我的这个应用程序需要运行一个定期发出蜂鸣声的服务(后台)。 电话需要全天每隔一分钟发出 5 秒的蜂鸣声(在服务中使用了处理程序)。我已经实现了这个完美的服务，但是当手机进入深度 sleep 模式时，这个处理程序的执行停止。使用 this从 SO 中的问题回答，我设法使用唤醒锁并且它工作正常。但是当我明确地将手机置于深度 sleep 模式时，处理程序停止执行。我应该在服务中的什么地方放置唤醒锁。下面的代码 fragment 。

public class PlaySound extends Service{
PowerManager.WakeLock wl ;
    PowerManager pm;
private SoundManager mSoundManager;
    boolean wakeUpFlag = false;

@Override
    public void onCreate(){
        super.onCreate();
        mSoundManager = new SoundManager();
        mSoundManager.initSounds(getBaseContext());
        mSoundManager.addSound(1, R.raw.sound);
    }
@Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        startservice();
        return START_STICKY;
    }
private void startservice() {
        System.out.println("Started the service");
        timer.scheduleAtFixedRate( new TimerTask() {
            public void run() {
                toastHandler.sendEmptyMessage(0);
            }
        }, 0, 60000);
    }
private final Handler toastHandler = new Handler()
    {
        @Override
        public void handleMessage(Message msg)
        {
            result =start();

                System.out.println("result"+result);
                close();
        }
    };

protected void close() {
        try {
            if(wakeUpFlag){
                wl.release();
                System.out.println("Released the wakelock");
            }

            if(!pm.isScreenOn()){
                System.out.println("Screen is off - back to sleep");
                pm.goToSleep(1000);
            }
            else{
                System.out.println("Screen is on - no need to sleep");
            }
            bs.close();
            writer.close();
            System.out.println("Closed socket and writer");
            System.out.println("Size of file:"+f.length()/1024);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
public void start(){
        try{
            wakeUpFlag = false;
            pm = (PowerManager)getSystemService(Context.POWER_SERVICE);


            if(!pm.isScreenOn()) {
                wakeUpFlag  = true;
                wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE,"CollectData");
                System.out.println("Screen off - wake lock acquired");
                wl.acquire();
            }
            else{
                System.out.println("Screen on - no need of wake lock");
            }



        }
        catch(Exception e){
            e.printStackTrace();
        }
mSoundManager.playSound(1);
}

最佳答案

我认为您没有根据 android 文档使用正确的标志 PowerManager :

*If you hold a partial wakelock, the CPU will continue to run, irrespective of any timers and even after the user presses the power button. In all other wakelocks, the CPU will run, but the user can still put the device to sleep using the power button.

换句话说，尝试使用 PARTIAL_WAKE_LOCK 因为这是唯一保证 cpu 运行的方法

关于android - 唤醒锁 android 服务重复出现，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5286947/