/* * 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 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", "true"); } /** * 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. 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 getAllFeatureFlags() { return DEFAULT_FLAGS; } }