# FCM Cloud Messaging > Firebase 提供的應用程式通知工具 FKT  ---- ## 可應用通知平台 既然是通知，想必是應用在使用者的環境 - Android - IOS - Unity - Web - Flutter ---- ## 通知流程架構 BaaS  --- ## 實作環節 ---- ### 被通知者 Flutter 為例 放置 Firebase Service 設定檔案  ---- ```dart= Future<void> main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp();//初始化 Firebase Core messaging = FirebaseMessaging.instance; //取得 FCM 物件 final fcmToken = await messaging.getToken(); //設置使用者 Token 用於發布 print(fcmToken); // 也可以透過訂閱主題 發布給訂閱者 await messaging.subscribeToTopic('flutter_notification'); // 套用 Firebase 初始化監聽器 FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler); runApp(MyApp()); } ``` ---- ### 發布者以 Python 為例  ---- ```python= import firebase_admin import os from firebase_admin import credentials from firebase_admin import messaging # 從 Firebase Console 下載 cred = credentials.Certificate('petmonitoringsystem-729da-firebase-adminsdk-85ae8-e6dd9c9252.json') firebase_admin.initialize_app(cred) message = messaging.Message( notification=messaging.Notification( title='FCM Notification', body='This is a test notification from FCM' ), token=os.getenv("FCM_DEVICE_TOKEN")#剛剛 Flutter 取得的使用者 Token ) response = messaging.send(message) print('Successfully sent message:', response) ``` ---  ---- ## 謝謝大家