authentication - 如果用户已经登录，则让他们直接进入仪表板页面（Google Auth with Flutter）

Question

如果用户已经登录，我如何跳过登录页面并直接进入主屏幕？

我从以下网址看到了教程：https ://youtu.be/RIiQSd_C1hs

我想获得简单的解决方案，例如自动检查您是否登录然后转到仪表板页面

这是我用于这个项目的代码

主要飞镖：

import 'package:login/home.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: HomePage(),
    );
  }
}

主页.dart

import 'package:google_sign_in/google_sign_in.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  bool _isLoggedIn = false;
  GoogleSignInAccount _userObj;
  GoogleSignIn _googleSignIn = GoogleSignIn();

  @override
  Widget build(BuildContext context) {
    
    return Scaffold(
      appBar: AppBar(title: Text("Codesundar")),
      body: Container(
        child: _isLoggedIn
            ? Column(
                children: [
                  Image.network(_userObj.photoUrl),
                  Text(_userObj.displayName),
                  Text(_userObj.email),
                  TextButton(
                      onPressed: () {
                        _googleSignIn.signOut().then((value) {
                          setState(() {
                            _isLoggedIn = false;
                          });
                        }).catchError((e) {});
                      },
                      child: Text("Logout"))
                ],
              )
            : Center(
                child: ElevatedButton(
                  child: Text("Login with Google"),
                  onPressed: () {
                    _googleSignIn.signIn().then((userData) {
                      setState(() {
                        _isLoggedIn = true;
                        _userObj = userData;
                      });
                    }).catchError((e) {
                      print(e);
                    });
                  },
                ),
              ),
      ),
    );
  }
}

保护你

标签： authentication