Discussion :

[DaTheWolf]

Bonjour,

J'utilise Flutter dernière version stable.
voici:
J'ai demandé à Gemini de m'écrire une classe pour authentification Firebase avec fournisseur Google la voici:

Code :

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import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
 
/// A screen that provides a button to trigger Google Sign-In and handles the
/// entire authentication flow with Firebase.
class SignInDemo extends StatefulWidget {
  const SignInDemo({super.key});
 
  @override
  State<SignInDemo> createState() => _SignInDemoState();
}
 
class _SignInDemoState extends State<SignInDemo> {
  // A single, reusable instance of the GoogleSignIn client.
  final GoogleSignIn _googleSignIn = GoogleSignIn();
 
  // State to manage the loading indicator on the button.
  bool _isSigningIn = false;
 
  /// Performs the entire Google Sign-In flow and authenticates with Firebase.
  Future<void> _signInWithGoogle() async {
    // Prevent multiple sign-in attempts.
    if (_isSigningIn) return;
 
    setState(() {
      _isSigningIn = true;
    });
 
    try {
      // 1. Initiate the Google Sign-In flow.
      final GoogleSignInAccount? googleUser = await _googleSignIn.signIn();
 
      // If the user canceled the process, stop here.
      if (googleUser == null) {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Sign-in canceled by user.')),
          );
        }
        return; // Early exit
      }
 
      // 2. Obtain the authentication details from the Google user account.
      final GoogleSignInAuthentication googleAuth = await googleUser.authentication;
 
      // 3. Create a new Firebase credential using the Google tokens.
      final AuthCredential credential = GoogleAuthProvider.credential(
        accessToken: googleAuth.accessToken,
        idToken: googleAuth.idToken,
      );
 
      // 4. Sign in to Firebase with the new credential.
      // This action will be picked up by the StreamBuilder in AuthWrapper,
      // which will then navigate to the main application screen.
      await FirebaseAuth.instance.signInWithCredential(credential);
 
    } catch (e) {
      // Handle any errors that occur during the process.
      print('Error during Google sign-in: $e');
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Error: ${e.toString()}')),
        );
      }
    } finally {
      // Ensure the loading state is always reset, even if an error occurs.
      if (mounted) {
        setState(() {
          _isSigningIn = false;
        });
      }
    }
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Sign In'),
        elevation: 2,
      ),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(24.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const Text(
                'Welcome to Mesh Masks',
                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 16),
              const Text(
                'Please sign in with your Google account to continue.',
                textAlign: TextAlign.center,
              ),
              const SizedBox(height: 48),
              _isSigningIn
                  ? const CircularProgressIndicator()
                  : ElevatedButton.icon(
                      icon: const Icon(Icons.login), // Example icon
                      onPressed: _signInWithGoogle,
                      label: const Text('Sign In with Google'),
                      style: ElevatedButton.styleFrom(
                        minimumSize: const Size(double.infinity, 50), // Make button wider
                      ),
                    ),
            ],
          ),
        ),
      ),
    );
  }
}

La compilation donne 3 erreurs:

> Task :app:compileFlutterBuildRelease
lib/signin_screen.dart:16:38: Error: Couldn't find constructor 'GoogleSignIn'.
final GoogleSignIn _googleSignIn = GoogleSignIn();
^^^^^^^^^^^^
lib/signin_screen.dart:32:67: Error: The method 'signIn' isn't defined for the type 'GoogleSignIn'.
- 'GoogleSignIn' is from 'package:google_sign_in/google_sign_in.dart' ('../../AppData/Local/Pub/Cache/hosted/pub.dev/google_sign_in-7.2.0/lib/google_sign_in.dart').
Try correcting the name to the name of an existing method, or defining a method named 'signIn'.
final GoogleSignInAccount? googleUser = await _googleSignIn.signIn();
^^^^^^
lib/signin_screen.dart:49:33: Error: The getter 'accessToken' isn't defined for the type 'GoogleSignInAuthentication'.
- 'GoogleSignInAuthentication' is from 'package:google_sign_in/src/token_types.dart' ('../../AppData/Local/Pub/Cache/hosted/pub.dev/google_sign_in-7.2.0/lib/src/token_types.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'accessToken'.
accessToken: googleAuth.accessToken,
^^^^^^^^^^^
Target kernel_snapshot_program failed: Exception


> Task :app:compileFlutterBuildRelease FAILED

[fred1599]

Ces erreurs indiquent une incompatibilité entre le code écrit et la version de la dépendance google_sign_in que vous utilisez. Le code a été généré pour une ancienne version du package, et l'API a depuis introduit des "breaking changes"

Il faut adapter votre code à cette version