core/java/android/provider/Settings.java

/*
 * 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 com.google.android.collect.Maps;

import org.apache.commons.codec.binary.Base64;

import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.content.ContentQueryMap;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
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.net.Uri;
import android.os.*;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.AndroidException;
import android.util.Log;

import java.net.URISyntaxException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.HashSet;


/**
 * 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 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 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 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 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 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 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 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_INPUT_METHOD_SETTINGS =
            "android.settings.INPUT_METHOD_SETTINGS";

    /**
     * Activity Action: Show settings to manage the user input dictionary.
     * <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_USER_DICTIONARY_SETTINGS =
            "android.settings.USER_DICTIONARY_SETTINGS";

    /**
     * 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.
     * <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_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 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 to allow configuration of sync 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_SYNC_SETTINGS =
            "android.settings.SYNC_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>
     * 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";

    // End of Intent actions for Settings

    private static final String JID_RESOURCE_PREFIX = "android";

    public static final String AUTHORITY = "settings";

    private static final String TAG = "Settings";

    private static String sJidResource = null;

    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.e(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 class NameValueCache {
        private final String mVersionSystemProperty;
        private final HashMap<String, String> mValues = Maps.newHashMap();
        private long mValuesVersion = 0;
        private final Uri mUri;

        NameValueCache(String versionSystemProperty, Uri uri) {
            mVersionSystemProperty = versionSystemProperty;
            mUri = uri;
        }

        String getString(ContentResolver cr, String name) {
            long newValuesVersion = SystemProperties.getLong(mVersionSystemProperty, 0);
            if (mValuesVersion != newValuesVersion) {
                mValues.clear();
                mValuesVersion = newValuesVersion;
            }
            if (!mValues.containsKey(name)) {
                String value = null;
                Cursor c = null;
                try {
                    c = cr.query(mUri, new String[] { Settings.NameValueTable.VALUE },
                            Settings.NameValueTable.NAME + "=?", new String[]{name}, null);
                    if (c != null && c.moveToNext()) value = c.getString(0);
                    mValues.put(name, value);
                } catch (SQLException e) {
                    // SQL error: return null, but don't cache it.
                    Log.e(TAG, "Can't get key " + name + " from " + mUri, e);
                } finally {
                    if (c != null) c.close();
                }
                return value;
            } else {
                return mValues.get(name);
            }
        }
    }

    /**
     * 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 {
        public static final String SYS_PROP_SETTING_VERSION = "sys.settings_system_version";

        private static volatile NameValueCache mNameValueCache = null;

        private static final HashSet<String> MOVED_TO_SECURE;
        static {
            MOVED_TO_SECURE = new HashSet<String>(30);
            MOVED_TO_SECURE.add(Secure.ADB_ENABLED);
            MOVED_TO_SECURE.add(Secure.ANDROID_ID);
            MOVED_TO_SECURE.add(Secure.BLUETOOTH_ON);
            MOVED_TO_SECURE.add(Secure.DATA_ROAMING);
            MOVED_TO_SECURE.add(Secure.DEVICE_PROVISIONED);
            MOVED_TO_SECURE.add(Secure.HTTP_PROXY);
            MOVED_TO_SECURE.add(Secure.INSTALL_NON_MARKET_APPS);
            MOVED_TO_SECURE.add(Secure.LOCATION_PROVIDERS_ALLOWED);
            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.USB_MASS_STORAGE_ENABLED);
            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);
        }

        /**
         * 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 synchronized static String getString(ContentResolver resolver, 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 read-only value.");
                return Secure.getString(resolver, name);
            }
            if (mNameValueCache == null) {
                mNameValueCache = new NameValueCache(SYS_PROP_SETTING_VERSION, CONTENT_URI);
            }
            return mNameValueCache.getString(resolver, name);
        }

        /**
         * 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) {
            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;
            }
            return putString(resolver, CONTENT_URI, name, value);
        }

        /**
         * 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);
            }
            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) {
            String v = getString(cr, name);
            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 {
            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 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) {
            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 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 {
            String valString = getString(cr, name);
            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 putString(cr, name, Long.toString(value));
        }

        /**
         * 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) {
            String v = getString(cr, name);
            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 {
            String v = getString(cr, 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));
        }

        /**
         * 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) {
            outConfig.fontScale = Settings.System.getFloat(
                cr, FONT_SCALE, outConfig.fontScale);
            if (outConfig.fontScale < 0) {
                outConfig.fontScale = 1;
            }
        }

        /**
         * 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 Settings.System.putFloat(cr, FONT_SCALE, config.fontScale);
        }

        public static boolean getShowGTalkServiceStatus(ContentResolver cr) {
            return getInt(cr, SHOW_GTALK_SERVICE_STATUS, 0) != 0;
        }

        public static void setShowGTalkServiceStatus(ContentResolver cr, boolean flag) {
            putInt(cr, SHOW_GTALK_SERVICE_STATUS, flag ? 1 : 0);
        }

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

        /**
         * 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>
         * </ul>
         * These values can be OR-ed together.
         */
        public static final String STAY_ON_WHILE_PLUGGED_IN = "stay_on_while_plugged_in";

        /**
         * 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";

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

        /**
         * Constant for use in AIRPLANE_MODE_RADIOS to specify Cellular radio.
         */
        public static final String RADIO_CELL = "cell";

        /**
         * 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";

        /**
         * 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;

        /**
         * Whether to use static IP and other static network attributes.
         * <p>
         * Set to 1 for true and 0 for false.
         */
        public static final String WIFI_USE_STATIC_IP = "wifi_use_static_ip";

        /**
         * The static IP address.
         * <p>
         * Example: "192.168.1.51"
         */
        public static final String WIFI_STATIC_IP = "wifi_static_ip";

        /**
         * If using static IP, the gateway's IP address.
         * <p>
         * Example: "192.168.1.1"
         */
        public static final String WIFI_STATIC_GATEWAY = "wifi_static_gateway";

