前端入门flutter-06 ListView基础列表组件、水平列表组件、图标组件

  1 import ‘package:flutter/material.dart‘;
  2 import ‘res/listData.dart‘;
  3 
  4 void main(){
  5   runApp(new MyApp());
  6 
  7 }
  8 
  9 class MyApp extends StatelessWidget{
 10   @override
 11   Widget build(BuildContext context) {
 12     // TODO: implement build
 13     return MaterialApp(
 14         home:Scaffold(
 15           appBar: AppBar(title: Text("ListView列表组件、动态列表")),
 16           body: HomeContent4(),
 17         ),
 18     //    主题
 19       theme: ThemeData(primarySwatch: Colors.green),
 20     );
 21   }
 22 }
 23 
 24 
 25 // class HomeContent extends StatelessWidget {
 26 // //  自定义方法
 27 // List<Widget> getData(){
 28 //   List<Widget> list = new List();
 29 //   for(var i = 0;i<20;i++){
 30 //     list.add(
 31 //       ListTile(
 32 //         title: Text("我是第$i个列表"),
 33 //       )
 34 //     );
 35 //   }
 36 //   return list;
 37 // }
 38 // @override
 39 //   Widget build(BuildContext context) {
 40 //     // TODO: implement build
 41 //     return ListView(
 42 //       children: this.getData(),
 43 //     );
 44 //   }
 45 // }
 46 
 47 
 48 //ListView.builder
 49 // class HomeContent2 extends StatelessWidget{
 50 // //  自定义方法
 51 // List<Widget> list = new List();
 52 // HomeContent2(){
 53 //   for(var i = 0;i<20;i++){
 54 //     this.list.add(ListTile(
 55 //       title: Text("第二种第$i个列表"),
 56 //     ));
 57 //   }
 58 // }
 59 // @override
 60 //   Widget build(BuildContext context) {
 61 //     // TODO: implement build
 62 //     return ListView.builder(
 63 //         itemCount: this.list.length,
 64 //         itemBuilder: (context,index){
 65 //           return this.list[index];
 66 //         }
 67 //         );
 68 //   }
 69 // }
 70 
 71 //ListView.builder 使用外部资源
 72 class HomeContent4 extends StatelessWidget{
 73 //  自定义方法
 74 Widget _getListData(context,index){
 75   return ListTile(
 76     leading: Image.network(listData[index]["imageUrl"],width: 100.0,),
 77     title: Text(listData[index]["title"]),
 78     subtitle: Text(listData[index]["author"]),
 79   );
 80 }
 81 @override
 82   Widget build(BuildContext context) {
 83     // TODO: implement build
 84     return ListView.builder(
 85         itemCount: listData.length,
 86         itemBuilder:this._getListData//赋值不需要括号
 87 
 88         );
 89   }
 90 }
 91 
 92 //使用外部资源
 93 class HomeContent3 extends StatelessWidget {
 94 //  自定义方法
 95   List<Widget> getData(){
 96 
 97       var  template=listData.map((value){
 98         return ListTile(
 99           leading: Image.network(value["imageUrl"]),
100           title: Text(value["title"]),
101           subtitle: Text(value["author"])
102         );
103       });
104       // (‘123456‘,‘123456‘)
105     return template.toList();
106   }
107   @override
108   Widget build(BuildContext context) {
109     // TODO: implement build
110     return ListView(
111       children: this.getData(),
112     );
113   }
114 }

import ‘package:flutter/material.dart‘;
import ‘package:fluttertoast/fluttertoast.dart‘;
// import ‘package:flutter_app1/main.dart‘;

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
        home: Scaffold(
      appBar: AppBar(title: Text("ListView列表组件、图标组件")),
      body: HomeContent2(),
    ));
  }
}

