Google sign in flutter without Firebase

steps to google sign in flutter
Error
Google Sign-In Error: PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 12500: , null, null)

Step-by-Step: Google Sign-In in Flutter (Without Firebase)

Google Cloud Console Setup Go to the Google Cloud Console.

Create an OAuth 2.0 Client ID for Android.

Enter your app’s package name (e.g., com.cotocus.motoshare.partner).

Enter the SHA-1 certificate fingerprint from your Play Console’s "App signing key certificate" (as shown in your screenshot).

Save the configuration.

Note:The SHA-1 certificate fingerprint in the Google Cloud Console matches the App signing key certificate SHA-1 from the Play Console.

Flutter Project Setup Add the google_sign_in package to your pubspec.yaml.

No need to specify clientId for Android unless you have a special use case.
in pubspec.yml

  google_sign_in: ^6.3.0

Implement Google Sign-In Logic Create a service (GoogleAuthService) to handle the sign-in logic using the google_sign_in package.

In your UI, use a button (like your ElevatedButton.icon) to trigger the sign-in process.
import necessary package and create button

import 'package:google_sign_in/google_sign_in.dart';
import 'package:motoshare_partner/Screen/Auth/google_auth_service.dart';
  final GoogleAuthService _authService = GoogleAuthService();
  final GoogleSignIn _googleSignIn = GoogleSignIn(
  scopes: ['email', 'profile'],
    );
ElevatedButton.icon(
  icon: Image.asset(
    'assets/google_logo.png', // Make sure this image exists in your assets
    height: 24.0,
  ),
  label: const Text('Sign in with Google'),
  onPressed: _handleGoogleSignIn,
  style: ElevatedButton.styleFrom(
    padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
    backgroundColor: Colors.white, // Optional: match Google branding
    foregroundColor: Colors.black, // Optional: match Google branding
    minimumSize: const Size(double.infinity, 50),
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(4.0),
      side: const BorderSide(color: Color(0xFF4285F4)), // Optional: blue border
    ),
  ),
),

when i click button

Future<void> _handleGoogleSignIn() async {
    setState(() => _isLoading = true);    
    try {
      final GoogleSignInAccount? account = await _authService.signIn();

      if (account != null) {
          print('GoogleSignInAccountEmail: ${account.email}');           // Gmail ID (email)
        print('GoogleSignInAccount Display Name: ${account.displayName}'); // Name (display name)
          final loginViewModel = Provider.of<LoginViewModel>(context, listen: false);

      // Call your login_email function with the Google account email
      await loginViewModel.login_emails(account.email);
       bool success = await loginViewModel.login_emails(account.email!); // ✅ Get status
       print("mycode");
       print(success);
       if (success) { // Ensure widget is still mounted
      print("i m inside");
       Navigator.pushReplacement(
            context,
            MaterialPageRoute(builder: (context) => DashboardScreen(email: account.email.toString())),
          );
         }
       // _navigateToProfileScreen(account);
      } else {
        // Handle sign-in failure
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Sign in canceled or failed')),
        );
      }
    } catch (error) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Error signing in: $error')),
      );
    } finally {
      setState(() => _isLoading = false);
    }
  }

create one dart file

import 'package:motoshare_partner/Screen/Auth/google_auth_service.dart';

import 'package:google_sign_in/google_sign_in.dart';

class GoogleAuthService {
  final GoogleSignIn _googleSignIn = GoogleSignIn(
    scopes: ['email', 'profile'],
    // The clientId is optional for Android but required for web

  );

  // Sign in with Google
  Future<GoogleSignInAccount?> signIn() async {
    try {
      // Try to sign in silently first (if user previously signed in)
      GoogleSignInAccount? account = await _googleSignIn.signInSilently();

      // If silent sign-in fails, show the sign-in UI
      account ??= await _googleSignIn.signIn();

      if (account != null) {
        final GoogleSignInAuthentication googleAuth = await account.authentication;
        // You can use googleAuth.accessToken and googleAuth.idToken as needed
        print('Access Token: ${googleAuth.accessToken}');
        print('ID Token: ${googleAuth.idToken}');
         print('Email: ${account.email}');           // Gmail ID (email)
        print('Display Name: ${account.displayName}'); // Name (display name)
      }

      return account;
    } catch (error) {
      print('Google Sign-In Error: $error');
      return null;
    }
  }

  // Sign out from Google
  Future<void> signOut() async {
    try {
      await _googleSignIn.signOut();
      print('User signed out successfully');
    } catch (error) {
      print('Sign Out Error: $error');
    }
  }

  // Check if user is signed in
  Future<bool> isSignedIn() async {
    return await _googleSignIn.isSignedIn();
  }

  // Get current user
  GoogleSignInAccount? getCurrentUser() {
    return _googleSignIn.currentUser;
  }
}

Sign-In Flow in Your Code When the user taps the Google sign-in button, _handleGoogleSignIn is called.

This calls your GoogleAuthService.signIn() method:

First, it tries to sign in silently (if the user is already authenticated).

If not, it shows the Google sign-in UI.

On success, you get a GoogleSignInAccount object with user info (email, display name, etc.).

You can also access the user’s accessToken and idToken if needed.

Your app then uses the signed-in user’s email to check or create an account in your backend (as in your login_emails call).

If the login is successful, you navigate to the dashboard.

Production Release Considerations The SHA-1 in Google Cloud Console must match the Play Console’s App signing key (which you have done).

When users download your app from the Play Store, Google will only allow sign-in if the SHA-1 and package name match what you set in the Cloud Console.

Google Sign-In Error: PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 12500: , null, null)

note

Add All Relevant SHA-1 Keys
You must add both:


The SHA-1 from the Google Play Console (for production)

The SHA-1 from your local debug keystore (for local development and emulator)

Steps:

Get your debug SHA-1:

On Windows:

keytool -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android

Debug School

Google sign in flutter without Firebase

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