Oh no, you’re stuck! You’ve been trying to implement Sign in with Google using Firebase for your Android app built with Flutter, but it just won’t work. Don’t worry, we’ve all been there! In this article, we’ll take you by the hand and walk you through the entire process, step-by-step, to get you up and running in no time!
- Step 1: Create a New Firebase Project
- Step 2: Enable the Google Sign-In Method
- Step 3: Register Your App
- Step 4: Add the Firebase SDK to Your Flutter Project
- Step 5: Initialize Firebase in Your Flutter App
- Step 6: Add Google Sign-In to Your Flutter App
- Step 7: Handle Sign-In Errors
- Troubleshooting Common Issues
- Conclusion
Step 1: Create a New Firebase Project
First things first, you need to create a new Firebase project. If you haven’t already, head over to the Firebase console and create a new project.
- Go to the Firebase console and sign in with your Google account.
- Click on the “Add project” button.
- Enter your project name and click on the “Create project” button.
Step 2: Enable the Google Sign-In Method
Now that you have a new Firebase project, you need to enable the Google sign-in method.
- In the Firebase console, click on the “Authentication” tab.
- Click on the “Get started” button.
- Click on the “Google” sign-in method.
- Click on the “Enable” button.
Step 3: Register Your App
Next, you need to register your Android app in the Firebase console.
- In the Firebase console, click on the “Project overview” tab.
- Click on the “Register app” button.
- Select “Android” as the platform.
- Enter your app’s package name (e.g., com.example.myapp).
- Click on the “Register app” button.
Step 4: Add the Firebase SDK to Your Flutter Project
Now, you need to add the Firebase SDK to your Flutter project.
dependencies:
flutter:
sdk: flutter
flutter_facebook_auth: ^3.5.3
firebase_core: ^1.10.0
firebase_auth: ^1.10.0
google_sign_in: ^5.0.4
In your pubspec.yaml file, add the above dependencies and run `flutter pub get` in your terminal.
Step 5: Initialize Firebase in Your Flutter App
Next, you need to initialize Firebase in your Flutter app.
import 'package:firebase_core/firebase_core.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
Step 6: Add Google Sign-In to Your Flutter App
Now, you need to add Google sign-in to your Flutter app.
import 'package:google_sign_in/google_sign_in.dart';
final GoogleSignIn _googleSignIn = GoogleSignIn();
Future _signInWithGoogle() async {
final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth = await googleUser.authentication;
final credential = GoogleAuthProvider.credential(
idToken: googleAuth.idToken,
accessToken: googleAuth.accessToken,
);
await FirebaseAuth.instance.signInWithCredential(credential);
}
Step 7: Handle Sign-In Errors
Finally, you need to handle sign-in errors.
Future _signInWithGoogle() async {
try {
final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth = await googleUser.authentication;
final credential = GoogleAuthProvider.credential(
idToken: googleAuth.idToken,
accessToken: googleAuth.accessToken,
);
await FirebaseAuth.instance.signInWithCredential(credential);
} catch (e) {
print('Error signing in with Google: $e');
}
}
Troubleshooting Common Issues
Here are some common issues you might encounter and how to troubleshoot them:
Issue | Solution |
---|---|
Error: “This app is not authorized to use Firebase Authentication” | Make sure you’ve enabled the Google sign-in method in the Firebase console and that you’ve registered your app correctly. |
Error: “Firebase app is not initialized” | Make sure you’ve initialized Firebase in your Flutter app using the `Firebase.initializeApp()` method. |
Error: “Google sign-in failed” | Check that you’ve added the correct dependencies to your pubspec.yaml file and that you’ve imported them correctly in your Dart file. |
Conclusion
And that’s it! You should now have Google sign-in working with Firebase for your Android app built with Flutter. Remember to test your app thoroughly and troubleshoot any issues that arise. If you’re still having trouble, don’t hesitate to reach out to the Flutter community or Firebase support for help.
Happy coding!
Frequently Asked Questions
Stuck on implementing Sign in with Google using Firebase for your Android app built with Flutter? Don’t worry, we’ve got you covered! Here are some common issues and their solutions:
Q: I’ve followed the Firebase documentation, but I’m still getting a “PlatformException” when trying to sign in with Google. What’s going on?
A: Ah, don’t worry, this is a common issue! Make sure you’ve added the `google-services.json` file to your Flutter project’s `android/app` directory and that you’ve configured the `android/app/src/main/java/[your_package_name]/MainActivity.java` file correctly. Also, double-check that your Firebase project is properly set up and that you’ve enabled the Google sign-in method in the Firebase console.
Q: I’m getting a “invalid_request” error when trying to sign in with Google. What’s the fix?
A: This error usually occurs when there’s a mismatch between the authorized JavaScript origins in the Google Cloud Console and the URLs you’re using in your app. Make sure you’ve added the correct authorized JavaScript origins in the Google Cloud Console, and that you’re using the same URLs in your app. Also, try restarting your app and emulator to ensure that the changes take effect.
Q: Why do I need to add the `shade` plugin in my `android/app/build.gradle` file?
A: The `shade` plugin is required to resolve a dependency conflict between Firebase and Google Play Services. By adding the `shade` plugin, you’re essentially creating a separate namespace for the conflicting dependencies, allowing your app to build successfully.
Q: I’ve set up everything correctly, but I’m still not getting the Google sign-in prompt. What’s missing?
A: This could be due to a missing or incorrect configuration in your `android/app/src/main/AndroidManifest.xml` file. Make sure you’ve added the necessary intent filters and permissions for Google sign-in. Also, check that you’ve initialized the Firebase app instance correctly in your Flutter code.
Q: Do I need to handle the sign-in flow manually, or can I use a package like `flutter_facebook_Login` for Firebase authentication?
A: You can use a package like `flutter_signin_with_google` to handle the sign-in flow for you! These packages provide a simple and convenient way to implement Firebase authentication with Google sign-in. Just add the package to your pubspec.yaml file and follow the instructions to get started.