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On Flutter web, the google_sign_in package renderButton is successfully prompting me to log in with google, but when I select an account, it gets stuck on ";. My code is based on this example from the google_sign_in GitHub repository. The only error in the console says “Uncaught TypeError: Cannot read properties of null (reading "postMessage')”.

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in_web/web_only.dart';
import 'package:google_sign_in/google_sign_in.dart';

class LoginPage extends StatefulWidget {
  const LoginPage({super.key});

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final fireStoreInstance = FirebaseFirestore.instance;
  bool isLoading = false;
  String _status = "Checking login status...";
  late UserCredential? tempCred;

  final GoogleSignIn _gsi = GoogleSignIn(
    clientId: '[MY_CLIENT_ID].apps.googleusercontent', //yes, I used the correct client ID
  );
  GoogleSignInAccount? _currentUser;

  @override
  void initState() {
    _gsi.onCurrentUserChanged.listen((GoogleSignInAccount? account) async {
      setState(() {
        _currentUser = account;
        _status = _currentUser?.email ?? "Something is null...";
      });
      await _gsi.requestScopes(['.birthday.read']);
    });
    super.initState();
    //_gsi.signInSilently(); //unnecessary for now, since I'm just testing renderButton
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).primaryColor,
        toolbarHeight: 50,
        actions: [
          IconButton(
            icon: const Icon(Icons.home_max_sharp),
            onPressed: () {
              Navigator.pop(context);
            },
          ),
        ],
      ),
      body: Center(
        child: isLoading
            ? Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const CircularProgressIndicator(),
                  const SizedBox(height: 20),
                  Text(_status), // Show status for debugging
                ],
              )
            : Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  const SizedBox(height: 20),
                  renderButton(
                    configuration: GSIButtonConfiguration(
                      shape: GSIButtonShape.pill,
                      size: GSIButtonSize.medium,
                      logoAlignment: GSIButtonLogoAlignment.center,
                    ),
                  ),
                  const SizedBox(height: 20),
                  Text(
                    _status,
                    style: const TextStyle(
                      fontSize: 16,
                      color: Colors.red, 
                    ),
                  ),
                ],
              ),
      ),
    );
  }
}

I was expecting the Oauth process to complete, with the status text either showing the user's email or "Something is null...". The status text did not change and as mentioned, the sign in window was stuck on "accounts.google/gsi/transform" after selecting an account.

The url of my Project IDX workspace is authorized in the Firebase console, I have double checked the client ID is correct, and the url of the workspace is authorized for Oauth redirects. Any idea what I am missing here?

本文标签： dartFlutter Web googlesignin renderButton freezing log in processStack Overflow

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