我昨天发布了这个问题，但我没有得到任何有效的答案。我目前的情况是我可以成功登录用户，但是当我重新启动应用程序时，我必须再次登录，因此我需要在共享首选项中保存用户的详细信息，以便用户可以在整个会话中保持登录状态，直到注销。但我无法做到这一点，所以请帮助我。提前致谢
登录.dart：
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color.fromRGBO(3, 9, 23, 1),
body: Container(
padding: EdgeInsets.only(
top: 100,
right: 30,
left: 30,
),
child: SingleChildScrollView(
child: Form(
key: _formKey,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FadeAnimation(
1.2,
Container(
padding: EdgeInsets.all(70.0),
margin: EdgeInsets.only(bottom: 50.0),
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage(
'assets/images/trakinglogo.png'))),
)),
SizedBox(
height: 30,
),
FadeAnimation(
1.5,
Container(
padding: EdgeInsets.all(10),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Colors.white),
child: Column(
children: <Widget>[
Container(
decoration: BoxDecoration(
border: Border(
bottom:
BorderSide(color: Colors.grey[300]))),
child: TextFormField(
controller: _emailController,
onFieldSubmitted: (_) =>
FocusScope.of(context).nextFocus(),
textInputAction: TextInputAction.done,
validator: (value) {
if (value.isEmpty) {
return 'Email is required';
}
return null;
},
decoration: InputDecoration(
border: InputBorder.none,
hintStyle: TextStyle(
color: Colors.grey.withOpacity(.8)),
hintText: "Votre adresse mail"),
),
),
Container(
decoration: BoxDecoration(),
child: TextFormField(
controller: _passwordController,
validator: (value) {
if (value.isEmpty) {
return 'Password is required';
}
return null;
},
obscureText: _isHidden,
decoration: InputDecoration(
border: InputBorder.none,
hintStyle: TextStyle(
color: Colors.grey.withOpacity(.8)),
hintText: "Mot de passe",
suffix: InkWell(
onTap: _togglePasswordView,
child: Icon(
_isHidden
? (CommunityMaterialIcons
.eye_outline)
: (CommunityMaterialIcons.eye_off),
color: Color(0xFF939394),
SizedBox(
height: 40,
),
FadeAnimation(
1.8,
Center(
child: Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Container(
child: RaisedButton(
textColor: Colors.white,
color: kPrimaryColor,
child: Text("Se connecter"),
onPressed: () async {
if (_formKey.currentState.validate()) {
showDialog(
context: context,
builder: (BuildContext context) {
return Center(
child:
CircularProgressIndicator(),
);
});
await loginUser();
}
/* Navigator.push(
context,
MaterialPageRoute(
builder: (context) => MyWidget()),
);*/
// Navigator.pushNamed(context, 'Mywidget');
},
shape: new RoundedRectangleBorder(
borderRadius:
new BorderRadius.circular(30.0),
),
),
width: 250,
padding: EdgeInsets.all(15),
)
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
AlreadyHaveAnAccountCheck(
press: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return SignUp();
void loginUser() async {
// if (_formKey.currentState.validate()) {
setState(() {
_isLoading = true;
});
String email = _emailController.text;
String password = _passwordController.text;
authentication.login(email, password).then((user) {
if (user != null)
Navigator.push(
context, MaterialPageRoute(builder: (context) => MyWidget()));
}).catchError((error) {
ScaffoldMessenger.of(context)
.showSnackBar(SnackBar(content: Text(error.toString())));
});
setState(() {
_isLoading = false;
});
}
这是登录功能：
Future<User> login(String email, String password) async {
await checkInternet();
Map<String, String> headers = {
'Content-type': 'application/json',
'Accept': 'application/json',
};
Map<String, String> body = {'email': email, 'password': password};
var response = await http.post(Uri.parse(ApiUtil.AUTH_LOGIN),
headers: headers, body: jsonEncode(body));
switch (response.statusCode) {
case 200:
var body = jsonDecode(response.body);
var data = body['user'];
User user = User.fromJson(data);
Track track = Track.fromJson(body);
if (body['code'] == 0) {
SharedPreferences localStorage =
await SharedPreferences.getInstance();
localStorage.setInt('id', body['user']['id']);
localStorage.setString('adress', body['user']['adress']);
localStorage.setString('phone', body['user']['phone']);
