
        */
       public static final String WIFI_WATCHDOG_ON = "wifi_watchdog_on";

       /**
        * Setting to turn off poor network avoidance on Wi-Fi. Feature is enabled by default and
        * the setting needs to be set to 0 to disable it.
        * @hide
        */
       public static final String WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED =
               "wifi_watchdog_poor_network_test_enabled";

       private static final Validator WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED_VALIDATOR =
               ANY_STRING_VALIDATOR;

       /**
        * Setting to turn on suspend optimizations at screen off on Wi-Fi. Enabled by default and
        * needs to be set to 0 to disable it.
        * @hide
        */
       public static final String WIFI_SUSPEND_OPTIMIZATIONS_ENABLED =
               "wifi_suspend_optimizations_enabled";

       /**
        * Setting to enable verbose logging in Wi-Fi; disabled by default, and setting to 1
        * will enable it. In the future, additional values may be supported.
        * @hide
        */
       public static final String WIFI_VERBOSE_LOGGING_ENABLED =
               "wifi_verbose_logging_enabled";

        /**
         * Setting to enable connected MAC randomization in Wi-Fi; disabled by default, and
         * setting to 1 will enable it. In the future, additional values may be supported.
         * @hide
         */
        public static final String WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED =
                "wifi_connected_mac_randomization_enabled";

        /**
         * Parameters to adjust the performance of framework wifi scoring methods.
         * <p>
         * Encoded as a comma-separated key=value list, for example:
         *   "rssi5=-80:-77:-70:-57,rssi2=-83:-80:-73:-60,horizon=15"
         * This is intended for experimenting with new parameter values,
         * and is normally unset or empty. The example does not include all
         * parameters that may be honored.
         * Default values are provided by code or device configurations.
         * Errors in the parameters will cause the entire setting to be ignored.
         * @hide
         */
        public static final String WIFI_SCORE_PARAMS =
                "wifi_score_params";

       /**
        * The maximum number of times we will retry a connection to an access
        * point for which we have failed in acquiring an IP address from DHCP.
        * A value of N means that we will make N+1 connection attempts in all.
        */
       public static final String WIFI_MAX_DHCP_RETRY_COUNT = "wifi_max_dhcp_retry_count";

       /**
        * Maximum amount of time in milliseconds to hold a wakelock while waiting for mobile
        * data connectivity to be established after a disconnect from Wi-Fi.
        */
       public static final String WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS =
           "wifi_mobile_data_transition_wakelock_timeout_ms";

       /**
        * This setting controls whether WiFi configurations created by a Device Owner app
        * should be locked down (that is, be editable or removable only by the Device Owner App,
        * not even by Settings app).
        * This setting takes integer values. Non-zero values mean DO created configurations
        * are locked down. Value of zero means they are not. Default value in the absence of
        * actual value to this setting is 0.
        */
       public static final String WIFI_DEVICE_OWNER_CONFIGS_LOCKDOWN =
               "wifi_device_owner_configs_lockdown";

       /**
        * The operational wifi frequency band
        * Set to one of {@link WifiManager#WIFI_FREQUENCY_BAND_AUTO},
        * {@link WifiManager#WIFI_FREQUENCY_BAND_5GHZ} or
        * {@link WifiManager#WIFI_FREQUENCY_BAND_2GHZ}
        *
        * @hide
        */
       public static final String WIFI_FREQUENCY_BAND = "wifi_frequency_band";

       /**
        * The Wi-Fi peer-to-peer device name
        * @hide
        */
       public static final String WIFI_P2P_DEVICE_NAME = "wifi_p2p_device_name";

       /**
        * The min time between wifi disable and wifi enable
        * @hide
        */
       public static final String WIFI_REENABLE_DELAY_MS = "wifi_reenable_delay";

       /**
        * Timeout for ephemeral networks when all known BSSIDs go out of range. We will disconnect
        * from an ephemeral network if there is no BSSID for that network with a non-null score that
        * has been seen in this time period.
        *
        * If this is less than or equal to zero, we use a more conservative behavior and only check
        * for a non-null score from the currently connected or target BSSID.
        * @hide
        */
       public static final String WIFI_EPHEMERAL_OUT_OF_RANGE_TIMEOUT_MS =
               "wifi_ephemeral_out_of_range_timeout_ms";

       /**
        * The number of milliseconds to delay when checking for data stalls during
        * non-aggressive detection. (screen is turned off.)
        * @hide
        */
       public static final String DATA_STALL_ALARM_NON_AGGRESSIVE_DELAY_IN_MS =
               "data_stall_alarm_non_aggressive_delay_in_ms";

       /**
        * The number of milliseconds to delay when checking for data stalls during
        * aggressive detection. (screen on or suspected data stall)
        * @hide
        */
       public static final String DATA_STALL_ALARM_AGGRESSIVE_DELAY_IN_MS =
               "data_stall_alarm_aggressive_delay_in_ms";

       /**
        * The number of milliseconds to allow the provisioning apn to remain active
        * @hide
        */
       public static final String PROVISIONING_APN_ALARM_DELAY_IN_MS =
               "provisioning_apn_alarm_delay_in_ms";

       /**
        * The interval in milliseconds at which to check gprs registration
        * after the first registration mismatch of gprs and voice service,
        * to detect possible data network registration problems.
        *
        * @hide
        */
       public static final String GPRS_REGISTER_CHECK_PERIOD_MS =
               "gprs_register_check_period_ms";

       /**
        * Nonzero causes Log.wtf() to crash.
        * @hide
        */
       public static final String WTF_IS_FATAL = "wtf_is_fatal";

       /**
        * Ringer mode. This is used internally, changing this value will not
        * change the ringer mode. See AudioManager.
        */
       public static final String MODE_RINGER = "mode_ringer";

       /**
        * Overlay display devices setting.
        * The associated value is a specially formatted string that describes the
        * size and density of simulated secondary display devices.
        * <p>
        * Format: {width}x{height}/{dpi};...
        * </p><p>
        * Example:
        * <ul>
        * <li><code>1280x720/213</code>: make one overlay that is 1280x720 at 213dpi.</li>
        * <li><code>1920x1080/320;1280x720/213</code>: make two overlays, the first
        * at 1080p and the second at 720p.</li>
        * <li>If the value is empty, then no overlay display devices are created.</li>
        * </ul></p>
        *
        * @hide
        */
       public static final String OVERLAY_DISPLAY_DEVICES = "overlay_display_devices";

        /**
         * Threshold values for the duration and level of a discharge cycle,
         * under which we log discharge cycle info.
         *
         * @hide
         */
        public static final String
                BATTERY_DISCHARGE_DURATION_THRESHOLD = "battery_discharge_duration_threshold";

        /** @hide */
        public static final String BATTERY_DISCHARGE_THRESHOLD = "battery_discharge_threshold";

        /**
         * Flag for allowing ActivityManagerService to send ACTION_APP_ERROR
         * intents on application crashes and ANRs. If this is disabled, the
         * crash/ANR dialog will never display the "Report" button.
         * <p>
         * Type: int (0 = disallow, 1 = allow)
         *
         * @hide
         */
        public static final String SEND_ACTION_APP_ERROR = "send_action_app_error";

        /**
         * Maximum age of entries kept by {@link DropBoxManager}.
         *
         * @hide
         */
        public static final String DROPBOX_AGE_SECONDS = "dropbox_age_seconds";

        /**
         * Maximum number of entry files which {@link DropBoxManager} will keep
         * around.
         *
         * @hide
         */
        public static final String DROPBOX_MAX_FILES = "dropbox_max_files";

        /**
         * Maximum amount of disk space used by {@link DropBoxManager} no matter
         * what.
         *
         * @hide
         */
        public static final String DROPBOX_QUOTA_KB = "dropbox_quota_kb";

        /**
         * Percent of free disk (excluding reserve) which {@link DropBoxManager}
         * will use.
         *
         * @hide
         */
        public static final String DROPBOX_QUOTA_PERCENT = "dropbox_quota_percent";

        /**
         * Percent of total disk which {@link DropBoxManager} will never dip
         * into.
         *
         * @hide
         */
        public static final String DROPBOX_RESERVE_PERCENT = "dropbox_reserve_percent";

        /**
         * Prefix for per-tag dropbox disable/enable settings.
         *
         * @hide
         */
        public static final String DROPBOX_TAG_PREFIX = "dropbox:";

        /**
         * Lines of logcat to include with system crash/ANR/etc. reports, as a
         * prefix of the dropbox tag of the report type. For example,
         * "logcat_for_system_server_anr" controls the lines of logcat captured
         * with system server ANR reports. 0 to disable.
         *
         * @hide
         */
        public static final String ERROR_LOGCAT_PREFIX = "logcat_for_";

        /**
         * The interval in minutes after which the amount of free storage left
         * on the device is logged to the event log
         *
         * @hide
         */
        public static final String SYS_FREE_STORAGE_LOG_INTERVAL = "sys_free_storage_log_interval";

        /**
         * Threshold for the amount of change in disk free space required to
         * report the amount of free space. Used to prevent spamming the logs
         * when the disk free space isn't changing frequently.
         *
         * @hide
         */
        public static final String
                DISK_FREE_CHANGE_REPORTING_THRESHOLD = "disk_free_change_reporting_threshold";

        /**
         * Minimum percentage of free storage on the device that is used to
         * determine if the device is running low on storage. The default is 10.
         * <p>
         * Say this value is set to 10, the device is considered running low on
         * storage if 90% or more of the device storage is filled up.
         *
         * @hide
         */
        public static final String
                SYS_STORAGE_THRESHOLD_PERCENTAGE = "sys_storage_threshold_percentage";

        /**
         * Maximum byte size of the low storage threshold. This is to ensure
         * that {@link #SYS_STORAGE_THRESHOLD_PERCENTAGE} does not result in an
         * overly large threshold for large storage devices. Currently this must
         * be less than 2GB. This default is 500MB.
         *
         * @hide
         */
        public static final String
                SYS_STORAGE_THRESHOLD_MAX_BYTES = "sys_storage_threshold_max_bytes";

        /**
         * Minimum bytes of free storage on the device before the data partition
         * is considered full. By default, 1 MB is reserved to avoid system-wide
         * SQLite disk full exceptions.
         *
         * @hide
         */
        public static final String
                SYS_STORAGE_FULL_THRESHOLD_BYTES = "sys_storage_full_threshold_bytes";

        /**
         * Minimum percentage of storage on the device that is reserved for
         * cached data.
         *
         * @hide
         */
        public static final String
                SYS_STORAGE_CACHE_PERCENTAGE = "sys_storage_cache_percentage";

        /**
         * Maximum bytes of storage on the device that is reserved for cached
         * data.
         *
         * @hide
         */
        public static final String
                SYS_STORAGE_CACHE_MAX_BYTES = "sys_storage_cache_max_bytes";

        /**
         * The maximum reconnect delay for short network outages or when the
         * network is suspended due to phone use.
         *
         * @hide
         */
        public static final String
                SYNC_MAX_RETRY_DELAY_IN_SECONDS = "sync_max_retry_delay_in_seconds";

        /**
         * The number of milliseconds to delay before sending out
         * {@link ConnectivityManager#CONNECTIVITY_ACTION} broadcasts. Ignored.
         *
         * @hide
         */
        public static final String CONNECTIVITY_CHANGE_DELAY = "connectivity_change_delay";


        /**
         * Network sampling interval, in seconds. We'll generate link information
         * about bytes/packets sent and error rates based on data sampled in this interval
         *
         * @hide
         */

        public static final String CONNECTIVITY_SAMPLING_INTERVAL_IN_SECONDS =
                "connectivity_sampling_interval_in_seconds";

        /**
         * The series of successively longer delays used in retrying to download PAC file.
         * Last delay is used between successful PAC downloads.
         *
         * @hide
         */
        public static final String PAC_CHANGE_DELAY = "pac_change_delay";

        /**
         * Don't attempt to detect captive portals.
         *
         * @hide
         */
        public static final int CAPTIVE_PORTAL_MODE_IGNORE = 0;

        /**
         * When detecting a captive portal, display a notification that
         * prompts the user to sign in.
         *
         * @hide
         */
        public static final int CAPTIVE_PORTAL_MODE_PROMPT = 1;

        /**
         * When detecting a captive portal, immediately disconnect from the
         * network and do not reconnect to that network in the future.
         *
         * @hide
         */
        public static final int CAPTIVE_PORTAL_MODE_AVOID = 2;

        /**
         * What to do when connecting a network that presents a captive portal.
         * Must be one of the CAPTIVE_PORTAL_MODE_* constants above.
         *
         * The default for this setting is CAPTIVE_PORTAL_MODE_PROMPT.
         * @hide
         */
        public static final String CAPTIVE_PORTAL_MODE = "captive_portal_mode";

        /**
         * Setting to turn off captive portal detection. Feature is enabled by
         * default and the setting needs to be set to 0 to disable it.
         *
         * @deprecated use CAPTIVE_PORTAL_MODE_IGNORE to disable captive portal detection
         * @hide
         */
        @Deprecated
        public static final String
                CAPTIVE_PORTAL_DETECTION_ENABLED = "captive_portal_detection_enabled";