        /**
         * If using static IP, the net mask.
         * <p>
         * Example: "255.255.255.0"
         */
        public static final String WIFI_STATIC_NETMASK = "wifi_static_netmask";

        /**
         * If using static IP, the primary DNS's IP address.
         * <p>
         * Example: "192.168.1.1"
         */
        public static final String WIFI_STATIC_DNS1 = "wifi_static_dns1";

        /**
         * If using static IP, the secondary DNS's IP address.
         * <p>
         * Example: "192.168.1.2"
         */
        public static final String WIFI_STATIC_DNS2 = "wifi_static_dns2";

        /**
         * The number of radio channels that are allowed in the local
         * 802.11 regulatory domain.
         * @hide
         */
        public static final String WIFI_NUM_ALLOWED_CHANNELS = "wifi_num_allowed_channels";

        /**
         * 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";

        /**
         * 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";

        /**
         * Whether autolock is enabled (0 = false, 1 = true)
         */
        public static final String LOCK_PATTERN_ENABLED = "lock_pattern_autolock";

        /**
         * Whether lock pattern is visible as user enters (0 = false, 1 = true)
         */
        public static final String LOCK_PATTERN_VISIBLE = "lock_pattern_visible_pattern";

        /**
         * Whether lock pattern will vibrate as user enters (0 = false, 1 = true)
         */
        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.
         */
        public static final String NEXT_ALARM_FORMATTED = "next_alarm_formatted";

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

        /**
         * 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";

        /**
         * Whether or not to dim the screen. 0=no  1=yes
         */
        public static final String DIM_SCREEN = "dim_screen";

        /**
         * The timeout before the screen turns off.
         */
        public static final String SCREEN_OFF_TIMEOUT = "screen_off_timeout";

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

        /**
         * Control whether the process CPU usage meter should be shown.
         */
        public static final String SHOW_PROCESSES = "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.
         */
        public static final String ALWAYS_FINISH_ACTIVITIES =
                "always_finish_activities";


        /**
         * 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";

        /**
         * Determines which streams are affected by ringer 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";

         /**
          * 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";

        /**
         * 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";

        /**
         * Ringer volume. This is used internally, changing this value will not
         * change the volume. See AudioManager.
         */
        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.
         */
        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.
         */
        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.
         */
        public static final String VOLUME_MUSIC = "volume_music";

        /**
         * Alarm volume. This is used internally, changing this
         * value will not change the volume. See AudioManager.
         */
        public static final String VOLUME_ALARM = "volume_alarm";

        /**
         * Notification volume. This is used internally, changing this
         * value will not change the volume. See AudioManager.
         */
        public static final String VOLUME_NOTIFICATION = "volume_notification";

        /**
         * 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
         */
        public static final String NOTIFICATIONS_USE_RING_VOLUME =
            "notifications_use_ring_volume";

        /**
         * The mapping of stream type (integer) to its setting.
         */
        public static final String[] VOLUME_SETTINGS = {
            VOLUME_VOICE, VOLUME_SYSTEM, VOLUME_RING, VOLUME_MUSIC,
            VOLUME_ALARM, VOLUME_NOTIFICATION
        };

        /**
         * Appended to various volume related settings to record the previous
         * values before they the settings were affected by a silent/vibrate
         * ringer mode change.
         */
        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";

        /**
         * 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);

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

        /**
         * 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);

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

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

        /**
         * 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";

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

        public static final String SHOW_GTALK_SERVICE_STATUS =
                "SHOW_GTALK_SERVICE_STATUS";

        /**
         * Name of activity to use for wallpaper on the home screen.
         */
        public static final String WALLPAPER_ACTIVITY = "wallpaper_activity";

        /**
         * 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";

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

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

        /**
         * 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";

        /**
         * 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 normal window animations. Setting to 0 will disable window
         * animations.
         * @hide
         */
        public static final String FANCY_IME_ANIMATIONS = "fancy_ime_animations";

        /**
         * 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";

        /**
         * 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";

        /**
         * 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";

        /**
         * Whether the haptic feedback (long presses, ...) are enabled. The value is
         * boolean (1 or 0).
         */
        public static final String HAPTIC_FEEDBACK_ENABLED = "haptic_feedback_enabled";

        // Settings moved to Settings.Secure

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

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

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

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

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

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

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

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

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

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

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

    /**
     * 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 {
        public static final String SYS_PROP_SETTING_VERSION = "sys.settings_secure_version";

        private static volatile NameValueCache mNameValueCache = null;

        /**
         * 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 synchronized static String getString(ContentResolver resolver, String name) {
            if (mNameValueCache == null) {
                mNameValueCache = new NameValueCache(SYS_PROP_SETTING_VERSION, CONTENT_URI);
            }
            return mNameValueCache.getString(resolver, name);
        }

        /**
         * 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 putString(resolver, CONTENT_URI, name, value);
        }

        /**
         * 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);
            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));
        }

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

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

        /**
         * The Android ID (a unique 64-bit value) as a hex string.
         * Identical to that obtained by calling
         * GoogleLoginService.getAndroidId(); it is also placed here
         * so you can get it without binding to a service.
         */
        public static final String ANDROID_ID = "android_id";

        /**
         * Whether bluetooth is enabled/disabled
         * 0=disabled. 1=enabled.
         */
        public static final String BLUETOOTH_ON = "bluetooth_on";

        /**
         * Get the key that retrieves a bluetooth headset's priority.
         * @hide
         */
        public static final String getBluetoothHeadsetPriorityKey(String address) {
            return ("bluetooth_headset_priority_" + address.toUpperCase());
        }

        /**
         * Get the key that retrieves a bluetooth a2dp sink's priority.
         * @hide
         */
        public static final String getBluetoothA2dpSinkPriorityKey(String address) {
            return ("bluetooth_a2dp_sink_priority_" + address.toUpperCase());
        }

