Flutter使用StatefulWidget有状态组件累计添加数组

import 'package:flutter/material.dart'; //快捷方式:fim

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

//自定义组件
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('首页'),
        ),
        body: HomePage(),
      ),
      theme: ThemeData(primarySwatch: Colors.blueGrey),
    );
  }
}

class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  List list = new List();
  @override
  Widget build(BuildContext context) {
    return ListView(
      children: <Widget>[
        Column(
          children: this.list.map((value) {
            return ListTile(
              title: Text(value),
            );
          }).toList(),
        ),
        SizedBox(height: 20),
        RaisedButton(
          child: Text("按钮"),
          onPressed: () {
            setState(() {
              //改变数据
              this.list.add("新增数据1");
              this.list.add("新增数据2");
            });
          },
        )
      ],
    );
  }
}