购物车（完整版）郭总的购物车布局比较low死数据，如果想要高端的请往上移步三层

依赖就不用说了

下面先来布局吧

activity_main

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.daydayup.day14_gouwuche.view.MainActivity">

    <ExpandableListView
        android:id="@+id/expandable_list_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:groupIndicator="@null"
        android:layout_weight="1"></ExpandableListView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <CheckBox
            android:id="@+id/cb"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/tv_sum"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="合计:0" />

        <Button
            android:id="@+id/jisuan"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#F00"
            android:text="去结算（0）" />
    </LinearLayout>
</LinearLayout>

add_layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:background="@drawable/add_shape"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <TextView
        android:gravity="center"
        android:id="@+id/sub"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@drawable/add_shape"
        android:text="-" />

    <EditText

        android:id="@+id/count"
        android:layout_width="50dp"
        android:layout_height="30dp"
        android:background="@null" />

    <TextView
        android:gravity="center"
        android:id="@+id/add"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@drawable/add_shape"
        android:text="+" />
</LinearLayout>

item_child

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <CheckBox
        android:id="@+id/child_cb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/child_pic"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@mipmap/ic_launcher" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/child_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:text="商品名"
            android:textSize="25sp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/child_price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:text="商品价格"
                android:textColor="#F00" />

            <com.daydayup.day14_gouwuche.view.custumviews.AddSubView
                android:layout_width="100dp"
                android:id="@+id/addSubView"
                android:layout_height="30dp"></com.daydayup.day14_gouwuche.view.custumviews.AddSubView>
        </LinearLayout>

    </LinearLayout>
    <TextView
        android:id="@+id/dele"
        android:background="#F00"
        android:text="删除"
        android:gravity="center"
        android:layout_width="50dp"
        android:layout_height="match_parent" />

</LinearLayout>

item_parent

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <CheckBox
        android:id="@+id/parent_cb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/parent_title"
        android:text="商家"
        android:singleLine="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_conten	t" />

</LinearLayout>

drawable文件下

add_shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <size
        android:width="100dp"
        android:height="30dp" />
    <stroke
        android:width="1dp"
        android:color="#999999" />

</shape>

Modle层开始

GouWuBean

package com.daydayup.day14_gouwuche.model;

import java.util.List;

