Flutter移动电商实战 --（28）列表页_商品列表后台接口调试

主要调试商品列表页的接口

这个接口是最难的因为有大类、小类还有上拉加载

先配置接口

config/service_url.dart

//const serviceUrl='http://test.baixingliangfan.cn/baixing/';//2019-04-12失效
const serviceUrl='https://wxmini.baixingliangfan.cn/baixing/';//从群里那个github的地址找到的
const servicePath={
  'homePageContent':serviceUrl+'wxmini/homePageContent',//商店首页信息
  'homePageBelowConten':serviceUrl+'wxmini/homePageBelowConten',//商城首页热卖商品
  'getCategory':serviceUrl+'wxmini/getCategory',//商品类别信息
  'getMallGoods':serviceUrl+'wxmini/getMallGoods',//商品分类的商品列表
};

编写新类调试接口

stful快生生成widget.CategoryGoodsList

然后写一个内部方法，调用我们的后端接口

然后需要调用这个内部方法

在我们的initState里面调用

然后把我们的商品列表放到右边的Column的下边调用。

运行页面，可以看到后台输出的数据。这样就说明我的接口已经调通了。

最终源码：

category_page.dart

import 'package:flutter/material.dart';
import '../service/service_method.dart';
import 'dart:convert';
import '../model/category.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:provide/provide.dart';
import '../provide/child_category.dart';

class CategoryPage extends StatefulWidget {
  @override
  _CategoryPageState createState() => _CategoryPageState();
}

class _CategoryPageState extends State<CategoryPage> {
  @override
  Widget build(BuildContext context) {
    //_getCategory();
    return Scaffold(
      appBar: AppBar(title: Text('商品分类'),),
      body: Container(
        child: Row(
          children: <Widget>[
            LeftCategoryNav(),
            Column(
              children: <Widget>[
                RightCategoryNav(),
                CategoryGoodsList()
              ],
            )
          ],
        ),
      ),
    );
  }

 
}

//左侧大类导航
class LeftCategoryNav extends StatefulWidget {
  @override
  _LeftCategoryNavState createState() => _LeftCategoryNavState();
}

class _LeftCategoryNavState extends State<LeftCategoryNav> {
  List list=[];
  var listIndex=0;
  @override
  void initState() { 
    super.initState();
    _getCategory();//请求接口的数据
  }
  @override
  Widget build(BuildContext context) {
    return Container(
       ScreenUtil().setWidth(180),
      decoration: BoxDecoration(
        border: Border(
          right: BorderSide(1.0,color: Colors.black12),//有边框
        )
      ),
      child: ListView.builder(
        itemCount: list.length,
        itemBuilder: (contex,index){
          return _leftInkWell(index);
        },
      ),
    );
  }

  Widget _leftInkWell(int index){
    bool isClick=false;
    isClick=(index==listIndex)?true:false;
    return InkWell(
      onTap: (){
        setState(() {
         listIndex=index; 
        });
        var childList=list[index].bxMallSubDto;//当前大类的子类的列表
        Provide.value<ChildCategory>(context).getChildCategory(childList);
      },
      child: Container(
        height: ScreenUtil().setHeight(100),
        padding: EdgeInsets.only(left:10.0,top:10.0),
        decoration: BoxDecoration(
          color: isClick?Color.fromRGBO(236, 236, 236, 1.0): Colors.white,
          border: Border(
            bottom: BorderSide( 1.0,color: Colors.black12)
          )
        ),
        child: Text(
          list[index].mallCategoryName,
          style: TextStyle(fontSize: ScreenUtil().setSp(28)),//设置字体大小，为了兼容使用setSp
        ),
      ),
    );
  }
   void _getCategory() async{
    await request('getCategory').then((val){
      var data=json.decode(val.toString());
      //print(data);
      CategoryModel category= CategoryModel.fromJson(data);
      setState(() {
       list=category.data; 
      });
      Provide.value<ChildCategory>(context).getChildCategory(list[0].bxMallSubDto);
    });
  }
}

class RightCategoryNav extends StatefulWidget {
  @override
  _RightCategoryNavState createState() => _RightCategoryNavState();
}

class _RightCategoryNavState extends State<RightCategoryNav> {
  //List list = ['名酒','宝丰','北京二锅头','舍得','五粮液','茅台','散白'];
  @override
  Widget build(BuildContext context) {
    return Provide<ChildCategory>(
      builder: (context,child,childCategory){
        return  Container(
          height: ScreenUtil().setHeight(80),
           ScreenUtil().setWidth(570),//总的宽度是750 -180
          decoration: BoxDecoration(
            color: Colors.white,//白色背景
            border: Border(
              bottom: BorderSide( 1.0,color: Colors.black12)//边界线
            )
          ),
          child: ListView.builder(
            scrollDirection: Axis.horizontal,
            itemCount: childCategory.childCategoryList.length,
            itemBuilder: (context,index){
              return _rightInkWell(childCategory.childCategoryList[index]);
            },
          ),
        );
      }
    );
  }

  Widget _rightInkWell(BxMallSubDto item){
    return InkWell(
      onTap: (){},//事件留空
      child: Container(//什么都加一个container，这样好布局
        padding: EdgeInsets.fromLTRB(5.0, 10.0, 5.0, 10.0),//上下是10 左右是5.0
        child: Text(
          item.mallSubName,
          style:TextStyle(fontSize: ScreenUtil().setSp(28)),
        ),
      ),
    );
  }
}

//商品列表 ，可以上拉加载
class CategoryGoodsList extends StatefulWidget {
  @override
  _CategoryGoodsListState createState() => _CategoryGoodsListState();
}

class _CategoryGoodsListState extends State<CategoryGoodsList> {
  @override
  void initState() {
    _getGoodsList();
    super.initState();
  }
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Text('商品列表'),
    );
  }
  void _getGoodsList() async {
    var data={
      'categoryId':4,//白酒的默认类别
      'CategorySubId':"",
      'page':1
    };
    await request('getMallGoods',formData: data).then((val){
      var data=json.decode(val.toString());
      print('分类商品列表》》》》》》》》》》》${val}');
    });
  }
}

.