        /**
         * Whether or not data roaming is enabled. (0 = false, 1 = true)
         */
        public static final String DATA_ROAMING = "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";

        /**
         * Whether the device has been provisioned (0 = false, 1 = true)
         */
        public static final String DEVICE_PROVISIONED = "device_provisioned";

        /**
         * List of input methods that are currently enabled.  This is a string
         * containing the IDs of all enabled input methods, each ID separated
         * by ':'.
         */
        public static final String ENABLED_INPUT_METHODS = "enabled_input_methods";

        /**
         * Host name and port for a user-selected proxy.
         */
        public static final String HTTP_PROXY = "http_proxy";

        /**
         * Whether the package installer should allow installation of apps downloaded from
         * sources other than the Android Market (vending machine).
         *
         * 1 = allow installing from other sources
         * 0 = only allow installing from the Android Market
         */
        public static final String INSTALL_NON_MARKET_APPS = "install_non_market_apps";

        /**
         * Comma-separated list of location providers that activities may access.
         */
        public static final String LOCATION_PROVIDERS_ALLOWED = "location_providers_allowed";

        /**
         * 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";

        /**
         * The Logging ID (a unique 64-bit value) as a hex string.
         * Used as a pseudonymous identifier for logging.
         * @hide
         */
        public static final String LOGGING_ID2 = "logging_id2";

        /**
         * User preference for which network(s) should be used. Only the
         * connectivity service should touch this.
         */
        public static final String NETWORK_PREFERENCE = "network_preference";

        /**
         */
        public static final String PARENTAL_CONTROL_ENABLED = "parental_control_enabled";

        /**
         */
        public static final String PARENTAL_CONTROL_LAST_UPDATE = "parental_control_last_update";

        /**
         */
        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";

        /**
         * USB Mass Storage Enabled
         */
        public static final String USB_MASS_STORAGE_ENABLED = "usb_mass_storage_enabled";

        /**
         * 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";

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

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

        /**
         * 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.
         */
        public static final String WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON =
                "wifi_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";

        /**
         * The number of radio channels that are allowed in the local
         * 802.11 regulatory domain.
         * @hide
         */
        public static final String WIFI_NUM_ALLOWED_CHANNELS = "wifi_num_allowed_channels";

        /**
         * 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";

        /**
         * Whether the Wi-Fi should be on.  Only the Wi-Fi service should touch this.
         */
        public static final String WIFI_ON = "wifi_on";

        /**
         * The acceptable packet loss percentage (range 0 - 100) before trying
         * another AP on the same network.
         */
        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.
         */
        public static final String WIFI_WATCHDOG_AP_COUNT = "wifi_watchdog_ap_count";

        /**
         * The delay between background checks.
         */
        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.
         */
        public static final String WIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED =
                "wifi_watchdog_background_check_enabled";

        /**
         * The timeout for a background ping
         */
        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.
         */
        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.
         */
        public static final String WIFI_WATCHDOG_MAX_AP_CHECKS = "wifi_watchdog_max_ap_checks";

        /**
         * Whether the Wi-Fi watchdog is enabled.
         */
        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.
         */
        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.
         */
        public static final String WIFI_WATCHDOG_PING_COUNT = "wifi_watchdog_ping_count";

        /**
         * The delay between pings.
         */
        public static final String WIFI_WATCHDOG_PING_DELAY_MS = "wifi_watchdog_ping_delay_ms";

        /**
         * The timeout per ping.
         */
        public static final String WIFI_WATCHDOG_PING_TIMEOUT_MS = "wifi_watchdog_ping_timeout_ms";

        /**
         * 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";

        /**
         * Whether background data usage is allowed by the user. See
         * ConnectivityManager for more info.
         */
        public static final String BACKGROUND_DATA = "background_data";

        /**
         * 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 preferred network mode   7 = Global
         *                              6 = EvDo only
         *                              5 = CDMA w/o EvDo
         *                              4 = CDMA / EvDo auto
         *                              3 = GSM / WCDMA auto
         *                              2 = WCDMA only
         *                              1 = GSM only
         *                              0 = GSM / WCDMA preferred
         * @hide
         */
        public static final String PREFERRED_NETWORK_MODE =
                "preferred_network_mode";

        /**
         * 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";


        /**
         * 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 subscription 0 = Subscription from RUIM, when available
         *                       1 = Subscription from NV
         * @hide
         */
        public static final String PREFERRED_CDMA_SUBSCRIPTION =
                "preferred_cdma_subscription";

        /**
         * 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";

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

        /**
         * 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
         *
         * @hide
         */
        public static final boolean isLocationProviderEnabled(ContentResolver cr, String provider) {
            String allowedProviders = Settings.Secure.getString(cr, LOCATION_PROVIDERS_ALLOWED);
            if (allowedProviders != null) {
                return (allowedProviders.equals(provider) ||
                        allowedProviders.contains("," + provider + ",") ||
                        allowedProviders.startsWith(provider + ",") ||
                        allowedProviders.endsWith("," + provider));
            }
            return false;
        }

        /**
         * 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
         *
         * @hide
         */
        public static final void setLocationProviderEnabled(ContentResolver cr,
                String provider, boolean enabled) {
            // 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;
            }
            putString(cr, Settings.Secure.LOCATION_PROVIDERS_ALLOWED, provider);
        }
    }

    /**
     * Gservices settings, containing the network names for Google's
     * various services. This table holds simple name/addr pairs.
     * Addresses can be accessed through the getString() method.
     *
     * TODO: This should move to partner/google/... somewhere.
     *
     * @hide
     */
    public static final class Gservices extends NameValueTable {
        public static final String SYS_PROP_SETTING_VERSION = "sys.settings_gservices_version";

        /**
         * Intent action broadcast when the Gservices table is updated by the server.
         * This is broadcast once after settings change (so many values may have been updated).
         */
        @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
        public static final String CHANGED_ACTION =
            "com.google.gservices.intent.action.GSERVICES_CHANGED";

