android 7.0 Settings 省电模式

Settings 省电模式:
开启省电方式有两种:
第一种自动开启,点击Turn on automatically,弹出下拉选项,选择never, at 5% battery, at 15% battery
第二种手动开启,点击SwitchBar开关即可设置
先说第一种:

关键字段:

/packages/apps/Settings/res/values/strings.xml<!-- [CHAR_LIMIT=40] Battery saver: Title for automatic entry option --><string name="battery_saver_turn_on_automatically_title">Turn on automatically</string>

对应布局:
/packages/apps/Settings/res/xml/battery_saver_settings.xml

控件:<DropDownPreferenceandroid:key="turn_on_automatically"android:title="@string/battery_saver_turn_on_automatically_title"android:summary="%s" />
使用类:
/packages/apps/Settings/src/com/android/settings/fuelgauge/BatterySaverSettings.java

@Overridepublic void onActivityCreated(Bundle savedInstanceState) {super.onActivityCreated(savedInstanceState);if (mCreated) {mSwitchBar.show();return;}mCreated = true;addPreferencesFromResource(R.xml.battery_saver_settings);mContext = getActivity();mSwitchBar = ((SettingsActivity) mContext).getSwitchBar();mSwitch = mSwitchBar.getSwitch();mSwitchBar.show();//SettingPref 帮助管理绑定到全局或系统设置的双状态或下拉式首选项, 这里使用下拉选项mTriggerPref = new SettingPref(SettingPref.TYPE_GLOBAL, KEY_TURN_ON_AUTOMATICALLY,Global.LOW_POWER_MODE_TRIGGER_LEVEL,0, /*default*/getResources().getIntArray(R.array.battery_saver_trigger_values)) { //设置下拉子选项 共3个 (0 5 15)@Overrideprotected String getCaption(Resources res, int value) {if (value > 0 && value < 100) {return res.getString(R.string.battery_saver_turn_on_automatically_pct,Utils.formatPercentage(value));}return res.getString(R.string.battery_saver_turn_on_automatically_never); //never选项 默认值}};mTriggerPref.init(this); //初始化 mDropDown.setEntries(entries); mDropDown.setEntryValues(values) , 设置点击事件mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);}/**type    存放类型 两种: global 和 systemkey     控件的keysetting Settings数据存放的键def     DropDownPreference 的默认值values  DropDownPreference 的下拉选项集合
*/
public SettingPref(int type, String key, String setting, int def, int... values) {mType = type;mKey = key;mSetting = setting;mDefault = def;mValues = values;mUri = getUriFor(mType, mSetting);}

在 mTriggerPref.init(this) 方法中设置了DropDownPreference的点击事件

      if (mDropDown != null && p != null) {p.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {@Overridepublic boolean onPreferenceChange(Preference preference, Object newValue) {//当下拉选项改变时,将当前选项的值存入Settings数据库其实就是存如入setting_global.xml key值是Global.LOW_POWER_MODE_TRIGGER_LEVELreturn setSetting(context, Integer.parseInt((String) newValue));}});return mDropDown;}

当Settings数据库中Global.LOW_POWER_MODE_TRIGGER_LEVEL改变时,在PowerManagerService中做了监听:

/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.javapublic void systemReady(IAppOpsService appOps) {resolver.registerContentObserver(Settings.Global.getUriFor(Settings.Global.LOW_POWER_MODE),false, mSettingsObserver, UserHandle.USER_ALL);//注册Global.LOW_POWER_MODE_TRIGGER_LEVEL数据改变监听resolver.registerContentObserver(Settings.Global.getUriFor(Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL),false, mSettingsObserver, UserHandle.USER_ALL);}private final class SettingsObserver extends ContentObserver {public SettingsObserver(Handler handler) {super(handler);}@Overridepublic void onChange(boolean selfChange, Uri uri) {synchronized (mLock) {handleSettingsChangedLocked(); //更新省电模式}}}private void handleSettingsChangedLocked() {updateSettingsLocked();updatePowerStateLocked();}

updateSettingsLocked 和 updatePowerStateLocked 方法中做了一些状态的判断,最后都会调用:
updateLowPowerModeLocked(); //此方法是最终功能实现的地方.

再说第二种:
SwitchBar 开关的监听事件:
使用类:

/packages/apps/Settings/src/com/android/settings/fuelgauge/BatterySaverSettings.java
public void onResume(){mSwitchBar.addOnSwitchChangeListener(this); //注册
}public void onPause() {mSwitchBar.removeOnSwitchChangeListener(this); //删除
}

监听事件的处理:

@Overridepublic void onSwitchChanged(Switch switchView, boolean isChecked) {mHandler.removeCallbacks(mStartMode);if (isChecked) {mHandler.postDelayed(mStartMode, WAIT_FOR_SWITCH_ANIM); //开启省电模式  mStartMode是一个Runnable} else {if (DEBUG) Log.d(TAG, "Stopping low power mode from settings");trySetPowerSaveMode(false);}}

最后调用:

private void trySetPowerSaveMode(boolean mode) {if (!mPowerManager.setPowerSaveMode(mode)) { //PowerManager 实际调用的是PowerManagerService的方法if (DEBUG) Log.d(TAG, "Setting mode failed, fallback to current value");mHandler.post(mUpdateSwitch);}// TODO: Remove once broadcast is in place.ConditionManager.get(getContext()).getCondition(BatterySaverCondition.class).refreshState();}