/**
 * Created by gjl on 2018/4/25.
 */

public class GouWuBean {

    /**
     * msg : 请求成功
     * code : 0
     * data : [{"list":[],"sellerName":"","sellerid":"0"},{"list":[{"bargainPrice":11800,"createtime":"2017-10-10T17:33:37","detailUrl":"https://item.m.jd.com/product/4338107.htmlChildBeanutm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t6700/155/2098998076/156185/6cf95035/595dd5a5Nc3a7dab5.jpg!q70.jpg","num":2,"pid":57,"price":5199,"pscid":40,"selected":0,"sellerid":1,"subhead":"【i5 MX150 2G显存】全高清窄边框 8G内存 256固态硬盘 支持指纹识别 预装WIN10系统","title":"小米(MI)Air 13.3英寸全金属轻薄笔记本(i5-7200U 8G 256G PCle SSD MX150 2G独显 FHD 指纹识别 Win10）银 "}],"sellerName":"商家1","sellerid":"1"},{"list":[{"bargainPrice":3455,"createtime":"2017-10-03T23:53:28","detailUrl":"https://item.m.jd.com/product/12224420750.htmlChildBeanutm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t9106/106/1785172479/537280/253bc0ab/59bf78a7N057e5ff7.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t9106/106/1785172479/537280/253bc0ab/59bf78a7N057e5ff7.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t8461/5/1492479653/68388/7255e013/59ba5e84N91091843.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t8461/5/1492479653/68388/7255e013/59ba5e84N91091843.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t8803/356/1478945529/489755/2a163ace/59ba5e84N7bb9a666.jpg!q70.jpg","num":5,"pid":54,"price":888,"pscid":39,"selected":0,"sellerid":10,"subhead":"【现货新品抢购】全面屏2.0震撼来袭，骁龙835处理器，四曲面陶瓷机","title":"小米（MI） 小米MIX2 手机 黑色 全网通 (6GB+64GB)【标配版】"}],"sellerName":"商家10","sellerid":"10"},{"list":[{"bargainPrice":3455,"createtime":"2017-10-14T21:38:26","detailUrl":"https://item.m.jd.com/product/12224420750.htmlChildBeanutm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t9106/106/1785172479/537280/253bc0ab/59bf78a7N057e5ff7.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t9106/106/1785172479/537280/253bc0ab/59bf78a7N057e5ff7.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t8461/5/1492479653/68388/7255e013/59ba5e84N91091843.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t8461/5/1492479653/68388/7255e013/59ba5e84N91091843.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t8803/356/1478945529/489755/2a163ace/59ba5e84N7bb9a666.jpg!q70.jpg","num":1,"pid":56,"price":99,"pscid":39,"selected":0,"sellerid":12,"subhead":"【现货新品抢购】全面屏2.0震撼来袭，骁龙835处理器，四曲面陶瓷机","title":"小米（MI） 小米MIX2 手机 黑色 全网通 (6GB+64GB)【标配版】"},{"bargainPrice":11800,"createtime":"2017-10-14T21:48:08","detailUrl":"https://mitem.jd.hk/ware/view.actionChildBeanwareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1","images":"https://m.360buyimg.com/n0/jfs/t6130/97/1370670410/180682/1109582a/593276b1Nd81fe723.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5815/178/2614671118/51656/7f52d137/593276c7N107b725a.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5878/60/2557817477/30873/4502b606/593276caN5a7d6357.jpg!q70.jpg","num":1,"pid":68,"price":15000,"pscid":40,"selected":0,"sellerid":12,"subhead":"购买电脑办公部分商品满1元返火车票5元优惠券（返完即止）","title":"全球购 新款Apple MacBook Pro 苹果笔记本电脑 银色VP2新13英寸Bar i5/8G/256G"}],"sellerName":"商家12","sellerid":"12"}]
     */

    private String msg;
    private String code;
    private List<DataBean> data;

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }
    //商家
    public static class DataBean {
        /**
         * list : []
         * sellerName :
         * sellerid : 0
         */

        private String sellerName;
        private String sellerid;
        private List<ChildBean> list;
        //状态
        private boolean parent_flag;

        public boolean isParent_flag() {
            return parent_flag;
        }

        public void setParent_flag(boolean parent_flag) {
            this.parent_flag = parent_flag;
        }

        public String getSellerName() {
            return sellerName;
        }

        public void setSellerName(String sellerName) {
            this.sellerName = sellerName;
        }

        public String getSellerid() {
            return sellerid;
        }

        public void setSellerid(String sellerid) {
            this.sellerid = sellerid;
        }

        public List<ChildBean> getList() {
            return list;
        }

        public void setList(List<ChildBean> list) {
            this.list = list;
        }
    }
    public class ChildBean{

        /**
         * bargainPrice : 11800
         * createtime : 2017-10-10T17:33:37
         * detailUrl : https://item.m.jd.com/product/4338107.htmlChildBeanutm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends
         * images : https://m.360buyimg.com/n0/jfs/t6700/155/2098998076/156185/6cf95035/595dd5a5Nc3a7dab5.jpg!q70.jpg
         * num : 2
         * pid : 57
         * price : 5199
         * pscid : 40
         * selected : 0
         * sellerid : 1
         * subhead : 【i5 MX150 2G显存】全高清窄边框 8G内存 256固态硬盘 支持指纹识别 预装WIN10系统
         * title : 小米(MI)Air 13.3英寸全金属轻薄笔记本(i5-7200U 8G 256G PCle SSD MX150 2G独显 FHD 指纹识别 Win10）银
         */

        private double bargainPrice;
        private String createtime;
        private String detailUrl;
        private String images;
        private int num;
        private int pid;
        private double price;
        private int pscid;
        private int selected;
        private int sellerid;
        private String subhead;
        private String title;

