Aplicación integral de la forma Flutter

Reglas antiguas, mira las representaciones de la imagen
(1)

Copie el siguiente código en el archivo main.dart para ejecutar
(dos) la implementación del código

import 'package:flutter/material.dart';

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
        home: FormDemoPage()//入口函数
    );
  }
}
class FormDemoPage extends StatefulWidget {
  @override
  _FormDemoPageState createState() => _FormDemoPageState();
}

class _FormDemoPageState extends State<FormDemoPage> {
  String username;
  int sex;

  String info;
  List hobby = [
    {
      "checked": true,
      "title": '吃饭',
    },
    {
      "checked": true,
      "title": 'master',
    },
  ];

  List<Widget> _getHobby() {
    List<Widget> tempList = [];
    for (var i = 0; i < this.hobby.length; i++) {
      tempList.add(Row(children: [
        Text(
          this.hobby[i]["title"] + ":",
        ),
        Checkbox(
          value: this.hobby[i]["checked"],
          onChanged: (v) {
            setState(() {
              this.hobby[i]["checked"] = v;
            });
          },
        )
      ]));
      return tempList;
    }
  }
  void _sexChange(v) {
    setState(() {
      this.sex = v;
    });
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          '学员信息登记表',
        ),
      ),
      body: Padding(
        padding: EdgeInsets.all(10),
        child: Column(
          children: [
            TextField(
              decoration: InputDecoration(
                hintText: "请输入用户名",
              ),
            ),
            Row(
              children: [
                Text("男"),
                Radio(
                  value: 1,
                  groupValue: this.sex,
                  onChanged: this._sexChange,
                ),
                SizedBox(
                  height: 10,
                ),
                Text("女"),
                Radio(
                  value: 2,
                  groupValue: this.sex,
                  onChanged: this._sexChange,
                ),
              ],
            ),  
            SizedBox(
              height: 10,
            ),
            Wrap(
              children: _getHobby(),
            ),
            TextField(
              maxLines: 4,
              decoration: InputDecoration(
               border: OutlineInputBorder(),
                hintText: "描述信息",
              ),
              onChanged: (v) {
                setState(() {
                  this.info = v;
                });
              },
            ),
             SizedBox(
              height: 10,
            ),
            Container(
              width: double.infinity,
              height: 40,
              child: RaisedButton(
                child: Text("提交信息"),
                onPressed: () {
                  setState(() {
                    print(this.username);
                    print(this.sex);
                    print(this.hobby);
                  });
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Pregúntame si no entiendes, jeje