关闭应用程序后，Android的警报被取消

我有AlarmManager一个问题，我设置了code调度重复报警，我运行该应用程序后，警报正常运行。即使我点击主页按钮（和应用程序暂停），报警仍运行在它的时间间隔。

I have a problem with AlarmManager, I set the code for scheduling a repeating alarm and after I run the application, the alarm runs fine. Even if I click on Home button (and the application is paused), the alarm still runs on its interval.

现在的问题是，如果我打开任务管理器，强行关闭应用程序，然后报警运行停止。

The problem is if I open the Task Manager and force close the application, then the alarm stops from running.

这是一个正常的行为，有没有办法避免这一点，并关闭应用程序后仍保持报警运行？

Is this a normal behavior, is there any way to avoid this and keep the alarm running after closing the application?

在code低于 - 该方法由一个ApplicationContext类的onCreate（）

The code is below - the method is called by the ApplicationContext class, onCreate().

 private void scheduleAlarm() {
  if (alarmScheduled == true) { return; } // we only need to schedule once.

  int alarmInterval = Def.pref(getApplicationContext()).getInt("alarmInterval", 30);

  final Intent intent = new Intent(getApplicationContext(), CollectorAlarmReceiver.class);
  final PendingIntent pending = PendingIntent.getBroadcast(getApplicationContext(), 0, intent, 0);

  AlarmManager alarmMgr = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);

  alarmMgr.cancel(pending); // cancel others.

  alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+1000,
    alarmInterval*1000, pending);

  Def.log(TAG,"scheduleAlarm(): alarm scheduled, interval: "+alarmInterval+" seconds");
  alarmScheduled = true;
 }

接收器code：

Receiver code:

public void onReceive(Context context, Intent intent) {
    Log.i(TAG, "CollectorAlarmReceiver invoked, starting CollectorService in background");

    context.startService(new Intent(context, CollectorService.class));

    Intent collectorService = new Intent(context,CollectorService.class);
    collectorService.putExtra("action", CollectorService.ACTION_BACKGROUND_REQUEST_MESSAGES);

    context.sendBroadcast(collectorService);
}

谢谢！