Send notification from the server to user segment who installed the app

Question

In Firebase console, I saw the option to send a notification to User Segement with app "com.example" (where com.example is the app name).

As the image shows:

But how to do it from the server side using the FCM REST API:

https://fcm.googleapis.com/fcm/send

Answer 1

Unfortunately, it is not possible to send messages to User Segments using the FCM REST API.

As an alternative, you'll have to make use of the other ways to send messages to multiple devices, like simply using the registration_ids parameter and Topics Messaging (which I think is the most preferable for your use-case).

Here are samples on how to send this using Postman or cURL.

Answer 2

i found a solution u can subscribe your app to a specific topic for example your app package name in your FirebaseInstanceIdService class so u can send data massage like

 {
  "to" : "/topics/your_package_name",
  "data" : {
    "key1" : "value 1",
    "key2": "value 2",
   ...
  }
}

here is the code to subscribe your app to topic in FirebaseInstanceIdService class

     public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService
    {
        private final String TAG="your_tag";
        @Override
        public void onTokenRefresh() {


        // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        FirebaseMessaging.getInstance().subscribeToTopic("your_app_package_name");
        }
}

its worked for me