第020例-一个简单的登录页-(学习Flutter第7天)

演示

网页地址:网页演示

参考

https://codelabs.flutter-io.cn/codelabs/mdc-101-flutter-cn/

使用到的类

SafeArea 安全区域容器,解决刘海屏显示
ListView
SizeBox
Column
TextField
ButtonBar
TextButton
ElevatedButton

1. 创建项目

flutter create example020_mdc100series

2. AS打开

3. 添加依赖、放入资源文件

  assets:
    - assets/diamond.png
    - assets/slanted_menu.png

4. 编写代码

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
    
    
  @override
  Widget build(BuildContext context) {
    
    
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: LoginPage()

    );
  }
}

class LoginPage extends StatefulWidget {
    
    
  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
    
    
  // TODO: Add text editing controllers (101)
  @override
  Widget build(BuildContext context) {
    
    
    return Scaffold(
      body: SafeArea(
        child: ListView(
          padding: EdgeInsets.symmetric(horizontal: 24.0),
          children: <Widget>[
            SizedBox(height: 80.0),
            Column(
              children: <Widget>[
                Image.asset('assets/diamond.png'),
                SizedBox(height: 16.0),
                Text('SHRINE'),
              ],
            ),
            SizedBox(height: 120.0),
            TextField(
              decoration: InputDecoration(
                filled: true,
                labelText: 'Username',
              ),
            ),
            SizedBox(height: 12.0),
            TextField(
              decoration: InputDecoration(
                filled: true,
                labelText: 'Password',
              ),
              obscureText: true,
            ),
            ButtonBar(
              children: <Widget>[
                TextButton(
                  child: Text('CANCEL'),
                  onPressed: () {
    
    
                  },
                ),
                ElevatedButton(
                  child: Text('NEXT'),
                  onPressed: () {
    
    
                  },
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

6. 调试运行

AS中先打开Android或者iOS模拟器，点运行按钮。
或在命令行中运行:

flutter run

7. 打包web

flutter build web

8.源码

https://gitee.com/ruik2080/example-flutter