Firebase Integration
Firebase Auth, Firestore, Cloud Messaging, Analytics, Crashlytics, Remote Config
1Which package should be used to initialize Firebase in a Flutter application?
Which package should be used to initialize Firebase in a Flutter application?
回答
The firebase_core package is the fundamental package required to initialize Firebase in Flutter. It must be added as a dependency and Firebase.initializeApp() must be called before using any other Firebase service. All other Firebase packages (firebase_auth, cloud_firestore, etc.) depend on firebase_core.
2Where should Firebase.initializeApp() be called in a Flutter application?
Where should Firebase.initializeApp() be called in a Flutter application?
回答
Firebase.initializeApp() must be called in the main() function before runApp(), with WidgetsFlutterBinding.ensureInitialized() to ensure Flutter bindings are ready. This async initialization is necessary because Firebase performs native operations that require the Flutter framework to be fully initialized.
3Which Firebase Auth method allows listening to authentication state changes in real-time?
Which Firebase Auth method allows listening to authentication state changes in real-time?
回答
authStateChanges() returns a Stream<User?> that emits events whenever the authentication state changes (sign in, sign out, token refresh). This is the recommended method to handle authentication state reactively in the app, allowing automatic UI updates.
How to create a new user with email and password in Firebase Auth?
What is the difference between authStateChanges() and idTokenChanges() in Firebase Auth?
+15 面接問題