问题
I am building an app that set 2 alarms for each day of the week (at a certain hour and minute), the alarms repeat week after week forever.
Now the point is: if the user changes the alarms, I will need cancel the previously set alarms.
Is there a way to simply cancel all the alarms set by my application ?
回答1:
I think you could get an eye on : AlarmManager.Cancel
And on that Question/Answer: Android: Get all PendingIntents set with AlarmManager
As stated in there you can't ask to the AlarmManager to tell you what PendingIntent are in it. But I think you can make some PendingIntent similar to the one you want to cancel ;).
回答2:
if you are canceling previous alarms then in PendingIntent your flag should be PendingIntent.FLAG_CANCEL_CURRENT. It will prevent generating a new PendingIntent if it is already created. And make sure that before setting in alarm just cancel that same PendingIntent and after that set your alarm. You should try like this:
AlarmManager 2AlarmsInWeekAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
PendingIntent pendingIntent = PendingIntent.getService/getActivity(context, int, intent, PendingIntent.FLAG_CANCEL_CURRENT);
2AlarmsInWeekAlarmManager.cancel(pendingIntent);
and then you may use set or setRepeating method.
In your case it should be
2AlarmsInWeekAlarmManager.setRepeating(AlarmManager.RTC_WAKEUP, "timeInMillis", "repetitionTimeInMillis", pendingintent);
This guarantees that before setting an alarm will cancel all previously alarm with the same PendingIntent.
Hope you got this!
来源：https://stackoverflow.com/questions/17569896/android-alarmmanager-is-there-a-way-to-cancell-all-the-alarms-set