notification.dart

import 'dart:async';

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
    FlutterLocalNotificationsPlugin();

const AndroidNotificationChannel highPriorityChannel =
    AndroidNotificationChannel(
  'ORDER_UPDATE', // id
  'ORDER UPDATES', // title
  'Real-time notification of order update,change.', // description
  importance: Importance.max,
  enableVibration: true,
  playSound: true,
  showBadge: true,
);

const AndroidNotificationChannel generalChannel = AndroidNotificationChannel(
  'GENERAL', // id
  'GENERAL NOTIFICATIONS', // title
  'General notification about offers, alert, promotions etc', // description
  importance: Importance.defaultImportance,
  playSound: true,
);

void _onMessageHandler(RemoteMessage message) {
  print("************************************************");
  print("on message called ${message.notification}");
  print("on message called ${message.data}");
  print("************************************************");

  RemoteNotification? notification = message.notification;
  AndroidNotification? android = message.notification?.android;

  if (notification != null && android != null) {
    flutterLocalNotificationsPlugin.show(
        notification.hashCode % 128,
        notification.title,
        notification.body,
        NotificationDetails(
          android: AndroidNotificationDetails(
            highPriorityChannel.id,
            highPriorityChannel.name,
            highPriorityChannel.description,
            // other properties...
          ),
        ));
  }
}

Future<void> _backgroundMessageHandler(RemoteMessage message) async {
  print("**************************************************");
  print("Handling a background message: ${message.notification}");
  print("Handling a background message: ${message.data}");
  print("**************************************************");
}

// initialise the plugin. app_icon needs to be a added as a drawable resource to the Android head project
const AndroidInitializationSettings initializationSettingsAndroid =
    AndroidInitializationSettings('notification');

void initializeNotification() async {
  final InitializationSettings initializationSettings =
      InitializationSettings(android: initializationSettingsAndroid);

  await flutterLocalNotificationsPlugin.initialize(initializationSettings);
  await flutterLocalNotificationsPlugin
      .resolvePlatformSpecificImplementation<
          AndroidFlutterLocalNotificationsPlugin>()
      ?.createNotificationChannel(highPriorityChannel);

  await flutterLocalNotificationsPlugin
      .resolvePlatformSpecificImplementation<
          AndroidFlutterLocalNotificationsPlugin>()
      ?.createNotificationChannel(generalChannel);

  FirebaseMessaging.onMessage.listen(_onMessageHandler);
  FirebaseMessaging.onBackgroundMessage(_backgroundMessageHandler);
}