简介:GridView是Flutter中用于展示网格布局的widget,我们通常使用GridView.count构造函数来创建一个GridView
demo:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
const CITY_NAMES = {
'北京':['东城区','西城区','海淀区','朝阳区','石景山区','顺义区'],
'上海':['黄浦区','徐汇区','长宁区','静安区','普陀区','闸北区'],
'广州':['越秀','海珠','荔湾','天河','白云','黄埔','南沙'],
'深圳':['南山','福田','罗湖','盐田','龙岗','宝安','龙华'],
'杭州':['上城区','下城区','江干区','拱墅区','西湖区','滨江区'],
'苏州':['姑苏区','吴中区','相城区','高新区','虎丘区','工业园区','吴江区'],
};
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text("网格布局"),
),
//crossAxisCount 每行显示的个数
body: GridView.count(crossAxisCount: 2,children: _buildList(),)
),
);
}
List<Widget> _buildList(){
return CITY_NAMES.keys.map((city)=>_item(city)).toList();
}
Widget _item(String city){
return Container(
height: 80,
margin: EdgeInsets.only(bottom: 5),
alignment: Alignment.center,
decoration: BoxDecoration(color: Colors.blue),
child: Text(
city,
style: TextStyle(color: Colors.white,fontSize: 20),
),
);
}
}