android - 设备屏幕锁定时计时器在服务中变慢

Question

我在服务中使用倒数计时器。计时器像 01,02,03,... 一样继续运行。一切正常。但是当设备屏幕锁定时，计时器变慢但仍在运行。我正在使用PowerManager 但不工作。PowerManager 仅在 USB 电缆连接到 PC 时有效，但当我从 PC 计时器中删除设备时速度变慢。我不知道为什么会出现此问题。请帮我解决这个问题。提前致谢.下面是我的代码。

 @Override
    public void onCreate(){
        super.onCreate();

        PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);
        wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "whatever");
        wl.acquire();

        }

    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);

        flagVibrate=intent.getBooleanExtra("FlagVibrate",false);
        if(mStartTime == 0L){
            mStartTime = SystemClock.uptimeMillis();
            mHandler.removeCallbacks(mUpdateTimeTask);
            mHandler.postDelayed(mUpdateTimeTask, 100);

        }
    }

        @Override
    public void onDestroy() {

        super.onDestroy();
        mHandler.removeCallbacks(mUpdateTimeTask);

        stopSelf();
        wl.release();
    }
        private Runnable mUpdateTimeTask = new Runnable(){

        public void run() {

        final long start = mStartTime;
        long millis = SystemClock.uptimeMillis()- start;

        int seconds = (int) (millis / 1000);
        int stopTime = (int) (millis / 1000);
        int minutes = seconds / 60;
        seconds = seconds % 60;

        GuardMeActivity.timerView.setText("" + minutes + ":"
                              + String.format("%02d", seconds));

        timerStop1 = minutes + ":"
                  + String.format("%02d", seconds);



        }

}

};

Answer 1

在您的 GuardMeActivity Activity 的 onResume() 方法中写下以下代码并检查结果。

要导入的文件

import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;

Window window = this.getWindow();
window.addFlags(LayoutParams.FLAG_DISMISS_KEYGUARD);
window.addFlags(LayoutParams.FLAG_SHOW_WHEN_LOCKED);
window.addFlags(LayoutParams.FLAG_TURN_SCREEN_ON);