        //是否选中的状态
        private boolean child_flag;

        public boolean isChild_flag() {
            return child_flag;
        }

        public void setChild_flag(boolean child_flag) {
            this.child_flag = child_flag;
        }

        public double getBargainPrice() {
            return bargainPrice;
        }

        public void setBargainPrice(double bargainPrice) {
            this.bargainPrice = bargainPrice;
        }

        public String getCreatetime() {
            return createtime;
        }

        public void setCreatetime(String createtime) {
            this.createtime = createtime;
        }

        public String getDetailUrl() {
            return detailUrl;
        }

        public void setDetailUrl(String detailUrl) {
            this.detailUrl = detailUrl;
        }

        public String getImages() {
            return images;
        }

        public void setImages(String images) {
            this.images = images;
        }

        public int getNum() {
            return num;
        }

        public void setNum(int num) {
            this.num = num;
        }

        public int getPid() {
            return pid;
        }

        public void setPid(int pid) {
            this.pid = pid;
        }

        public double getPrice() {
            return price;
        }

        public void setPrice(double price) {
            this.price = price;
        }

        public int getPscid() {
            return pscid;
        }

        public void setPscid(int pscid) {
            this.pscid = pscid;
        }

        public int getSelected() {
            return selected;
        }

        public void setSelected(int selected) {
            this.selected = selected;
        }

        public int getSellerid() {
            return sellerid;
        }

        public void setSellerid(int sellerid) {
            this.sellerid = sellerid;
        }

        public String getSubhead() {
            return subhead;
        }

        public void setSubhead(String subhead) {
            this.subhead = subhead;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }
    }
}

IModel

package com.daydayup.day14_gouwuche.model;

import java.util.List;
import java.util.Map;

/**
 * Model
 *
 *      MVP
 *          m---获取数据
 *          v---显示视图
 *          p---逻辑
 *
 */

public interface IModel {
    //获取购物车数据
    void getGouWuCheData(String url, Map<String,String> map,GouWuCheListener gouWuCheListener);
    //计算总价
    void jisuan(List<GouWuBean.DataBean> list,JiSuanListener jiSuanListener);
}

ModelImpl

package com.daydayup.day14_gouwuche.model;

import android.util.Log;

import com.daydayup.day14_gouwuche.http.HttpUtils;
import com.daydayup.day14_gouwuche.http.OkLoadListener;

import java.util.List;
import java.util.Map;

/**
 * Created by gjl on 2018/4/25.
 */

public class ModelImpl implements IModel {
    private static final String TAG = "ModelImpl---";
    @Override
    public void getGouWuCheData(String url, Map<String, String> map, final GouWuCheListener gouWuCheListener) {
        HttpUtils httpUtils = HttpUtils.getHttpUtils();
        httpUtils.okPost(url, map);
        httpUtils.setOkLoadListener(new OkLoadListener() {
            @Override
            public void okLoadSuccess(String json) {
                Log.d(TAG, "okLoadSuccess: "+json);
                gouWuCheListener.getDataSuccess(json);
            }

            @Override
            public void okLoadError(String error) {
                Log.d(TAG, "okLoadError: "+error);
                gouWuCheListener.getDataError(error);
            }
        });
    }

    @Override
    public void jisuan(List<GouWuBean.DataBean> list, JiSuanListener jiSuanListener) {
        double sum = 0;
        for (int i = 0; i < list.size(); i++) {
            List<GouWuBean.ChildBean> list_child = list.get(i).getList();
            for (int j = 0; j < list_child.size(); j++) {
                boolean child_flag = list_child.get(j).isChild_flag();
                if (child_flag){
                    double price = list_child.get(j).getPrice();
                    sum+=price;
                }

            }
        }
        //记得回调
        jiSuanListener.jiSuan(sum);
    }
}

JiSuanListener

public interface JiSuanListener {
    void jiSuan(double price);
}

AddSubView

package com.daydayup.day14_gouwuche.view.custumviews;

import android.content.Context;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.daydayup.day14_gouwuche.R;