        /**
         * Intent action to override Gservices for testing.  (Requires WRITE_GSERVICES permission.)
         */
        @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
        public static final String OVERRIDE_ACTION =
            "com.google.gservices.intent.action.GSERVICES_OVERRIDE";

        private static volatile NameValueCache mNameValueCache = null;
        private static final Object mNameValueCacheLock = new Object();

        /**
         * 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) {
            synchronized (mNameValueCacheLock) {
                if (mNameValueCache == null) {
                    mNameValueCache = new NameValueCache(SYS_PROP_SETTING_VERSION, CONTENT_URI);
                }
                return mNameValueCache.getString(resolver, name);
            }
        }

        /**
         * 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 putString(resolver, CONTENT_URI, name, value);
        }

        /**
         * Look up the value for name in the database, convert it to an int using Integer.parseInt
         * and return it. If it is null or if a NumberFormatException is caught during the
         * conversion then return defValue.
         */
        public static int getInt(ContentResolver resolver, String name, int defValue) {
            String valString = getString(resolver, name);
            int value;
            try {
                value = valString != null ? Integer.parseInt(valString) : defValue;
            } catch (NumberFormatException e) {
                value = defValue;
            }
            return value;
        }

        /**
         * Look up the value for name in the database, convert it to a long using Long.parseLong
         * and return it. If it is null or if a NumberFormatException is caught during the
         * conversion then return defValue.
         */
        public static long getLong(ContentResolver resolver, String name, long defValue) {
            String valString = getString(resolver, name);
            long value;
            try {
                value = valString != null ? Long.parseLong(valString) : defValue;
            } catch (NumberFormatException e) {
                value = defValue;
            }
            return value;
        }

        /**
         * 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);
        }

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

        /**
         * MMS - URL to use for HTTP "x-wap-profile" header
         */
        public static final String MMS_X_WAP_PROFILE_URL
                = "mms_x_wap_profile_url";

        /**
         * YouTube - the flag to indicate whether to use proxy
         */
        public static final String YOUTUBE_USE_PROXY
                = "youtube_use_proxy";

        /**
         * MMS - maximum message size in bytes for a MMS message.
         */
        public static final String MMS_MAXIMUM_MESSAGE_SIZE
                = "mms_maximum_message_size";

        /**
         * Event tags from the kernel event log to upload during checkin.
         */
        public static final String CHECKIN_EVENTS = "checkin_events";

        /**
         * Event tags for list of services to upload during checkin.
         */
        public static final String CHECKIN_DUMPSYS_LIST = "checkin_dumpsys_list";

        /**
         * The interval (in seconds) between periodic checkin attempts.
         */
        public static final String CHECKIN_INTERVAL = "checkin_interval";

        /**
         * Boolean indicating if the market app should force market only checkins on
         * install/uninstall. Any non-0 value is considered true.
         */
        public static final String MARKET_FORCE_CHECKIN = "market_force_checkin";

        /**
         * How frequently (in seconds) to check the memory status of the
         * device.
         */
        public static final String MEMCHECK_INTERVAL = "memcheck_interval";

        /**
         * Max frequency (in seconds) to log memory check stats, in realtime
         * seconds.  This allows for throttling of logs when the device is
         * running for large amounts of time.
         */
        public static final String MEMCHECK_LOG_REALTIME_INTERVAL =
                "memcheck_log_realtime_interval";

        /**
         * Boolean indicating whether rebooting due to system memory checks
         * is enabled.
         */
        public static final String MEMCHECK_SYSTEM_ENABLED = "memcheck_system_enabled";

        /**
         * How many bytes the system process must be below to avoid scheduling
         * a soft reboot.  This reboot will happen when it is next determined
         * to be a good time.
         */
        public static final String MEMCHECK_SYSTEM_SOFT_THRESHOLD = "memcheck_system_soft";

        /**
         * How many bytes the system process must be below to avoid scheduling
         * a hard reboot.  This reboot will happen immediately.
         */
        public static final String MEMCHECK_SYSTEM_HARD_THRESHOLD = "memcheck_system_hard";

        /**
         * How many bytes the phone process must be below to avoid scheduling
         * a soft restart.  This restart will happen when it is next determined
         * to be a good time.
         */
        public static final String MEMCHECK_PHONE_SOFT_THRESHOLD = "memcheck_phone_soft";

        /**
         * How many bytes the phone process must be below to avoid scheduling
         * a hard restart.  This restart will happen immediately.
         */
        public static final String MEMCHECK_PHONE_HARD_THRESHOLD = "memcheck_phone_hard";

        /**
         * Boolean indicating whether restarting the phone process due to
         * memory checks is enabled.
         */
        public static final String MEMCHECK_PHONE_ENABLED = "memcheck_phone_enabled";

        /**
         * First time during the day it is okay to kill processes
         * or reboot the device due to low memory situations.  This number is
         * in seconds since midnight.
         */
        public static final String MEMCHECK_EXEC_START_TIME = "memcheck_exec_start_time";

        /**
         * Last time during the day it is okay to kill processes
         * or reboot the device due to low memory situations.  This number is
         * in seconds since midnight.
         */
        public static final String MEMCHECK_EXEC_END_TIME = "memcheck_exec_end_time";

        /**
         * How long the screen must have been off in order to kill processes
         * or reboot.  This number is in seconds.  A value of -1 means to
         * entirely disregard whether the screen is on.
         */
        public static final String MEMCHECK_MIN_SCREEN_OFF = "memcheck_min_screen_off";

        /**
         * How much time there must be until the next alarm in order to kill processes
         * or reboot.  This number is in seconds.  Note: this value must be
         * smaller than {@link #MEMCHECK_RECHECK_INTERVAL} or else it will
         * always see an alarm scheduled within its time.
         */
        public static final String MEMCHECK_MIN_ALARM = "memcheck_min_alarm";

