TF-1202: Add doc

docs/configuration/fcm_configuration.md

@@ -0,0 +1,17 @@
+## Configuration for App Grid
+
+### Context
+- Team Mail using FCM service
+- User need config env for FCM service
+- Now only support to Android
+### How to config
+
+1.Add environment of FCM service in [env.file](https://github.com/linagora/tmail-flutter/blob/master/env.file)
+```
+FIREBASE_ANDROID_API_KEY=abc
+FIREBASE_ANDROID_APP_ID=abc
+FIREBASE_ANDROID_MESSAGING_SENDER_ID=123
+FIREBASE_ANDROID_PROJECT_ID=abc
+FIREBASE_ANDROID_DATABASE_URL=https://abc.app
+FIREBASE_ANDROID_STORAGE_BUCKET=abc.com
+```

lib/features/push_notification/presentation/notification_service.dart

@@ -12,7 +12,11 @@ import 'package:tmail_ui_user/features/push_notification/presentation/firebase_o
 @pragma('vm:entry-point')
 Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
   await dotenv.load(fileName: 'env.file');
-  await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
+  try {
+    await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
+  } catch (e) {
+    log('NotificationService::initializeNotificationService(): $e');
+  }
   log('firebaseMessagingBackgroundHandler: ${message.data}');
 }
 
@@ -29,7 +33,11 @@ class NotificationService {
   static bool _isFlutterLocalNotificationsInitialized = false;
 
   static Future<void> initializeNotificationService() async {
-    await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
+    try {
+      await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
+    } catch (e) {
+      log('NotificationService::initializeNotificationService(): $e');
+    }
     FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);
     if (_isFlutterLocalNotificationsInitialized) return;
     final _saveFirebaseCacheInteractor = Get.find<SaveFirebaseCacheInteractor>();