屏幕关闭后Android广播接收器未启动

我正在使用广播接收器读取Intent.ACTION\u TIME\u滴答声，让它每分钟播放一次服务中的音频。一切正常，但当屏幕关闭时，它不再发出声音。如果我一直打开屏幕或在屏幕关闭的情况下插入usb电缆，它会重新打开。请帮忙，谢谢

另外，经过几次测试，我发现这只发生在我的安卓2.3.6手机上，而在我的4.1.2手机上，它运行没有问题

    @Override
public IBinder onBind(Intent arg0) {
    return null;
}

@Override
public void onCreate() {
    mgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    registerReceiver(new TickReceiver(), new IntentFilter(
            Intent.ACTION_TIME_TICK));
    mp = MediaPlayer.create(this, R.raw.cuckoo);

}

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

    notifyMe();

}

@Override
public void onDestroy() {


    clearNotification();

    if (mp != null){
        mp.release();
        mp = null;
    }

}

public void notifyMe() {
    note = new Notification(R.drawable.front, "Message Inbound!",
            System.currentTimeMillis());

    PendingIntent i = PendingIntent.getActivity(this, 0, new Intent(this,
            LeftAndRightActivity.class), Intent.FLAG_ACTIVITY_CLEAR_TOP
            | Intent.FLAG_ACTIVITY_NEW_TASK);
    note.setLatestEventInfo(this, "Title...", "Subtitle", i);

    note.flags = note.flags | Notification.FLAG_ONGOING_EVENT;

    mgr.notify(NOTIFY_ME_ID, note);
}

public void clearNotification() {
    mgr.cancel(NOTIFY_ME_ID);
}

public void playBeep() {

    mp.start();

}

public class TickReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        playBeep();

    }
}

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尝试在oncreate中执行此操作：

    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    BroadcastReceiver mReceiver = new ScreenReceiver();
    registerReceiver(mReceiver, filter);

---

您在清单中保存的最小sdk是什么？