/**
 * Created by gjl on 2018/4/26.
 */

public class AddSubView extends LinearLayout implements View.OnClickListener {

    private TextView add;
    private TextView sub;
    private EditText count;

    public AddSubView(Context context) {
        this(context, null);
    }

    public AddSubView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AddSubView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        View view = View.inflate(context, R.layout.add_layout, this);
        add = view.findViewById(R.id.add);
        sub = view.findViewById(R.id.sub);

        add.setOnClickListener(this);
        sub.setOnClickListener(this);
        count = view.findViewById(R.id.count);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.add:
                add();
                break;

            case R.id.sub:
                sub();
                break;
        }
    }

    //添加
    public void add() {
        String s = count.getText().toString();
        double i = Double.parseDouble(s);
        i++;
        count.setText(i + "");
    }

    //减少
    public void sub() {
        String s = count.getText().toString();
        double i = Double.parseDouble(s);
        if (i >= 1) {
            i--;
            count.setText(i + "");
        }

    }
    //设置数量

    //获取数量
    public String getCount() {
        return count.getText().toString();
    }

    public void setCount(double count1){
        count.setText(count1+"");
    }

}

IMainView

package com.daydayup.day14_gouwuche.view;

import com.daydayup.day14_gouwuche.model.GouWuBean;

import java.util.List;

/**
 * View接口
 */

public interface IMainView {
    //显示数据
    void showGowWuList(List<GouWuBean.DataBean> list);
    //显示总价
    void showSum(double price);
    //获取集合数据
    List<GouWuBean.DataBean> getList();
}

IPresenter

public interface IPresenter {
    void showGouWuCheToView(IModel iModel, IMainView iMainView);
    //将计算结果显示到view
    void showSumToView(IModel iModel, IMainView iMainView);
}

PresenterImpl

public class PresenterImpl implements IPresenter {
    private static final String TAG = "PresenterImpl----";

    //显示数据
    @Override
    public void showGouWuCheToView(IModel iModel, final IMainView iMainView) {
        Map<String, String> map = new HashMap<>();
        map.put("uid", "71");
        iModel.getGouWuCheData(HttpConfig.gouwuche_url, map, new GouWuCheListener() {

            @Override
            public void getDataSuccess(String json) {
                Gson gson = new Gson();
                GouWuBean gouWuBean = gson.fromJson(json, GouWuBean.class);
                List<GouWuBean.DataBean> list = gouWuBean.getData();
                //传入view
                iMainView.showGowWuList(list);
            }

            @Override
            public void getDataError(String error) {
                Log.d(TAG, "error: " + error);
            }
        });
    }
    //显示计算结果
    @Override
    public void showSumToView(IModel iModel, final IMainView iMainView) {
        iModel.jisuan(iMainView.getList(), new JiSuanListener() {
            @Override
            public void jiSuan(double price) {
                iMainView.showSum(price);
            }
        });
    }
}

MyAdapter

public class MyAdapter extends BaseExpandableListAdapter {
    private Context context;
    private List<GouWuBean.DataBean> list;
    private IMainView iMainView;

    public MyAdapter(Context context, List<GouWuBean.DataBean> list, IMainView iMainView) {
        this.list = list;
        this.context = context;
        this.iMainView = iMainView;
    }

    @Override
    public int getGroupCount() {
        return list.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return list.get(groupPosition).getList().size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return list.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return list.get(groupPosition).getList().get(childPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

        ParentViewHolder parentViewHolder = null;
        if (convertView == null) {
            convertView = View.inflate(context, R.layout.item_parent, null);
            CheckBox checkBox = convertView.findViewById(R.id.parent_cb);
            TextView textView = convertView.findViewById(R.id.parent_title);
            parentViewHolder = new ParentViewHolder(checkBox, textView);

            convertView.setTag(parentViewHolder);
        } else {
            parentViewHolder = (ParentViewHolder) convertView.getTag();
        }
        //赋值
        parentViewHolder.getParent_tv().setText(list.get(groupPosition).getSellerName());
        parentViewHolder.getParent_cb().setChecked(list.get(groupPosition).isParent_flag());
        //单选框的点击事件
        final ParentViewHolder finalParentViewHolder = parentViewHolder;
        //点击事件
        parentViewHolder.getParent_cb().setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                boolean isChecked = finalParentViewHolder.getParent_cb().isChecked();
                //改变bean里面的值
                list.get(groupPosition).setParent_flag(isChecked);

