andriod6.0低功耗模式(关闭wifi、蓝牙、gps、屏幕亮度等)

之前android5.0一篇博客分析过了android低功耗模式，这边我们需要在低功耗模式下新增一些功能，就直接分析代码：

一、新增功能函数位置
在低功耗的最后生效的函数中，增加一个函数，执行我们需要的功能：

void updateLowPowerModeLocked() {
    if (mIsPowered && mLowPowerModeSetting) {
        if (DEBUG_SPEW) {
            Slog.d(TAG, "updateLowPowerModeLocked: powered, turning setting off");
        }
        // Turn setting off if powered
        Settings.Global.putInt(mContext.getContentResolver(),
                Settings.Global.LOW_POWER_MODE, 0);
        mLowPowerModeSetting = false;
    }
    final boolean autoLowPowerModeEnabled = !mIsPowered && mAutoLowPowerModeConfigured
            && !mAutoLowPowerModeSnoozing && mBatteryLevelLow;
    final boolean lowPowerModeEnabled = mLowPowerModeSetting || autoLowPowerModeEnabled;

    if (mLowPowerModeEnabled != lowPowerModeEnabled) {
        mLowPowerModeEnabled = lowPowerModeEnabled;
        powerHintInternal(POWER_HINT_LOW_POWER, lowPowerModeEnabled ? 1 : 0);
        BackgroundThread.getHandler().post(new Runnable() {
            @Override
            public void run() {
                Intent intent = new Intent(PowerManager.ACTION_POWER_SAVE_MODE_CHANGING)//发广播
                        .putExtra(PowerManager.EXTRA_POWER_SAVE_MODE, mLowPowerModeEnabled)
                        .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
                mContext.sendBroadcast(intent);
                ArrayList<PowerManagerInternal.LowPowerModeListener> listeners;
                synchronized (mLock) {
                    listeners = new ArrayList<PowerManagerInternal.LowPowerModeListener>(
                            mLowPowerModeListeners);
                }
                for (int i=0; i<listeners.size(); i++) {
                    listeners.get(i).onLowPowerModeChanged(lowPowerModeEnabled);//各个回调
                }
                intent = new Intent(PowerManager.ACTION_POWER_SAVE_MODE_CHANGED);
                intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
                mContext.sendBroadcast(intent);
                handlePowerSaveMode(mLowPowerModeEnabled);//新增功能函数
            }
        });
    }
}

二、新增函数

一些初始化在systemReady函数中：

public void systemReady(IAppOpsService appOps) {
    synchronized (mLock) {
        mSystemReady = true;
        mAppOps = appOps;
        mDreamManager = getLocalService(DreamManagerInternal.class);
        mDisplayManagerInternal = getLocalService(DisplayManagerInternal.class);
        mPolicy = getLocalService(WindowManagerPolicy.class);
        mBatteryManagerInternal = getLocalService(BatteryManagerInternal.class);

        PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
        mWifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);//wifi
        mTelephonyManager = (TelephonyManager)mContext.getSystemService(Context.TELEPHONY_SERVICE);//数据流量
        mAudioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);//控制震动设置
        BluetoothManager bluetoothManager = (BluetoothManager)mContext.getSystemService(Context.BLUETOOTH_SERVICE);//蓝牙
        mBluetoothAdapter = bluetoothManager.getAdapter();

handlePowerSaveMode函数就是我们主要的功能实现，如下：

private void handlePowerSaveMode(boolean LowPowerMode) {
    final ContentResolver resolver = mContext.getContentResolver();
    if (LowPowerMode) {//低功耗模式
        mNoLowPowerScreenoffTimeout = Settings.System.getIntForUser(resolver,
            Settings.System.SCREEN_OFF_TIMEOUT, DEFAULT_SCREEN_OFF_TIMEOUT,
            UserHandle.USER_CURRENT);//获取之前的屏幕睡眠时间
        mNoLowPowerScreenBrightness = Settings.System.getIntForUser(resolver,
            Settings.System.SCREEN_BRIGHTNESS, mScreenBrightnessSettingDefault,
            UserHandle.USER_CURRENT);//获取之前的屏幕亮度
        mNoLowPowerLocationMode = Settings.Secure.getIntForUser(resolver,
            Settings.Secure.LOCATION_MODE, Settings.Secure.LOCATION_MODE_OFF,
            UserHandle.USER_CURRENT);//获取之前定位状态
        mNoLowPowerWifiApState = mWifiManager.getWifiApState();//wifi热点状态
        mNoLowPowerWifiState = mWifiManager.getWifiState();//wifi状态
        mNoLowPowerDataEnabled = mTelephonyManager.getDataEnabled();//数据流量状态
        mNoLowPowerBluetoothEnabled = mBluetoothAdapter.isEnabled();//蓝牙状态
        mNoLowPowerVibrateRingerSetting = mAudioManager.getVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER);//铃声震动
        mNoLowPowerVibrateNotificationSetting= mAudioManager.getVibrateSetting(AudioManager.VIBRATE_TYPE_NOTIFICATION);//通知震动
        Settings.System.putInt(resolver, Settings.System.SCREEN_OFF_TIMEOUT, 15000);//设置屏幕睡眠时间15秒
        Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, 10);//设置屏幕亮度为10
        Settings.Secure.putInt(resolver, Settings.Secure.LOCATION_MODE, Settings.Secure.LOCATION_MODE_OFF);//关闭定位

        mWifiManager.setWifiApEnabled(null, false);//关闭wifi热点
        mWifiManager.setWifiEnabled(false);//关闭wifi
        mTelephonyManager.setDataEnabled(false);//关闭数据流量
        mBluetoothAdapter.disable();//关闭蓝牙
        mAudioManager.setVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER, AudioManager.VIBRATE_SETTING_OFF);//关闭铃声震动
        mAudioManager.setVibrateSetting(AudioManager.VIBRATE_TYPE_NOTIFICATION, AudioManager.VIBRATE_SETTING_OFF);//关闭通知震动
    } else {//这边是低功耗模式关闭后，一系列的恢复动作
        Settings.System.putInt(resolver, Settings.System.SCREEN_OFF_TIMEOUT, mNoLowPowerScreenoffTimeout);
        Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, mNoLowPowerScreenBrightness);
        Settings.Secure.putInt(resolver, Settings.Secure.LOCATION_MODE, mNoLowPowerLocationMode);

        mAudioManager.setVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER, mNoLowPowerVibrateRingerSetting);
        mAudioManager.setVibrateSetting(AudioManager.VIBRATE_TYPE_NOTIFICATION, mNoLowPowerVibrateNotificationSetting);
        if (mNoLowPowerWifiApState == WifiManager.WIFI_AP_STATE_ENABLED) {
            mWifiManager.setWifiApEnabled(null, true);
        }
        if (mNoLowPowerWifiState == WifiManager.WIFI_STATE_ENABLED) {
            mWifiManager.setWifiEnabled(true);
        }
        mTelephonyManager.setDataEnabled(mNoLowPowerDataEnabled);
        if (mNoLowPowerBluetoothEnabled) {
            mBluetoothAdapter.enable();
        }
    }
}

这里好多都使用了Settings里面的数据库，是因为好多设置都是监听这个数据库，比如PowermanagerService会监听亮度，睡眠时间。而settings应用进入也是根据这个settings的数据库设置选项的
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原文链接：https://blog.csdn.net/kc58236582/article/details/50843954