In this complete step-by-step guide, you’ll learn **how to integrate Google Sign-In with Firebase Authentication** in your Flutter app. By the end of this tutorial, your app will allow users to **sign in using their Google accounts** seamlessly and securely — powered by Firebase.
This is one of the most common and powerful authentication flows used in mobile apps today, and we’ll walk through everything from scratch — including Firebase setup, Flutter implementation, and testing on a real device.
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### 🚀 What You’ll Learn:
✅ **Set up Firebase Project**
- Create a new project in the [Firebase Console](
- Register your Flutter app (Android & iOS)
- Download and add `google-services.json` for Android
- Add `GoogleService-Info.plist` for iOS
- Enable **Google Sign-In** under Authentication → Sign-in method
✅ **Flutter Setup for Firebase**
- Add necessary Firebase and Google Sign-In dependencies in `pubspec.yaml`:
```yaml
firebase_core: ^latest
firebase_auth: ^latest
google_sign_in: ^latest
```
- Initialize Firebase in `main.dart`
- Configure Android and iOS native code (gradle/plist updates)
✅ **Implement Google Sign-In in Flutter**
- Create Google Sign-In button UI
- Authenticate users using Firebase with Google credentials
- Handle sign-in and sign-out functionality
- Retrieve and display user data: name, email, profile picture
✅ **Run and Test on Device**
- Debug common errors
- Test authentication flow on both Android and iOS
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2025/04/07
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