        /**
         * The server used for captive portal detection upon a new conection. A
         * 204 response code from the server is used for validation.
         * TODO: remove this deprecated symbol.
         *
         * @hide
         */
        public static final String CAPTIVE_PORTAL_SERVER = "captive_portal_server";

        /**
         * The URL used for HTTPS captive portal detection upon a new connection.
         * A 204 response code from the server is used for validation.
         *
         * @hide
         */
        public static final String CAPTIVE_PORTAL_HTTPS_URL = "captive_portal_https_url";

        /**
         * The URL used for HTTP captive portal detection upon a new connection.
         * A 204 response code from the server is used for validation.
         *
         * @hide
         */
        public static final String CAPTIVE_PORTAL_HTTP_URL = "captive_portal_http_url";

        /**
         * The URL used for fallback HTTP captive portal detection when previous HTTP
         * and HTTPS captive portal detection attemps did not return a conclusive answer.
         *
         * @hide
         */
        public static final String CAPTIVE_PORTAL_FALLBACK_URL = "captive_portal_fallback_url";

        /**
         * A comma separated list of URLs used for captive portal detection in addition to the
         * fallback HTTP url associated with the CAPTIVE_PORTAL_FALLBACK_URL settings.
         *
         * @hide
         */
        public static final String CAPTIVE_PORTAL_OTHER_FALLBACK_URLS =
                "captive_portal_other_fallback_urls";

        /**
         * Whether to use HTTPS for network validation. This is enabled by default and the setting
         * needs to be set to 0 to disable it. This setting is a misnomer because captive portals
         * don't actually use HTTPS, but it's consistent with the other settings.
         *
         * @hide
         */
        public static final String CAPTIVE_PORTAL_USE_HTTPS = "captive_portal_use_https";

        /**
         * Which User-Agent string to use in the header of the captive portal detection probes.
         * The User-Agent field is unset when this setting has no value (HttpUrlConnection default).
         *
         * @hide
         */
        public static final String CAPTIVE_PORTAL_USER_AGENT = "captive_portal_user_agent";

        /**
         * Whether network service discovery is enabled.
         *
         * @hide
         */
        public static final String NSD_ON = "nsd_on";

        /**
         * Let user pick default install location.
         *
         * @hide
         */
        public static final String SET_INSTALL_LOCATION = "set_install_location";

        /**
         * Default install location value.
         * 0 = auto, let system decide
         * 1 = internal
         * 2 = sdcard
         * @hide
         */
        public static final String DEFAULT_INSTALL_LOCATION = "default_install_location";

        /**
         * ms during which to consume extra events related to Inet connection
         * condition after a transtion to fully-connected
         *
         * @hide
         */
        public static final String
                INET_CONDITION_DEBOUNCE_UP_DELAY = "inet_condition_debounce_up_delay";

        /**
         * ms during which to consume extra events related to Inet connection
         * condtion after a transtion to partly-connected
         *
         * @hide
         */
        public static final String
                INET_CONDITION_DEBOUNCE_DOWN_DELAY = "inet_condition_debounce_down_delay";

        /** {@hide} */
        public static final String
                READ_EXTERNAL_STORAGE_ENFORCED_DEFAULT = "read_external_storage_enforced_default";

        /**
         * Host name and port for global http proxy. Uses ':' seperator for
         * between host and port.
         */
        public static final String HTTP_PROXY = "http_proxy";

        /**
         * Host name for global http proxy. Set via ConnectivityManager.
         *
         * @hide
         */
        public static final String GLOBAL_HTTP_PROXY_HOST = "global_http_proxy_host";

        /**
         * Integer host port for global http proxy. Set via ConnectivityManager.
         *
         * @hide
         */
        public static final String GLOBAL_HTTP_PROXY_PORT = "global_http_proxy_port";

        /**
         * Exclusion list for global proxy. This string contains a list of
         * comma-separated domains where the global proxy does not apply.
         * Domains should be listed in a comma- separated list. Example of
         * acceptable formats: ".domain1.com,my.domain2.com" Use
         * ConnectivityManager to set/get.
         *
         * @hide
         */
        public static final String
                GLOBAL_HTTP_PROXY_EXCLUSION_LIST = "global_http_proxy_exclusion_list";

        /**
         * The location PAC File for the proxy.
         * @hide
         */
        public static final String
                GLOBAL_HTTP_PROXY_PAC = "global_proxy_pac_url";

        /**
         * Enables the UI setting to allow the user to specify the global HTTP
         * proxy and associated exclusion list.
         *
         * @hide
         */
        public static final String SET_GLOBAL_HTTP_PROXY = "set_global_http_proxy";

        /**
         * Setting for default DNS in case nobody suggests one
         *
         * @hide
         */
        public static final String DEFAULT_DNS_SERVER = "default_dns_server";

        /**
         * The requested Private DNS mode (string), and an accompanying specifier (string).
         *
         * Currently, the specifier holds the chosen provider name when the mode requests
         * a specific provider. It may be used to store the provider name even when the
         * mode changes so that temporarily disabling and re-enabling the specific
         * provider mode does not necessitate retyping the provider hostname.
         *
         * @hide
         */
        public static final String PRIVATE_DNS_MODE = "private_dns_mode";

        private static final Validator PRIVATE_DNS_MODE_VALIDATOR = ANY_STRING_VALIDATOR;

        /**
         * @hide
         */
        public static final String PRIVATE_DNS_SPECIFIER = "private_dns_specifier";

        private static final Validator PRIVATE_DNS_SPECIFIER_VALIDATOR = ANY_STRING_VALIDATOR;

        /** {@hide} */
        public static final String
                BLUETOOTH_HEADSET_PRIORITY_PREFIX = "bluetooth_headset_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_A2DP_SINK_PRIORITY_PREFIX = "bluetooth_a2dp_sink_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_A2DP_SRC_PRIORITY_PREFIX = "bluetooth_a2dp_src_priority_";
        /** {@hide} */
        public static final String BLUETOOTH_A2DP_SUPPORTS_OPTIONAL_CODECS_PREFIX =
                "bluetooth_a2dp_supports_optional_codecs_";
        /** {@hide} */
        public static final String BLUETOOTH_A2DP_OPTIONAL_CODECS_ENABLED_PREFIX =
                "bluetooth_a2dp_optional_codecs_enabled_";
        /** {@hide} */
        public static final String
                BLUETOOTH_INPUT_DEVICE_PRIORITY_PREFIX = "bluetooth_input_device_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_MAP_PRIORITY_PREFIX = "bluetooth_map_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_MAP_CLIENT_PRIORITY_PREFIX = "bluetooth_map_client_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_PBAP_CLIENT_PRIORITY_PREFIX = "bluetooth_pbap_client_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_SAP_PRIORITY_PREFIX = "bluetooth_sap_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_PAN_PRIORITY_PREFIX = "bluetooth_pan_priority_";
        /** {@hide} */
        public static final String
                BLUETOOTH_HEARING_AID_PRIORITY_PREFIX = "bluetooth_hearing_aid_priority_";

        /**
         * Activity manager specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "gc_timeout=5000,max_cached_processes=24"
         *
         * The following keys are supported:
         *
         * <pre>
         * max_cached_processes                 (int)
         * background_settle_time               (long)
         * fgservice_min_shown_time             (long)
         * fgservice_min_report_time            (long)
         * fgservice_screen_on_before_time      (long)
         * fgservice_screen_on_after_time       (long)
         * content_provider_retain_time         (long)
         * gc_timeout                           (long)
         * gc_min_interval                      (long)
         * full_pss_min_interval                (long)
         * full_pss_lowered_interval            (long)
         * power_check_interval                 (long)
         * power_check_max_cpu_1                (int)
         * power_check_max_cpu_2                (int)
         * power_check_max_cpu_3                (int)
         * power_check_max_cpu_4                (int)
         * service_usage_interaction_time       (long)
         * usage_stats_interaction_interval     (long)
         * service_restart_duration             (long)
         * service_reset_run_duration           (long)
         * service_restart_duration_factor      (int)
         * service_min_restart_time_between     (long)
         * service_max_inactivity               (long)
         * service_bg_start_timeout             (long)
         * process_start_async                  (boolean)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.am.ActivityManagerConstants
         */
        public static final String ACTIVITY_MANAGER_CONSTANTS = "activity_manager_constants";

        /**
         * Device Idle (Doze) specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "inactive_to=60000,sensing_to=400000"
         *
         * The following keys are supported:
         *
         * <pre>
         * inactive_to                      (long)
         * sensing_to                       (long)
         * motion_inactive_to               (long)
         * idle_after_inactive_to           (long)
         * idle_pending_to                  (long)
         * max_idle_pending_to              (long)
         * idle_pending_factor              (float)
         * idle_to                          (long)
         * max_idle_to                      (long)
         * idle_factor                      (float)
         * min_time_to_alarm                (long)
         * max_temp_app_whitelist_duration  (long)
         * notification_whitelist_duration  (long)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.DeviceIdleController.Constants
         */
        public static final String DEVICE_IDLE_CONSTANTS = "device_idle_constants";

        /**
         * Battery Saver specific settings
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "vibration_disabled=true,adjust_brightness_factor=0.5"
         *
         * The following keys are supported:
         *
         * <pre>
         * vibration_disabled                (boolean)
         * animation_disabled                (boolean)
         * soundtrigger_disabled             (boolean)
         * fullbackup_deferred               (boolean)
         * keyvaluebackup_deferred           (boolean)
         * firewall_disabled                 (boolean)
         * gps_mode                          (int)
         * adjust_brightness_disabled        (boolean)
         * adjust_brightness_factor          (float)
         * </pre>
         * @hide
         * @see com.android.server.power.BatterySaverPolicy
         */
        public static final String BATTERY_SAVER_CONSTANTS = "battery_saver_constants";

        /**
         * Battery Saver device specific settings
         * This is encoded as a key=value list, separated by commas.
         * See {@link com.android.server.power.BatterySaverPolicy} for the details.
         *
         * @hide
         */
        public static final String BATTERY_SAVER_DEVICE_SPECIFIC_CONSTANTS =
                "battery_saver_device_specific_constants";

        /**
         * Battery tip specific settings
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "battery_tip_enabled=true,summary_enabled=true,high_usage_enabled=true,"
         * "high_usage_app_count=3,reduced_battery_enabled=false,reduced_battery_percent=50,"
         * "high_usage_battery_draining=25,high_usage_period_ms=3000"
         *
         * The following keys are supported:
         *
         * <pre>
         * battery_tip_enabled              (boolean)
         * summary_enabled                  (boolean)
         * battery_saver_tip_enabled        (boolean)
         * high_usage_enabled               (boolean)
         * high_usage_app_count             (int)
         * high_usage_period_ms             (long)
         * high_usage_battery_draining      (int)
         * app_restriction_enabled          (boolean)
         * reduced_battery_enabled          (boolean)
         * reduced_battery_percent          (int)
         * low_battery_enabled              (boolean)
         * low_battery_hour                 (int)
         * </pre>
         * @hide
         */
        public static final String BATTERY_TIP_CONSTANTS = "battery_tip_constants";

        /**
         * Battery anomaly detection specific settings
         * This is encoded as a key=value list, separated by commas.
         * wakeup_blacklisted_tags is a string, encoded as a set of tags, encoded via
         * {@link Uri#encode(String)}, separated by colons. Ex:
         *
         * "anomaly_detection_enabled=true,wakelock_threshold=2000,wakeup_alarm_enabled=true,"
         * "wakeup_alarm_threshold=10,wakeup_blacklisted_tags=tag1:tag2:with%2Ccomma:with%3Acolon"
         *
         * The following keys are supported:
         *
         * <pre>
         * anomaly_detection_enabled       (boolean)
         * wakelock_enabled                (boolean)
         * wakelock_threshold              (long)
         * wakeup_alarm_enabled            (boolean)
         * wakeup_alarm_threshold          (long)
         * wakeup_blacklisted_tags         (string)
         * bluetooth_scan_enabled          (boolean)
         * bluetooth_scan_threshold        (long)
         * </pre>
         * @hide
         */
        public static final String ANOMALY_DETECTION_CONSTANTS = "anomaly_detection_constants";

        /**
         * An integer to show the version of the anomaly config. Ex: 1, which means
         * current version is 1.
         * @hide
         */
        public static final String ANOMALY_CONFIG_VERSION = "anomaly_config_version";

        /**
         * A base64-encoded string represents anomaly stats config, used for
         * {@link android.app.StatsManager}.
         * @hide
         */
        public static final String ANOMALY_CONFIG = "anomaly_config";

        /**
         * Always on display(AOD) specific settings
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "prox_screen_off_delay=10000,screen_brightness_array=0:1:2:3:4"
         *
         * The following keys are supported:
         *
         * <pre>
         * screen_brightness_array         (int[])
         * dimming_scrim_array             (int[])
         * prox_screen_off_delay           (long)
         * prox_cooldown_trigger           (long)
         * prox_cooldown_period            (long)
         * </pre>
         * @hide
         */
        public static final String ALWAYS_ON_DISPLAY_CONSTANTS = "always_on_display_constants";

        /**
        * System VDSO global setting. This links to the "sys.vdso" system property.
        * The following values are supported:
        * false  -> both 32 and 64 bit vdso disabled
        * 32     -> 32 bit vdso enabled
        * 64     -> 64 bit vdso enabled
        * Any other value defaults to both 32 bit and 64 bit true.
        * @hide
        */
        public static final String SYS_VDSO = "sys_vdso";

