login.dart
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import 'package:flutter/material.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',
debugShowCheckedModeBanner: false,
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,
// This makes the visual density adapt to the platform that you run
// the app on. For desktop platforms, the controls will be smaller and
// closer together (more dense) than on mobile platforms.
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: '登录页面'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
TextFieldAndCheckPageState createState() => TextFieldAndCheckPageState();
}
class TextFieldAndCheckPageState extends State<MyHomePage> {
//手机号的控制器
TextEditingController phoneController = TextEditingController();
//密码的控制器
TextEditingController passController = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
// appBar: AppBar(
// title: Text('登录页面'),
// centerTitle: true, // 标题居中
// ),
body:
Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
width: 100,
height: 100,
margin: EdgeInsets.only(bottom: 30),
// child: Image.asset("images/a.jpeg",
// fit:BoxFit.cover,
// ),
child: Image.asset("images/sanyi2.png",
fit:BoxFit.cover,
),
),
Container(
margin: EdgeInsets.only(left:30, right: 30, bottom: 10),
child:
TextField(
controller: phoneController,
decoration: InputDecoration(
border: OutlineInputBorder(),
contentPadding: EdgeInsets.all(10.0),
hintText: '请输入账号',
prefixIcon: Icon(Icons.person),
),
),
),
Container(
margin: EdgeInsets.only(left:30, right: 30, bottom: 10),
child:
TextField(
controller: passController,
decoration: InputDecoration(
border: OutlineInputBorder(),
contentPadding: EdgeInsets.all(10.0),
hintText: '请输入密码',
prefixIcon: Icon(Icons.lock)),
obscureText: true),
),
Container(
height: 50,
margin: EdgeInsets.only(left:30, right: 30, bottom: 10),
width: double.infinity,
child: RaisedButton(
onPressed: _login,
child: Text('登 录',
style: TextStyle(
fontSize: 24,
color: Colors.white
),),
color: Colors.deepOrangeAccent,
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(4),
),
),
),
],
),
),
);
}
void _login() {
print({'phone': phoneController.text, 'password': passController.text});
if (phoneController.text.length != 11) {
showDialog(
context: context,
builder: (context) => AlertDialog(
title: Text('手机号码格式不对'),
));
} else if (passController.text.length == 0) {
showDialog(
context: context,
builder: (context) => AlertDialog(
title: Text('请填写密码'),
));
} else {
showDialog(
context: context,
builder: (context) => AlertDialog(
title: Text('登录成功'),
));
phoneController.clear();
}
}
void onTextClear() {
setState(() {
phoneController.clear();
passController.clear();
});
}
}