Android Tutorial => How to Cancel an Alarm

Example

If you want to cancel an alarm, and you don't have a reference to the original PendingIntent used to set the alarm, you need to recreate a PendingIntent exactly as it was when it was originally created.

An Intent is considered equal by the AlarmManager:

if their action, data, type, class, and categories are the same. This does not compare any extra data included in the intents.

Usually the request code for each alarm is defined as a constant:

public static final int requestCode = 9999;

So, for a simple alarm set up like this:

Intent intent  = new Intent(this, AlarmReceiver.class);
intent.setAction("SomeAction");
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.setExact(AlarmManager.RTC_WAKEUP, targetTimeInMillis, pendingIntent);

Here is how you would create a new PendingIntent reference that you can use to cancel the alarm with a new AlarmManager reference:

Intent intent  = new Intent(this, AlarmReceiver.class);
intent.setAction("SomeAction");
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, requestCode, intent, PendingIntent.FLAG_NO_CREATE);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
if(pendingIntent != null) {
    alarmManager.cancel(pendingIntent);
}

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Android AlarmManager How to Cancel an Alarm

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