android6.0设置-电池-智能省电

                                              MTK Android6.0设置中的智能省电默认关闭

        对于大多部分的setting中的配置信息，在default.xml文件中都有配置，但是也有一些设置中的配置信息在配置文件中没有的，所以就需要各位在源码中找到代码所处的位置，进行判断分析是否关闭或者打开。所以，就有了今天的博文。

       以下是MTK Android6.0中的源码信息，高通、瑞芯微等源码仅供参考：

1、源码位置：alps\packages\apps\Settings\src\com\mediatek\settings\fuelgauge\PowerUsageExts.java

    // init power usage extends items   按钮初始化的分析
    public void initPowerUsageExtItems() {
        // background power saving
        if (FeatureOption.MTK_BG_POWER_SAVING_SUPPORT
                && FeatureOption.MTK_BG_POWER_SAVING_UI_SUPPORT) {
            mBgPowerSavingPrf = new SwitchPreference(mContext);
            mBgPowerSavingPrf.setKey(KEY_BACKGROUND_POWER_SAVING);
            mBgPowerSavingPrf.setTitle(R.string.bg_power_saving_title);
            mBgPowerSavingPrf.setOrder(PREFERENCE_ORDER_FIRST);
            mBgPowerSavingPrf.setChecked(Settings.System.getInt(mContext.getContentResolver(),
                    Settings.System.BG_POWER_SAVING_ENABLE, 0) != 1);  //modified BG_POWER_SAVING_ENABLE Off by default 
            mPowerUsageScreen.addPreference(mBgPowerSavingPrf);
        }
    }
 
    // on click  待机智能省电小按钮的响应事件
    public boolean onPowerUsageExtItemsClick(PreferenceScreen preferenceScreen,
            Preference preference) {
        if (KEY_BACKGROUND_POWER_SAVING.equals(preference.getKey())) {
            if (preference instanceof SwitchPreference) {
                SwitchPreference pref = (SwitchPreference) preference;
                int bgState = pref.isChecked() ? 1 : 0;
                Log.d(TAG, "background power saving state: " + bgState);
                Settings.System.putInt(mContext.getContentResolver(),
                        Settings.System.BG_POWER_SAVING_ENABLE, bgState);
                if (mBgPowerSavingPrf != null) {
                    mBgPowerSavingPrf.setChecked(pref.isChecked());
                }
            }
            // If user click on PowerSaving preference just return here
            return true;
        }
        return false;
    }

       到此，Settings中的电池->待机智能省电就可以自行改写了。

2、由于最近碰机器灭屏断网的问题，经过APP以及系统调试判断时智能待机省电打开的原因。但是，在这个问题上我是默认把待机智能省电关闭的了，并且经过测试部门测试某些特定功能也是通过的，怎么还是打开的呢？于是再次跟踪源码分析了一下，上面对于某些软件来说可能只是UI层面的显示关闭，并没有真正的关闭智能省电。特此纠正一下上面分析流程和总结结果：

首先，在以前的分析代码中，initPowerUsageExtItems()这个初始化方法，是在刚开机的时候设置UI开关按钮的状态是on还是off；如若想要改变UI按钮的状态就要onPowerUsageExtItemsClick()这个方法点击响应事件，但是根据他的响应具体是设置1或者0两个值；

                int bgState = pref.isChecked() ? 1 : 0;
                Log.d(TAG, "background power saving state: " + bgState);
                Settings.System.putInt(mContext.getContentResolver(),
                        Settings.System.BG_POWER_SAVING_ENABLE, bgState);//通过这里写入值

通过字段BG_POWER_SAVING_ENABLE再grep源码

在，frameworks/base/services/core/java/com/mediatek/datashaping/DataShapingServiceImpl.java文件中又做了处理（设置以及开始改变功能的实现）：

    public void start() {
        mGateOpenState = new GateOpenState(this, mContext);
        mGateOpenLockedState = new GateOpenLockedState(this, mContext);
        mGateCloseState = new GateCloseState(this, mContext);
        setCurrentState(DATA_SHAPING_STATE_OPEN_LOCKED);
 
        Slog.d(TAG, "start check user preference");
        mContext.getContentResolver().registerContentObserver(
                Settings.System.getUriFor(Settings.System.BG_POWER_SAVING_ENABLE), true,
                mSettingsObserver);
        mSettingsObserver.onChange(false);
    }

    public boolean openLteDataUpLinkGate(boolean isForce) {
        if (!mDataShapingEnabled) {
            Slog.d(TAG, "[openLteDataUpLinkGate] DataShaping is Disabled!");
            return false;
        }
        boolean powerSavingEnabled = 0 != Settings.System.getInt(
                mContext.getContentResolver(), Settings.System.BG_POWER_SAVING_ENABLE, 0);
        /// M: AlarmGrouping & DataShaping Testing Config to force Enable or Disable Feature. @{
        if ("0".equals(SystemProperties.get("persist.alarmgroup.enable", "-1"))) {
            powerSavingEnabled = false;
            Slog.d(TAG, "[openLteDataUpLinkGate] persist.alarmgroup.enable is false");
        } else if ("1".equals(SystemProperties.get("persist.alarmgroup.enable", "-1"))) {
            powerSavingEnabled = true;
            Slog.d(TAG, "[openLteDataUpLinkGate] persist.alarmgroup.enable is true");
        }
        /// M: AlarmGrouping & DataShaping Testing Config to force Enable or Disable Feature. @}
        if (powerSavingEnabled) {
            if (System.currentTimeMillis() - mLastAlarmTriggerSuccessTime
                    >= ALARM_MANAGER_OPEN_GATE_INTERVAL) {
                if (mDataShapingHandler != null) {
                    mDataShapingHandler.sendEmptyMessage(MSG_ALARM_MANAGER_TRIGGER);
                }
                mLastAlarmTriggerSuccessTime = System.currentTimeMillis();
                Slog.d(TAG, "Alarm manager openLteDataUpLinkGate: true");
                return true;
            } else {
                Slog.d(TAG, "Alarm manager openLteDataUpLinkGate: false");
                return false;
            }
        } else {
            Slog.d(TAG, "[openLteDataUpLinkGate] powerSaving is Disabled!");
            return false;
        }
    }

    private ContentObserver mSettingsObserver = new ContentObserver(new Handler()) {
         public void onChange(boolean selfChange) {
            boolean dataShapingEnabled = 0 != Settings.System.getInt(
                    mContext.getContentResolver(), Settings.System.BG_POWER_SAVING_ENABLE, 0);
                    .
                    .
                    .
                    .
}

frameworks/base/packages/SettingsProvider/src/com/mediatek/providers/utils/ProvidersUtils.java，通过这个文件就可看出framework设置的具体值，

        loadIntegerSetting(stmt, Settings.System.BG_POWER_SAVING_ENABLE,
                R.integer.def_bg_power_saving);

但是这个是由R.integer.def_bg_power_saving供值，所以追踪到：

frameworks\base\packages\SettingsProvider\res\values\mtk_defaults.xml中的 以下字段

<integer name="def_bg_power_saving">1</integer><!-设置对应的值，选择0关闭或者1开启-->