        /**
         * How frequently to check whether it is a good time to restart things,
         * if the device is in a bad state.  This number is in seconds.  Note:
         * this value must be larger than {@link #MEMCHECK_MIN_ALARM} or else
         * the alarm to schedule the recheck will always appear within the
         * minimum "do not execute now" time.
         */
        public static final String MEMCHECK_RECHECK_INTERVAL = "memcheck_recheck_interval";

        /**
         * How frequently (in DAYS) to reboot the device.  If 0, no reboots
         * will occur.
         */
        public static final String REBOOT_INTERVAL = "reboot_interval";

        /**
         * First time during the day it is okay to force a reboot of the
         * device (if REBOOT_INTERVAL is set).  This number is
         * in seconds since midnight.
         */
        public static final String REBOOT_START_TIME = "reboot_start_time";

        /**
         * The window of time (in seconds) after each REBOOT_INTERVAL in which
         * a reboot can be executed.  If 0, a reboot will always be executed at
         * exactly the given time.  Otherwise, it will only be executed if
         * the device is idle within the window.
         */
        public static final String REBOOT_WINDOW = "reboot_window";

        /**
         * The minimum version of the server that is required in order for the device to accept
         * the server's recommendations about the initial sync settings to use. When this is unset,
         * blank or can't be interpreted as an integer then we will not ask the server for a
         * recommendation.
         */
        public static final String GMAIL_CONFIG_INFO_MIN_SERVER_VERSION =
                "gmail_config_info_min_server_version";

        /**
         * Controls whether Gmail offers a preview button for images.
         */
        public static final String GMAIL_DISALLOW_IMAGE_PREVIEWS = "gmail_disallow_image_previews";

        /**
         * The maximal size in bytes allowed for attachments when composing messages in Gmail
         */
        public static final String GMAIL_MAX_ATTACHMENT_SIZE = "gmail_max_attachment_size_bytes";

        /**
         * The timeout in milliseconds that Gmail uses when opening a connection and reading
         * from it. A missing value or a value of -1 instructs Gmail to use the defaults provided
         * by GoogleHttpClient.
         */
        public static final String GMAIL_TIMEOUT_MS = "gmail_timeout_ms";

        /**
         * Controls whether Gmail will request an expedited sync when a message is sent. Value must
         * be an integer where non-zero means true. Defaults to 1.
         */
        public static final String GMAIL_SEND_IMMEDIATELY = "gmail_send_immediately";

        /**
         * Controls whether gmail buffers server responses.  Possible values are "memory", for a
         * memory-based buffer, or "file", for a temp-file-based buffer.  All other values
         * (including not set) disable buffering.
         */
        public static final String GMAIL_BUFFER_SERVER_RESPONSE = "gmail_buffer_server_response";

        /**
         * Controls whether Gmail will discard uphill operations that repeatedly fail. Value must be
         * an integer where non-zero means true. Defaults to 1.
         */
        public static final String GMAIL_DISCARD_ERROR_UPHILL_OP = "gmail_discard_error_uphill_op";

        /**
         * Hostname of the GTalk server.
         */
        public static final String GTALK_SERVICE_HOSTNAME = "gtalk_hostname";

        /**
         * Secure port of the GTalk server.
         */
        public static final String GTALK_SERVICE_SECURE_PORT = "gtalk_secure_port";

        /**
         * The server configurable RMQ acking interval
         */
        public static final String GTALK_SERVICE_RMQ_ACK_INTERVAL = "gtalk_rmq_ack_interval";

        /**
         * The minimum reconnect delay for short network outages or when the network is suspended
         * due to phone use.
         */
        public static final String GTALK_SERVICE_MIN_RECONNECT_DELAY_SHORT =
                "gtalk_min_reconnect_delay_short";

        /**
         * The reconnect variant range for short network outages or when the network is suspended
         * due to phone use. A random number between 0 and this constant is computed and
         * added to {@link #GTALK_SERVICE_MIN_RECONNECT_DELAY_SHORT} to form the initial reconnect
         * delay.
         */
        public static final String GTALK_SERVICE_RECONNECT_VARIANT_SHORT =
                "gtalk_reconnect_variant_short";

        /**
         * The minimum reconnect delay for long network outages
         */
        public static final String GTALK_SERVICE_MIN_RECONNECT_DELAY_LONG =
                "gtalk_min_reconnect_delay_long";

        /**
         * The reconnect variant range for long network outages.  A random number between 0 and this
         * constant is computed and added to {@link #GTALK_SERVICE_MIN_RECONNECT_DELAY_LONG} to
         * form the initial reconnect delay.
         */
        public static final String GTALK_SERVICE_RECONNECT_VARIANT_LONG =
                "gtalk_reconnect_variant_long";

        /**
         * The maximum reconnect delay time, in milliseconds.
         */
        public static final String GTALK_SERVICE_MAX_RECONNECT_DELAY =
                "gtalk_max_reconnect_delay";

        /**
         * The network downtime that is considered "short" for the above calculations,
         * in milliseconds.
         */
        public static final String GTALK_SERVICE_SHORT_NETWORK_DOWNTIME =
                "gtalk_short_network_downtime";

        /**
         * How frequently we send heartbeat pings to the GTalk server. Receiving a server packet
         * will reset the heartbeat timer. The away heartbeat should be used when the user is
         * logged into the GTalk app, but not actively using it.
         */
        public static final String GTALK_SERVICE_AWAY_HEARTBEAT_INTERVAL_MS =
                "gtalk_heartbeat_ping_interval_ms";  // keep the string backward compatible

        /**
         * How frequently we send heartbeat pings to the GTalk server. Receiving a server packet
         * will reset the heartbeat timer. The active heartbeat should be used when the user is
         * actively using the GTalk app.
         */
        public static final String GTALK_SERVICE_ACTIVE_HEARTBEAT_INTERVAL_MS =
                "gtalk_active_heartbeat_ping_interval_ms";

