Android 系统中config.xml和defaults.xml区别

首先直接说结论：
1.config.xml是平台性的默认配置文件；
2.defaults.xml是系统应用中provider里面的默认值;
这个两个默认配置直接是交集关系，那么谁的优先级高呢？

public DisplayPowerController(Context context,
369            DisplayPowerCallbacks callbacks, Handler handler,
370            SensorManager sensorManager, DisplayBlanker blanker) {
371        mHandler = new DisplayControllerHandler(handler.getLooper());
372        mBrightnessTracker = new BrightnessTracker(context, null);
373        mSettingsObserver = new SettingsObserver(mHandler);
374        mCallbacks = callbacks;
375
376        mBatteryStats = BatteryStatsService.getService();
377        mSensorManager = sensorManager;
378        mWindowManagerPolicy = LocalServic