        /**
        * UidCpuPower global setting. This links the sys.uidcpupower system property.
        * The following values are supported:
        * 0 -> /proc/uid_cpupower/* are disabled
        * 1 -> /proc/uid_cpupower/* are enabled
        * Any other value defaults to enabled.
        * @hide
        */
        public static final String SYS_UIDCPUPOWER = "sys_uidcpupower";

        /**
        * traced global setting. This controls weather the deamons: traced and
        * traced_probes run. This links the sys.traced system property.
        * The following values are supported:
        * 0 -> traced and traced_probes are disabled
        * 1 -> traced and traced_probes are enabled
        * Any other value defaults to disabled.
        * @hide
        */
        public static final String SYS_TRACED = "sys_traced";

        /**
         * An integer to reduce the FPS by this factor. Only for experiments. Need to reboot the
         * device for this setting to take full effect.
         *
         * @hide
         */
        public static final String FPS_DEVISOR = "fps_divisor";

        /**
         * Flag to enable or disable display panel low power mode (lpm)
         * false -> Display panel power saving mode is disabled.
         * true  -> Display panel power saving mode is enabled.
         *
         * @hide
         */
        public static final String DISPLAY_PANEL_LPM = "display_panel_lpm";

        /**
         * App standby (app idle) specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         * <p>
         * "idle_duration=5000,parole_interval=4500"
         * <p>
         * All durations are in millis.
         * The following keys are supported:
         *
         * <pre>
         * idle_duration2       (long)
         * wallclock_threshold  (long)
         * parole_interval      (long)
         * parole_duration      (long)
         *
         * idle_duration        (long) // This is deprecated and used to circumvent b/26355386.
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.usage.UsageStatsService.SettingsObserver
         */
        public static final String APP_IDLE_CONSTANTS = "app_idle_constants";

        /**
         * Power manager specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "no_cached_wake_locks=1"
         *
         * The following keys are supported:
         *
         * <pre>
         * no_cached_wake_locks                 (boolean)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.power.PowerManagerConstants
         */
        public static final String POWER_MANAGER_CONSTANTS = "power_manager_constants";

        /**
         * Alarm manager specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "min_futurity=5000,allow_while_idle_short_time=4500"
         *
         * The following keys are supported:
         *
         * <pre>
         * min_futurity                         (long)
         * min_interval                         (long)
         * allow_while_idle_short_time          (long)
         * allow_while_idle_long_time           (long)
         * allow_while_idle_whitelist_duration  (long)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.AlarmManagerService.Constants
         */
        public static final String ALARM_MANAGER_CONSTANTS = "alarm_manager_constants";

        /**
         * Job scheduler specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "min_ready_jobs_count=2,moderate_use_factor=.5"
         *
         * The following keys are supported:
         *
         * <pre>
         * min_idle_count                       (int)
         * min_charging_count                   (int)
         * min_connectivity_count               (int)
         * min_content_count                    (int)
         * min_ready_jobs_count                 (int)
         * heavy_use_factor                     (float)
         * moderate_use_factor                  (float)
         * fg_job_count                         (int)
         * bg_normal_job_count                  (int)
         * bg_moderate_job_count                (int)
         * bg_low_job_count                     (int)
         * bg_critical_job_count                (int)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.job.JobSchedulerService.Constants
         */
        public static final String JOB_SCHEDULER_CONSTANTS = "job_scheduler_constants";

        /**
         * ShortcutManager specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "reset_interval_sec=86400,max_updates_per_interval=1"
         *
         * The following keys are supported:
         *
         * <pre>
         * reset_interval_sec              (long)
         * max_updates_per_interval        (int)
         * max_icon_dimension_dp           (int, DP)
         * max_icon_dimension_dp_lowram    (int, DP)
         * max_shortcuts                   (int)
         * icon_quality                    (int, 0-100)
         * icon_format                     (String)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.pm.ShortcutService.ConfigConstants
         */
        public static final String SHORTCUT_MANAGER_CONSTANTS = "shortcut_manager_constants";

        /**
         * DevicePolicyManager specific settings.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * <pre>
         * das_died_service_reconnect_backoff_sec       (long)
         * das_died_service_reconnect_backoff_increase  (float)
         * das_died_service_reconnect_max_backoff_sec   (long)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * see also com.android.server.devicepolicy.DevicePolicyConstants
         */
        public static final String DEVICE_POLICY_CONSTANTS = "device_policy_constants";

        /**
         * TextClassifier specific settings.
         * This is encoded as a key=value list, separated by commas. String[] types like
         * entity_list_default use ":" as delimiter for values. Ex:
         *
         * <pre>
         * smart_linkify_enabled                    (boolean)
         * system_textclassifier_enabled            (boolean)
         * model_dark_launch_enabled                (boolean)
         * smart_selection_enabled                  (boolean)
         * smart_text_share_enabled                 (boolean)
         * smart_linkify_enabled                    (boolean)
         * smart_select_animation_enabled           (boolean)
         * suggest_selection_max_range_length       (int)
         * classify_text_max_range_length           (int)
         * generate_links_max_text_length           (int)
         * generate_links_log_sample_rate           (int)
         * entity_list_default                      (String[])
         * entity_list_not_editable                 (String[])
         * entity_list_editable                     (String[])
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * see also android.view.textclassifier.TextClassificationConstants
         */
        public static final String TEXT_CLASSIFIER_CONSTANTS = "text_classifier_constants";

        /**
         * BatteryStats specific settings.
         * This is encoded as a key=value list, separated by commas. Ex: "foo=1,bar=true"
         *
         * The following keys are supported:
         * <pre>
         * track_cpu_times_by_proc_state (boolean)
         * track_cpu_active_cluster_time (boolean)
         * read_binary_cpu_time          (boolean)
         * proc_state_cpu_times_read_delay_ms (long)
         * </pre>
         *
         * <p>
         * Type: string
         * @hide
         * see also com.android.internal.os.BatteryStatsImpl.Constants
         */
        public static final String BATTERY_STATS_CONSTANTS = "battery_stats_constants";

        /**
         * SyncManager specific settings.
         *
         * <p>
         * Type: string
         * @hide
         * @see com.android.server.content.SyncManagerConstants
         */
        public static final String SYNC_MANAGER_CONSTANTS = "sync_manager_constants";

        /**
         * Whether or not App Standby feature is enabled. This controls throttling of apps
         * based on usage patterns and predictions.
         * Type: int (0 for false, 1 for true)
         * Default: 1
         * @hide
         */
        public static final String APP_STANDBY_ENABLED = "app_standby_enabled";

        /**
         * Whether or not app auto restriction is enabled. When it is enabled, settings app will
         * auto restrict the app if it has bad behavior(e.g. hold wakelock for long time).
         *
         * Type: boolean (0 for false, 1 for true)
         * Default: 1
         *
         * @hide
         */
        public static final String APP_AUTO_RESTRICTION_ENABLED =
                "app_auto_restriction_enabled";

        private static final Validator APP_AUTO_RESTRICTION_ENABLED_VALIDATOR =
                BOOLEAN_VALIDATOR;

        /**
         * Feature flag to enable or disable the Forced App Standby feature.
         * Type: int (0 for false, 1 for true)
         * Default: 1
         * @hide
         */
        public static final String FORCED_APP_STANDBY_ENABLED = "forced_app_standby_enabled";

        /**
         * Whether or not to enable Forced App Standby on small battery devices.
         * Type: int (0 for false, 1 for true)
         * Default: 0
         * @hide
         */
        public static final String FORCED_APP_STANDBY_FOR_SMALL_BATTERY_ENABLED
                = "forced_app_standby_for_small_battery_enabled";

        /**
         * Whether or not to enable the Off Body, Radios Off feature on small battery devices.
         * Type: int (0 for false, 1 for true)
         * Default: 0
         * @hide
         */
        public static final String OFF_BODY_RADIOS_OFF_FOR_SMALL_BATTERY_ENABLED
                = "off_body_radios_off_for_small_battery_enabled";

        /**
         * How long after the device goes off body to disable radios, in milliseconds.
         * Type: long
         * Default: 10 minutes
         * @hide
         */
        public static final String OFF_BODY_RADIOS_OFF_DELAY_MS = "off_body_radios_off_delay_ms";

        /**
         * Whether or not to turn on Wifi when proxy is disconnected.
         * Type: int (0 for false, 1 for true)
         * Default: 1
         * @hide
         */
        public static final String WIFI_ON_WHEN_PROXY_DISCONNECTED
                = "wifi_on_when_proxy_disconnected";

        /**
         * Time Only Mode specific settings.
         * This is encoded as a key=value list, separated by commas. Ex: "foo=1,bar=true"
         *
         * The following keys are supported:
         *
         * <pre>
         * enabled                  (boolean)
         * disable_tilt_to_wake     (boolean)
         * disable_touch_to_wake    (boolean)
         * </pre>
         * Type: string
         * @hide
         */
        public static final String TIME_ONLY_MODE_CONSTANTS
                = "time_only_mode_constants";

        /**
         * Whether or not Network Watchlist feature is enabled.
         * Type: int (0 for false, 1 for true)
         * Default: 0
         * @hide
         */
        public static final String NETWORK_WATCHLIST_ENABLED = "network_watchlist_enabled";

        /**
         * Flag to keep background restricted profiles running after exiting. If disabled,
         * the restricted profile can be put into stopped state as soon as the user leaves it.
         * Type: int (0 for false, 1 for true)
         *
         * Overridden by the system based on device information. If null, the value specified
         * by {@code config_keepRestrictedProfilesInBackground} is used.
         *
         * @hide
         */
        public static final String KEEP_PROFILE_IN_BACKGROUND = "keep_profile_in_background";

        /**
         * Get the key that retrieves a bluetooth headset's priority.
         * @hide
         */
        public static final String getBluetoothHeadsetPriorityKey(String address) {
            return BLUETOOTH_HEADSET_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth a2dp sink's priority.
         * @hide
         */
        public static final String getBluetoothA2dpSinkPriorityKey(String address) {
            return BLUETOOTH_A2DP_SINK_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth a2dp src's priority.
         * @hide
         */
        public static final String getBluetoothA2dpSrcPriorityKey(String address) {
            return BLUETOOTH_A2DP_SRC_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth a2dp device's ability to support optional codecs.
         * @hide
         */
        public static final String getBluetoothA2dpSupportsOptionalCodecsKey(String address) {
            return BLUETOOTH_A2DP_SUPPORTS_OPTIONAL_CODECS_PREFIX +
                    address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves whether a bluetooth a2dp device should have optional codecs
         * enabled.
         * @hide
         */
        public static final String getBluetoothA2dpOptionalCodecsEnabledKey(String address) {
            return BLUETOOTH_A2DP_OPTIONAL_CODECS_ENABLED_PREFIX +
                    address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth Input Device's priority.
         * @hide
         */
        public static final String getBluetoothHidHostPriorityKey(String address) {
            return BLUETOOTH_INPUT_DEVICE_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth pan client priority.
         * @hide
         */
        public static final String getBluetoothPanPriorityKey(String address) {
            return BLUETOOTH_PAN_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth hearing aid priority.
         * @hide
         */
        public static final String getBluetoothHearingAidPriorityKey(String address) {
            return BLUETOOTH_HEARING_AID_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth map priority.
         * @hide
         */
        public static final String getBluetoothMapPriorityKey(String address) {
            return BLUETOOTH_MAP_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth map client priority.
         * @hide
         */
        public static final String getBluetoothMapClientPriorityKey(String address) {
            return BLUETOOTH_MAP_CLIENT_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth pbap client priority.
         * @hide
         */
        public static final String getBluetoothPbapClientPriorityKey(String address) {
            return BLUETOOTH_PBAP_CLIENT_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Get the key that retrieves a bluetooth sap priority.
         * @hide
         */
        public static final String getBluetoothSapPriorityKey(String address) {
            return BLUETOOTH_SAP_PRIORITY_PREFIX + address.toUpperCase(Locale.ROOT);
        }

        /**
         * Scaling factor for normal window animations. Setting to 0 will
         * disable window animations.
         */
        public static final String WINDOW_ANIMATION_SCALE = "window_animation_scale";

        /**
         * Scaling factor for activity transition animations. Setting to 0 will
         * disable window animations.
         */
        public static final String TRANSITION_ANIMATION_SCALE = "transition_animation_scale";

        /**
         * Scaling factor for Animator-based animations. This affects both the
         * start delay and duration of all such animations. Setting to 0 will
         * cause animations to end immediately. The default value is 1.
         */
        public static final String ANIMATOR_DURATION_SCALE = "animator_duration_scale";

        /**
         * Scaling factor for normal window animations. Setting to 0 will
         * disable window animations.
         *
         * @hide
         */
        public static final String FANCY_IME_ANIMATIONS = "fancy_ime_animations";

        /**
         * If 0, the compatibility mode is off for all applications.
         * If 1, older applications run under compatibility mode.
         * TODO: remove this settings before code freeze (bug/1907571)
         * @hide
         */
        public static final String COMPATIBILITY_MODE = "compatibility_mode";

