购物车（简单版）

效果图

结构图

activity_main.xml

<?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=".MainActivity">

    <ExpandableListView
        android:id="@+id/list_car"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp">

        <CheckBox
            android:id="@+id/check_all"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:text="全选" />
        <!--
        android:layout_centerVertical="true"
            表示在此布局中(高)居中显示
            -->
        <TextView
            android:id="@+id/goods_sum_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="20dp"
            android:layout_toRightOf="@+id/check_all"
            android:text="价格：" />
    </RelativeLayout>
</LinearLayout>

MainActivity

package bawei.com.yuekaodemo3;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
import bawei.com.yuekaodemo3.adapter.CarAdapter;
import bawei.com.yuekaodemo3.bean.Result;
import bawei.com.yuekaodemo3.bean.Shop;
import bawei.com.yuekaodemo3.core.DataCall;
import bawei.com.yuekaodemo3.presenter.CartPresenter;

public class MainActivity extends AppCompatActivity implements CarAdapter.TotalPriceLister, DataCall<List<Shop>> {
    private TextView mSunPirce;
    private CheckBox mCheck_All;
    private CarAdapter carAdapter;
    private ExpandableListView mGoodsList;
    private CartPresenter cartPresenter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 找到控件
        mSunPirce = findViewById(R.id.goods_sum_price);
        mCheck_All = findViewById(R.id.check_all);
        mGoodsList = findViewById(R.id.list_car);
        // 没有箭头
        mGoodsList.setGroupIndicator(null);
        // 让group不能被点击
        mGoodsList.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                return true;
            }
        });
        //点击全选按钮
        mCheck_All.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                carAdapter.checkAll(isChecked);//全部选中
            }
        });
        // 得到适配器对象
        carAdapter = new CarAdapter();
        carAdapter.setTotalPriceLister(this);// 回调总金额
        // 设置适配器
        mGoodsList.setAdapter(carAdapter);
        cartPresenter = new CartPresenter(this);// 调用P层
        cartPresenter.requestData();// 使用MVP模式
    }
    @Override
    public void totalprice(double totalprice) {
        // 设置总金额
        mSunPirce.setText(String.valueOf(totalprice));
    }
    @Override
    public void success(List<Shop> data) {
        // 添加数据
        carAdapter.addAll(data);
        // 默认展开 所有数据
        int size = data.size();
        for (int i = 0; i < size; i++) {
            mGoodsList.expandGroup(i);// 展开
        }
        // 更新数据
        carAdapter.notifyDataSetChanged();
    }
    @Override
    public void fail(Result result) {
        cartPresenter.unBindCall();// 防治内存泄露
        Toast.makeText(this, "" + result.getMsg(), Toast.LENGTH_SHORT).show();
    }

}

bean层Result
返回结果

package bawei.com.yuekaodemo3.bean;

public class Result<T> {
    int code;
    String msg;
    T data;

    public int getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

}

Shop.java
商家

package bawei.com.yuekaodemo3.bean;

import java.util.List;

public class Shop {
    List<Goods> list;
    String sellerName;
    String sellerid;

    // 自己添加的 为了判断复选框是否选中
    boolean check;

    public void setCheck(boolean check) {
        this.check = check;
    }

    public boolean isCheck() {
        return check;
    }

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

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

    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;
    }

}

Goods.java
商品

package bawei.com.yuekaodemo3.bean;

public class Goods {
    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;




    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;
    }
}

adapter层CarAdapter
适配器

package bawei.com.yuekaodemo3.adapter;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.ArrayList;
import java.util.List;

import bawei.com.yuekaodemo3.R;
import bawei.com.yuekaodemo3.bean.Goods;
import bawei.com.yuekaodemo3.bean.Result;
import bawei.com.yuekaodemo3.bean.Shop;
import bawei.com.yuekaodemo3.core.AddSubLayout;

public class CarAdapter extends BaseExpandableListAdapter {
    private List<Shop> mList = new ArrayList<>();
    private TotalPriceLister priceLister;
    //实例化自定义接口
    public void setTotalPriceLister(TotalPriceLister totalPriceLister) {
        this.priceLister = totalPriceLister;
    }
    // 点击全选 则调用次方法
    public void checkAll(boolean is) {
        for (int i = 0; i < mList.size(); i++) {
            Shop shop = mList.get(i);
            shop.setCheck(is);// 设置
            for (int j = 0; j < shop.getList().size(); j++) {
                Goods goods = shop.getList().get(j);
                goods.setSelected(is?1:0);//设置选中状态
            }
        }
        notifyDataSetChanged();// 刷新数据
        calculatePrice();//计算总价
    }
    // 自定义接口
    public interface TotalPriceLister{
        void totalprice(double totalprice);

        void success(List<Shop> data);

