如何在特定时间取消PendingIntent？ [英] How to cancel PendingIntent at specific time?

问题描述

当我没有声明取消时，AlarmManager可以完美地工作，但是当我声明取消时不触发。 b $ b这是代码：

AlarmManager works perfectly when I have not declared cancel but do not fire when I declare the cancel.. Here is the code:

Calendar c= Calendar.getInstance();
                c.set(Calendar.HOUR_OF_DAY, 0); 
                c.set(Calendar.MINUTE, 37);
                c.set(Calendar.SECOND, 0);

            Toast.makeText(this, c.getTime().toString(), Toast.LENGTH_LONG).show();
        intent = new Intent(TestAlarm.this, TestAlarmService.class);
        pi = PendingIntent.getService(TestAlarm.this, 1, intent, 0);
        AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
        am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi);

和取消代码：

 c.add(Calendar.HOUR_OF_DAY, 0);
        c.add(Calendar.MINUTE, 38);
        c.add(Calendar.SECOND, 0);
        PendingIntent pi1=PendingIntent.getService(TestAlarm.this, 1, intent, 0);
        AlarmManager am1 = (AlarmManager) getSystemService(ALARM_SERVICE);
        //stopService(intent);
        am1.cancel(pi);

现在在这里我要启动我的 AlarmManager 一两分钟后在12:37取消并 ...但是无论何时我使用 cancel 代码 AlarmManager 永远不会触发...
预先感谢！ ：）

Now here I want to start my AlarmManager to go off at 12:37 and cancel after one or two minutes...But Whenever I use cancel code the AlarmManager never fires... Thanks in Advance! :)

推荐答案

更改行 am1.cancel（pi）; 到 am1.cancel（pi1）; -您要取消原始的 PendingIntent

Change the line am1.cancel(pi); to am1.cancel(pi1); - you're cancelling the original PendingIntent

此外，在您的取消代码中，您正在调用 c.add（）（添加到当前日期/时间），而不是 c.set（）（明确设置下一个日期/时间）。通过调用 c.add（Calendar.MINUTE，38），实际上是在当前日历中增加38分钟，而不是将时间设置为12:38;

Also, in your cancel code, you're calling c.add() (which add on to the current date/time) instead of c.set() (which explicitly sets the next date/time). By calling c.add(Calendar.MINUTE, 38), you're actually adding 38 minutes to the current Calendar, instead of setting the time to 12:38;

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