        /**
         * CDMA only settings
         * Emergency Tone  0 = Off
         *                 1 = Alert
         *                 2 = Vibrate
         * @hide
         */
        public static final String EMERGENCY_TONE = "emergency_tone";

        private static final Validator EMERGENCY_TONE_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[] {"0", "1", "2"});

        /**
         * CDMA only settings
         * Whether the auto retry is enabled. The value is
         * boolean (1 or 0).
         * @hide
         */
        public static final String CALL_AUTO_RETRY = "call_auto_retry";

        private static final Validator CALL_AUTO_RETRY_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * A setting that can be read whether the emergency affordance is currently needed.
         * The value is a boolean (1 or 0).
         * @hide
         */
        public static final String EMERGENCY_AFFORDANCE_NEEDED = "emergency_affordance_needed";

        /**
         * See RIL_PreferredNetworkType in ril.h
         * @hide
         */
        public static final String PREFERRED_NETWORK_MODE =
                "preferred_network_mode";

        /**
         * Name of an application package to be debugged.
         */
        public static final String DEBUG_APP = "debug_app";

        /**
         * If 1, when launching DEBUG_APP it will wait for the debugger before
         * starting user code.  If 0, it will run normally.
         */
        public static final String WAIT_FOR_DEBUGGER = "wait_for_debugger";

        /**
         * Allow GPU debug layers?
         * 0 = no
         * 1 = yes
         * @hide
         */
        public static final String ENABLE_GPU_DEBUG_LAYERS = "enable_gpu_debug_layers";

        /**
         * App allowed to load GPU debug layers
         * @hide
         */
        public static final String GPU_DEBUG_APP = "gpu_debug_app";

        /**
         * Ordered GPU debug layer list
         * i.e. <layer1>:<layer2>:...:<layerN>
         * @hide
         */
        public static final String GPU_DEBUG_LAYERS = "gpu_debug_layers";

        /**
         * Control whether the process CPU usage meter should be shown.
         *
         * @deprecated This functionality is no longer available as of
         * {@link android.os.Build.VERSION_CODES#N_MR1}.
         */
        @Deprecated
        public static final String SHOW_PROCESSES = "show_processes";

        /**
         * If 1 low power mode (aka battery saver) is enabled.
         * @hide
         */
        @TestApi
        public static final String LOW_POWER_MODE = "low_power";

        /**
         * If 1, battery saver ({@link #LOW_POWER_MODE}) will be re-activated after the device
         * is unplugged from a charger or rebooted.
         * @hide
         */
        @TestApi
        public static final String LOW_POWER_MODE_STICKY = "low_power_sticky";

        /**
         * Battery level [1-100] at which low power mode automatically turns on.
         * If 0, it will not automatically turn on.
         * @hide
         */
        public static final String LOW_POWER_MODE_TRIGGER_LEVEL = "low_power_trigger_level";

        private static final Validator LOW_POWER_MODE_TRIGGER_LEVEL_VALIDATOR =
                new SettingsValidators.InclusiveIntegerRangeValidator(0, 100);


        /**
         * The max value for {@link #LOW_POWER_MODE_TRIGGER_LEVEL}. If this setting is not set
         * or the value is 0, the default max will be used.
         *
         * @hide
         */
        public static final String LOW_POWER_MODE_TRIGGER_LEVEL_MAX = "low_power_trigger_level_max";

         /**
         * If not 0, the activity manager will aggressively finish activities and
         * processes as soon as they are no longer needed.  If 0, the normal
         * extended lifetime is used.
         */
        public static final String ALWAYS_FINISH_ACTIVITIES = "always_finish_activities";

        /**
         * Use Dock audio output for media:
         *      0 = disabled
         *      1 = enabled
         * @hide
         */
        public static final String DOCK_AUDIO_MEDIA_ENABLED = "dock_audio_media_enabled";

        private static final Validator DOCK_AUDIO_MEDIA_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;

        /**
         * The surround sound formats AC3, DTS or IEC61937 are
         * available for use if they are detected.
         * This is the default mode.
         *
         * Note that AUTO is equivalent to ALWAYS for Android TVs and other
         * devices that have an S/PDIF output. This is because S/PDIF
         * is unidirectional and the TV cannot know if a decoder is
         * connected. So it assumes they are always available.
         * @hide
         */
         public static final int ENCODED_SURROUND_OUTPUT_AUTO = 0;

        /**
         * AC3, DTS or IEC61937 are NEVER available, even if they
         * are detected by the hardware. Those formats will not be
         * reported.
         *
         * An example use case would be an AVR reports that it is capable of
         * surround sound decoding but is broken. If NEVER is chosen
         * then apps must use PCM output instead of encoded output.
         * @hide
         */
         public static final int ENCODED_SURROUND_OUTPUT_NEVER = 1;

        /**
         * AC3, DTS or IEC61937 are ALWAYS available, even if they
         * are not detected by the hardware. Those formats will be
         * reported as part of the HDMI output capability. Applications
         * are then free to use either PCM or encoded output.
         *
         * An example use case would be a when TV was connected over
         * TOS-link to an AVR. But the TV could not see it because TOS-link
         * is unidirectional.
         * @hide
         */
         public static final int ENCODED_SURROUND_OUTPUT_ALWAYS = 2;

        /**
         * Set to ENCODED_SURROUND_OUTPUT_AUTO,
         * ENCODED_SURROUND_OUTPUT_NEVER or
         * ENCODED_SURROUND_OUTPUT_ALWAYS
         * @hide
         */
        public static final String ENCODED_SURROUND_OUTPUT = "encoded_surround_output";

        private static final Validator ENCODED_SURROUND_OUTPUT_VALIDATOR =
                new SettingsValidators.DiscreteValueValidator(new String[] {"0", "1", "2"});

        /**
         * Persisted safe headphone volume management state by AudioService
         * @hide
         */
        public static final String AUDIO_SAFE_VOLUME_STATE = "audio_safe_volume_state";

        /**
         * URL for tzinfo (time zone) updates
         * @hide
         */
        public static final String TZINFO_UPDATE_CONTENT_URL = "tzinfo_content_url";

        /**
         * URL for tzinfo (time zone) update metadata
         * @hide
         */
        public static final String TZINFO_UPDATE_METADATA_URL = "tzinfo_metadata_url";

        /**
         * URL for selinux (mandatory access control) updates
         * @hide
         */
        public static final String SELINUX_UPDATE_CONTENT_URL = "selinux_content_url";

        /**
         * URL for selinux (mandatory access control) update metadata
         * @hide
         */
        public static final String SELINUX_UPDATE_METADATA_URL = "selinux_metadata_url";

        /**
         * URL for sms short code updates
         * @hide
         */
        public static final String SMS_SHORT_CODES_UPDATE_CONTENT_URL =
                "sms_short_codes_content_url";

        /**
         * URL for sms short code update metadata
         * @hide
         */
        public static final String SMS_SHORT_CODES_UPDATE_METADATA_URL =
                "sms_short_codes_metadata_url";

        /**
         * URL for apn_db updates
         * @hide
         */
        public static final String APN_DB_UPDATE_CONTENT_URL = "apn_db_content_url";

        /**
         * URL for apn_db update metadata
         * @hide
         */
        public static final String APN_DB_UPDATE_METADATA_URL = "apn_db_metadata_url";

        /**
         * URL for cert pinlist updates
         * @hide
         */
        public static final String CERT_PIN_UPDATE_CONTENT_URL = "cert_pin_content_url";

        /**
         * URL for cert pinlist updates
         * @hide
         */
        public static final String CERT_PIN_UPDATE_METADATA_URL = "cert_pin_metadata_url";

        /**
         * URL for intent firewall updates
         * @hide
         */
        public static final String INTENT_FIREWALL_UPDATE_CONTENT_URL =
                "intent_firewall_content_url";

        /**
         * URL for intent firewall update metadata
         * @hide
         */
        public static final String INTENT_FIREWALL_UPDATE_METADATA_URL =
                "intent_firewall_metadata_url";

        /**
         * URL for lang id model updates
         * @hide
         */
        public static final String LANG_ID_UPDATE_CONTENT_URL = "lang_id_content_url";

        /**
         * URL for lang id model update metadata
         * @hide
         */
        public static final String LANG_ID_UPDATE_METADATA_URL = "lang_id_metadata_url";

        /**
         * URL for smart selection model updates
         * @hide
         */
        public static final String SMART_SELECTION_UPDATE_CONTENT_URL =
                "smart_selection_content_url";

        /**
         * URL for smart selection model update metadata
         * @hide
         */
        public static final String SMART_SELECTION_UPDATE_METADATA_URL =
                "smart_selection_metadata_url";

        /**
         * SELinux enforcement status. If 0, permissive; if 1, enforcing.
         * @hide
         */
        public static final String SELINUX_STATUS = "selinux_status";

        /**
         * Developer setting to force RTL layout.
         * @hide
         */
        public static final String DEVELOPMENT_FORCE_RTL = "debug.force_rtl";

        /**
         * Milliseconds after screen-off after which low battery sounds will be silenced.
         *
         * If zero, battery sounds will always play.
         * Defaults to @integer/def_low_battery_sound_timeout in SettingsProvider.
         *
         * @hide
         */
        public static final String LOW_BATTERY_SOUND_TIMEOUT = "low_battery_sound_timeout";

        /**
         * Milliseconds to wait before bouncing Wi-Fi after settings is restored. Note that after
         * the caller is done with this, they should call {@link ContentResolver#delete} to
         * clean up any value that they may have written.
         *
         * @hide
         */
        public static final String WIFI_BOUNCE_DELAY_OVERRIDE_MS = "wifi_bounce_delay_override_ms";

        /**
         * Defines global runtime overrides to window policy.
         *
         * See {@link com.android.server.policy.PolicyControl} for value format.
         *
         * @hide
         */
        public static final String POLICY_CONTROL = "policy_control";

        /**
         * {@link android.view.DisplayCutout DisplayCutout} emulation mode.
         *
         * @hide
         */
        public static final String EMULATE_DISPLAY_CUTOUT = "emulate_display_cutout";

        /** @hide */ public static final int EMULATE_DISPLAY_CUTOUT_OFF = 0;
        /** @hide */ public static final int EMULATE_DISPLAY_CUTOUT_ON = 1;

        /**
         * Defines global zen mode.  ZEN_MODE_OFF, ZEN_MODE_IMPORTANT_INTERRUPTIONS,
         * or ZEN_MODE_NO_INTERRUPTIONS.
         *
         * @hide
         */
        public static final String ZEN_MODE = "zen_mode";

        /** @hide */ public static final int ZEN_MODE_OFF = 0;
        /** @hide */ public static final int ZEN_MODE_IMPORTANT_INTERRUPTIONS = 1;
        /** @hide */ public static final int ZEN_MODE_NO_INTERRUPTIONS = 2;
        /** @hide */ public static final int ZEN_MODE_ALARMS = 3;

        /** @hide */ public static String zenModeToString(int mode) {
            if (mode == ZEN_MODE_IMPORTANT_INTERRUPTIONS) return "ZEN_MODE_IMPORTANT_INTERRUPTIONS";
            if (mode == ZEN_MODE_ALARMS) return "ZEN_MODE_ALARMS";
            if (mode == ZEN_MODE_NO_INTERRUPTIONS) return "ZEN_MODE_NO_INTERRUPTIONS";
            return "ZEN_MODE_OFF";
        }

        /** @hide */ public static boolean isValidZenMode(int value) {
            switch (value) {
                case Global.ZEN_MODE_OFF:
                case Global.ZEN_MODE_IMPORTANT_INTERRUPTIONS:
                case Global.ZEN_MODE_ALARMS:
                case Global.ZEN_MODE_NO_INTERRUPTIONS:
                    return true;
                default:
                    return false;
            }
        }

        /**
         * Value of the ringer before entering zen mode.
         *
         * @hide
         */
        public static final String ZEN_MODE_RINGER_LEVEL = "zen_mode_ringer_level";

        /**
         * Opaque value, changes when persisted zen mode configuration changes.
         *
         * @hide
         */
        public static final String ZEN_MODE_CONFIG_ETAG = "zen_mode_config_etag";

        /**
         * If 0, turning on dnd manually will last indefinitely.
         * Else if non-negative, turning on dnd manually will last for this many minutes.
         * Else (if negative), turning on dnd manually will surface a dialog that prompts
         * user to specify a duration.
         * @hide
         */
        public static final String ZEN_DURATION = "zen_duration";

        private static final Validator ZEN_DURATION_VALIDATOR = ANY_INTEGER_VALIDATOR;

        /** @hide */ public static final int ZEN_DURATION_PROMPT = -1;
        /** @hide */ public static final int ZEN_DURATION_FOREVER = 0;

        /**
         * Defines global heads up toggle.  One of HEADS_UP_OFF, HEADS_UP_ON.
         *
         * @hide
         */
        public static final String HEADS_UP_NOTIFICATIONS_ENABLED =
                "heads_up_notifications_enabled";

        /** @hide */ public static final int HEADS_UP_OFF = 0;
        /** @hide */ public static final int HEADS_UP_ON = 1;

        /**
         * The name of the device
         */
        public static final String DEVICE_NAME = "device_name";

        /**
         * Whether the NetworkScoringService has been first initialized.
         * <p>
         * Type: int (0 for false, 1 for true)
         * @hide
         */
        public static final String NETWORK_SCORING_PROVISIONED = "network_scoring_provisioned";

