android - 登录或注册后，用户不会被定向到提要屏幕。（Flutter Firebase）
问题描述
根据我在包装器 (wrapper.dart) 中编写的代码，在用户登录后，应将用户引导至提要屏幕。
但是当我登录时它不起作用（我使用的注册电子邮件与我最初注册时存储在 Firebase 中的相同）。我不知道哪个部分使它出错。
这是代码目录和终端消息。
用户.dart
class UserModel {
final String? id;
UserModel({this.id});
}
认证飞镖
import 'package:firebase_auth/firebase_auth.dart';
import 'package:twitterclone/models/users.dart';
class AuthService {
FirebaseAuth auth = FirebaseAuth.instance;
UserModel? _userFromFirebaseUser(User? user) {
return user != null ? UserModel(id: user.uid) : null;
}
Stream<UserModel?> get user {
return auth.authStateChanges().map(_userFromFirebaseUser);
}
Future signUp(emailSignUp, passwordSignUp) async {
try {
User user = await auth.createUserWithEmailAndPassword(
email: emailSignUp, password: passwordSignUp) as User;
_userFromFirebaseUser(user);
} on FirebaseAuthException catch (e) {
if (e.code == 'weak-password') {
print('The password provided is too weak.');
} else if (e.code == 'email-already-in-use') {
print('The account already exists for that email.');
}
} catch (e) {
print(e);
}
}
Future signIn(emailSignIn, passwordSignIn) async {
try {
User user = (await auth.signInWithEmailAndPassword(
email: emailSignIn, password: passwordSignIn)) as User;
_userFromFirebaseUser(user);
} on FirebaseAuthException catch (e) {
print(e);
} catch (e) {
print(e);
}
}
Future signOut() async {
try {
return await auth.signOut();
} catch (e) {
print(e.toString());
return null;
}
}
}
注册.dart
import 'package:flutter/material.dart';
import 'package:twitterclone/screens/auth/welcome.dart';
import 'package:twitterclone/services/auth/auth.dart';
class SignUp extends StatefulWidget {
@override
_SignUpState createState() => _SignUpState();
}
class _SignUpState extends State<SignUp> {
String emailSignUp = '';
String passwordSignUp = '';
bool _passwordVisible = false;
final AuthService _authService = AuthService();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: IconButton(
color: Colors.black,
icon: Icon(Icons.arrow_back_rounded),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Welcome()),
);
}),
title: Image.asset(
'assets/icons/invale_icon.png',
height: 60,
),
centerTitle: true,
backgroundColor: Colors.white,
elevation: 0,
),
body: SingleChildScrollView(
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 20),
child: Form(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text(
'Create your account',
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 30),
),
SizedBox(
height: 30,
),
TextFormField(
decoration: InputDecoration(
labelText: 'Email', labelStyle: TextStyle(fontSize: 15)),
style: TextStyle(fontSize: 18),
onChanged: (val) => setState(() {
emailSignUp = val;
}),
),
SizedBox(
height: 15,
),
TextFormField(
decoration: InputDecoration(
labelText: 'Password',
labelStyle: TextStyle(fontSize: 15),
suffixIcon: IconButton(
icon: Icon(
_passwordVisible
? Icons.visibility
: Icons.visibility_off,
color: Theme.of(context).primaryColorDark,
),
onPressed: () {
setState(() {
_passwordVisible = !_passwordVisible;
});
},
),
),
style: TextStyle(fontSize: 18),
obscureText: _passwordVisible,
validator: (val) =>
val!.length < 6 ? 'Password too short.' : null,
onChanged: (val) => setState(() {
passwordSignUp = val;
}),
),
],
),
),
),
),
bottomNavigationBar: BottomAppBar(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 8),
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
MaterialButton(
elevation: 0,
child: Text(
'Create account',
style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.bold,
color: Colors.white),
),
color: Color(0xff4aa8e0),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20)),
onPressed: () async =>
{_authService.signUp(emailSignUp, passwordSignUp)},
),
],
),
)),
);
}
}
登录.dart
import 'package:flutter/material.dart';
import 'package:twitterclone/screens/auth/welcome.dart';
import 'package:twitterclone/services/auth/auth.dart';
