gsi_ess_mobile/lib/main.dart

import 'dart:ui';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:employee_selfservice_mobile/NotificationService/local_notification_service.dart';
import 'package:employee_selfservice_mobile/Screens/Splash/splash_screen.dart';
import 'Screens/Settings/settings_screen.dart';
import 'constants.dart';
import 'dart:developer' as logDev;
import 'package:firebase_crashlytics/firebase_crashlytics.dart';

import 'firebase_options.dart';

const AndroidNotificationChannel channel = AndroidNotificationChannel(
    'high_importance_channel', // id
    'High Importance Notifications', // title
    description: 'This channel is used for important notifications.', // description
    importance: Importance.high,
    playSound: true);

final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

void main() async{
  WidgetsFlutterBinding.ensureInitialized();
  // if (Firebase.apps.length){
    await Firebase.initializeApp(
      name: "employee-self-service-8280b", options: DefaultFirebaseOptions.currentPlatform
    );
  // }

  //You can automatically catch all errors that are thrown within the Flutter framework by overriding
  FlutterError.onError = (errorDetails) {
    FirebaseCrashlytics.instance.recordFlutterFatalError(errorDetails);
  };

  // Pass all uncaught asynchronous errors that aren't handled by the Flutter framework to Crashlytics
  PlatformDispatcher.instance.onError = (error, stack) {
    FirebaseCrashlytics.instance.recordError(error, stack, fatal: true);
    return true;
  };

  //Force Crash - Crashlytics
  //FirebaseCrashlytics.instance.crash();

  //LocalNotificationService.initialize();
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

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

  LocalNotificationService.initialize();

  FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
    LocalNotificationService.initialize();
    Map<String, dynamic> data = message.data;
    logDev.log(data.toString(), name: "NOTIF Messaging");

    String body = data['body'].toString();
    logDev.log(body, name: "NOTIF Body");

    print('Got a message whilst in the foreground!');
    print('Message data: ${message.data}');

    if (message.notification != null) {
      print('Message also contained a notification: ${message.notification}');
    }

    logDev.log(message.data.toString(), name: "on message listen - DATANYA APA?");
    logDev.log(message.notification!.title.toString(), name: "on message listen - ISI NOTIFNYA APA?");
  });

  await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
    alert: true,
    badge: true,
    sound: true,
  );

  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  void initState(){
    super.initState();

    // 1. This method call when app in terminated state and you get a notification
    // when you click on notification app open from terminated state and you can get notification data in this method
    FirebaseMessaging.instance.getInitialMessage().then((message) {
        print("FirebaseMessaging.instance.getInitialMessage");
        if (message != null) {
          logDev.log("New Notification", name: "NEW NOTIF");
          // if (message.data['_id'] != null) {
          //   Navigator.of(context).push(
          //     MaterialPageRoute(
          //       builder: (context) => DemoScreen(
          //         id: message.data['_id'],
          //       ),
          //     ),
          //   );
          // }
        }
      },
    );

    // 2. This method only call when App in forground it mean app must be opened
    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      RemoteNotification? notification = message.notification!;
      //AndroidNotification? android = message.notification?.android;
      if (notification != null) {
        flutterLocalNotificationsPlugin.show(
            notification.hashCode,
            notification.title,
            notification.body,
            NotificationDetails(
              android: AndroidNotificationDetails(
                channel.id,
                channel.name,
                channelDescription: channel.description,
                color: Colors.blue,
                playSound: true,
                icon: '@mipmap/ic_launcher',
              ),
            ));
      }
      logDev.log(message.data.toString(), name: "onMessage listen - DATANYA APA?");
      logDev.log(message.notification!.title.toString(), name: "onMessage listen - ISI NOTIFNYA APA?");
    });

    // 3. This method only call when App in background and not terminated(not closed)
    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message)  {
      print('A new onMessageOpenedApp event was published!');
      RemoteNotification? notification = message.notification;
      //AndroidNotification? android = message.notification?.android;
      if (notification != null) {
        showDialog(
            context: context,
            builder: (_) {
              return Scaffold(
                body: Builder(builder: (context) => Center(
                  child: ElevatedButton(
                    onPressed: () {
                      Navigator.push(context, MaterialPageRoute(
                          builder: (context) => SettingsScreen()));
                    },
                    child: Text("Click"),
                  ),
                )),
              );
            });
      }
      logDev.log(message.data.toString(), name: "Opened APP - DATANYA APA?");
      logDev.log(message.notification!.title.toString(), name: "Opened APP - ISI NOTIFNYA APA?");
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Welcome Screen',
      theme: ThemeData(
          primaryColor: kPrimaryColor,
          scaffoldBackgroundColor: Colors.white
      ),
      home: Splash(),
    );
  }
}

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  logDev.log(message.data.toString(), name: "BACKGROUND HANDLER - DATANYA APA?");
  logDev.log(message.notification!.title.toString(), name: "BACKGROUND HANDLER - ISI NOTIFNYA APA?");
}
/*void sendLogMessage(String message) {
  FirebaseCrashlytics.instance.log(message);
}*/