        /**
         * Whether the user wants to be prompted for password to decrypt the device on boot.
         * This only matters if the storage is encrypted.
         * <p>
         * Type: int (0 for false, 1 for true)
         * @hide
         */
        public static final String REQUIRE_PASSWORD_TO_DECRYPT = "require_password_to_decrypt";

        /**
         * Whether the Volte is enabled. If this setting is not set then we use the Carrier Config
         * value {@link CarrierConfigManager#KEY_ENHANCED_4G_LTE_ON_BY_DEFAULT_BOOL}.
         * <p>
         * Type: int (0 for false, 1 for true)
         * @hide
         * @deprecated Use {@link android.telephony.SubscriptionManager#ENHANCED_4G_MODE_ENABLED}
         * instead.
         */
        @Deprecated
        public static final String ENHANCED_4G_MODE_ENABLED =
                SubscriptionManager.ENHANCED_4G_MODE_ENABLED;

        /**
         * Whether VT (Video Telephony over IMS) is enabled
         * <p>
         * Type: int (0 for false, 1 for true)
         *
         * @hide
         * @deprecated Use {@link android.telephony.SubscriptionManager#VT_IMS_ENABLED} instead.
         */
        @Deprecated
        public static final String VT_IMS_ENABLED = SubscriptionManager.VT_IMS_ENABLED;

        /**
         * Whether WFC is enabled
         * <p>
         * Type: int (0 for false, 1 for true)
         *
         * @hide
         * @deprecated Use {@link android.telephony.SubscriptionManager#WFC_IMS_ENABLED} instead.
         */
        @Deprecated
        public static final String WFC_IMS_ENABLED = SubscriptionManager.WFC_IMS_ENABLED;

        /**
         * WFC mode on home/non-roaming network.
         * <p>
         * Type: int - 2=Wi-Fi preferred, 1=Cellular preferred, 0=Wi-Fi only
         *
         * @hide
         * @deprecated Use {@link android.telephony.SubscriptionManager#WFC_IMS_MODE} instead.
         */
        @Deprecated
        public static final String WFC_IMS_MODE = SubscriptionManager.WFC_IMS_MODE;

        /**
         * WFC mode on roaming network.
         * <p>
         * Type: int - see {@link #WFC_IMS_MODE} for values
         *
         * @hide
         * @deprecated Use {@link android.telephony.SubscriptionManager#WFC_IMS_ROAMING_MODE}
         * instead.
         */
        @Deprecated
        public static final String WFC_IMS_ROAMING_MODE = SubscriptionManager.WFC_IMS_ROAMING_MODE;

        /**
         * Whether WFC roaming is enabled
         * <p>
         * Type: int (0 for false, 1 for true)
         *
         * @hide
         * @deprecated Use {@link android.telephony.SubscriptionManager#WFC_IMS_ROAMING_ENABLED}
         * instead
         */
        @Deprecated
        public static final String WFC_IMS_ROAMING_ENABLED =
                SubscriptionManager.WFC_IMS_ROAMING_ENABLED;

        /**
         * Whether user can enable/disable LTE as a preferred network. A carrier might control
         * this via gservices, OMA-DM, carrier app, etc.
         * <p>
         * Type: int (0 for false, 1 for true)
         * @hide
         */
        public static final String LTE_SERVICE_FORCED = "lte_service_forced";

        /**
         * Ephemeral app cookie max size in bytes.
         * <p>
         * Type: int
         * @hide
         */
        public static final String EPHEMERAL_COOKIE_MAX_SIZE_BYTES =
                "ephemeral_cookie_max_size_bytes";

        /**
         * Toggle to enable/disable the entire ephemeral feature. By default, ephemeral is
         * enabled. Set to zero to disable.
         * <p>
         * Type: int (0 for false, 1 for true)
         *
         * @hide
         */
        public static final String ENABLE_EPHEMERAL_FEATURE = "enable_ephemeral_feature";

        /**
         * Toggle to enable/disable dexopt for instant applications. The default is for dexopt
         * to be disabled.
         * <p>
         * Type: int (0 to disable, 1 to enable)
         *
         * @hide
         */
        public static final String INSTANT_APP_DEXOPT_ENABLED = "instant_app_dexopt_enabled";

        /**
         * The min period for caching installed instant apps in milliseconds.
         * <p>
         * Type: long
         * @hide
         */
        public static final String INSTALLED_INSTANT_APP_MIN_CACHE_PERIOD =
                "installed_instant_app_min_cache_period";

        /**
         * The max period for caching installed instant apps in milliseconds.
         * <p>
         * Type: long
         * @hide
         */
        public static final String INSTALLED_INSTANT_APP_MAX_CACHE_PERIOD =
                "installed_instant_app_max_cache_period";

        /**
         * The min period for caching uninstalled instant apps in milliseconds.
         * <p>
         * Type: long
         * @hide
         */
        public static final String UNINSTALLED_INSTANT_APP_MIN_CACHE_PERIOD =
                "uninstalled_instant_app_min_cache_period";

        /**
         * The max period for caching uninstalled instant apps in milliseconds.
         * <p>
         * Type: long
         * @hide
         */
        public static final String UNINSTALLED_INSTANT_APP_MAX_CACHE_PERIOD =
                "uninstalled_instant_app_max_cache_period";

        /**
         * The min period for caching unused static shared libs in milliseconds.
         * <p>
         * Type: long
         * @hide
         */
        public static final String UNUSED_STATIC_SHARED_LIB_MIN_CACHE_PERIOD =
                "unused_static_shared_lib_min_cache_period";

        /**
         * Allows switching users when system user is locked.
         * <p>
         * Type: int
         * @hide
         */
        public static final String ALLOW_USER_SWITCHING_WHEN_SYSTEM_USER_LOCKED =
                "allow_user_switching_when_system_user_locked";

        /**
         * Boot count since the device starts running API level 24.
         * <p>
         * Type: int
         */
        public static final String BOOT_COUNT = "boot_count";

        /**
         * Whether the safe boot is disallowed.
         *
         * <p>This setting should have the identical value as the corresponding user restriction.
         * The purpose of the setting is to make the restriction available in early boot stages
         * before the user restrictions are loaded.
         * @hide
         */
        public static final String SAFE_BOOT_DISALLOWED = "safe_boot_disallowed";

        /**
         * Whether this device is currently in retail demo mode. If true, device
         * usage is severely limited.
         * <p>
         * Type: int (0 for false, 1 for true)
         * @hide
         */
        public static final String DEVICE_DEMO_MODE = "device_demo_mode";

        /**
         * Indicates the maximum time that an app is blocked for the network rules to get updated.
         *
         * Type: long
         *
         * @hide
         */
        public static final String NETWORK_ACCESS_TIMEOUT_MS = "network_access_timeout_ms";

        /**
         * The reason for the settings database being downgraded. This is only for
         * troubleshooting purposes and its value should not be interpreted in any way.
         *
         * Type: string
         *
         * @hide
         */
        public static final String DATABASE_DOWNGRADE_REASON = "database_downgrade_reason";

        /**
         * The build id of when the settings database was first created (or re-created due it
         * being missing).
         *
         * Type: string
         *
         * @hide
         */
        public static final String DATABASE_CREATION_BUILDID = "database_creation_buildid";

        /**
         * Flag to toggle journal mode WAL on or off for the contacts database. WAL is enabled by
         * default. Set to 0 to disable.
         *
         * @hide
         */
        public static final String CONTACTS_DATABASE_WAL_ENABLED = "contacts_database_wal_enabled";

        /**
         * Flag to enable the link to location permissions in location setting. Set to 0 to disable.
         *
         * @hide
         */
        public static final String LOCATION_SETTINGS_LINK_TO_PERMISSIONS_ENABLED =
                "location_settings_link_to_permissions_enabled";

        /**
         * Flag to set the waiting time for euicc factory reset inside System > Settings
         * Type: long
         *
         * @hide
         */
        public static final String EUICC_FACTORY_RESET_TIMEOUT_MILLIS =
                "euicc_factory_reset_timeout_millis";

        /**
         * Flag to set the timeout for when to refresh the storage settings cached data.
         * Type: long
         *
         * @hide
         */
        public static final String STORAGE_SETTINGS_CLOBBER_THRESHOLD =
                "storage_settings_clobber_threshold";

        /**
         * If set to 1, {@link Secure#LOCATION_MODE} will be set to {@link Secure#LOCATION_MODE_OFF}
         * temporarily for all users.
         *
         * @hide
         */
        @TestApi
        public static final String LOCATION_GLOBAL_KILL_SWITCH =
                "location_global_kill_switch";

        /**
         * If set to 1, SettingsProvider's restoreAnyVersion="true" attribute will be ignored
         * and restoring to lower version of platform API will be skipped.
         *
         * @hide
         */
        public static final String OVERRIDE_SETTINGS_PROVIDER_RESTORE_ANY_VERSION =
                "override_settings_provider_restore_any_version";
        /**
         * Flag to toggle whether system services report attribution chains when they attribute
         * battery use via a {@code WorkSource}.
         *
         * Type: int (0 to disable, 1 to enable)
         *
         * @hide
         */
        public static final String CHAINED_BATTERY_ATTRIBUTION_ENABLED =
                "chained_battery_attribution_enabled";

        /**
         * The packages whitelisted to be run in autofill compatibility mode. The list
         * of packages is {@code ":"} colon delimited, and each entry has the name of the
         * package and an optional list of url bar resource ids (the list is delimited by
         * brackets&mdash{@code [} and {@code ]}&mdash and is also comma delimited).
         *
         * <p>For example, a list with 3 packages {@code p1}, {@code p2}, and {@code p3}, where
         * package {@code p1} have one id ({@code url_bar}, {@code p2} has none, and {@code p3 }
         * have 2 ids {@code url_foo} and {@code url_bas}) would be
         * {@code p1[url_bar]:p2:p3[url_foo,url_bas]}
         *
         * @hide
         */
        @SystemApi
        @TestApi
        public static final String AUTOFILL_COMPAT_MODE_ALLOWED_PACKAGES =
                "autofill_compat_mode_allowed_packages";

        /**
         * Exemptions to the hidden API blacklist.
         *
         * @hide
         */
        @TestApi
        public static final String HIDDEN_API_BLACKLIST_EXEMPTIONS =
                "hidden_api_blacklist_exemptions";

        /**
         * Timeout for a single {@link android.media.soundtrigger.SoundTriggerDetectionService}
         * operation (in ms).
         *
         * @hide
         */
        public static final String SOUND_TRIGGER_DETECTION_SERVICE_OP_TIMEOUT =
                "sound_trigger_detection_service_op_timeout";

        /**
         * Maximum number of {@link android.media.soundtrigger.SoundTriggerDetectionService}
         * operations per day.
         *
         * @hide
         */
        public static final String MAX_SOUND_TRIGGER_DETECTION_SERVICE_OPS_PER_DAY =
                "max_sound_trigger_detection_service_ops_per_day";

        /**
         * Settings to backup. This is here so that it's in the same place as the settings
         * keys and easy to update.
         *
         * These keys may be mentioned in the SETTINGS_TO_BACKUP arrays in System
         * and Secure as well.  This is because those tables drive both backup and
         * restore, and restore needs to properly whitelist keys that used to live
         * in those namespaces.  The keys will only actually be backed up / restored
         * if they are also mentioned in this table (Global.SETTINGS_TO_BACKUP).
         *
         * NOTE: Settings are backed up and restored in the order they appear
         *       in this array. If you have one setting depending on another,
         *       make sure that they are ordered appropriately.
         *
         * @hide
         */
        public static final String[] SETTINGS_TO_BACKUP = {
            BUGREPORT_IN_POWER_MENU,
            STAY_ON_WHILE_PLUGGED_IN,
            APP_AUTO_RESTRICTION_ENABLED,
            AUTO_TIME,
            AUTO_TIME_ZONE,
            POWER_SOUNDS_ENABLED,
            DOCK_SOUNDS_ENABLED,
            CHARGING_SOUNDS_ENABLED,
            USB_MASS_STORAGE_ENABLED,
            NETWORK_RECOMMENDATIONS_ENABLED,
            WIFI_WAKEUP_ENABLED,
            WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON,
            WIFI_CARRIER_NETWORKS_AVAILABLE_NOTIFICATION_ON,
            USE_OPEN_WIFI_PACKAGE,
            WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED,
            EMERGENCY_TONE,
            CALL_AUTO_RETRY,
            DOCK_AUDIO_MEDIA_ENABLED,
            ENCODED_SURROUND_OUTPUT,
            LOW_POWER_MODE_TRIGGER_LEVEL,
            BLUETOOTH_ON,
            PRIVATE_DNS_MODE,
            PRIVATE_DNS_SPECIFIER,
            SOFT_AP_TIMEOUT_ENABLED,
            ZEN_DURATION,
        };