实际调用: PowerManagerService --> setPowerSaveMode()
PowerManagerService.java

@Override // Binder callpublic boolean setPowerSaveMode(boolean mode) {mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DEVICE_POWER, null);final long ident = Binder.clearCallingIdentity();try {return setLowPowerModeInternal(mode); } finally {Binder.restoreCallingIdentity(ident);}}private boolean setLowPowerModeInternal(boolean mode) {synchronized (mLock) {if (DEBUG) Slog.d(TAG, "setLowPowerModeInternal " + mode + " mIsPowered=" + mIsPowered);if (mIsPowered) {return false;}Settings.Global.putInt(mContext.getContentResolver(),Settings.Global.LOW_POWER_MODE, mode ? 1 : 0);  //将开关状态存入数据库mLowPowerModeSetting = mode;if (mAutoLowPowerModeConfigured && mBatteryLevelLow) {if (mode && mAutoLowPowerModeSnoozing) {if (DEBUG_SPEW) {Slog.d(TAG, "setLowPowerModeInternal: clearing low power mode snooze");}mAutoLowPowerModeSnoozing = false;} else if (!mode && !mAutoLowPowerModeSnoozing) {if (DEBUG_SPEW) {Slog.d(TAG, "setLowPowerModeInternal: snoozing low power mode");}mAutoLowPowerModeSnoozing = true;}}updateLowPowerModeLocked(); //更新状态return true;}}

最后说一下updateLowPowerModeLocked()方法:

//此方法返回true，表示省电模式设置成功
private void updateLowPowerModeLocked() {if ((mIsPowered || !mBatteryLevelLow && !mBootCompleted) && mLowPowerModeSetting) {if (DEBUG_SPEW) {Slog.d(TAG, "updateLowPowerModeLocked: powered or booting with sufficient battery,"+ " turning setting off");}// Turn setting off if poweredSettings.Global.putInt(mContext.getContentResolver(),Settings.Global.LOW_POWER_MODE, 0);mLowPowerModeSetting = false;}/** mIsPowered 变量表示充电状态，true表示正在充电（已接入电源），否则为falsemLowPowerModeSetting 变量（表示设置低电模式的当前状态；从系统设置中获取的值，即数据库字段“low_power”的值）mAutoLowPowerModeConfigured 自动开启省电模式的当前状态，即数据库字段“low_power_trigger_level”是否为0的值；不为0时表示打开了自动开
启功能，该变量为truemAutoLowPowerModeSnoozing 当电量低并且允许自动设置省电模式时，如果此时省电模式是开启的，就要设置mAutoLowPowerModeSnoozing的值为
false；如果省电模式是关闭的，就要设置mAutoLowPowerModeSnoozing的值为true。就是要求
mAutoLowPowerModeSnoozing变量与省电模式的逻辑保持一致。mBatteryLevelLow  如果电池电量低为true,否则为falsemBatteryLevelLowValue 当前自动开启省电模式的电量百分比,就是前面DropDownPreference中设置的values值,0(never) 5% 15% */final boolean autoLowPowerModeEnabled = !mIsPowered && mAutoLowPowerModeConfigured&& !mAutoLowPowerModeSnoozing && mBatteryLevelLow &&(mBatteryManagerInternal.getBatteryLevel() <= mBatteryLevelLowValue);final boolean lowPowerModeEnabled = mLowPowerModeSetting || autoLowPowerModeEnabled;if (mLowPowerModeEnabled != lowPowerModeEnabled) {mLowPowerModeEnabled = lowPowerModeEnabled;powerHintInternal(POWER_HINT_LOW_POWER, lowPowerModeEnabled ? 1 : 0);postAfterBootCompleted(new Runnable() {@Overridepublic void run() {//发送处理广播 ACTION_POWER_SAVE_MODE_CHANGINGIntent intent = new Intent(PowerManager.ACTION_POWER_SAVE_MODE_CHANGING).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);}//发送ACTION_POWER_SAVE_MODE_CHANGED广播，更新省电模式状态intent = new Intent(PowerManager.ACTION_POWER_SAVE_MODE_CHANGED);intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);mContext.sendBroadcast(intent);// Send internal version that requires signature permission.mContext.sendBroadcastAsUser(new Intent(PowerManager.ACTION_POWER_SAVE_MODE_CHANGED_INTERNAL), UserHandle.ALL,Manifest.permission.DEVICE_POWER);}});}}

"ACTION_POWER_SAVE_MODE_CHANGING" 广播的接收类:
/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/policy/BatteryControllerImpl.java
/frameworks/base/packages/SystemUI/src/com/android/systemui/power/PowerUI.java

"ACTION_POWER_SAVE_MODE_CHANGED" 广播的接收类:
/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/policy/BatteryControllerImpl.java
/frameworks/base/packages/SystemUI/src/com/android/systemui/power/PowerUI.java
/frameworks/base/services/voiceinteraction/java/com/android/server/soundtrigger/SoundTriggerHelper.java
/frameworks/base/services/core/java/com/android/server/location/GnssLocationProvider.java
在对应的BroadcastReceiver中处理相关逻辑,比如: 降低屏幕亮度关闭GPS功能关闭语音识别等.

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