Android AlarmManager: is there a way to cancell ALL the alarms set?-ThrowExceptions

Exception or error:

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 ?

How to solve:

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 ;).

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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!

###

I had same problem for cancelling alarms, and solved it. What you should do is simply do –

  1. When you create alarms, save request code of PendingIntent object (to shared preference).
  2. At later, when you want to cancel the alarm, create the same PendingIntent with the same request code (obviously from shared preference).
  3. Call cancel() of AlarmManager and pass the PendingIntent object in it, and alarm will be cancelled.

    private void cancelAlarm(int requestCode) {
        AlarmManager alarmManager = (AlarmManager) getSystemService(
            Context.ALARM_SERVICE
        );
        Intent intent = new Intent(this, MyBroadCastReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(
            getApplicationContext(), 
            requestCode, 
            intent, 
            0
        );
        alarmManager.cancel(pendingIntent);
    }
    

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