Android Notifications - lesson learned from implementation

Recently some Conf Call Dialer users asked to add notifications to the application, so (since it seems to be a good idea) I've spent few hours implementing them in the app. Everything went smoothly, except of one rather funny problem, after executing NotificationManager.notify, notifications were not showing up and I was getting all the time the following warning in the LogCat (12345 is the id assigned to the notification):


notify: id corrupted: sent 12345, got back 0

My code seemed to be rather simple (mostly copy paste from the javadoc, with some app specific logic added):

 
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this).
setContentTitle(event.subject).setContentText(event.timeFrom + " " + additionalText);
// ...
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(notificationId, mBuilder.build());

Googling didn't help, so I compare the code to the standard and the only difference was lack of the small icon (well, I didn't have it at this time so I decided I will skip it). And guess what - without a small icon the notification will NOT work and the only message you'll get is the "id corrupted" mentioned above.

The following code works already:

 
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this).
setContentTitle(event.subject).setContentText(event.timeFrom + " " + additionalText).setSmallIcon(R.drawable.ic_action_search);
// ...
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(notificationId, mBuilder.build());