How to cancel alarm from AlarmManager

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The PendingIntent needs to be created exactly as it was when you start the AlarmManager, and it looks like the main issue is that you’re using a different requestCode (zero instead of one).

For a quick fix, this should work:

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
                                 getApplicationContext(), 1, myIntent, 0);

alarmManager.cancel(pendingIntent);

In order to use PendingIntent.FLAG_UPDATE_CURRENT flag, see below:

Setting:

Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
                                getApplicationContext(), 1, myIntent, 
                                PendingIntent.FLAG_UPDATE_CURRENT);

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

alarmManager.set(AlarmManager.RTC, now.getTimeInMillis(), pendingIntent);

Cancelling:

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
                                getApplicationContext(), 1, myIntent, 
                                PendingIntent.FLAG_UPDATE_CURRENT);

alarmManager.cancel(pendingIntent);

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