Final answer:
To get the notification number on Android, use the NotificationManager class, create a notification, set the notification number, and display the notification.
Step-by-step explanation:
To get the notification number on Android, you can use the NotificationManager class in the Android SDK. First, you need to create a notification using the NotificationCompat.Builder class and set a small icon, title, and content text for the notification. Then, you can use the setNumber() method to set the notification number, which will appear as a badge on the app icon. Finally, you can use the notify() method of the NotificationManager class to display the notification with the notification number.