                //给子列表赋值
                List<GouWuBean.ChildBean> list_child = MyAdapter.this.list.get(groupPosition).getList();

                for (int i = 0; i < list_child.size(); i++) {
                    GouWuBean.ChildBean childBean = list_child.get(i);
                    //改变bean里面的值
                    childBean.setChild_flag(isChecked);
                }

                notifyDataSetChanged();

                //调用计算的方法
                PresenterImpl presenter = new PresenterImpl();
                presenter.showSumToView(new ModelImpl(), iMainView);

            }
        });

        return convertView;
    }

    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildViewHolder childViewHolder = null;
        if (convertView == null) {
            convertView = View.inflate(context, R.layout.item_child, null);
            CheckBox child_cb = convertView.findViewById(R.id.child_cb);
            TextView child_title = convertView.findViewById(R.id.child_title);
            TextView dele = convertView.findViewById(R.id.dele);
            ImageView child_pic = convertView.findViewById(R.id.child_pic);
            TextView tv_price = convertView.findViewById(R.id.child_price);
            AddSubView addSubView = convertView.findViewById(R.id.addSubView);

            childViewHolder = new ChildViewHolder(child_cb, child_pic, child_title, tv_price, addSubView, dele);

            convertView.setTag(childViewHolder);
        } else {
            childViewHolder = (ChildViewHolder) convertView.getTag();
        }
        //赋值
        final List<GouWuBean.ChildBean> child_list = this.list.get(groupPosition).getList();
        childViewHolder.getChild_title().setText(child_list.get(childPosition).getTitle());
        childViewHolder.getChild_price().setText(child_list.get(childPosition).getPrice() + "");
        //给单选框赋值
        childViewHolder.getChild_cb().setChecked(child_list.get(childPosition).isChild_flag());
        String images = child_list.get(childPosition).getImages();
        String pic_url = images.split("\\|")[0];

        Glide.with(context).load(pic_url).into(childViewHolder.getChild_pic());

        childViewHolder.getAddSubView().setCount(child_list.get(childPosition).getNum());

        //字条目单选框的点击事件
        final ChildViewHolder finalChildViewHolder = childViewHolder;
        childViewHolder.getChild_cb().setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //获取当前条目状态
                boolean checked = finalChildViewHolder.getChild_cb().isChecked();
                //赋值--改变bean
                child_list.get(childPosition).setChild_flag(checked);
                //for循环，
                boolean flag = true;
                for (int i = 0; i < child_list.size(); i++) {
                    boolean child_flag = child_list.get(i).isChild_flag();
                    if (child_flag == false) {
                        flag = false;
                    }
                }
                //然后将flag赋值给父条目的bean
                list.get(groupPosition).setParent_flag(flag);

                notifyDataSetChanged();

                //调用计算的方法
                PresenterImpl presenter = new PresenterImpl();
                presenter.showSumToView(new ModelImpl(), iMainView);
            }
        });

        //删除
        childViewHolder.getDelte().setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                child_list.remove(childPosition);
                notifyDataSetChanged();
            }
        });

        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return false;
    }

    //父布局的ViewHolder
    public class ParentViewHolder {
        private CheckBox parent_cb;
        private TextView parent_tv;

        public ParentViewHolder(CheckBox parent_cb, TextView parent_tv) {
            this.parent_cb = parent_cb;
            this.parent_tv = parent_tv;
        }

        public CheckBox getParent_cb() {
            return parent_cb;
        }

        public void setParent_cb(CheckBox parent_cb) {
            this.parent_cb = parent_cb;
        }

        public TextView getParent_tv() {
            return parent_tv;
        }

        public void setParent_tv(TextView parent_tv) {
            this.parent_tv = parent_tv;
        }
    }

