我正在尝试用Flutter登录。 我正在咨询Web服务。 我想在Post请求的正文中发送来自不同TextFormField的用户名和密码。我怎样才能做到这一点? 这是我一直在努力的代码。
import 'package:flutter/material.dart';
import 'package:device_id/device_id.dart';
import 'package:http/http.dart' as http;
import 'dart:async';
import 'dart:convert';
class SignIn extends StatefulWidget {
@override
_SignInState createState() => _SignInState();
}
class _SignInState extends State<SignIn> {
Future<String> getData() async {
final response = await http.post(
Uri.encodeFull("The route i'm consulting),
body: {
"username": user,
"password": password
},
我想从下面的用户名和密码TextFormField中检索输入文本
headers: {
"Accept": "application/json",
});
print(response.statusCode);
print(response.body);
}
String _deviceid = 'Unknown';
String user = '';
String password = '';
TextEditingController controller = new TextEditingController();
TextEditingController controller2 = new TextEditingController();
@override
void dispose() {
controller.dispose();
controller2.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
username = TextFormField(
这是我要检索的第一个TextFormField,以将其发送到请求正文中
controller: controller,
keyboardType: TextInputType.text,
autofocus: false,
decoration: InputDecoration(
hintText: "Username",
hintStyle: TextStyle(fontSize: 16.0),
contentPadding: EdgeInsets.fromLTRB(20.0, 0.0, 20.0, 10.0),
border:
UnderlineInputBorder(borderRadius: BorderRadius.circular(32.0))),
);
final password = TextFormField(
这是我要检索的第二个TextFormField,以将其发送到请求正文中
controller: controller2,
autofocus: false,
obscureText: true,
decoration: InputDecoration(
hintText: "Password",
hintStyle: TextStyle(fontSize: 16.0),
contentPadding: EdgeInsets.fromLTRB(20.0, 25.0, 20.0, 10.0),
border:
UnderlineInputBorder(borderRadius: BorderRadius.circular(32.0))),
);
final loginButton = Padding(
padding: EdgeInsets.symmetric(vertical: 25.0),
child: Material(
borderRadius: BorderRadius.circular(30.0),
shadowColor: Colors.blueAccent.shade100,
elevation: 10.0,
child: MaterialButton(
minWidth: 200.0,
height: 42.0,
color: Colors.blueAccent,
onPressed: (){
},
child: Text(
"Login",
style: TextStyle(color: Colors.white),
),
),
),
);
return Form(
child: new Center(
child: ListView(
padding: EdgeInsets.only(left: 24.0, right: 24.0, top: 10.0),
children: <Widget>[
username,
SizedBox(height: 8.0),
password,
SizedBox(height: 24.0),
loginButton
]),
),
);
}
}
答案 0 :(得分:8)
请参见Retrieve the value of a text field。
StatefulWidget
TextEditingController
中添加两个State
字段,每个TextFormField
中一个字段controller
构造函数参数)myController.text
我不确定您是否也在询问如何发送HTTP发布请求。
这是一个非常小的示例:
class LoginScreen extends StatefulWidget {
@override
State<StatefulWidget> createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
final _usernameController = TextEditingController();
final _passwordController = TextEditingController();
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
TextFormField(controller: _usernameController,),
TextFormField(controller: _passwordController, obscureText: true,),
RaisedButton(
onPressed: _performLogin,
child: Text('Login'),
)
],
);
}
void _performLogin() {
String username = _usernameController.text;
String password = _passwordController.text;
print('login attempt: $username with $password');
}
}
答案 1 :(得分:4)
这是登录屏幕的完整示例……您可以在其中验证输入并在通过验证后提交数据。
import 'package:flutter/material.dart';
import '../mixins/validate_mixin.dart';
class LoginScreen extends StatefulWidget{
final GlobalKey<ScaffoldState> scaffoldKey;
LoginScreen(this.scaffoldKey);
@override
State<StatefulWidget> createState() {
return LoginScreenState(scaffoldKey);
}
}
class LoginScreenState extends State<LoginScreen> with ValidateMixin{
final formKey = GlobalKey<FormState>();
final GlobalKey<ScaffoldState> scaffoldKey;
LoginScreenState(this.scaffoldKey);
String _email;
String _password;
@override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.all(40.0),
child: Form(
key: formKey,
child: Column(
children: <Widget>[
emailField(),
passwordField(),
Container(margin: EdgeInsets.only(bottom: 25.0),),
submitButton(),
],
),
),
);
}
Widget emailField() {
return TextFormField(
decoration: InputDecoration(hintText: 'ali@gmail.co', labelText: 'Email'),
keyboardType: TextInputType.emailAddress,
validator: validateEmail,
onSaved: (String value) {
_email = value;
},
);
}
Widget passwordField() {
return TextFormField(
obscureText: true,
decoration: InputDecoration(hintText: '*****', labelText: 'Password'),
onSaved: (String value) {
_password = value;
},
);
}
Widget submitButton() {
return RaisedButton.icon(
color: Colors.cyan[900],
textColor: Colors.white,
label: Text('Submit'),
icon: Icon(Icons.save),
onPressed: () {
final bool v = formKey.currentState.validate();
if (v) {
formKey.currentState.save();
_performLogin();
print('object');
}
},);
}
void _performLogin () {
var snackbar = new SnackBar(
content: Text('Email: $_email and Password $_password'),
);
scaffoldKey.currentState.showSnackBar(snackbar);
}
}
您可以返回完整的示例。 https://github.com/barakat-turki/flutter_login_screen