Flutter+Firebase
Stack IntegrationFlutter + Firebase Integration Guide
Firebase is the default backend for Flutter apps — Auth, Firestore, Storage, and Cloud Functions all have first-class Flutter SDK support.
Use Cases
- Firebase Auth — email/password, Google Sign-In, Apple Sign-In
- Firestore real-time listeners updating Flutter UI automatically
- Firebase Storage for user image and file uploads
- HTTPS Callable Cloud Functions triggered from Flutter
Implementation
Initialize Firebase in main() with await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform). Use StreamBuilder with Firestore snapshots for real-time UI. Firestore security rules are your authorization layer — write them before production. For Stripe or other payment logic, use HTTPS Callable Cloud Functions — never put payment logic in the Flutter client. Google Sign-In requires SHA fingerprints registered in Firebase console; test on a physical device.