[Java] MessagingServices extends FirebaseMessageService to get the FCM Device Token when the app is installed for the first time.

MessagingServices.java

public class MessagingServices extends FirebaseMessagingService {

    public MessagingServices() {
        FirebaseInstallations.getInstance().getId().addOnCompleteListener(
                task -> {
                    if (task.isSuccessful()) {
                        String token = task.getResult();
                        Log.i("token ---->>", token);
                        
                        // store the token in shared preferences
                        PrefUtils.getInstance(getApplicationContext()).setValue(PrefKeys.FCM_TOKEN, token);

                    }
                }
        );
    }
    
    // either use below function to get the token or directly get from the shared preferences
    public static String getToken(Context context) {
        return PrefUtils.getInstance(context).getStringValue(PrefKeys.FCM_TOKEN, "");
    }

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        try {
            // whatever you want
        } catch (Exception e) {
            // whatever you want
            e.printStackTrace();
        }
    }
     
    @Override
    public void onNewToken(@NotNull String token) {
        super.onNewToken(token);
        // whatever you want
    }

}

Note:

The token doesn't change until you uninstall and install the app again, or refresh the token in case of any harm.

Click here for the Kotlin (dagger) version