如何在应用程序关闭后仍保持Alarm Manager运行？

public class MyService extends Service {
    private AlarmManager alarmManager;
    private PendingIntent pendingIntent;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // 创建并配置Alarm Manager
        alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent alarmIntent = new Intent(this, MyReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
        // 设置定时任务，这里设置为每隔1小时触发一次
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 60 * 60 * 1000, pendingIntent);
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        // 取消Alarm Manager的定时任务
        alarmManager.cancel(pendingIntent);
        super.onDestroy();
    }

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

<service android:name=".MyService" />