Flutter之ExpansionTile组件

import ‘package:flutter/material.dart‘;

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title:‘Flutter Demo‘,
      theme: new ThemeData.dark(),
      home:ExpansionTileDemo()
    );
  }
}

class ExpansionTileDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(‘Expansion Tile Demo‘)),
      body: Center(
        child: ExpansionTile(
          title: Text(‘Expansion Tile‘),
          leading: Icon(Icons.ac_unit),
          backgroundColor: Colors.white12,
          children: <Widget>[
            ListTile(
              title: Text(‘list tile‘),
              subtitle: Text(‘subtitle‘),
            ),
          ],
          initiallyExpanded: true, //打开状态  不写默认false闭合状态
        ),
      ),
    );
  }
}