EP23. Flutter 패키지 Push Notification Service 구현

flutter pub add firebase_messaging flutter pub add flutter_local_notifications flutter pub add package_info_plus flutter pub get

<manifest xmlns:android="http://schemas.android.com/apk/res/android"> <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/> // 👈 Notification 권한 사용 선언 <application ...>

import 'package:firebase_messaging/firebase_messaging.dart'; import 'package:flutter_local_notifications/flutter_local_notifications.dart'; import 'package:package_info_plus/package_info_plus.dart'; // 플러그인 인스턴스를 전역으로 정의 final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin(); late AndroidNotificationChannel channel; const String notificationIcon = '@mipmap/ic_launcher'; // '@mipmap/ic_launcher'파일을 푸시 아이콘으로 사용합니다. // 최상위 함수로 백그라운드 메시지 핸들러 정의 Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async { // 필요한 초기화 작업 수행 await _initializeFlutterLocalNotificationsPlugin(); await _initializeAndroidNotificationChannel(); var notification = message.notification; var android = message.notification?.android; if (notification != null && android != null) { await flutterLocalNotificationsPlugin.show( notification.hashCode, notification.title, notification.body, NotificationDetails( android: AndroidNotificationDetails( channel.id, channel.name, icon: notificationIcon, importance: Importance.high, ), ), ); } } // 플러그인 초기화 Future<void> _initializeFlutterLocalNotificationsPlugin() async { const AndroidInitializationSettings initializationSettingsAndroid = AndroidInitializationSettings(notificationIcon); const DarwinInitializationSettings initializationSettingsIOS = DarwinInitializationSettings( requestAlertPermission: true, requestBadgePermission: true, requestSoundPermission: true, ); const InitializationSettings initializationSettings = InitializationSettings( android: initializationSettingsAndroid, iOS: initializationSettingsIOS ); await flutterLocalNotificationsPlugin.initialize(initializationSettings); } // 안드로이드 알림 채널 초기화 Future<void> _initializeAndroidNotificationChannel() async { final packageInfo = await PackageInfo.fromPlatform(); final packageName = packageInfo.packageName; // 안드로이드 알림 채널 설정 channel = AndroidNotificationChannel( packageName, 'notification', importance: Importance.high, ); // 안드로이드용 알림 채널 생성 await flutterLocalNotificationsPlugin .resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>() ?.createNotificationChannel(channel); } class FPPushNotificationService { FPPushNotificationService() { _initializeFlutterLocalNotificationsPlugin(); } // 알림 권한 요청 메서드 Future<void> requestPermission() { return FirebaseMessaging.instance.requestPermission( alert: true, announcement: false, badge: true, carPlay: false, criticalAlert: false, provisional: false, sound: true, ); } // 현재 알림 권한 상태를 가져오는 메서드 Future<bool?> hasPermission() async { var settings = await FirebaseMessaging.instance.getNotificationSettings(); switch (settings.authorizationStatus) { case AuthorizationStatus.authorized: return true; case AuthorizationStatus.notDetermined: // iOS에만 존재하는 상태. iOS는 Push 권한을 나중에 받지만 Android는 Manifest에서 받기 때문에 true/false로만 반환 return null; default: return false; } } // 현재 FCM 토큰을 가져오는 메서드 Future<String?> getToken() async { return await FirebaseMessaging.instance.getToken(); } // 알림 초기화 메서드 Future<void> initializeNotification({required Function(String? fcmToken) updatedTokenHandler}) async { FirebaseMessaging messaging = FirebaseMessaging.instance; await messaging.setForegroundNotificationPresentationOptions( alert: true, badge: true, sound: true, ); await _initializeAndroidNotificationChannel(); // 포그라운드 메시지 수신 리스너 설정 FirebaseMessaging.onMessage.listen((RemoteMessage message) async { var notification = message.notification; var android = message.notification?.android; if (notification != null && android != null) { await _showLocalNotification(notification); // 로컬 알림 표시 } }); // 백그라운드 메시지 핸들러 설정 FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler); // 초기 FCM 토큰 및 토큰 갱신 핸들러 설정 final token = await FirebaseMessaging.instance.getToken(); if (token != null) { await updatedTokenHandler(token); } FirebaseMessaging.instance.onTokenRefresh.listen(updatedTokenHandler); } // 로컬 알림 표시 메서드 Future<void> localNotification({int id = 0, required String? title, required String? body}) async { await flutterLocalNotificationsPlugin.show( id, title, body, NotificationDetails( android: AndroidNotificationDetails( channel.id, channel.name, icon: notificationIcon, importance: Importance.high, ), ), ); } // 로컬 알림을 표시하는 내부 메서드 Future<void> _showLocalNotification(RemoteNotification notification) async { await flutterLocalNotificationsPlugin.show( notification.hashCode, notification.title, notification.body, NotificationDetails( android: AndroidNotificationDetails( channel.id, channel.name, icon: notificationIcon, importance: Importance.high, ), ), ); } }

import 'package:flutter_package_sample/services/user_service.dart'; import 'package:swm_flutter_package/entities/user.dart'; import 'package:swm_flutter_package/services/push_notification_service.dart'; import 'dart:async'; class RootModel { final UserService userService; final FPPushNotificationService pushNotificationService; RootModel(this.userService, this.pushNotificationService); Stream<FPUser?> getUserStream() { return userService.getUserStream().transform(StreamTransformer.fromHandlers( handleData: (FPUser? user, EventSink<FPUser?> sink) { if (user != null) { initPushNotification(); } sink.add(user); }, )); } bool isSignedIn() { return userService.isSignedIn(); } void initPushNotification() { pushNotificationService.initializeNotification(updatedTokenHandler: (fcmToken) async { if (fcmToken != null) { await userService.upsertFCMToken(fcmToken: fcmToken); } }); } Future<bool?> hasPermission() async { return await pushNotificationService.hasPermission(); } }