A notification is a message you can display to the user outside of your application's normal UI. You can create your own notifications in android very easily. Android provides NotificationManager class for this purpose.In order to use this class, you need to instantiate an object of this class by requesting the android system through getSystemService() method.ou can create your own notifications in android very easily. Android provides NotificationManager class for this purpose. In order to use this class, you need to instantiate an object of this class by requesting the android system through getSystemService() method.