flutter GridView 网格布局

当数据量很大的时候用矩阵方式排列比较清晰。此时我们可以用网格列表组件 GridView 实

现布局。

GridView 创建网格列表有多种方式，常用有以下两种。

1、可以通过 GridView.count 实现网格布局

2、通过 GridView.builder 实现网格布局

示例代码

import 'package:flutter/material.dart';
void main () => runApp(MyApp());

class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context ){
      return MaterialApp(
        title:'ListView widget',
        home:Scaffold(
          body:GridView.count(
            padding:const EdgeInsets.all(20.0),
            crossAxisSpacing: 10.0,
            crossAxisCount: 3,
            children: <Widget>[
              const Text('哈喽'),
              const Text('I LOVE U'),
              const Text('中国红'),
              const Text('玩游戏'),
              const Text('看书'),
              const Text('吃火锅')
            ],
          )
        ),
      );
  }
}

import 'package:flutter/material.dart';
void main () => runApp(MyApp());

class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context ){
      return MaterialApp(
        title:'ListView widget',
        home:Scaffold(
          body:GridView(
            gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 3,
              mainAxisSpacing: 2.0,
              crossAxisSpacing: 2.0,
              childAspectRatio: 0.7
            ),
            children: <Widget>[
             new Image.network('http://img5.mtime.cn/mt/2018/10/22/104316.77318635_180X260X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/10/10/112514.30587089_180X260X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/11/13/093605.61422332_180X260X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/11/07/092515.55805319_180X260X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/11/21/090246.16772408_135X190X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/11/17/162028.94879602_135X190X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/11/19/165350.52237320_135X190X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/11/16/115256.24365160_180X260X4.jpg',fit: BoxFit.cover),
             new Image.network('http://img5.mtime.cn/mt/2018/11/20/141608.71613590_135X190X4.jpg',fit: BoxFit.cover),

            ],
          )
        ),
      );
  }
}

import 'package:flutter/material.dart';

import 'res/listData.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 {  

  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,
    );
  }
}

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 {  

  List<Widget> _getListData() {
      List<Widget> list = new List();

      for (var i = 0; i < 20; i++) {
        list.add(Container(
          alignment: Alignment.center,
          child: Text(
            '这是第$i条数据',
            style: TextStyle(color: Colors.white, fontSize: 20),
          ),
          color: Colors.blue,
          // height: 400,  //设置高度没有反应
        ));
      }
      return list;
  }

  @override
  Widget build(BuildContext context) {
    return GridView.count(
        crossAxisSpacing:20.0 ,   //水平子 Widget 之间间距
        mainAxisSpacing: 20.0,    //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(),
    );
  }
}

import 'package:flutter/material.dart';

import 'res/listData.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 {  

  List<Widget> _getListData() {
      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
          );

      });
      // ('xxx','xxx')
      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(),
    );
  }
}