| /* |
| * Copyright (C) 2017 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.util; |
| |
| import android.content.Context; |
| import android.os.SystemProperties; |
| import android.provider.Settings; |
| import android.text.TextUtils; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Util class to get feature flag information. |
| * |
| * @hide |
| */ |
| public class FeatureFlagUtils { |
| |
| public static final String FFLAG_PREFIX = "sys.fflag."; |
| public static final String FFLAG_OVERRIDE_PREFIX = FFLAG_PREFIX + "override."; |
| |
| private static final Map<String, String> DEFAULT_FLAGS; |
| static { |
| DEFAULT_FLAGS = new HashMap<>(); |
| DEFAULT_FLAGS.put("settings_battery_display_app_list", "false"); |
| DEFAULT_FLAGS.put("settings_zone_picker_v2", "true"); |
| DEFAULT_FLAGS.put("settings_about_phone_v2", "true"); |
| DEFAULT_FLAGS.put("settings_bluetooth_while_driving", "false"); |
| DEFAULT_FLAGS.put("settings_data_usage_v2", "true"); |
| DEFAULT_FLAGS.put("settings_audio_switcher", "true"); |
| DEFAULT_FLAGS.put("settings_systemui_theme", "false"); |
| } |
| |
| /** |
| * Whether or not a flag is enabled. |
| * |
| * @param feature the flag name |
| * @return true if the flag is enabled (either by default in system, or override by user) |
| */ |
| public static boolean isEnabled(Context context, String feature) { |
| // Override precedence: |
| // Settings.Global -> sys.fflag.override.* -> static list |
| |
| // Step 1: check if feature flag is set in Settings.Global. |
| String value; |
| if (context != null) { |
| value = Settings.Global.getString(context.getContentResolver(), feature); |
| if (!TextUtils.isEmpty(value)) { |
| return Boolean.parseBoolean(value); |
| } |
| } |
| |
| // Step 2: check if feature flag has any override. Flag name: sys.fflag.override.<feature> |
| value = SystemProperties.get(FFLAG_OVERRIDE_PREFIX + feature); |
| if (!TextUtils.isEmpty(value)) { |
| return Boolean.parseBoolean(value); |
| } |
| // Step 3: check if feature flag has any default value. |
| value = getAllFeatureFlags().get(feature); |
| return Boolean.parseBoolean(value); |
| } |
| |
| /** |
| * Override feature flag to new state. |
| */ |
| public static void setEnabled(Context context, String feature, boolean enabled) { |
| SystemProperties.set(FFLAG_OVERRIDE_PREFIX + feature, enabled ? "true" : "false"); |
| } |
| |
| /** |
| * Returns all feature flags in their raw form. |
| */ |
| public static Map<String, String> getAllFeatureFlags() { |
| return DEFAULT_FLAGS; |
| } |
| } |