        /**
         * All settings in {@link SETTINGS_TO_BACKUP} array *must* have a non-null validator,
         * otherwise they won't be restored.
         *
         * @hide
         */
        public static final Map<String, Validator> VALIDATORS = new ArrayMap<>();
        static {
            VALIDATORS.put(BUGREPORT_IN_POWER_MENU, BUGREPORT_IN_POWER_MENU_VALIDATOR);
            VALIDATORS.put(STAY_ON_WHILE_PLUGGED_IN, STAY_ON_WHILE_PLUGGED_IN_VALIDATOR);
            VALIDATORS.put(AUTO_TIME, AUTO_TIME_VALIDATOR);
            VALIDATORS.put(AUTO_TIME_ZONE, AUTO_TIME_ZONE_VALIDATOR);
            VALIDATORS.put(POWER_SOUNDS_ENABLED, POWER_SOUNDS_ENABLED_VALIDATOR);
            VALIDATORS.put(DOCK_SOUNDS_ENABLED, DOCK_SOUNDS_ENABLED_VALIDATOR);
            VALIDATORS.put(CHARGING_SOUNDS_ENABLED, CHARGING_SOUNDS_ENABLED_VALIDATOR);
            VALIDATORS.put(USB_MASS_STORAGE_ENABLED, USB_MASS_STORAGE_ENABLED_VALIDATOR);
            VALIDATORS.put(NETWORK_RECOMMENDATIONS_ENABLED,
                    NETWORK_RECOMMENDATIONS_ENABLED_VALIDATOR);
            VALIDATORS.put(WIFI_WAKEUP_ENABLED, WIFI_WAKEUP_ENABLED_VALIDATOR);
            VALIDATORS.put(WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON,
                    WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON_VALIDATOR);
            VALIDATORS.put(USE_OPEN_WIFI_PACKAGE, USE_OPEN_WIFI_PACKAGE_VALIDATOR);
            VALIDATORS.put(WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED,
                    WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED_VALIDATOR);
            VALIDATORS.put(EMERGENCY_TONE, EMERGENCY_TONE_VALIDATOR);
            VALIDATORS.put(CALL_AUTO_RETRY, CALL_AUTO_RETRY_VALIDATOR);
            VALIDATORS.put(DOCK_AUDIO_MEDIA_ENABLED, DOCK_AUDIO_MEDIA_ENABLED_VALIDATOR);
            VALIDATORS.put(ENCODED_SURROUND_OUTPUT, ENCODED_SURROUND_OUTPUT_VALIDATOR);
            VALIDATORS.put(LOW_POWER_MODE_TRIGGER_LEVEL, LOW_POWER_MODE_TRIGGER_LEVEL_VALIDATOR);
            VALIDATORS.put(LOW_POWER_MODE_TRIGGER_LEVEL_MAX,
                    LOW_POWER_MODE_TRIGGER_LEVEL_VALIDATOR);
            VALIDATORS.put(BLUETOOTH_ON, BLUETOOTH_ON_VALIDATOR);
            VALIDATORS.put(PRIVATE_DNS_MODE, PRIVATE_DNS_MODE_VALIDATOR);
            VALIDATORS.put(PRIVATE_DNS_SPECIFIER, PRIVATE_DNS_SPECIFIER_VALIDATOR);
            VALIDATORS.put(SOFT_AP_TIMEOUT_ENABLED, SOFT_AP_TIMEOUT_ENABLED_VALIDATOR);
            VALIDATORS.put(WIFI_CARRIER_NETWORKS_AVAILABLE_NOTIFICATION_ON,
                    WIFI_CARRIER_NETWORKS_AVAILABLE_NOTIFICATION_ON_VALIDATOR);
            VALIDATORS.put(APP_AUTO_RESTRICTION_ENABLED, APP_AUTO_RESTRICTION_ENABLED_VALIDATOR);
            VALIDATORS.put(ZEN_DURATION, ZEN_DURATION_VALIDATOR);
        }

        /**
         * Global settings that shouldn't be persisted.
         *
         * @hide
         */
        public static final String[] TRANSIENT_SETTINGS = {
                LOCATION_GLOBAL_KILL_SWITCH,
        };

        /**
         * Keys we no longer back up under the current schema, but want to continue to
         * process when restoring historical backup datasets.
         *
         * All settings in {@link LEGACY_RESTORE_SETTINGS} array *must* have a non-null validator,
         * otherwise they won't be restored.
         *
         * @hide
         */
        public static final String[] LEGACY_RESTORE_SETTINGS = {
        };

        private static final ContentProviderHolder sProviderHolder =
                new ContentProviderHolder(CONTENT_URI);

        // Populated lazily, guarded by class object:
        private static final NameValueCache sNameValueCache = new NameValueCache(
                    CONTENT_URI,
                    CALL_METHOD_GET_GLOBAL,
                    CALL_METHOD_PUT_GLOBAL,
                    sProviderHolder);

        // Certain settings have been moved from global to the per-user secure namespace
        private static final HashSet<String> MOVED_TO_SECURE;
        static {
            MOVED_TO_SECURE = new HashSet<>(1);
            MOVED_TO_SECURE.add(Settings.Global.INSTALL_NON_MARKET_APPS);
        }

        /** @hide */
        public static void getMovedToSecureSettings(Set<String> outKeySet) {
            outKeySet.addAll(MOVED_TO_SECURE);
        }

        /** @hide */
        public static void clearProviderForTest() {
            sProviderHolder.clearProviderForTest();
            sNameValueCache.clearGenerationTrackerForTest();
        }

        /**
         * Look up a name in the database.
         * @param resolver to access the database with
         * @param name to look up in the table
         * @return the corresponding value, or null if not present
         */
        public static String getString(ContentResolver resolver, String name) {
            return getStringForUser(resolver, name, resolver.getUserId());
        }

        /** @hide */
        public static String getStringForUser(ContentResolver resolver, String name,
                int userHandle) {
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.Global"
                        + " to android.provider.Settings.Secure, returning read-only value.");
                return Secure.getStringForUser(resolver, name, userHandle);
            }
            return sNameValueCache.getStringForUser(resolver, name, userHandle);
        }

        /**
         * Store a name/value pair into the database.
         * @param resolver to access the database with
         * @param name to store
         * @param value to associate with the name
         * @return true if the value was set, false on database errors
         */
        public static boolean putString(ContentResolver resolver,
                String name, String value) {
            return putStringForUser(resolver, name, value, null, false, resolver.getUserId());
        }

        /**
         * Store a name/value pair into the database.
         * <p>
         * The method takes an optional tag to associate with the setting
         * which can be used to clear only settings made by your package and
         * associated with this tag by passing the tag to {@link
         * #resetToDefaults(ContentResolver, String)}. Anyone can override
         * the current tag. Also if another package changes the setting
         * then the tag will be set to the one specified in the set call
         * which can be null. Also any of the settings setters that do not
         * take a tag as an argument effectively clears the tag.
         * </p><p>
         * For example, if you set settings A and B with tags T1 and T2 and
         * another app changes setting A (potentially to the same value), it
         * can assign to it a tag T3 (note that now the package that changed
         * the setting is not yours). Now if you reset your changes for T1 and
         * T2 only setting B will be reset and A not (as it was changed by
         * another package) but since A did not change you are in the desired
         * initial state. Now if the other app changes the value of A (assuming
         * you registered an observer in the beginning) you would detect that
         * the setting was changed by another app and handle this appropriately
         * (ignore, set back to some value, etc).
         * </p><p>
         * Also the method takes an argument whether to make the value the
         * default for this setting. If the system already specified a default
         * value, then the one passed in here will <strong>not</strong>
         * be set as the default.
         * </p>
         *
         * @param resolver to access the database with.
         * @param name to store.
         * @param value to associate with the name.
         * @param tag to associated with the setting.
         * @param makeDefault whether to make the value the default one.
         * @return true if the value was set, false on database errors.
         *
         * @see #resetToDefaults(ContentResolver, String)
         *
         * @hide
         */
        @SystemApi
        @RequiresPermission(Manifest.permission.WRITE_SECURE_SETTINGS)
        public static boolean putString(@NonNull ContentResolver resolver,
                @NonNull String name, @Nullable String value, @Nullable String tag,
                boolean makeDefault) {
            return putStringForUser(resolver, name, value, tag, makeDefault,
                    resolver.getUserId());
        }

        /**
         * Reset the settings to their defaults. This would reset <strong>only</strong>
         * settings set by the caller's package. Think of it of a way to undo your own
         * changes to the secure settings. Passing in the optional tag will reset only
         * settings changed by your package and associated with this tag.
         *
         * @param resolver Handle to the content resolver.
         * @param tag Optional tag which should be associated with the settings to reset.
         *
         * @see #putString(ContentResolver, String, String, String, boolean)
         *
         * @hide
         */
        @SystemApi
        @RequiresPermission(Manifest.permission.WRITE_SECURE_SETTINGS)
        public static void resetToDefaults(@NonNull ContentResolver resolver,
                @Nullable String tag) {
            resetToDefaultsAsUser(resolver, tag, RESET_MODE_PACKAGE_DEFAULTS,
                    resolver.getUserId());
        }

        /**
         * Reset the settings to their defaults for a given user with a specific mode. The
         * optional tag argument is valid only for {@link #RESET_MODE_PACKAGE_DEFAULTS}
         * allowing resetting the settings made by a package and associated with the tag.
         *
         * @param resolver Handle to the content resolver.
         * @param tag Optional tag which should be associated with the settings to reset.
         * @param mode The reset mode.
         * @param userHandle The user for which to reset to defaults.
         *
         * @see #RESET_MODE_PACKAGE_DEFAULTS
         * @see #RESET_MODE_UNTRUSTED_DEFAULTS
         * @see #RESET_MODE_UNTRUSTED_CHANGES
         * @see #RESET_MODE_TRUSTED_DEFAULTS
         *
         * @hide
         */
        public static void resetToDefaultsAsUser(@NonNull ContentResolver resolver,
                @Nullable String tag, @ResetMode int mode, @IntRange(from = 0) int userHandle) {
            try {
                Bundle arg = new Bundle();
                arg.putInt(CALL_METHOD_USER_KEY, userHandle);
                if (tag != null) {
                    arg.putString(CALL_METHOD_TAG_KEY, tag);
                }
                arg.putInt(CALL_METHOD_RESET_MODE_KEY, mode);
                IContentProvider cp = sProviderHolder.getProvider(resolver);
                cp.call(resolver.getPackageName(), CALL_METHOD_RESET_GLOBAL, null, arg);
            } catch (RemoteException e) {
                Log.w(TAG, "Can't reset do defaults for " + CONTENT_URI, e);
            }
        }

        /** @hide */
        public static boolean putStringForUser(ContentResolver resolver,
                String name, String value, int userHandle) {
            return putStringForUser(resolver, name, value, null, false, userHandle);
        }

        /** @hide */
        public static boolean putStringForUser(@NonNull ContentResolver resolver,
                @NonNull String name, @Nullable String value, @Nullable String tag,
                boolean makeDefault, @UserIdInt int userHandle) {
            if (LOCAL_LOGV) {
                Log.v(TAG, "Global.putString(name=" + name + ", value=" + value
                        + " for " + userHandle);
            }
            // Global and Secure have the same access policy so we can forward writes
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.Global"
                        + " to android.provider.Settings.Secure, value is unchanged.");
                return Secure.putStringForUser(resolver, name, value, tag,
                        makeDefault, userHandle);
            }
            return sNameValueCache.putStringForUser(resolver, name, value, tag,
                    makeDefault, userHandle);
        }

        /**
         * Construct the content URI for a particular name/value pair,
         * useful for monitoring changes with a ContentObserver.
         * @param name to look up in the table
         * @return the corresponding content URI, or null if not present
         */
        public static Uri getUriFor(String name) {
            return getUriFor(CONTENT_URI, name);
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as an integer.  Note that internally setting values are always
         * stored as strings; this function converts the string to an integer
         * for you.  The default value will be returned if the setting is
         * not defined or not an integer.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid integer.
         */
        public static int getInt(ContentResolver cr, String name, int def) {
            String v = getString(cr, name);
            try {
                return v != null ? Integer.parseInt(v) : def;
            } catch (NumberFormatException e) {
                return def;
            }
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as an integer.  Note that internally setting values are always
         * stored as strings; this function converts the string to an integer
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not an integer.
         *
         * @return The setting's current value.
         */
        public static int getInt(ContentResolver cr, String name)
                throws SettingNotFoundException {
            String v = getString(cr, name);
            try {
                return Integer.parseInt(v);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a single settings value as an
         * integer. This will either create a new entry in the table if the
         * given name does not exist, or modify the value of the existing row
         * with that name.  Note that internally setting values are always
         * stored as strings, so this function converts the given value to a
         * string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putInt(ContentResolver cr, String name, int value) {
            return putString(cr, name, Integer.toString(value));
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a {@code long}.  Note that internally setting values are always
         * stored as strings; this function converts the string to a {@code long}
         * for you.  The default value will be returned if the setting is
         * not defined or not a {@code long}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid {@code long}.
         */
        public static long getLong(ContentResolver cr, String name, long def) {
            String valString = getString(cr, name);
            long value;
            try {
                value = valString != null ? Long.parseLong(valString) : def;
            } catch (NumberFormatException e) {
                value = def;
            }
            return value;
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a {@code long}.  Note that internally setting values are always
         * stored as strings; this function converts the string to a {@code long}
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @return The setting's current value.
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not an integer.
         */
        public static long getLong(ContentResolver cr, String name)
                throws SettingNotFoundException {
            String valString = getString(cr, name);
            try {
                return Long.parseLong(valString);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a secure settings value as a long
         * integer. This will either create a new entry in the table if the
         * given name does not exist, or modify the value of the existing row
         * with that name.  Note that internally setting values are always
         * stored as strings, so this function converts the given value to a
         * string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putLong(ContentResolver cr, String name, long value) {
            return putString(cr, name, Long.toString(value));
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a floating point number.  Note that internally setting values are
         * always stored as strings; this function converts the string to an
         * float for you. The default value will be returned if the setting
         * is not defined or not a valid float.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         * @param def Value to return if the setting is not defined.
         *
         * @return The setting's current value, or 'def' if it is not defined
         * or not a valid float.
         */
        public static float getFloat(ContentResolver cr, String name, float def) {
            String v = getString(cr, name);
            try {
                return v != null ? Float.parseFloat(v) : def;
            } catch (NumberFormatException e) {
                return def;
            }
        }

