Android服务:START_STICKY不适用于Kitkat

Question

我在应用程序中使用服务来监听用户按下他/她的电源按钮的次数.实施在所有设备上都运行良好.但是当我在Android Kitkat上测试应用程序时,我注意到了一些错误.

只要我将应用程序从最近的应用程序中移开,应用程序就不再会监听电源按钮.

这是我正在使用的代码:

public class Receiver extends Service {

    Notification notification;
    private static final int NOTIFICATION_ID = 0;
    NotificationManager manager;
    PendingIntent toOpen;
    Intent intent;
    private BroadcastReceiver POWER_BUTTON = new Powerbuttonrecceiver();

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        registerReceiver(POWER_BUTTON, filter);
        startNotify();
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        unregisterReceiver(POWER_BUTTON);
        dismissNotification();
        super.onDestroy();
    }

    public void startNotify(){
        manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        int icon = R.drawable.ic_launcher_drop;
        CharSequence tickerText = "Service activated";
        CharSequence tickerContent = "Service is now on. You can press your power button and the app will listen to it. Tap to turn this feature off";
        intent = new Intent(Receiver.this, Options.class);
        toOpen = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0);

        notification = new NotificationCompat.Builder(getApplicationContext())
        .setContentTitle(tickerText)
        .setContentText(tickerContent)
        .setSmallIcon(icon)
        .setOngoing(true)
        .setContentIntent(toOpen)
        .build();
        manager.notify(NOTIFICATION_ID, notification);
    }

    public void dismissNotification(){
        manager.cancel(NOTIFICATION_ID);
    }

}

可以注意到我正在使用通知来表示该服务是活动的.令我困惑的是,从最近的应用程序轻扫后,通知仍然存在,什么是不活动的BroadcastReceiver？或者是假的.

在应用程序中,onDestroy我没有调用任何函数来注册或取消注册以及停止服务.再一次,这个问题只出现在Android KitKat中.如果你们知道发生了什么事,请.帮忙:)

更新:我也注意到Play Music在Kitkat上,当我将它从最近的应用程序中移开时音乐停止.这是Kitkat的错误吗？但声音/媒体播放器服务SoundCloud甚至可以在从最近的应用程序中删除时工作.

更新:在android问题跟踪器上 记录为问题63618.阅读问题评论了解更多详情.

Answer 1

似乎这是一个存在的错误Android 4.4,使用以下方法解决它:

@Override
public void onTaskRemoved(Intent rootIntent) {
    // TODO Auto-generated method stub
    Intent restartService = new Intent(getApplicationContext(),
            this.getClass());
    restartService.setPackage(getPackageName());
    PendingIntent restartServicePI = PendingIntent.getService(
            getApplicationContext(), 1, restartService,
            PendingIntent.FLAG_ONE_SHOT);
    AlarmManager alarmService = (AlarmManager)getApplicationContext().getSystemService(Context.ALARM_SERVICE);
    alarmService.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() +1000, restartServicePI);

}

所以这是一个在Service类本身中被重写的方法.我使用的原因AlarmManager是Kitkat不会杀死我的服务.