PushNotificationService class

Documents added by Alaa, enjoy ^-^: There are 3 major things to consider when dealing with push notification :

Creating the notification:

When the app is killed or in background state, creating the notification is handled through the back-end services. When the app is in the foreground, we have full control of the notification. so in this case we build the notification from scratch.

Handle notification click:

When the app is killed, there is a function called getInitialMessage which returns the remoteMessage in case we receive a notification otherwise returns null. It can be called at any point of the application (Preferred to be after defining GetMaterialApp so that we can go to any screen without getting any errors)
When the app is in the background, there is a function called onMessageOpenedApp which is called when user clicks on the notification. It returns the remoteMessage.
When the app is in the foreground, there is a function flutterLocalNotificationsPlugin, is passes a future function called onSelectNotification which is called when user clicks on the notification.

Constructors