flutter 学习 expansionTitle

效果

import 'package:flutter/material.dart';
import 'expansion_tile_demo.dart';
void main(List<String> args) {
  runApp(MyApp());
}

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

    );
  }
}

expansion_tile_demo.dart

import 'package:flutter/material.dart';

class ExpansionTileDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('ExpansionTitleDemo'),),
      body: Center(
        child: ExpansionTile(
          title: Text('ExpansionTitle'),
          leading: Icon(Icons.ac_unit),
          backgroundColor: Colors.white12,
          children: <Widget>[
            ListTile(
              title:Text('list tile'),
              subtitle:Text('sub tile'),
            ),
          ],
          initiallyExpanded: true,
        ),
      ),
    );
  }
}