        /**
         * How frequently we send heartbeat pings to the GTalk server. Receiving a server packet
         * will reset the heartbeat timer. The sync heartbeat should be used when the user isn't
         * logged into the GTalk app, but auto-sync is enabled.
         */
        public static final String GTALK_SERVICE_SYNC_HEARTBEAT_INTERVAL_MS =
                "gtalk_sync_heartbeat_ping_interval_ms";

        /**
         * How frequently we send heartbeat pings to the GTalk server. Receiving a server packet
         * will reset the heartbeat timer. The no sync heartbeat should be used when the user isn't
         * logged into the GTalk app, and auto-sync is not enabled.
         */
        public static final String GTALK_SERVICE_NOSYNC_HEARTBEAT_INTERVAL_MS =
                "gtalk_nosync_heartbeat_ping_interval_ms";

        /**
         * How long we wait to receive a heartbeat ping acknowledgement (or another packet)
         * from the GTalk server, before deeming the connection dead.
         */
        public static final String GTALK_SERVICE_HEARTBEAT_ACK_TIMEOUT_MS =
                "gtalk_heartbeat_ack_timeout_ms";

        /**
         * How long after screen is turned off before we consider the user to be idle.
         */
        public static final String GTALK_SERVICE_IDLE_TIMEOUT_MS =
                "gtalk_idle_timeout_ms";

        /**
         * By default, GTalkService will always connect to the server regardless of the auto-sync
         * setting. However, if this parameter is true, then GTalkService will only connect
         * if auto-sync is enabled. Using the GTalk app will trigger the connection too.
         */
        public static final String GTALK_SERVICE_CONNECT_ON_AUTO_SYNC =
                "gtalk_connect_on_auto_sync";

        /**
         * GTalkService holds a wakelock while broadcasting the intent for data message received.
         * It then automatically release the wakelock after a timeout. This setting controls what
         * the timeout should be.
         */
        public static final String GTALK_DATA_MESSAGE_WAKELOCK_MS =
                "gtalk_data_message_wakelock_ms";

        /**
         * The socket read timeout used to control how long ssl handshake wait for reads before
         * timing out. This is needed so the ssl handshake doesn't hang for a long time in some
         * circumstances.
         */
        public static final String GTALK_SSL_HANDSHAKE_TIMEOUT_MS =
                "gtalk_ssl_handshake_timeout_ms";

        /**
         * Compress the gtalk stream.
         */
        public static final String GTALK_COMPRESS = "gtalk_compress";

        /**
         * This is the timeout for which Google Talk will send the message using bareJID. In a
         * established chat between two XMPP endpoints, Google Talk uses fullJID in the format
         * of user@domain/resource in order to send the message to the specific client. However,
         * if Google Talk hasn't received a message from that client after some time, it would
         * fall back to use the bareJID, which would broadcast the message to all clients for
         * the other user.
         */
        public static final String GTALK_USE_BARE_JID_TIMEOUT_MS = "gtalk_use_barejid_timeout_ms";

        /**
         * Enable use of ssl session caching.
         * 'db' - save each session in a (per process) database
         * 'file' - save each session in a (per process) file
         * not set or any other value - normal java in-memory caching
         */
        public static final String SSL_SESSION_CACHE = "ssl_session_cache";

        /**
         * How many bytes long a message has to be, in order to be gzipped.
         */
        public static final String SYNC_MIN_GZIP_BYTES =
                "sync_min_gzip_bytes";

        /**
         * The hash value of the current provisioning settings
         */
        public static final String PROVISIONING_DIGEST = "digest";

        /**
         * Provisioning keys to block from server update
         */
        public static final String PROVISIONING_OVERRIDE = "override";

        /**
         * "Generic" service name for  authentication requests.
         */
        public static final String GOOGLE_LOGIN_GENERIC_AUTH_SERVICE
                = "google_login_generic_auth_service";

        /**
         * Frequency in milliseconds at which we should sync the locally installed Vending Machine
         * content with the server.
         */
        public static final String VENDING_SYNC_FREQUENCY_MS = "vending_sync_frequency_ms";

        /**
         * Support URL that is opened in a browser when user clicks on 'Help and Info' in Vending
         * Machine.
         */
        public static final String VENDING_SUPPORT_URL = "vending_support_url";

        /**
         * Indicates if Vending Machine requires a SIM to be in the phone to allow a purchase.
         *
         * true = SIM is required
         * false = SIM is not required
         */
        public static final String VENDING_REQUIRE_SIM_FOR_PURCHASE =
                "vending_require_sim_for_purchase";

        /**
         * The current version id of the Vending Machine terms of service.
         */
        public static final String VENDING_TOS_VERSION = "vending_tos_version";

        /**
         * URL that points to the terms of service for Vending Machine.
         */
        public static final String VENDING_TOS_URL = "vending_tos_url";

        /**
         * Whether to use sierraqa instead of sierra tokens for the purchase flow in
         * Vending Machine.
         *
         * true = use sierraqa
         * false = use sierra (default)
         */
        public static final String VENDING_USE_CHECKOUT_QA_SERVICE =
                "vending_use_checkout_qa_service";

        /**
         * Default value to use for all/free/priced filter in Market.
         * Valid values: ALL, FREE, PAID (case insensitive)
         */
        public static final String VENDING_DEFAULT_FILTER = "vending_default_filter";
        /**
         * Ranking type value to use for the first category tab (currently popular)
         */
        public static final String VENDING_TAB_1_RANKING_TYPE = "vending_tab_1_ranking_type";

        /**
         * Title string to use for first category tab.
         */
        public static final String VENDING_TAB_1_TITLE = "vending_tab_1_title";

        /**
         * Ranking type value to use for the second category tab (currently newest)
         */
        public static final String VENDING_TAB_2_RANKING_TYPE = "vending_tab_2_ranking_type";

        /**
         * Title string to use for second category tab.
         */
        public static final String VENDING_TAB_2_TITLE = "vending_tab_2_title";

