使用AlarmManager将多个pendingIntent调度到同一活动

Question

最近,当我尝试使用AlarmManager计划将来运行的活动时,我注意到了奇怪的行为.查看下面的代码,第一个活动在20秒内启动,而第二个活动不是在40秒内启动,而是在60秒后启动.任何人都可以解释为什么第二个意图没有安排调用第二个活动而不是第三个意图.这是否意味着我只能在AlarmManager中只有一个活动意图.

//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);'

Answer 1

这是否意味着我只能在AlarmManager中只有一个活动意图.

不,但这意味着你需要与众不同PendingIntents.你在打电话:

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

两次,因此两次getActivity()调用返回相同PendingIntent.

或者:

• 对第二个参数使用不同的值getActivity(),或

• 对Intent对象做一些事情以使它们充分不同,例如使用不同的动作字符串(注意:附加功能不够)