03Flutter仿京东商城项目 封装适配库以及实现左右滑动ListView

ScreenAdaper.dart

import 'package:flutter_screenutil/flutter_screenutil.dart';

class ScreenAdaper {
  //
  static init(context) {
    ScreenUtil.instance = ScreenUtil( 750, height: 1334)..init(context);
  }

  static height(double value) {
    return ScreenUtil.getInstance().setHeight(value);
  }

  static width(double value) {
    return ScreenUtil.getInstance().setWidth(value);
  }

  static getScreenHeight() {
    return ScreenUtil.screenHeightDp;
  }

  static getScreenWidth() {
    return ScreenUtil.screenWidthDp;
  }
}
/*  */

　Home.dart

　

import 'package:flutter/material.dart';
import 'package:flutter_swiper/flutter_swiper.dart';
import '../../services/ScreenAdaper.dart';

class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  //轮播图：
  //flutter run -d all 链接多个设备的命令：
  Widget _swiperWidget() {
    List<Map> imgList = [
      {"url": "https://www.itying.com/images/flutter/slide01.jpg"},
      {"url": "https://www.itying.com/images/flutter/slide02.jpg"},
      {"url": "https://www.itying.com/images/flutter/slide03.jpg"}
    ];

    return Container(
      child: AspectRatio(
        aspectRatio: 2 / 1,
        child: Swiper(
          itemBuilder: (BuildContext context, int index) {
            return new Image.network(
              imgList[index]['url'],
              fit: BoxFit.fill,
            );
          },
          itemCount: imgList.length,
          pagination: new SwiperPagination(),
          control: new SwiperControl(),
          autoplay: true,
        ),
      ),
    );
  }

  //标题：
  Widget _titleWidget(value) {
    return Container(
      height: ScreenAdaper.height(46),
      margin: EdgeInsets.only(left: ScreenAdaper.width(20)),
      padding: EdgeInsets.only(left: ScreenAdaper.width(20)),
      decoration: BoxDecoration(
          border: Border(
              left: BorderSide(
                  color: Colors.red,  ScreenAdaper.width(10)))),
      child: Text(value, style: TextStyle(color: Colors.black54)),
    );
  }

  //热门商品：
  Widget _hotProductListWidget() {
    return Container(
      height: ScreenAdaper.height(240),
      padding: EdgeInsets.all(ScreenAdaper.width(10)),
      //  double.infinity, //寬度自適應
      child: ListView.builder(
        scrollDirection: Axis.horizontal,
        itemBuilder: (contxt, index) {
          return Column(
            children: <Widget>[
              Container(
                height: ScreenAdaper.height(140),
                 ScreenAdaper.width(140),
                margin: EdgeInsets.only(right:ScreenAdaper.width(21)),

                child: Image.network('https://www.itying.com/images/flutter/hot${index+1}.jpg',fit:BoxFit.cover),
              ),
              Container(
                padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
                height: ScreenAdaper.height(44),
                child: Text('第${index}条'),
              )
            ],
          );
        },
        itemCount: 9,
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    ScreenAdaper.init(context);
    return ListView(
      children: <Widget>[
        _swiperWidget(),
        SizedBox(height: ScreenAdaper.height(20)),
        _titleWidget("猜你喜欢"),

        _hotProductListWidget(),
        SizedBox(height: ScreenAdaper.height(20)),
        _titleWidget("热门推荐"),
        
      ],
    );
  }
}