Notifications provide a way for an app to deliver a message to the user when the app is not running, or is currently in the background. Notifications appear in the status bar and notification drawer. Local notifications are triggered on the device by the running app while remote notifications are initiated by a remote server and delivered to the device. Local notifications are created using the NotificationCompat.Builder class and issued using the NotificationManager service.
As demonstrated in this chapter, notifications can be configured to provide the user with options (such as launching an activity or saving a message) by making use of actions, intents and the PendingIntent class. Notification bundling provides a mechanism for grouping together notifications to provide an improved experience for apps that issue a greater number of notifications.
