Can not use google_sign_in with Flutter

Question

I'm trying to implement google_sign_in with my current project. Here is how I'm using the signin method:

 final GoogleSignIn _googleSignIn = GoogleSignIn(
    scopes: [
      'email',
      'profile',
    ],
  );

  String? _accessToken;
  String? _refreshToken;
  GoogleSignInAccount? _user;

  String? get token => _accessToken;

  bool get isAuthenticated => _accessToken != null;

  Future<void> signInWithGoogle() async {
    try {
      final account = await _googleSignIn.signIn();
      final authentication = await account?.authentication;
      final idToken = authentication?.idToken;
      if (idToken != null) {
        final response = await http.post(
          Uri.parse('$baseAuthUrl/oauth2/google'),
          headers: {'Content-Type': 'application/json'},
          body: jsonEncode({'idToken': idToken}),
        );
        if (response.statusCode == 200) {
      
        } else {
          print('Error: ${response.body}');
        }
      }
    } catch (e, stack) {
      print('Google Sign-In error: $e');
      print('Stacktrace: $stack');
    }
  }

I've created the OAuth 2.0 Client ID with the right fingerprint and the package name. When I call the signInWithGoogle method my credentials will be printed, but the idToken is always null.

This is a part of the app/build.gradle file:

  defaultConfig {
        applicationId "com.example.ranger"
        minSdkVersion 21
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

I've also added the package to my AndroidManifest, because it was not in it

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ranger">
    <uses-permission android:name="android.permission.INTERNET"/>
</manifest>

But its still not working. What is missing here? Are there any extra settings?

Иван Игонькин · Accepted Answer · 2025-05-22 08:53:55Z

0

Yes, add extra settings:

And set client ID.

final _googleSignIn = GoogleSignIn(scopes: ['email', 'profile', 'openid'], clientId: clientId);

answered May 22 at 8:53

Иван Игонькин

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