如何正确使用AlarmManager类以固定时间间隔执行任务？ [英] How to correctly use the AlarmManager class to execute a task at fixed intervals?

问题描述

我试图让这必须在固定的时间间隔执行某项任务的应用程序。大量的研究和尝试后，我想通它的更好的内存和电池使用量使用到期AlarmManager类，其效率，而不是运行服务内的计时器。

有一些方面，现在有问题I'me。结果
一个是我应该如何访问到正在被一个previous运行中创建，以便能够取消报警对象？

 意向意图=新意图（getActivity（），MyService.class）;
PendignIntent pintent = PendingIntent.getService（getActivity（），0，意向，0）;
AlarmManager报警=（AlarmManager）getActivity（）getSystemService（Context.ALARM_SERVICE）。
alarm.setInexactRepeating（AlarmManager.RTC_WAKEUP，SystemClock.elapsedRealtime（）+
                            20000，AlarmManager.INTERVAL_FIFTEEN_MINUTES，pintent）;
 

有办法知道如果报警已设置或没有，但它不能给你报警本身。

 布尔alarmUp =（PendingIntent.getService（getActivity（），0，新的意图（getActivity（），MyService.class），PendingIntent.FLAG_NO_CREATE）！= NULL）;
如果（alarmUp）{
   //如何取消报警
}其他{
   Toast.makeText（getActivity（），报警未运行，Toast.LENGTH_SHORT）.show（）;
}
 

解决方案

是遵守前面取消基于类似的PendingIntent这 - 报警

  AlarmManager AM =（AlarmManager）getSystemService（ALARM_SERVICE）;    意图alarmintent1 =新意图（MainActivity.this，AlarmReceiver.class）;
    的PendingIntent sender1 = PendingIntent.getBroadcast（Speed​​Motors.this，100，alarmintent1，PendingIntent.FLAG_UPDATE_CURRENT | Intent.FILL_IN_DATA）;    尝试{
        am.cancel（sender1）;
    }赶上（例外五）{
        // TODO自动生成catch块
        e.printStackTrace（）;
        的System.out.println（EX .....+ E）;
    }    日历CAL = Calendar.getInstance（）;
    cal.add（Calendar.SECOND，5）;
    am.setRepeating（AlarmManager.RTC_WAKEUP，cal.getTimeInMillis（），1000 * 10，sender1）;
    的System.out.println（报警设置...........）;
 

试一试来帮你。

I'm trying to make an app which must execute a certain task at fixed intervals. After much research and trying I figured it's better to use the AlarmManager class due to its efficiency at memory and battery usage instead of running a timer inside a service.

There are some aspects now that I'me having problem with.
One is how should I get access to the alarm object that is been created on a previous run in order to be able to cancel it?

Intent intent = new Intent(getActivity(), MyService.class);
PendignIntent pintent = PendingIntent.getService(getActivity(), 0, intent, 0);
AlarmManager alarm = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime() +
                            20000, AlarmManager.INTERVAL_FIFTEEN_MINUTES, pintent);

There is way to know if the alarm has been set or not but it can't give you the alarm itself.

boolean alarmUp = (PendingIntent.getService(getActivity(), 0, new Intent(getActivity(), MyService.class), PendingIntent.FLAG_NO_CREATE) != null);
if(alarmUp){
   //How to cancel the alarm
}else {
   Toast.makeText(getActivity(), "Alarm not running", Toast.LENGTH_SHORT).show();
}

解决方案

Yes youcan cancel alarm based on PendingIntent like this-

AlarmManager am=(AlarmManager)getSystemService(ALARM_SERVICE);

    Intent alarmintent1=new Intent(MainActivity.this, AlarmReceiver.class);
    PendingIntent sender1=PendingIntent.getBroadcast(SpeedMotors.this, 100, alarmintent1, PendingIntent.FLAG_UPDATE_CURRENT | Intent.FILL_IN_DATA);

    try {
        am.cancel(sender1);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        System.out.println("ex....."+e);
    }

    Calendar cal=Calendar.getInstance();
    cal.add(Calendar.SECOND, 5);


    am.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 1000*10, sender1);
    System.out.println("alarm set...........");

try it ll help you.

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