Click on the Notification programmatically
Solution 1:
Not all accessibility events will return a source. In fact, most (or at least the events that occur most frequently) do not. Make sure you're limiting to a reasonable subset of events in your configuration AND/OR doing a null check on event.getSource().
Solution 2:
If you want to click on the notification, you have to extend the NotificationListenerService, implement what have to be implemented then you can call sbn.getNotification().contentIntent.send(). This way is like if user was clicking on the notification from the notification tray.