鴻蒙傳說

/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/policy/BatteryControllerImpl.java在Intent.ACTION_BATTERY_CHANGED broadcast處理中調(diào)用fireBatteryLevelChanged()方法fireBatteryLevelChanged中會回掉BatteryStateChangeCallbackframeworks/base/packages/SystemUI/src/com/android/systemui/BatteryMeterView.java中實現(xiàn)了BatteryStateChangeCallback， 并向BatteryControllerImpl注冊了，mBatteryController.addCallback(this);?public?void?onAttachedToWindow()?{

????????super.onAttachedToWindow();

????????mBatteryController?=?Dependency.get(BatteryController.class);

????????mBatteryController.addCallback(this);

????????mUser?=?ActivityManager.getCurrentUser();

????????getContext().getContentResolver().registerContentObserver(

????????????????Settings.System.getUriFor(SHOW_BATTERY_PERCENT),?false,?mSettingObserver,?mUser);

????????updateShowPercent();

????????Dependency.get(TunerService.class).addTunable(this,?StatusBarIconController.ICON_BLACKLIST);

????????Dependency.get(ConfigurationController.class).addCallback(this);

????????mUserTracker.startTracking();

????}看下BatteryMeterView中的BatteryStateChangeCallback實現(xiàn)就知道了

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