05-06 Flutter JSON和序列化反序列化、创建模型类转换Json数据、轮播图数据渲染:Flutter创建商品数据模型 、请求Api接口渲染热门商品 推荐商品

Config.dart

class Config{
  static String domain='http://jd.itying.com/';
}

　　FocusModel.dart

class FocusModel {
 List<FocusItemModel> result;

  FocusModel({this.result});

  FocusModel.fromJson(Map<String, dynamic> json) {
    if (json['result'] != null) {
      result = new List<FocusItemModel>();
      json['result'].forEach((v) {
        result.add(new FocusItemModel.fromJson(v));
      });
    }
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    if (this.result != null) {
      data['result'] = this.result.map((v) => v.toJson()).toList();
    }
    return data;
  }
}

class FocusItemModel {
  String sId;
  String title;
  String status;
  String pic;
  String url;

  FocusItemModel({this.sId, this.title, this.status, this.pic, this.url});

  FocusItemModel.fromJson(Map<String, dynamic> json) {
    sId = json['_id'];
    title = json['title'];
    status = json['status'];
    pic = json['pic'];
    url = json['url'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['_id'] = this.sId;
    data['title'] = this.title;
    data['status'] = this.status;
    data['pic'] = this.pic;
    data['url'] = this.url;
    return data;
  }
}

　　ProductModel.dart

class ProductModel {
  List<ProductItemModel> result;

  ProductModel({this.result});

  ProductModel.fromJson(Map<String, dynamic> json) {
    if (json['result'] != null) {
      result = new List<ProductItemModel>();
      json['result'].forEach((v) {
        result.add(new ProductItemModel.fromJson(v));
      });
    }
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    if (this.result != null) {
      data['result'] = this.result.map((v) => v.toJson()).toList();
    }
    return data;
  }
}

class ProductItemModel {
  String sId;
  String title;
  String cid;
  Object price;
  String oldPrice;
  String pic;
  String sPic;

  ProductItemModel(
      {this.sId,
      this.title,
      this.cid,
      this.price,
      this.oldPrice,
      this.pic,
      this.sPic});

  ProductItemModel.fromJson(Map<String, dynamic> json) {
    sId = json['_id'];
    title = json['title'];
    cid = json['cid'];
    price = json['price'];
    oldPrice = json['old_price'];
    pic = json['pic'];
    sPic = json['s_pic'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['_id'] = this.sId;
    data['title'] = this.title;
    data['cid'] = this.cid;
    data['price'] = this.price;
    data['old_price'] = this.oldPrice;
    data['pic'] = this.pic;
    data['s_pic'] = this.sPic;
    return data;
  }
}

　　Home.dart

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

// import 'dart:convert';
import '../../config/Config.dart';
import 'package:dio/dio.dart';

//轮播图类模型：
import '../../model/FocusModel.dart';

//热门推荐：
import '../../model/ProductModel.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：
  List _focusData = [];
  List _hotProductList = [];
  List _bestProductList = [];
  void initState() {
    super.initState();
    _getFocusData();
    _getHotProductData();
    _getBestProductData();
  }

  //获取轮播图数据：
  _getFocusData() async {
    var api = '${Config.domain}/api/focus';
    var result = await Dio().get(api);
    var focusList = FocusModel.fromJson(result.data);
    focusList.result.forEach((value) {
      print(value.title);
      print(value.pic);
    });
    setState(() {
      this._focusData = focusList.result;
    });
  }

  //获取猜你喜欢的数据：
  _getHotProductData() async {
    var api = '${Config.domain}api/plist?is_hot=1';
    var result = await Dio().get(api);
    var hotProductList = ProductModel.fromJson(result.data);
    setState(() {
      this._hotProductList = hotProductList.result;
    });
  }

  //获取热门推荐的数据：
  _getBestProductData() async {
    var api = '${Config.domain}api/plist?is_best=1';
    var result = await Dio().get(api);
    var bestProductList = ProductModel.fromJson(result.data);
    setState(() {
      this._bestProductList = bestProductList.result;
    });
  }

  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"}
    // ];
    if (this._focusData.length > 0) {
      return Container(
        child: AspectRatio(
          aspectRatio: 2 / 1,
          child: Swiper(
            itemBuilder: (BuildContext context, int index) {
              String pic = this._focusData[index].pic;
              pic = Config.domain + pic.replaceAll('\', '/');
              return new Image.network(
                "${pic}",
                fit: BoxFit.fill,
              );
            },
            itemCount: this._focusData.length,
            pagination: new SwiperPagination(),
            control: new SwiperControl(),
            autoplay: true,
          ),
        ),
      );
    } else {
      return Text('加载中~');
    }
  }

  //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() {
    if (this._hotProductList.length > 0) {
      return Container(
        height: ScreenAdaper.height(240),
        padding: EdgeInsets.all(ScreenAdaper.width(20)),
        //  double.infinity, //寬度自適應
        child: ListView.builder(
          scrollDirection: Axis.horizontal,
          itemBuilder: (contxt, index) {
            String sPic = this._hotProductList[index].sPic;
            sPic = Config.domain + sPic.replaceAll('\', '/');
            return Column(
              children: <Widget>[
                Container(
                  height: ScreenAdaper.height(140),
                   ScreenAdaper.width(140),
                  margin: EdgeInsets.only(right: ScreenAdaper.width(21)),
                  child: Image.network("${sPic}", fit: BoxFit.cover),
                ),
                Container(
                  padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
                  height: ScreenAdaper.height(44),
                  child: Text(
                    '${this._hotProductList[index].price}',
                    style: TextStyle(color: Colors.red),
                  ),
                )
              ],
            );
          },
          itemCount: this._hotProductList.length,
        ),
      );
    } else {
      return Text('暂无热门推荐数据');
    }
  }

  Widget _recProductListWidget() {
    var itemWidth = (ScreenAdaper.getScreenWidth() - 30) / 2;
    return Container(
      padding: EdgeInsets.all(10),
      child: Wrap(
        runSpacing: 10,
        spacing: 10,
        children: this._bestProductList.map((value) {
          //图片：
          var sPic = value.sPic;
          sPic = Config.domain + sPic.replaceAll('\', '/');

          return Container(
            padding: EdgeInsets.all(ScreenAdaper.width(20)),
             itemWidth,
            decoration: BoxDecoration(
                border: Border.all(color: Colors.black12,  1)),
            child: Column(
              children: <Widget>[
                Container(
                   double.infinity,
                  child: AspectRatio(
                    aspectRatio: 1 / 1,
                    child: Image.network("${sPic}", fit: BoxFit.cover),
                  ),
                ),
                Padding(
                  padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
                  child: Text(
                    "${value.title}",
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                    style: TextStyle(color: Colors.black54),
                  ),
                ),
                Padding(
                  padding: EdgeInsets.only(top: ScreenAdaper.height(20)),
                  child: Stack(
                    children: <Widget>[
                      Align(
                        alignment: Alignment.centerLeft,
                        child: Text(
                          "${value.price}",
                          style: TextStyle(color: Colors.red, fontSize: 16),
                        ),
                      ),
                      Align(
                        alignment: Alignment.centerRight,
                        child: Text(
                          "￥${value.oldPrice}",
                          style: TextStyle(
                              color: Colors.black54,
                              fontSize: 16,
                              decoration: TextDecoration.lineThrough),
                        ),
                      )
                    ],
                  ),
                )
              ],
            ),
          );
        }).toList(),
      ),
    );
  }

  @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"),
        _recProductListWidget()
      ],
    );
  }
}

增加依赖：

dio: ^2.1.10