    //子布局的ViewHolder
    public class ChildViewHolder {
        private CheckBox child_cb;
        private ImageView child_pic;
        private TextView child_title;
        private TextView delte;
        private TextView child_price;
        private AddSubView addSubView;

        public ChildViewHolder(CheckBox child_cb, ImageView child_pic, TextView child_title, TextView child_price, AddSubView addSubView, TextView delte) {
            this.child_cb = child_cb;
            this.child_pic = child_pic;
            this.child_title = child_title;
            this.child_price = child_price;
            this.addSubView = addSubView;
            this.delte = delte;
        }

        public AddSubView getAddSubView() {
            return addSubView;
        }

        public TextView getDelte() {
            return delte;
        }

        public void setDelte(TextView delte) {
            this.delte = delte;
        }

        public void setAddSubView(AddSubView addSubView) {
            this.addSubView = addSubView;
        }

        public CheckBox getChild_cb() {
            return child_cb;
        }

        public void setChild_cb(CheckBox child_cb) {
            this.child_cb = child_cb;
        }

        public ImageView getChild_pic() {
            return child_pic;
        }

        public void setChild_pic(ImageView child_pic) {
            this.child_pic = child_pic;
        }

        public TextView getChild_title() {
            return child_title;
        }

        public void setChild_title(TextView child_title) {
            this.child_title = child_title;
        }

        public TextView getChild_price() {
            return child_price;
        }

        public void setChild_price(TextView child_price) {
            this.child_price = child_price;
        }
    }
}

三个OK封装类

HttpConfig

public class HttpConfig {
    public static String gouwuche_url = "https://www.zhaoapi.cn/product/getCarts";
}

HttpUtils

public class HttpUtils {
    private static final String TAG = "HttpUtils-----";
    private static HttpUtils httpUtils;
    private final int SUCCESS = 0;
    private final int ERROR = 1;
    private MyHandler myHandler = new MyHandler();
    private OkLoadListener okLoadListener;

    public static HttpUtils getHttpUtils() {
        if (httpUtils == null) {
            httpUtils = new HttpUtils();
        }
        return httpUtils;
    }

    class MyHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case SUCCESS:
                    //成功
                    String json = (String) msg.obj;
                    okLoadListener.okLoadSuccess(json);
                    break;

                case ERROR:
                    //失败
                    String error = (String) msg.obj;
                    okLoadListener.okLoadError(error);
                    break;
            }
        }
    }

    //get
    public void okGet(String url) {
        OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(new MyIntercepter()).build();

        Request request = new Request.Builder().url(url).build();
        Call call = okHttpClient.newCall(request);

        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Message message = myHandler.obtainMessage();
                message.what = ERROR;
                message.obj = e.getMessage();
                myHandler.sendMessage(message);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Message message = myHandler.obtainMessage();
                message.what = SUCCESS;
                message.obj = response.body().string();
                myHandler.sendMessage(message);
            }
        });
    }

    public void setOkLoadListener(OkLoadListener okLoadListener) {
        this.okLoadListener = okLoadListener;
    }

    //post
    public void okPost(String url, Map<String, String> params) {
        OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(new MyIntercepter()).build();

        FormBody.Builder builder = new FormBody.Builder();
        Set<String> keySet = params.keySet();
        for (String key :
                keySet) {
            String value = params.get(key);
            builder.add(key, value);
        }
        FormBody formBody = builder.build();
        Request request = new Request.Builder().url(url).post(formBody).build();
        Call call = okHttpClient.newCall(request);

        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Message message = myHandler.obtainMessage();
                message.what = ERROR;
                message.obj = e.getMessage();
                myHandler.sendMessage(message);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Message message = myHandler.obtainMessage();
                message.what = SUCCESS;
                message.obj = response.body().string();
                myHandler.sendMessage(message);
            }
        });

    }

    //拦截器
    class MyIntercepter implements Interceptor {
        //intercept 拦截
        @Override
        public Response intercept(Chain chain) throws IOException {
            //添加公共参数
			//post 取出原来所有的参数，将之加到新的请求体里面。然后让请求去执行
            Request request = chain.request();
            //获取请求方法
            String method = request.method();
            if (method.equals("GET")) {//---------------------------GET 拦截
                //取出url地址
                String url = request.url().toString();
                //拼接公共参数
                boolean contains = url.contains("?");
                if (contains) {
                    url = url + "&source=android";
                } else {
                    url = url + "?source=android";
                }

                Request request1 = request.newBuilder().url(url).build();

