调度多个的PendingIntent使用AlarmManager同一活动 [英] Scheduling more than one pendingIntent to same activity using AlarmManager

问题描述

最近，我注意到奇怪的现象，当我试图计划使用AlarmManager在未来的运行活动。看code以下时，第一活性在20秒开始，而第二活性没有在40秒内，而不是它是仅60秒后开始启动。任何人都可以解释为什么第二个意图不安排第二个活动，而不是被称为第三意图呢。这是否意味着我只能有一个意图在AlarmManager的活动。

  //悬而未决上午意图
    意图myIntent1 =新意图（这一点，Activity1.class）;
    pendingIntent1 = PendingIntent.getActivity（在此，0，myIntent1，0）;
    AlarmManager alarmManager1 =（AlarmManager）getSystemService（ALARM_SERVICE）;
    日历CALENDAR1 = Calendar.getInstance（）;
    //calendar1.set(Calendar.YEAR，的Calendar.MONTH + 1，Calendar.DAY_OF_MONTH，morningTime，0，0）;
    calendar1.setTimeInMillis（System.currentTimeMillis的（））;
    calendar1.add（Calendar.SECOND，20）;
    alarmManager1.set（AlarmManager.RTC_WAKEUP，calendar1.getTimeInMillis（），pendingIntent1）;    //中午未决意图
    意图myIntent2 =新意图（这一点，Activity2.class）;
    pendingIntent2 = PendingIntent.getActivity（在此，0，myIntent2，0）;
    AlarmManager alarmManager2 =（AlarmManager）getSystemService（ALARM_SERVICE）;
    日历CALENDAR2 = Calendar.getInstance（）;
    //calendar2.set(Calendar.YEAR，的Calendar.MONTH + 1，Calendar.DAY_OF_MONTH，中午，0，0）;
    calendar2.setTimeInMillis（System.currentTimeMillis的（））;
    calendar2.add（Calendar.SECOND，40）;
    alarmManager2.set（AlarmManager.RTC_WAKEUP，calendar2.getTimeInMillis（），pendingIntent2）;    //夜间挂起的意图
    意图myIntent =新意图（这一点，Activity2.class）;
    的PendingIntent = PendingIntent.getActivity（在此，0，myIntent，0）;
    AlarmManager alarmManager =（AlarmManager）getSystemService（ALARM_SERVICE）;
    台历挂历= Calendar.getInstance（）;
    //calendar.set(Calendar.YEAR，的Calendar.MONTH + 1，Calendar.DAY_OF_MONTH，夜间，0，0）;
    calendar.setTimeInMillis（System.currentTimeMillis的（））;
    calendar.add（Calendar.SECOND，60）;
    alarmManager.set（AlarmManager.RTC_WAKEUP，calendar.getTimeInMillis（），的PendingIntent）;'
 

解决方案

  

这是否意味着我只能有一个意图在AlarmManager的活动。

没有，但它意味着你需要不同的 PendingIntents 。您呼叫：

 意图myIntent =新意图（这一点，Activity2.class）;
的PendingIntent = PendingIntent.getActivity（在此，0，myIntent，0）;
 

两次，因此两个 getActivity（）调用返回相同的的PendingIntent 。

或者：

• 使用了第二个参数不同的值 getActivity（）或




• 做一些东西到意图对象，使他们足够的差异，如使用不同的操作字符串（注：演员是不够的）

Recently I noticed strange behaviour when i tried to schedule Activities to be run in the future using AlarmManager. Look at the code below, the first activity is started in 20 seconds, while the second activity is not started in 40 seconds instead it is started only after 60 seconds. Can anyone explain why the second intent doesn't schedule the second activity to be called instead the third intent does. Does this mean that i can have only one intent for an activity in the AlarmManager.

//pending intent for morning
    Intent myIntent1 = new Intent(this, Activity1.class);
    pendingIntent1 = PendingIntent.getActivity(this, 0, myIntent1, 0);
    AlarmManager alarmManager1 = (AlarmManager)getSystemService(ALARM_SERVICE);
    Calendar calendar1 = Calendar.getInstance();
    //calendar1.set(Calendar.YEAR, Calendar.MONTH + 1, Calendar.DAY_OF_MONTH, morningTime, 0, 0);
    calendar1.setTimeInMillis(System.currentTimeMillis());
    calendar1.add(Calendar.SECOND, 20);
    alarmManager1.set(AlarmManager.RTC_WAKEUP, calendar1.getTimeInMillis(), pendingIntent1);

    //pending intent for noon
    Intent myIntent2 = new Intent(this, Activity2.class);
    pendingIntent2 = PendingIntent.getActivity(this, 0, myIntent2, 0);
    AlarmManager alarmManager2 = (AlarmManager)getSystemService(ALARM_SERVICE);
    Calendar calendar2 = Calendar.getInstance();
    //calendar2.set(Calendar.YEAR, Calendar.MONTH + 1, Calendar.DAY_OF_MONTH, noonTime, 0, 0);
    calendar2.setTimeInMillis(System.currentTimeMillis());
    calendar2.add(Calendar.SECOND, 40);
    alarmManager2.set(AlarmManager.RTC_WAKEUP, calendar2.getTimeInMillis(), pendingIntent2);

    //pending intent for night
    Intent myIntent = new Intent(this, Activity2.class);
    pendingIntent = PendingIntent.getActivity(this, 0, myIntent, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    Calendar calendar = Calendar.getInstance();
    //calendar.set(Calendar.YEAR, Calendar.MONTH + 1, Calendar.DAY_OF_MONTH, nightTime, 0, 0);
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.add(Calendar.SECOND, 60);
    alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);'

解决方案

Does this mean that i can have only one intent for an activity in the AlarmManager.

No, but it means that you need distinct PendingIntents. You are calling:

Intent myIntent = new Intent(this, Activity2.class);
pendingIntent = PendingIntent.getActivity(this, 0, myIntent, 0);

twice, and therefore the two getActivity() calls are returning the same PendingIntent.

Either:

• Use a different value for the 2nd parameter to getActivity(), or

• Do something to the Intent objects to make them sufficiently different, such as using different action strings (note: extras are not sufficient)

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