Android(安卓)屏幕常亮N秒后自动暗屏

Android，在用户不操作的情况下，定时使屏幕变暗，体验会很好。直接看代码吧。

    // 最大的屏幕亮度       private float maxLight;// 当前的亮度      private float currentLight;// 用来控制屏幕亮度      private Handler lightHandler;    // 60秒时间不点击屏幕，屏幕变暗     private long delayTime = 60 * 1000L; protected void onCreate() {// 保持屏幕常亮getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);// 屏幕亮度控制lightHandler = new Handler(Looper.getMainLooper());          maxLight = getLightness(); }@Override    public boolean dispatchTouchEvent(MotionEvent ev) {if (currentLight == 1) {startSleepTask();return false;}       startSleepTask();          return super.dispatchTouchEvent(ev);    }/**      * 获取亮度      */      private float getLightness() {        WindowManager.LayoutParams localLayoutParams = this.getWindow().getAttributes();          return localLayoutParams.screenBrightness;      }        /**      * 设置亮度       */      private void setLightness(int light) {          currentLight = light;          WindowManager.LayoutParams localLayoutParams = this.getWindow().getAttributes();        localLayoutParams.screenBrightness = (light / 255.0F);        this.getWindow().setAttributes(localLayoutParams);    }/**      * 开启休眠任务      */      private void startSleepTask() {      setLightness((int) maxLight);      stopSleepTask();    lightHandler.postDelayed(sleepWindowTask, delayTime);    }        /**      * 结束休眠任务      */      private void stopSleepTask() {      lightHandler.removeCallbacks(sleepWindowTask);      }        /**      * 休眠任务      */ Runnable sleepWindowTask = new Runnable() {          @Override          public void run() {        setLightness(1);          }      };

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