        /**
         * Convenience function for retrieving a single secure settings value
         * as a float.  Note that internally setting values are always
         * stored as strings; this function converts the string to a float
         * for you.
         * <p>
         * This version does not take a default value.  If the setting has not
         * been set, or the string value is not a number,
         * it throws {@link SettingNotFoundException}.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to retrieve.
         *
         * @throws SettingNotFoundException Thrown if a setting by the given
         * name can't be found or the setting value is not a float.
         *
         * @return The setting's current value.
         */
        public static float getFloat(ContentResolver cr, String name)
                throws SettingNotFoundException {
            String v = getString(cr, name);
            if (v == null) {
                throw new SettingNotFoundException(name);
            }
            try {
                return Float.parseFloat(v);
            } catch (NumberFormatException e) {
                throw new SettingNotFoundException(name);
            }
        }

        /**
         * Convenience function for updating a single settings value as a
         * floating point number. This will either create a new entry in the
         * table if the given name does not exist, or modify the value of the
         * existing row with that name.  Note that internally setting values
         * are always stored as strings, so this function converts the given
         * value to a string before storing it.
         *
         * @param cr The ContentResolver to access.
         * @param name The name of the setting to modify.
         * @param value The new value for the setting.
         * @return true if the value was set, false on database errors
         */
        public static boolean putFloat(ContentResolver cr, String name, float value) {
            return putString(cr, name, Float.toString(value));
        }

        /**
          * Subscription to be used for voice call on a multi sim device. The supported values
          * are 0 = SUB1, 1 = SUB2 and etc.
          * @hide
          */
        public static final String MULTI_SIM_VOICE_CALL_SUBSCRIPTION = "multi_sim_voice_call";

        /**
          * Used to provide option to user to select subscription during dial.
          * The supported values are 0 = disable or 1 = enable prompt.
          * @hide
          */
        public static final String MULTI_SIM_VOICE_PROMPT = "multi_sim_voice_prompt";

        /**
          * Subscription to be used for data call on a multi sim device. The supported values
          * are 0 = SUB1, 1 = SUB2 and etc.
          * @hide
          */
        public static final String MULTI_SIM_DATA_CALL_SUBSCRIPTION = "multi_sim_data_call";

        /**
          * Subscription to be used for SMS on a multi sim device. The supported values
          * are 0 = SUB1, 1 = SUB2 and etc.
          * @hide
          */
        public static final String MULTI_SIM_SMS_SUBSCRIPTION = "multi_sim_sms";

       /**
          * Used to provide option to user to select subscription during send SMS.
          * The value 1 - enable, 0 - disable
          * @hide
          */
        public static final String MULTI_SIM_SMS_PROMPT = "multi_sim_sms_prompt";

        /** User preferred subscriptions setting.
          * This holds the details of the user selected subscription from the card and
          * the activation status. Each settings string have the comma separated values
          * iccId,appType,appId,activationStatus,3gppIndex,3gpp2Index
          * @hide
         */
        public static final String[] MULTI_SIM_USER_PREFERRED_SUBS = {"user_preferred_sub1",
                "user_preferred_sub2","user_preferred_sub3"};

        /**
         * Whether to enable new contacts aggregator or not.
         * The value 1 - enable, 0 - disable
         * @hide
         */
        public static final String NEW_CONTACT_AGGREGATOR = "new_contact_aggregator";

        /**
         * Whether to enable contacts metadata syncing or not
         * The value 1 - enable, 0 - disable
         *
         * @removed
         */
        @Deprecated
        public static final String CONTACT_METADATA_SYNC = "contact_metadata_sync";

        /**
         * Whether to enable contacts metadata syncing or not
         * The value 1 - enable, 0 - disable
         */
        public static final String CONTACT_METADATA_SYNC_ENABLED = "contact_metadata_sync_enabled";

        /**
         * Whether to enable cellular on boot.
         * The value 1 - enable, 0 - disable
         * @hide
         */
        public static final String ENABLE_CELLULAR_ON_BOOT = "enable_cellular_on_boot";

        /**
         * The maximum allowed notification enqueue rate in Hertz.
         *
         * Should be a float, and includes updates only.
         * @hide
         */
        public static final String MAX_NOTIFICATION_ENQUEUE_RATE = "max_notification_enqueue_rate";

        /**
         * Displays toasts when an app posts a notification that does not specify a valid channel.
         *
         * The value 1 - enable, 0 - disable
         * @hide
         */
        public static final String SHOW_NOTIFICATION_CHANNEL_WARNINGS =
                "show_notification_channel_warnings";

        /**
         * Whether cell is enabled/disabled
         * @hide
         */
        public static final String CELL_ON = "cell_on";

        /**
         * Global settings which can be accessed by instant apps.
         * @hide
         */
        public static final Set<String> INSTANT_APP_SETTINGS = new ArraySet<>();
        static {
            INSTANT_APP_SETTINGS.add(WAIT_FOR_DEBUGGER);
            INSTANT_APP_SETTINGS.add(DEVICE_PROVISIONED);
            INSTANT_APP_SETTINGS.add(DEVELOPMENT_FORCE_RESIZABLE_ACTIVITIES);
            INSTANT_APP_SETTINGS.add(DEVELOPMENT_FORCE_RTL);
            INSTANT_APP_SETTINGS.add(EPHEMERAL_COOKIE_MAX_SIZE_BYTES);
            INSTANT_APP_SETTINGS.add(AIRPLANE_MODE_ON);
            INSTANT_APP_SETTINGS.add(WINDOW_ANIMATION_SCALE);
            INSTANT_APP_SETTINGS.add(TRANSITION_ANIMATION_SCALE);
            INSTANT_APP_SETTINGS.add(ANIMATOR_DURATION_SCALE);
            INSTANT_APP_SETTINGS.add(DEBUG_VIEW_ATTRIBUTES);
            INSTANT_APP_SETTINGS.add(WTF_IS_FATAL);
            INSTANT_APP_SETTINGS.add(SEND_ACTION_APP_ERROR);
            INSTANT_APP_SETTINGS.add(ZEN_MODE);
        }

        /**
         * Whether to show the high temperature warning notification.
         * @hide
         */
        public static final String SHOW_TEMPERATURE_WARNING = "show_temperature_warning";

        /**
         * Temperature at which the high temperature warning notification should be shown.
         * @hide
         */
        public static final String WARNING_TEMPERATURE = "warning_temperature";

        /**
         * Whether the diskstats logging task is enabled/disabled.
         * @hide
         */
        public static final String ENABLE_DISKSTATS_LOGGING = "enable_diskstats_logging";

        /**
         * Whether the cache quota calculation task is enabled/disabled.
         * @hide
         */
        public static final String ENABLE_CACHE_QUOTA_CALCULATION =
                "enable_cache_quota_calculation";

        /**
         * Whether the Deletion Helper no threshold toggle is available.
         * @hide
         */
        public static final String ENABLE_DELETION_HELPER_NO_THRESHOLD_TOGGLE =
                "enable_deletion_helper_no_threshold_toggle";

        /**
         * The list of snooze options for notifications
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "default=60,options_array=15:30:60:120"
         *
         * The following keys are supported:
         *
         * <pre>
         * default               (int)
         * options_array         (int[])
         * </pre>
         *
         * All delays in integer minutes. Array order is respected.
         * Options will be used in order up to the maximum allowed by the UI.
         * @hide
         */
        public static final String NOTIFICATION_SNOOZE_OPTIONS =
                "notification_snooze_options";

        /**
         * Configuration flags for SQLite Compatibility WAL. Encoded as a key-value list, separated
         * by commas. E.g.: compatibility_wal_supported=true, wal_syncmode=OFF
         *
         * Supported keys:
         * compatibility_wal_supported      (boolean)
         * wal_syncmode       (String)
         *
         * @hide
         */
        public static final String SQLITE_COMPATIBILITY_WAL_FLAGS =
                "sqlite_compatibility_wal_flags";

        /**
         * Enable GNSS Raw Measurements Full Tracking?
         * 0 = no
         * 1 = yes
         * @hide
         */
        public static final String ENABLE_GNSS_RAW_MEAS_FULL_TRACKING =
                "enable_gnss_raw_meas_full_tracking";

        /**
         * Whether the notification should be ongoing (persistent) when a carrier app install is
         * required.
         *
         * The value is a boolean (1 or 0).
         * @hide
         */
        @SystemApi
        public static final String INSTALL_CARRIER_APP_NOTIFICATION_PERSISTENT =
                "install_carrier_app_notification_persistent";

        /**
         * The amount of time (ms) to hide the install carrier app notification after the user has
         * ignored it. After this time passes, the notification will be shown again
         *
         * The value is a long
         * @hide
         */
        @SystemApi
        public static final String INSTALL_CARRIER_APP_NOTIFICATION_SLEEP_MILLIS =
                "install_carrier_app_notification_sleep_millis";

        /**
         * Whether we've enabled zram on this device. Takes effect on
         * reboot. The value "1" enables zram; "0" disables it, and
         * everything else is unspecified.
         * @hide
         */
        public static final String ZRAM_ENABLED =
                "zram_enabled";

        /**
         * Whether we have enable CPU frequency scaling for this device.
         * For Wear, default is disable.
         *
         * The value is "1" for enable, "0" for disable.
         * @hide
         */
        public static final String CPU_SCALING_ENABLED =
                "cpu_frequency_scaling_enabled";

        /**
         * Configuration flags for smart replies in notifications.
         * This is encoded as a key=value list, separated by commas. Ex:
         *
         * "enabled=1,max_squeeze_remeasure_count=3"
         *
         * The following keys are supported:
         *
         * <pre>
         * enabled                         (boolean)
         * requires_targeting_p            (boolean)
         * max_squeeze_remeasure_attempts  (int)
         * </pre>
         * @see com.android.systemui.statusbar.policy.SmartReplyConstants
         * @hide
         */
        public static final String SMART_REPLIES_IN_NOTIFICATIONS_FLAGS =
                "smart_replies_in_notifications_flags";

        /**
         * If nonzero, crashes in foreground processes will bring up a dialog.
         * Otherwise, the process will be silently killed.
         * @hide
         */
        public static final String SHOW_FIRST_CRASH_DIALOG = "show_first_crash_dialog";

        /**
         * If nonzero, crash dialogs will show an option to restart the app.
         * @hide
         */
        public static final String SHOW_RESTART_IN_CRASH_DIALOG = "show_restart_in_crash_dialog";

        /**
         * If nonzero, crash dialogs will show an option to mute all future crash dialogs for
         * this app.
         * @hide
         */
        public static final String SHOW_MUTE_IN_CRASH_DIALOG = "show_mute_in_crash_dialog";

        /**
         * If nonzero, will show the zen upgrade notification when the user toggles DND on/off.
         * @hide
         */
        public static final String SHOW_ZEN_UPGRADE_NOTIFICATION = "show_zen_upgrade_notification";

        /**
         * Backup and restore agent timeout parameters.
         * These parameters are represented by a comma-delimited key-value list.
         *
         * The following strings are supported as keys:
         * <pre>
         *     kv_backup_agent_timeout_millis         (long)
         *     full_backup_agent_timeout_millis       (long)
         *     shared_backup_agent_timeout_millis     (long)
         *     restore_agent_timeout_millis           (long)
         *     restore_agent_finished_timeout_millis  (long)
         * </pre>
         *
         * They map to milliseconds represented as longs.
         *
         * Ex: "kv_backup_agent_timeout_millis=30000,full_backup_agent_timeout_millis=300000"
         *
         * @hide
         */
        public static final String BACKUP_AGENT_TIMEOUT_PARAMETERS =
                "backup_agent_timeout_parameters";

        /**
         * Whether we have enabled swapping on this device. For Wear, default is
         * enabled.
         *
         * The value is "1" for enable, "0" for disable.
         * @hide
         */
         public static final String SWAP_ENABLED = "swap_enabled";

    }

    /**
     * User-defined bookmarks and shortcuts.  The target of each bookmark is an
     * Intent URL, allowing it to be either a web page or a particular
     * application activity.
     *
     * @hide
     */
    public static final class Bookmarks implements BaseColumns
    {
        private static final String TAG = "Bookmarks";

        /**
         * The content:// style URL for this table
         */
        public static final Uri CONTENT_URI =
            Uri.parse("content://" + AUTHORITY + "/bookmarks");

