Firebase FCM 后台通知 click_action

Question

i want to navigate to a specific screen route when i click on the background notification for now the default behavior is just launching my app, so how and where do i change the default behavior of the click action

i'm sending the notification using cloud functions, here is the code

const payload: admin.messaging.MessagingPayload = {
  notification: {
    title: doc["senderName"],
    body: doc["msg"],
    sound: "default",
    badge: "1",
  },
  data: {
    type: "chat",
  },
};
return fcm
  .sendToDevice(tokens, payload);

somehow i want to access the type "chat" so from there i can navigate to a chat screen

Answer 1

Use onMessageOpenedApp to handle when a user presses a notification. RemoteMessage has data property which holds the custom parameters.

Answer 2

• When you click on the notification from background state, onMessageOpened stream function is called.

Initialize this stream function in the initState of first page of the app and check the data in payload you received from the notification just like this:

FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) async {

      if (message != null) {
            String screenName = message.data['screenName'];
            print("Screen name is: $screenName");

            if (screenName == 'chat') {
                    //Navigate to your chat screen here
                 }
       }
    });