Question

I’m writing something like a reminder for users. Users will set reminders for their events, when the time comes, a repeating alarm will be set to trigger a status bar notification. But the alarm seems non-stop after I selected the notification or cleared the notification. I am not sure where to cancel this repeating alarm. Below are some of the codes:
Set up the repeating alarm in my main activity

alarmTime = Calendar.getInstance();
Intent intent = new Intent(this, AlarmReceive.class);
PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

alarmTime.add(Calendar.MINUTE,offset_time);

//Schedule the alarm
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, alarmTime.getTimeInMillis(), 30 * 1000, sender);

In my OnReceive method, I just display the notification in status bar and set the flag as FLAG_AUTO_CANCEL

manager = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);

// Set the icon, scrolling text and timestamp
Notification notification = new Notification(R.drawable.medical, text, System.currentTimeMillis());

PendingIntent contentIntent = PendingIntent.getActivity(context, 0, i, 0);

notification.flags = Notification.FLAG_AUTO_CANCEL;

manager.notify(R.string.service_text, notification);

How can I stop the alarm when the user selects the notification or clears it?

Answer 1

Call cancel() on AlarmManager with an equivalent PendingIntent to the one you used with setRepeating():

Intent intent = new Intent(this, AlarmReceive.class);
PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

alarmManager.cancel(sender);