        /**
         * The row ID.
         * <p>Type: INTEGER</p>
         */
        public static final String ID = "_id";

        /**
         * Descriptive name of the bookmark that can be displayed to the user.
         * If this is empty, the title should be resolved at display time (use
         * {@link #getTitle(Context, Cursor)} any time you want to display the
         * title of a bookmark.)
         * <P>
         * Type: TEXT
         * </P>
         */
        public static final String TITLE = "title";

        /**
         * Arbitrary string (displayed to the user) that allows bookmarks to be
         * organized into categories.  There are some special names for
         * standard folders, which all start with '@'.  The label displayed for
         * the folder changes with the locale (via {@link #getLabelForFolder}) but
         * the folder name does not change so you can consistently query for
         * the folder regardless of the current locale.
         *
         * <P>Type: TEXT</P>
         *
         */
        public static final String FOLDER = "folder";

        /**
         * The Intent URL of the bookmark, describing what it points to.  This
         * value is given to {@link android.content.Intent#getIntent} to create
         * an Intent that can be launched.
         * <P>Type: TEXT</P>
         */
        public static final String INTENT = "intent";

        /**
         * Optional shortcut character associated with this bookmark.
         * <P>Type: INTEGER</P>
         */
        public static final String SHORTCUT = "shortcut";

        /**
         * The order in which the bookmark should be displayed
         * <P>Type: INTEGER</P>
         */
        public static final String ORDERING = "ordering";

        private static final String[] sIntentProjection = { INTENT };
        private static final String[] sShortcutProjection = { ID, SHORTCUT };
        private static final String sShortcutSelection = SHORTCUT + "=?";

        /**
         * Convenience function to retrieve the bookmarked Intent for a
         * particular shortcut key.
         *
         * @param cr The ContentResolver to query.
         * @param shortcut The shortcut key.
         *
         * @return Intent The bookmarked URL, or null if there is no bookmark
         *         matching the given shortcut.
         */
        public static Intent getIntentForShortcut(ContentResolver cr, char shortcut)
        {
            Intent intent = null;

            Cursor c = cr.query(CONTENT_URI,
                    sIntentProjection, sShortcutSelection,
                    new String[] { String.valueOf((int) shortcut) }, ORDERING);
            // Keep trying until we find a valid shortcut
            try {
                while (intent == null && c.moveToNext()) {
                    try {
                        String intentURI = c.getString(c.getColumnIndexOrThrow(INTENT));
                        intent = Intent.parseUri(intentURI, 0);
                    } catch (java.net.URISyntaxException e) {
                        // The stored URL is bad...  ignore it.
                    } catch (IllegalArgumentException e) {
                        // Column not found
                        Log.w(TAG, "Intent column not found", e);
                    }
                }
            } finally {
                if (c != null) c.close();
            }

            return intent;
        }

        /**
         * Add a new bookmark to the system.
         *
         * @param cr The ContentResolver to query.
         * @param intent The desired target of the bookmark.
         * @param title Bookmark title that is shown to the user; null if none
         *            or it should be resolved to the intent's title.
         * @param folder Folder in which to place the bookmark; null if none.
         * @param shortcut Shortcut that will invoke the bookmark; 0 if none. If
         *            this is non-zero and there is an existing bookmark entry
         *            with this same shortcut, then that existing shortcut is
         *            cleared (the bookmark is not removed).
         * @return The unique content URL for the new bookmark entry.
         */
        public static Uri add(ContentResolver cr,
                                           Intent intent,
                                           String title,
                                           String folder,
                                           char shortcut,
                                           int ordering)
        {
            // If a shortcut is supplied, and it is already defined for
            // another bookmark, then remove the old definition.
            if (shortcut != 0) {
                cr.delete(CONTENT_URI, sShortcutSelection,
                        new String[] { String.valueOf((int) shortcut) });
            }

            ContentValues values = new ContentValues();
            if (title != null) values.put(TITLE, title);
            if (folder != null) values.put(FOLDER, folder);
            values.put(INTENT, intent.toUri(0));
            if (shortcut != 0) values.put(SHORTCUT, (int) shortcut);
            values.put(ORDERING, ordering);
            return cr.insert(CONTENT_URI, values);
        }

        /**
         * Return the folder name as it should be displayed to the user.  This
         * takes care of localizing special folders.
         *
         * @param r Resources object for current locale; only need access to
         *          system resources.
         * @param folder The value found in the {@link #FOLDER} column.
         *
         * @return CharSequence The label for this folder that should be shown
         *         to the user.
         */
        public static CharSequence getLabelForFolder(Resources r, String folder) {
            return folder;
        }

        /**
         * Return the title as it should be displayed to the user. This takes
         * care of localizing bookmarks that point to activities.
         *
         * @param context A context.
         * @param cursor A cursor pointing to the row whose title should be
         *        returned. The cursor must contain at least the {@link #TITLE}
         *        and {@link #INTENT} columns.
         * @return A title that is localized and can be displayed to the user,
         *         or the empty string if one could not be found.
         */
        public static CharSequence getTitle(Context context, Cursor cursor) {
            int titleColumn = cursor.getColumnIndex(TITLE);
            int intentColumn = cursor.getColumnIndex(INTENT);
            if (titleColumn == -1 || intentColumn == -1) {
                throw new IllegalArgumentException(
                        "The cursor must contain the TITLE and INTENT columns.");
            }

            String title = cursor.getString(titleColumn);
            if (!TextUtils.isEmpty(title)) {
                return title;
            }

            String intentUri = cursor.getString(intentColumn);
            if (TextUtils.isEmpty(intentUri)) {
                return "";
            }

            Intent intent;
            try {
                intent = Intent.parseUri(intentUri, 0);
            } catch (URISyntaxException e) {
                return "";
            }

            PackageManager packageManager = context.getPackageManager();
            ResolveInfo info = packageManager.resolveActivity(intent, 0);
            return info != null ? info.loadLabel(packageManager) : "";
        }
    }

    /**
     * Returns the device ID that we should use when connecting to the mobile gtalk server.
     * This is a string like "android-0x1242", where the hex string is the Android ID obtained
     * from the GoogleLoginService.
     *
     * @param androidId The Android ID for this device.
     * @return The device ID that should be used when connecting to the mobile gtalk server.
     * @hide
     */
    public static String getGTalkDeviceId(long androidId) {
        return "android-" + Long.toHexString(androidId);
    }

    private static final String[] PM_WRITE_SETTINGS = {
        android.Manifest.permission.WRITE_SETTINGS
    };
    private static final String[] PM_CHANGE_NETWORK_STATE = {
        android.Manifest.permission.CHANGE_NETWORK_STATE,
        android.Manifest.permission.WRITE_SETTINGS
    };
    private static final String[] PM_SYSTEM_ALERT_WINDOW = {
        android.Manifest.permission.SYSTEM_ALERT_WINDOW
    };

    /**
     * Performs a strict and comprehensive check of whether a calling package is allowed to
     * write/modify system settings, as the condition differs for pre-M, M+, and
     * privileged/preinstalled apps. If the provided uid does not match the
     * callingPackage, a negative result will be returned.
     * @hide
     */
    public static boolean isCallingPackageAllowedToWriteSettings(Context context, int uid,
            String callingPackage, boolean throwException) {
        return isCallingPackageAllowedToPerformAppOpsProtectedOperation(context, uid,
                callingPackage, throwException, AppOpsManager.OP_WRITE_SETTINGS,
                PM_WRITE_SETTINGS, false);
    }

    /**
     * Performs a strict and comprehensive check of whether a calling package is allowed to
     * write/modify system settings, as the condition differs for pre-M, M+, and
     * privileged/preinstalled apps. If the provided uid does not match the
     * callingPackage, a negative result will be returned. The caller is expected to have
     * the WRITE_SETTINGS permission declared.
     *
     * Note: if the check is successful, the operation of this app will be updated to the
     * current time.
     * @hide
     */
    public static boolean checkAndNoteWriteSettingsOperation(Context context, int uid,
            String callingPackage, boolean throwException) {
        return isCallingPackageAllowedToPerformAppOpsProtectedOperation(context, uid,
                callingPackage, throwException, AppOpsManager.OP_WRITE_SETTINGS,
                PM_WRITE_SETTINGS, true);
    }

    /**
     * Performs a strict and comprehensive check of whether a calling package is allowed to
     * change the state of network, as the condition differs for pre-M, M+, and
     * privileged/preinstalled apps. The caller is expected to have either the
     * CHANGE_NETWORK_STATE or the WRITE_SETTINGS permission declared. Either of these
     * permissions allow changing network state; WRITE_SETTINGS is a runtime permission and
     * can be revoked, but (except in M, excluding M MRs), CHANGE_NETWORK_STATE is a normal
     * permission and cannot be revoked. See http://b/23597341
     *
     * Note: if the check succeeds because the application holds WRITE_SETTINGS, the operation
     * of this app will be updated to the current time.
     * @hide
     */
    public static boolean checkAndNoteChangeNetworkStateOperation(Context context, int uid,
            String callingPackage, boolean throwException) {
        if (context.checkCallingOrSelfPermission(android.Manifest.permission.CHANGE_NETWORK_STATE)
                == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        return isCallingPackageAllowedToPerformAppOpsProtectedOperation(context, uid,
                callingPackage, throwException, AppOpsManager.OP_WRITE_SETTINGS,
                PM_CHANGE_NETWORK_STATE, true);
    }

    /**
     * Performs a strict and comprehensive check of whether a calling package is allowed to
     * draw on top of other apps, as the conditions differs for pre-M, M+, and
     * privileged/preinstalled apps. If the provided uid does not match the callingPackage,
     * a negative result will be returned.
     * @hide
     */
    public static boolean isCallingPackageAllowedToDrawOverlays(Context context, int uid,
            String callingPackage, boolean throwException) {
        return isCallingPackageAllowedToPerformAppOpsProtectedOperation(context, uid,
                callingPackage, throwException, AppOpsManager.OP_SYSTEM_ALERT_WINDOW,
                PM_SYSTEM_ALERT_WINDOW, false);
    }

    /**
     * Performs a strict and comprehensive check of whether a calling package is allowed to
     * draw on top of other apps, as the conditions differs for pre-M, M+, and
     * privileged/preinstalled apps. If the provided uid does not match the callingPackage,
     * a negative result will be returned.
     *
     * Note: if the check is successful, the operation of this app will be updated to the
     * current time.
     * @hide
     */
    public static boolean checkAndNoteDrawOverlaysOperation(Context context, int uid, String
            callingPackage, boolean throwException) {
        return isCallingPackageAllowedToPerformAppOpsProtectedOperation(context, uid,
                callingPackage, throwException, AppOpsManager.OP_SYSTEM_ALERT_WINDOW,
                PM_SYSTEM_ALERT_WINDOW, true);
    }

    /**
     * Helper method to perform a general and comprehensive check of whether an operation that is
     * protected by appops can be performed by a caller or not. e.g. OP_SYSTEM_ALERT_WINDOW and
     * OP_WRITE_SETTINGS
     * @hide
     */
    public static boolean isCallingPackageAllowedToPerformAppOpsProtectedOperation(Context context,
            int uid, String callingPackage, boolean throwException, int appOpsOpCode, String[]
            permissions, boolean makeNote) {
        if (callingPackage == null) {
            return false;
        }

        AppOpsManager appOpsMgr = (AppOpsManager)context.getSystemService(Context.APP_OPS_SERVICE);
        int mode = AppOpsManager.MODE_DEFAULT;
        if (makeNote) {
            mode = appOpsMgr.noteOpNoThrow(appOpsOpCode, uid, callingPackage);
        } else {
            mode = appOpsMgr.checkOpNoThrow(appOpsOpCode, uid, callingPackage);
        }

        switch (mode) {
            case AppOpsManager.MODE_ALLOWED:
                return true;

            case AppOpsManager.MODE_DEFAULT:
                // this is the default operating mode after an app's installation
                // In this case we will check all associated static permission to see
                // if it is granted during install time.
                for (String permission : permissions) {
                    if (context.checkCallingOrSelfPermission(permission) == PackageManager
                            .PERMISSION_GRANTED) {
                        // if either of the permissions are granted, we will allow it
                        return true;
                    }
                }

            default:
                // this is for all other cases trickled down here...
                if (!throwException) {
                    return false;
                }
        }

        // prepare string to throw SecurityException
        StringBuilder exceptionMessage = new StringBuilder();
        exceptionMessage.append(callingPackage);
        exceptionMessage.append(" was not granted ");
        if (permissions.length > 1) {
            exceptionMessage.append(" either of these permissions: ");
        } else {
            exceptionMessage.append(" this permission: ");
        }
        for (int i = 0; i < permissions.length; i++) {
            exceptionMessage.append(permissions[i]);
            exceptionMessage.append((i == permissions.length - 1) ? "." : ", ");
        }

        throw new SecurityException(exceptionMessage.toString());
    }

    /**
     * Retrieves a correponding package name for a given uid. It will query all
     * packages that are associated with the given uid, but it will return only
     * the zeroth result.
     * Note: If package could not be found, a null is returned.
     * @hide
     */
    public static String getPackageNameForUid(Context context, int uid) {
        String[] packages = context.getPackageManager().getPackagesForUid(uid);
        if (packages == null) {
            return null;
        }
        return packages[0];
    }
}