如何正确使用AlarmManager类以固定时间间隔执行任务？

本文介绍了如何正确使用AlarmManager类以固定时间间隔执行任务？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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.