                Response response = chain.proceed(request1);

                return response;


            } else if (method.equals("POST")) {//---------------------POST 拦截
                RequestBody body = request.body();//请求体
                if (body instanceof FormBody) {
                    //创建新的请求体
                    FormBody.Builder newBuilder = new FormBody.Builder();
                    for (int i = 0; i < ((FormBody) body).size(); i++) {
                        String key = ((FormBody) body).name(i);
                        String value = ((FormBody) body).value(i);
                        newBuilder.add(key, value);
                    }
                    //添加公共参数
                    newBuilder.add("source", "android");
                    FormBody newBody = newBuilder.build();
                    //创建新的请求体
                    Request request1 = request.newBuilder().post(newBody).build();
                    //去请求
                    Response response = chain.proceed(request1);
                    return response;
                }
            }
            return null;
        }
    }

    //上传文件（图片）
    public void upLoadImage(String url, String path) {//url 要上传的地址。path 要上传的文件路径
        //媒体类型
        MediaType mediaType = MediaType.parse("image/*");
        //multipartbody
        MultipartBody.Builder builder = new MultipartBody.Builder().setType(MultipartBody.FORM);
        File file = new File(path);
        MultipartBody multipartBody = builder.addFormDataPart("file", file.getName(), RequestBody.create(mediaType, file)).build();

        OkHttpClient okHttpClient = new OkHttpClient();
        Request request = new Request.Builder().url(url).post(multipartBody).build();
        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.d(TAG, "上传失败0----: ");
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.d(TAG, "上传成功: ");
            }
        });

    }
}

OkLoadListener

public interface OkLoadListener {
    void okLoadSuccess(String json);
    void okLoadError(String error);
}

MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener,IMainView {

    private ExpandableListView expandableListView;
    private CheckBox checkBox;
    private TextView tv_sum;
    private Button jisuan;
    private static final String TAG = "MainActivity0------";
    private List<GouWuBean.DataBean> list_tmp;
    private MyAdapter myAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //初始化控件
        initViews();
        //请求数据
        initDatas();
    }

    private void initDatas() {
        PresenterImpl presenter = new PresenterImpl();
        presenter.showGouWuCheToView(new ModelImpl(),this);
    }

    private void initViews() {
        expandableListView = findViewById(R.id.expandable_list_view);
        checkBox = findViewById(R.id.cb);
        tv_sum = findViewById(R.id.tv_sum);
        jisuan = findViewById(R.id.jisuan);

        checkBox.setOnClickListener(this);
        jisuan.setOnClickListener(this);
    }

    //点击事件
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //全选，全部选  总价
            case R.id.cb:
                boolean checked = checkBox.isChecked();
                for (int i = 0; i < list_tmp.size(); i++) {
                    list_tmp.get(i).setParent_flag(checked);
                    List<GouWuBean.ChildBean> list_child = list_tmp.get(i).getList();
                    for (int j = 0; j < list_child.size(); j++) {

                        list_child.get(j).setChild_flag(checked);
                    }
                }
                //刷新适配器
                myAdapter.notifyDataSetChanged();
                //调用计算总价的方法
                PresenterImpl presenter = new PresenterImpl();
                presenter.showSumToView(new ModelImpl(),this);
                break;

            case R.id.jisuan:
                Toast.makeText(MainActivity.this,"去计算总价",Toast.LENGTH_SHORT).show();
                break;
        }
    }
    //展示购物车数据
    @Override
    public void showGowWuList(List<GouWuBean.DataBean> list) {
        list_tmp=list;
        Log.d(TAG, "showGowWuList: "+list);

        myAdapter = new MyAdapter(MainActivity.this, list,this);
        expandableListView.setAdapter(myAdapter);
        //展开expandablelistview
        int childCount = expandableListView.getCount();
        for (int i = 0; i < childCount; i++) {
            expandableListView.expandGroup(i);
        }
    }
    //显示总价
    @Override
    public void showSum(double price) {
        tv_sum.setText("合计:"+price);
    }

    @Override
    public List<GouWuBean.DataBean> getList() {
        return list_tmp;
    }
}