        /**
         * URL that points to the legal terms of service to display in Settings.
         * <p>
         * This should be a https URL. For a pretty user-friendly URL, use
         * {@link #SETTINGS_TOS_PRETTY_URL}.
         */
        public static final String SETTINGS_TOS_URL = "settings_tos_url";

        /**
         * URL that points to the legal terms of service to display in Settings.
         * <p>
         * This should be a pretty http URL. For the URL the device will access
         * via Settings, use {@link #SETTINGS_TOS_URL}.
         */
        public static final String SETTINGS_TOS_PRETTY_URL = "settings_tos_pretty_url";

        /**
         * URL that points to the contributors to display in Settings.
         * <p>
         * This should be a https URL. For a pretty user-friendly URL, use
         * {@link #SETTINGS_CONTRIBUTORS_PRETTY_URL}.
         */
        public static final String SETTINGS_CONTRIBUTORS_URL = "settings_contributors_url";

        /**
         * URL that points to the contributors to display in Settings.
         * <p>
         * This should be a pretty http URL. For the URL the device will access
         * via Settings, use {@link #SETTINGS_CONTRIBUTORS_URL}.
         */
        public static final String SETTINGS_CONTRIBUTORS_PRETTY_URL =
                "settings_contributors_pretty_url";

        /**
         * URL that points to the Terms Of Service for the device.
         * <p>
         * This should be a pretty http URL.
         */
        public static final String SETUP_GOOGLE_TOS_URL = "setup_google_tos_url";

        /**
         * URL that points to the Android privacy policy for the device.
         * <p>
         * This should be a pretty http URL.
         */
        public static final String SETUP_ANDROID_PRIVACY_URL = "setup_android_privacy_url";

        /**
         * URL that points to the Google privacy policy for the device.
         * <p>
         * This should be a pretty http URL.
         */
        public static final String SETUP_GOOGLE_PRIVACY_URL = "setup_google_privacy_url";

        /**
         * Request an MSISDN token for various Google services.
         */
        public static final String USE_MSISDN_TOKEN = "use_msisdn_token";

        /**
         * RSA public key used to encrypt passwords stored in the database.
         */
        public static final String GLS_PUBLIC_KEY = "google_login_public_key";

        /**
         * Only check parental control status if this is set to "true".
         */
        public static final String PARENTAL_CONTROL_CHECK_ENABLED =
                "parental_control_check_enabled";

        /**
         * The list of applications we need to block if parental control is
         * enabled.
         */
        public static final String PARENTAL_CONTROL_APPS_LIST =
                "parental_control_apps_list";

        /**
         * Duration in which parental control status is valid.
         */
        public static final String PARENTAL_CONTROL_TIMEOUT_IN_MS =
                "parental_control_timeout_in_ms";

        /**
         * When parental control is off, we expect to get this string from the
         * litmus url.
         */
        public static final String PARENTAL_CONTROL_EXPECTED_RESPONSE =
                "parental_control_expected_response";

        /**
         * When the litmus url returns a 302, declare parental control to be on
         * only if the redirect url matches this regular expression.
         */
        public static final String PARENTAL_CONTROL_REDIRECT_REGEX =
                "parental_control_redirect_regex";

        /**
         * 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.
         */
        public static final String DISK_FREE_CHANGE_REPORTING_THRESHOLD =
                "disk_free_change_reporting_threshold";

        /**
         * Prefix for new Google services published by the checkin
         * server.
         */
        public static final String GOOGLE_SERVICES_PREFIX
                = "google_services:";

        /**
         * The maximum reconnect delay for short network outages or when the network is suspended
         * due to phone use.
         */
        public static final String SYNC_MAX_RETRY_DELAY_IN_SECONDS =
                "sync_max_retry_delay_in_seconds";

        /**
         * Minimum percentage of free storage on the device that is used to determine if
         * the device is running low on storage.
         * 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.
         */
        public static final String SYS_STORAGE_THRESHOLD_PERCENTAGE =
                "sys_storage_threshold_percentage";

        /**
         * The interval in minutes after which the amount of free storage left on the
         * device is logged to the event log
         */
        public static final String SYS_FREE_STORAGE_LOG_INTERVAL =
                "sys_free_storage_log_interval";

        /**
         * 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.
         */
        public static final String SMS_OUTGOING_CEHCK_INTERVAL_MS =
                "sms_outgoing_check_interval_ms";

        /**
         * The number of outgoing SMS sent without asking for user permit
         * (of {@link #SMS_OUTGOING_CEHCK_INTERVAL_MS}
         */
        public static final String SMS_OUTGOING_CEHCK_MAX_COUNT =
                "sms_outgoing_check_max_count";

        /**
         * 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.
         */
        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.
         */
        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.
         */
        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
         */
        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.
         */
        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.
         */
        public static final String PDP_WATCHDOG_MAX_PDP_RESET_FAIL_COUNT =
                "pdp_watchdog_max_pdp_reset_fail_count";

        /**
         * Address to ping as a last sanity check before attempting any recovery.
         * Unset or set to "0.0.0.0" to skip this check.
         */
        public static final String PDP_WATCHDOG_PING_ADDRESS = "pdp_watchdog_ping_address";

        /**
         * The "-w deadline" parameter for the ping, ie, the max time in
         * seconds to spend pinging.
         */
        public static final String PDP_WATCHDOG_PING_DEADLINE = "pdp_watchdog_ping_deadline";

        /**
         * 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.
         *
         */
        public static final String GPRS_REGISTER_CHECK_PERIOD_MS =
                "gprs_register_check_period_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.
         */
        public static final String WIFI_IDLE_MS = "wifi_idle_ms";

        /**
         * Screen timeout in milliseconds corresponding to the
         * PowerManager's POKE_LOCK_SHORT_TIMEOUT flag (i.e. the fastest
         * possible screen timeout behavior.)
         */
        public static final String SHORT_KEYLIGHT_DELAY_MS =
                "short_keylight_delay_ms";

