collapsing-notifications

Collapsing Notifications implements the best practices to handle and collapse FCM notifications.

AppPushNotification

AppPushNotification is responsible for resolving PushNotificationItem. It also decides when to show/hide a notification. Here’s the flow:

CollapsingNotificationManager

CollapsingNotificationManager is one of the dependencies injected in AppPushNotification which manages collapsing of notifications.

1. Notifications will collapse based on collapse_key from RemoteMessage. Ergo, you should be sending a payload with a collapse_key.
2. When the first notification (of say type_a) is triggered, the usual notification will be shown.
3. When second notification (of say type_a) is triggered, it is added to the queue and if the size of this list of type_a notification is greater than 1, flag shouldCollapse is set to true.
4. Hence, the previous notification is cleared and the collapsing text will be shown based on the type. In this case, it will be “You have 2 notifications of Type-A”.
5. Similar steps will be followed for type_b notifications and so on.
6. When user taps on or dismisses this notification from Notification Tray, this list of type_a notifications cleared. MainActivity handles the tap whereas NotificationDismissTracker takes care of dismissal.

Reference

Android Notifications — An elegant way to build and display