localStorage.setString('access_token', body['access_token']);
localStorage.setString('user', json.encode(body['user']));
String user = localStorage.getString('user');
}
return user;
case 500:
throw ('Erreur serveur');
break;
case 400:
throw LoginFailed();
default:
throw ('connection timeout');
break;
}
}
答案 0 :(得分：1)
当我第一次登录时，我将数据保存在共享首选项中
ApiRepository.get().login(LoginRequest(username: _emailController.text, password: _passwordController.text)).then((response) async {
if (response != null) {
//save on the shared preferences that the user is logged in
SharedPreferences prefs = await SharedPreferences.getInstance();
await prefs.setBool(SHARED_LOGGED, true);
await prefs.setString(SHARED_USER, _emailController.text);
await prefs.setString(SHARED_PASSWORD, _passwordController.text);
}
}).catchError((error) {
});
每次我打开应用程序时，我都会有一个闪屏，在这里我会进行隐式登录，然后跳过登录页面并将用户带到主页
void checkUserIsLogged() async {
final prefs = await SharedPreferences.getInstance();
if ((prefs.getBool(SHARED_LOGGED) != null) && prefs.getBool(SHARED_LOGGED)) {
ApiRepository.get().login(LoginRequest(username: prefs.getString(SHARED_USER), password: prefs.getString(SHARED_PASSWORD))).then((response) {
if (response != null) {
//"do something"
}
}).catchError((error) {
});
} else {
}
}
完整代码 SplashPageLoading.dart
class SplashPageLoading extends StatefulWidget {
@override
_SplashPageLoadingState createState() => _SplashPageLoadingState();
}
class _SplashPageLoadingState extends State<SplashPageLoading> {
bool _doLogin = false;
@override
void initState() {
super.initState();
new Future.delayed(const Duration(seconds: 3), () => checkUserIsLogged());
}
void checkUserIsLogged() async {
final prefs = await SharedPreferences.getInstance();
if ((prefs.getBool(SHARED_LOGGED) != null) && prefs.getBool(SHARED_LOGGED)) {
setState(() {
_doLogin = true;
});
ApiRepository.get().login(LoginRequest(username: prefs.getString(SHARED_USER), password: prefs.getString(SHARED_PASSWORD))).then((response) {
if (response != null) {
Navigator.of(context).pushReplacementNamed(HomePage.routeName);
}
}).catchError((error) {
Navigator.of(context).pushReplacementNamed(LoginPage.routeName);
});
} else {
new Future.delayed(const Duration(seconds: 1), () => Navigator.of(context).pushReplacementNamed(LoginPage.routeName));
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Text(
_doLogin ? "Login.." : "No data for login",
style: TextStyle(color: Colors.black),
),
),
);
}
}
字符串.dart
const String SHARED_LOGGED = "USER_IS_LOGGED";
const String SHARED_USER = "USER";
const String SHARED_PASSWORD = "PASSWORD";
答案 1 :(得分：0)
SplashPageLoading.dart :
class SplashPageLoading extends StatefulWidget {
@override
_SplashPageLoadingState createState() => _SplashPageLoadingState();
}
class _SplashPageLoadingState extends State<SplashPageLoading> {
bool _doLogin = false;
Authentication authentication = Authentication();
static const String SHARED_LOGGED = "USER_IS_LOGGED";
static const String SHARED_USER = "USER";
static const String SHARED_PASSWORD = "PASSWORD";
@override
void initState() {
super.initState();
new Future.delayed(const Duration(seconds: 3), () => checkUserIsLogged());
}
void checkUserIsLogged() async {
final prefs = await SharedPreferences.getInstance();
if ((prefs.getBool(SHARED_LOGGED) != null) &&
prefs.getBool(SHARED_LOGGED)) {
setState(() {
_doLogin = true;
});
authentication
.login(prefs.getString(SHARED_USER), prefs.getString(SHARED_PASSWORD))
.then((user) {
if (user != null) {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => MyWidget()),
);
// Navigator.of(context).pushReplacementNamed('/splash');
}
}).catchError((error) {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => MyWidget()),
);
// Navigator.of(context).pushReplacementNamed('/splash');
});
} else {
new Future.delayed(const Duration(seconds: 1),
() => Navigator.of(context).pushReplacementNamed('/'));
}
}
@override
Widget build(BuildContext context) {
return Text(
_doLogin ? "Login.." : "",
style: TextStyle(color: Colors.white),
);
}
}