        /**
         * URL that points to the voice search servers. To be factored out of this class.
         */
        public static final String VOICE_SEARCH_URL = "voice_search_url";

        /**
         * Speech encoding used with voice search on 3G networks. To be factored out of this class.
         */
        public static final String VOICE_SEARCH_ENCODING_THREE_G = "voice_search_encoding_three_g";

        /**
         * Speech encoding used with voice search on WIFI networks. To be factored out of this class.
         */
        public static final String VOICE_SEARCH_ENCODING_WIFI = "voice_search_encoding_wifi";

        /**
         * Whether to use automatic gain control in voice search (0 = disable, 1 = enable).
         * To be factored out of this class.
         */
        public static final String VOICE_SEARCH_ENABLE_AGC = "voice_search_enable_agc";

        /**
         * Whether to use noise suppression in voice search (0 = disable, 1 = enable).
         * To be factored out of this class.
         */
        public static final String VOICE_SEARCH_ENABLE_NS = "voice_search_enable_ns";

        /**
         * Whether to use the IIR filter in voice search (0 = disable, 1 = enable).
         * To be factored out of this class.
         */
        public static final String VOICE_SEARCH_ENABLE_IIR = "voice_search_enable_iir";

        /**
         * List of test suites (local disk filename) for the automatic instrumentation test runner.
         * The file format is similar to automated_suites.xml, see AutoTesterService.
         * If this setting is missing or empty, the automatic test runner will not start.
         */
        public static final String AUTOTEST_SUITES_FILE = "autotest_suites_file";

        /**
         * Interval between synchronous checkins forced by the automatic test runner.
         * If you set this to a value smaller than CHECKIN_INTERVAL, then the test runner's
         * frequent checkins will prevent asynchronous background checkins from interfering
         * with any performance measurements.
         */
        public static final String AUTOTEST_CHECKIN_SECONDS = "autotest_checkin_seconds";

        /**
         * Interval between reboots forced by the automatic test runner.
         */
        public static final String AUTOTEST_REBOOT_SECONDS = "autotest_reboot_seconds";


        /**
         * Threshold values for the duration and level of a discharge cycle, under
         * which we log discharge cycle info.
         */
        public static final String BATTERY_DISCHARGE_DURATION_THRESHOLD =
                "battery_discharge_duration_threshold";
        public static final String BATTERY_DISCHARGE_THRESHOLD = "battery_discharge_threshold";

        /**
         * An email address that anr bugreports should be sent to.
         */
        public static final String ANR_BUGREPORT_RECIPIENT = "anr_bugreport_recipient";

        /**
         * @deprecated
         * @hide
         */
        @Deprecated  // Obviated by NameValueCache: just fetch the value directly.
        public static class QueryMap extends ContentQueryMap {

            public QueryMap(ContentResolver contentResolver, Cursor cursor, boolean keepUpdated,
                    Handler handlerForUpdateNotifications) {
                super(cursor, NAME, keepUpdated, handlerForUpdateNotifications);
            }

            public QueryMap(ContentResolver contentResolver, boolean keepUpdated,
                    Handler handlerForUpdateNotifications) {
                this(contentResolver,
                        contentResolver.query(CONTENT_URI, null, null, null, null),
                        keepUpdated, handlerForUpdateNotifications);
            }

            public String getString(String name) {
                ContentValues cv = getValues(name);
                if (cv == null) return null;
                return cv.getAsString(VALUE);
            }
        }

    }

    /**
     * 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.getIntent(intentURI);
                    } catch (java.net.URISyntaxException e) {
                        // The stored URL is bad...  ignore it.
                    } catch (IllegalArgumentException e) {
                        // Column not found
                        Log.e(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) {
                Cursor c = cr.query(CONTENT_URI,
                        sShortcutProjection, sShortcutSelection,
                        new String[] { String.valueOf((int) shortcut) }, null);
                try {
                    if (c.moveToFirst()) {
                        while (c.getCount() > 0) {
                            if (!c.deleteRow()) {
                                Log.w(TAG, "Could not delete existing shortcut row");
                            }
                        }
                    }
                } finally {
                    if (c != null) c.close();
                }
            }

            ContentValues values = new ContentValues();
            if (title != null) values.put(TITLE, title);
            if (folder != null) values.put(FOLDER, folder);
            values.put(INTENT, intent.toURI());
            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.getIntent(intentUri);
            } catch (URISyntaxException e) {
                return "";
            }

            PackageManager packageManager = context.getPackageManager();
            ResolveInfo info = packageManager.resolveActivity(intent, 0);
            return info != null ? info.loadLabel(packageManager) : "";
        }
    }

    /**
     * Returns the GTalk JID resource associated with this device.
     *
     * @return  String  the JID resource of the device. It uses the device IMEI in the computation
     * of the JID resource. If IMEI is not ready (i.e. telephony module not ready), we'll return
     * an empty string.
     * @hide
     */
    // TODO: we shouldn't not have a permenant Jid resource, as that's an easy target for
    // spams. We should change it once a while, like when we resubscribe to the subscription feeds
    // server.
    // (also, should this live in GTalkService?)
    public static synchronized String getJidResource() {
        if (sJidResource != null) {
            return sJidResource;
        }

        MessageDigest digest;
        try {
            digest = MessageDigest.getInstance("SHA-1");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("this should never happen");
        }

        String deviceId = TelephonyManager.getDefault().getDeviceId();
        if (TextUtils.isEmpty(deviceId)) {
            return "";
        }

        byte[] hashedDeviceId = digest.digest(deviceId.getBytes());
        String id = new String(Base64.encodeBase64(hashedDeviceId), 0, 12);
        id = id.replaceAll("/", "_");
        sJidResource = JID_RESOURCE_PREFIX + id;
        return sJidResource;
    }

    /**
     * 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);
    }
}