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import 'package:flutter/material.dart';void main() =>runApp(  new MyApp());// 在外部定义数据const CITY_Names =['北京','田径','上海','北京','田径','上海','北京','田径','上海','北京','田径','上海','北京','田径','上海','北京','田径','上海','北京','田径','上海',];class MyApp extends StatelessWidget {
     @override  Widget build(BuildContext context) {
       final title = 'Basic List';    return MaterialApp(      title: title,      home: Scaffold(        appBar: AppBar(          title: Text('title'),        ),        body: ListView(        	// 控制水平排列的方向          scrollDirection: Axis.horizontal,          children: _buildList(),        ),      ),    );  }  List
   
     _buildList(){
       return CITY_Names.map((city) =>_item(city)).toList();  }  Widget _item(String city){
       return Container(      //height: 80,      width: 160,      height: 80,      margin: EdgeInsets.only(bottom:5,right: 10),      alignment: Alignment.center,      decoration: BoxDecoration(        color: Colors.teal      ),      child: Text(        city,        style:TextStyle(color:Colors.white,fontSize:20)      ),    );  }}
   

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