cloudsolutions-atoms/lib/controllers/notification/firebase_notification_manger.dart

import 'dart:convert';

import 'package:test_sa/models/app_notification.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';

import 'notification_manger.dart';

class FirebaseNotificationManger{

  static FirebaseMessaging messaging = FirebaseMessaging.instance;
  static String token;

  static Future<String> getToken() async {
    NotificationSettings settings = await messaging.requestPermission(
      alert: true,
      announcement: false,
      badge: true,
      carPlay: false,
      criticalAlert: false,
      provisional: false,
      sound: true,
    );

    if(settings.authorizationStatus == AuthorizationStatus.authorized){
      token = await messaging.getToken();
    }
    return token;
  }

  static initialized(BuildContext context) async {
    await Firebase.initializeApp();
    NotificationSettings settings;
    try{
      settings = await messaging.requestPermission(
        alert: true,
        announcement: false,
        badge: true,
        carPlay: false,
        criticalAlert: false,
        provisional: false,
        sound: true,
      );
    }catch(error){
      return;
    }

    if(settings.authorizationStatus != AuthorizationStatus.authorized){
      return;
    }

    // Also handle any interaction when the app is in the background via a
    // Stream listener
    FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);

    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
      AppNotification notification = AppNotification.fromJson(message.data);
      if(notification.path == null
          || notification.path.isEmpty)
        return;
      Navigator.pushNamed(
          context,
          notification.path,
          arguments: notification.requestId
      );
    });

    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      AppNotification notification = AppNotification.fromJson(message.data);
      NotificationManger.showNotification(
        title: message.notification.title,
        subtext: message.notification.body,
        hashcode: int.tryParse(notification.requestId ?? "") ?? 1,
        payload: json.encode(message.data)
      );
      return;
    });
  }
}

Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
}