Google Sign-In in Flutter with Firebase Authentication | Flutter & Firebase Full Integration

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**
- Register your Flutter app (Android & iOS)
- Enable **Google Sign-In** under Authentication → Sign-in method

✅ **Flutter Setup for Firebase**
```yaml
firebase_core: ^latest
firebase_auth: ^latest
google_sign_in: ^latest
```
- 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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### 🛠️ Prerequisites:
- Basic Flutter knowledge
- Flutter SDK & Android Studio installed
- Firebase account (free)

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### 📌 Bonus Tips:
- Don’t forget to add **SHA-1 & SHA-256** keys to Firebase project settings
- Test on physical device/emulator
- Make sure OAuth 2.0 Client ID is enabled in Google Cloud Console

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