class SignIn extends StatefulWidget {
@override
_SignInState createState() => _SignInState();
}
class _SignInState extends State<SignIn> {
String emailSignIn = '';
String passwordSignIn = '';
bool _passwordVisible = false;
final AuthService _authService = AuthService();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.white,
elevation: 0,
leading: IconButton(
color: Colors.black,
icon: Icon(Icons.arrow_back_rounded),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Welcome()),
);
}),
title: Image.asset(
'assets/icons/invale_icon.png',
height: 60,
),
centerTitle: true,
),
body: SingleChildScrollView(
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 20),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Log in to Invale.',
style: TextStyle(
color: Colors.black,
fontSize: 25,
fontWeight: FontWeight.bold),
),
SizedBox(
height: 15,
),
TextFormField(
decoration: InputDecoration(
labelText: 'Email', labelStyle: TextStyle(fontSize: 15)),
style: TextStyle(fontSize: 18),
onChanged: (val) => setState(() {
emailSignIn = val;
}),
),
SizedBox(
height: 20,
),
TextFormField(
decoration: InputDecoration(
labelText: 'Password',
labelStyle: TextStyle(fontSize: 15),
suffixIcon: IconButton(
icon: Icon(
_passwordVisible
? Icons.visibility
: Icons.visibility_off,
color: Theme.of(context).primaryColorDark,
),
onPressed: () {
setState(() {
_passwordVisible = !_passwordVisible;
});
},
),
),
obscureText: _passwordVisible,
style: TextStyle(fontSize: 18),
onChanged: (val) => setState(() {
passwordSignIn = val;
}),
),
],
),
),
),
bottomNavigationBar: BottomAppBar(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 8),
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
MaterialButton(
elevation: 0,
child: Text(
'Log in',
style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.bold,
color: Colors.white),
),
color: Color(0xff4aa8e0),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20)),
onPressed: () async =>
{_authService.signIn(emailSignIn, passwordSignIn)},
),
],
),
)),
);
}
}
包装器.dart
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:twitterclone/models/users.dart';
import 'package:twitterclone/screens/auth/welcome.dart';
import 'package:twitterclone/screens/mainscreen/feedscreen.dart';
class Wrapper extends StatelessWidget {
const Wrapper({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
final user = Provider.of<UserModel?>(context);
print(user);
if (user == null) {
return Welcome();
} else {
return FeedScreen();
}
}
}
自应用程序启动以来的终端消息，直到我单击登录按钮
I/flutter ( 7705): null
W/IInputConnectionWrapper( 7705): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper( 7705): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper( 7705): getTextAfterCursor on inactive InputConnection
W/IInputConnectionWrapper( 7705): beginBatchEdit on inactive InputConnection
W/IInputConnectionWrapper( 7705): endBatchEdit on inactive InputConnection
2
W/System ( 7705): Ignoring header X-Firebase-Locale because its value was null.
D/FirebaseAuth( 7705): Notifying id token listeners about user ( Ggeh9OkrDvRXTPaC53hvBXhi4NA2 ).
D/FirebaseAuth( 7705): Notifying auth state listeners about user ( Ggeh9OkrDvRXTPaC53hvBXhi4NA2 ).
I/flutter ( 7705): type 'UserCredential' is not a subtype of type 'User' in type cast
I/flutter ( 7705): Instance of 'UserModel'
解决方案
推荐阅读
- c# - C# OData Unchase 选择单行
- c++ - 即使在 C++20 中 std::memcpy 也不是 constexpr 的原因是什么？
- r - 如何创建包含三列数据的堆叠 geom_bar？
- node.js - ebay-nodejs-获取用户访问令牌-发生意外错误，请联系资源提供者
- javascript - 使用唯一的 Javascript 防止未经授权访问 .html 站点
- javascript - 如何在 react-native 中访问相机我无法将图片保存在手机存储中
- javascript - 使用 Ramda 将对象数组转换为嵌套对象
- apache-kafka - 为什么 Apache Kafka 消费者会使用不同版本的模式来反序列化记录，而不是与数据一起发送的记录？
- javascript - delphi-javascript 库 (js15/spidermonkey) 可以轻松更新到 mozilla 的最新 javascript 引擎版本吗？
- spring-boot - Kafka 未启动时 Spring Boot 应用程序未启动