flutter网格布局之GridView组件

import ‘package:flutter/material.dart‘;

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text(‘FlutterDemo‘)),
        body: LayoutDemo(),
      ));
  }
}
class LayoutDemo extends StatelessWidget {  
  @override
  Widget build(BuildContext context) {    
    return GridView.count(

        crossAxisCount: 3,  //一行的 Widget 数量
        children: <Widget>[
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘),
          Text(‘这是一个文本‘)
        ],
    );
  }
}

class LayoutDemo extends StatelessWidget {  
  List<Widget> _getListData() {
    List listData=[
      {
          "title": ‘Candy Shop‘,
          "author": ‘Mohamed Chahin‘,
          "imageUrl": ‘https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2191520521,2689315141&fm=27&gp=0.jpg‘,
      },
       {
          "title": ‘Childhood in a picture‘,
          "author": ‘Google‘,
          "imageUrl": ‘https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2606512668,2361120991&fm=27&gp=0.jpg‘,
      },
      {
          "title": ‘Alibaba Shop‘,
          "author": ‘Alibaba‘,
          "imageUrl": ‘https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2191520521,2689315141&fm=27&gp=0.jpg‘,
      },  
    ];
      var tempList=listData.map((value){
          return Container(            
            child:Column(
                children: <Widget>[
                  Image.network(value[‘imageUrl‘]),
                  SizedBox(height: 12),
                  Text(
                    value[‘title‘],
                    textAlign: TextAlign.center,
                    style: TextStyle(
                      fontSize: 20
                    ),
                  )
                ],
            ),
            decoration: BoxDecoration(
              border: Border.all(
                color:Color.fromRGBO(233, 233,233, 0.9),
                width: 1
              )
            ),
            // height: 400,  //设置高度没有反应
          );
      });
      return tempList.toList();
  }

  @override
  Widget build(BuildContext context) {    
    return GridView.count(
        crossAxisSpacing:10.0 ,   //水平子 Widget 之间间距
        mainAxisSpacing: 10.0,    //垂直子 Widget 之间间距
        padding: EdgeInsets.all(10),
        crossAxisCount: 2,  //一行的 Widget 数量
        // childAspectRatio:0.7,  //宽度和高度的比例
        children: this._getListData(),
    );
  }
}

class LayoutDemo extends StatelessWidget {  
  List listData=[
      {
          "title": ‘Candy Shop‘,
          "author": ‘Mohamed Chahin‘,
          "imageUrl": ‘https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2606512668,2361120991&fm=27&gp=0.jpg‘,
      },
       {
          "title": ‘Childhood in a picture‘,
          "author": ‘Google‘,
          "imageUrl": ‘https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2191520521,2689315141&fm=27&gp=0.jpg‘,
      },
  ];

  Widget _getListData (context,index) {
        return Container(            
            child:Column(
                children: <Widget>[
                  Image.network(listData[index][‘imageUrl‘]),
                  SizedBox(height: 12),
                  Text(
                    listData[index][‘title‘],
                    textAlign: TextAlign.center,
                    style: TextStyle(
                      fontSize: 20
                    ),
                  )
                ],
            ),
            decoration: BoxDecoration(
              border: Border.all(
                color:Color.fromRGBO(233, 233,233, 0.9),
                width: 1
              )
            ),
             // height: 400,  //设置高度没有反应
          );
  }

  @override
  Widget build(BuildContext context) {    
    return GridView.builder(
        //注意
        gridDelegate:SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisSpacing:10.0 ,   //水平子 Widget 之间间距
          mainAxisSpacing: 10.0,    //垂直子 Widget 之间间距          
          crossAxisCount: 2,  //一行的 Widget 数量
        ),
        itemCount: listData.length,
        itemBuilder:this._getListData,
    );
  }
}