class HomeContent extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return ListView(padding: EdgeInsets.all(10.0), children: <Widget>[
      ListTile(
        title: Text(
          "据外媒，近日FBI公布了一份清单，并警告称有网络犯罪分子",
          style: TextStyle(fontSize: 24),
        ),
        subtitle: Text("正在使用一系列伪装成FBI的钓鱼网站来窃取用户信息"),
      ),
      ListTile(
        leading: Image.network(
            ‘https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1605168143&di=e92c5258dc948d103b1c85d53fe4f7e4&src=http://a0.att.hudong.com/30/29/01300000201438121627296084016.jpg‘),
        title: Text("据外媒，近日FBI公布了一份清单，并警告称有网络犯罪分子"),
        subtitle: Text("正在使用一系列伪装成FBI的钓鱼网站来窃取用户信息"),
        trailing: Image.network(
            ‘https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1605168143&di=e92c5258dc948d103b1c85d53fe4f7e4&src=http://a0.att.hudong.com/30/29/01300000201438121627296084016.jpg‘),
      ),
      ListTile(
        leading: Icon(Icons.add_road, size: 40.0, color: Colors.red),
        title: Text("据外媒，近日FBI公布了一份清单，并警告称有网络犯罪分子"),
        subtitle: Text("正在使用一系列伪装成FBI的钓鱼网站来窃取用户信息"),
        trailing: Icon(Icons.add_road, size: 40.0, color: Colors.red),
      ),
      ListTile(
        title: Text("据外媒，近日FBI公布了一份清单，并警告称有网络犯罪分子"),
        subtitle: Text("正在使用一系列伪装成FBI的钓鱼网站来窃取用户信息"),
      ),
      ListTile(
        title: Text("据外媒，近日FBI公布了一份清单，并警告称有网络犯罪分子"),
        subtitle: Text("正在使用一系列伪装成FBI的钓鱼网站来窃取用户信息"),
      ),
      ListTile(
        title: Text("据外媒，近日FBI公布了一份清单，并警告称有网络犯罪分子"),
        subtitle: Text("正在使用一系列伪装成FBI的钓鱼网站来窃取用户信息"),
      ),
    ]);
  }
}

//listview中使用其他的widgets
class HomeContent2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return ListView(
      padding: EdgeInsets.all(10.0),
      children: [
        Container(
          child: Text(
            ‘杰克快讯‘,
            textAlign: TextAlign.center,
            style: TextStyle(
              fontSize: 28.0,
            ),
          ),
          // height: 60.0,
        ),
        IconDemo(),
        Image.network(
            ‘https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=547210280,4023660930&fm=26&gp=0.jpg‘),
        Container(
          child: Text(
            ‘杰克快讯‘,
            textAlign: TextAlign.center,
            style: TextStyle(
              fontSize: 28.0,
            ),
          ),
          height: 60.0,
        ),
        Image.network(
            ‘https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=547210280,4023660930&fm=26&gp=0.jpg‘),
        Container(
          child: Text(
            ‘杰克快讯‘,
            textAlign: TextAlign.center,
            style: TextStyle(
              fontSize: 28.0,
            ),
          ),
          height: 60.0,
        ),
        Image.network(
            ‘https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=547210280,4023660930&fm=26&gp=0.jpg‘),
        Container(
          child: Text(
            ‘杰克快讯‘,
            textAlign: TextAlign.center,
            style: TextStyle(
              fontSize: 28.0,
            ),
          ),
          height: 60.0,
        ),
        Image.network(
            ‘https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=547210280,4023660930&fm=26&gp=0.jpg‘)
      ],
    );
  }
}

//listview水平列表
class HomeContent3 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Container(
      height: 180.0,
      child: ListView(
        scrollDirection: Axis.horizontal,
        children: [
          Container(
            width: 180.0,
            height: 100.0,
            color: Colors.red,
            child: ListView(
              children: [
                Container(
                  child: Text(
                    ‘橙色年华‘,
                    style: TextStyle(color: Colors.white),
                  ),
                ),
                Image.network(
                    ‘https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1605168143&di=e92c5258dc948d103b1c85d53fe4f7e4&src=http://a0.att.hudong.com/30/29/01300000201438121627296084016.jpg‘)
              ],
            ),
          ),
          Container(
            width: 180.0,
            height: 100.0,
            color: Colors.yellowAccent,
          ),
          Container(
            width: 180.0,
            height: 100.0,
            color: Colors.lightBlue,
          ),
          Container(
            width: 180.0,
            height: 100.0,
            color: Colors.greenAccent,
          ),
          Container(
            width: 180.0,
            height: 100.0,
            color: Colors.deepPurple,
          ),
          Container(
            width: 180.0,
            height: 100.0,
            color: Colors.black26,
          ),
          Container(
            width: 180.0,
            height: 100.0,
            color: Colors.deepOrange,
          ),
        ],
      ),
    );
  }
}

//icon组件

class IconDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new Center(
      child: new Icon(
        Icons.android_outlined,
        color: Colors.redAccent,
        size: 150.0,
      ),
    );
  }
}

//