        void fail(Result result);
    }
    public void addAll(List<Shop> list){
        if (list != null) {
            mList.addAll(list);// 添加数据
        }
    }
    @Override
    public int getGroupCount() {
        return mList.size();
    }
    @Override
    public int getChildrenCount(int groupPosition) {
        return mList.get(groupPosition).getList().size();
    }
    @Override
    public Object getGroup(int groupPosition) {
        return mList.get(groupPosition);
    }
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return mList.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 false;
    }
    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        GroupHolder groupHolder = null;
        if (convertView == null) {
            convertView = View.inflate(parent.getContext(), R.layout.child_item, null);
            groupHolder = new GroupHolder();
            groupHolder.checkBox = convertView.findViewById(R.id.g_checkbox);
            convertView.setTag(groupHolder);
        } else {
            groupHolder = (GroupHolder) convertView.getTag();
        }
        final Shop shop = mList.get(groupPosition);// 得到此商铺
        groupHolder.checkBox.setText(shop.getSellerName());// 设置商品的名字
        groupHolder.checkBox.setChecked(shop.isCheck());// 这是商铺的选中状态
        groupHolder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 防治点击事件与选中发生冲突
                CheckBox checkBox= (CheckBox) v;
                shop.setCheck(checkBox.isChecked());// 设置商品的选中状态
                List<Goods> goodsList = mList.get(groupPosition).getList();// 得到商品的信息
                for (int i = 0; i < goodsList.size(); i++) {
                    goodsList.get(i).setSelected(checkBox.isChecked() ? 1 : 0);// 设置是否选中
                }
                // 更新适配器
                notifyDataSetChanged();

                // 计算价格
                calculatePrice();
            }
        });
        return convertView;
    }
    /**
     * 计算总价格
     */
    private void calculatePrice() {
        double totalprice=0;
        for (int i = 0; i < mList.size(); i++) {
            Shop shop = mList.get(i);
            for (int j = 0; j < shop.getList().size(); j++) {
                Goods goods = shop.getList().get(j);
                if (goods.getSelected() == 1) {
                    // 是选中状态的话则计算进去
                    totalprice = totalprice +goods.getNum()*goods.getPrice();
                }
            }
        }
        // 判断
        if (priceLister != null) {
            priceLister.totalprice(totalprice);// 将值利用接口回调传回Activity进行展示
        }
    }
    class GroupHolder {
        CheckBox checkBox;// 这是二级列表的第一级
    }
    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildHolder childHolder=null;
        if (convertView == null) {
            childHolder = new ChildHolder();
            convertView = View.inflate(parent.getContext(),R.layout.add_stu,null);
            childHolder.addSub= convertView.findViewById(R.id.add_sub);
            childHolder.check = convertView.findViewById(R.id.child_check);
            childHolder.image = convertView.findViewById(R.id.image_cc);
            childHolder.price = convertView.findViewById(R.id.text_price);
            childHolder.text = convertView.findViewById(R.id.text_ttt);
            convertView.setTag(childHolder);
        }else{
            childHolder= (ChildHolder) convertView.getTag();
        }
        // 得到单个商品
        final Goods goods = mList.get(groupPosition).getList().get(childPosition);
        childHolder.text.setText(goods.getTitle());
        childHolder.price.setText(goods.getPrice()+"");// 单价
        // 点击选中，计算价格
        childHolder.check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 防治点击事件与选中发生冲突
                CheckBox checkBox = (CheckBox) v;
                goods.setSelected(checkBox.isChecked()?1:0);//设置此商品是否选中
                // 计算价格
                calculatePrice();
            }
        });
        // 设置商品的复选框
        if (goods.getSelected()==0) {
            childHolder.check.setChecked(false);
        }else{
            childHolder.check.setChecked(true);
        }
        //设置图片
        String images = goods.getImages();
        String[] split = images.split("\\|");
        if (split .length>0) {
            Glide.with(parent.getContext()).load(split[0].replace("https","http")).into(childHolder.image);
        }
        // 设置次商品的数量
        childHolder.addSub.setCount(goods.getNum());
        childHolder.addSub.setAddSubListener(new AddSubLayout.AddSubListener() {
            @Override
            public void addSub(int number) {
                goods.setNum(number);//设置数量
                calculatePrice();// 计算价格
            }
        });
        return convertView;
    }
    class ChildHolder {
        CheckBox check;
        TextView text;
        TextView price;
        ImageView image;
        AddSubLayout addSub;
    }
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return false;
    }

}

core层AddSubLayout

package bawei.com.yuekaodemo3.core;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import bawei.com.yuekaodemo3.R;

public class AddSubLayout extends LinearLayout implements View.OnClickListener{
    private TextView jian;
    private TextView jia;
    private TextView num;
    private AddSubListener addSubListener;
    // 实例化接口的变量
    public void setAddSubListener(AddSubListener addSubListener) {
        this.addSubListener = addSubListener;
    }

    public AddSubLayout(Context context) {
        super(context);
        initView();
    }

    public AddSubLayout(Context context,   AttributeSet attrs) {
        super(context, attrs);
        initView();
    }

    public AddSubLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView();
    }

    private void initView() {
//        第三个参数写成this
        View view = View.inflate(getContext(), R.layout.group_item,this);
        jian = view.findViewById(R.id.add_jian);
        jia = view.findViewById(R.id.add_jia);
        num = view.findViewById(R.id.num);
        jia.setOnClickListener(this);
        jian.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        // 得到数量的值
        int number = Integer.parseInt(num.getText().toString());

        switch (v.getId()){
            case R.id.add_jia:
                number++;
                num.setText(number+"");
                break;
            case R.id.add_jian:
                if (number == 0) {
                    Toast.makeText(getContext(), "数量不可小于0", Toast.LENGTH_SHORT).show();
                    return;
                }
                number--;
                num.setText(number+"");
                break;
        }
        if (addSubListener!=null) {
            addSubListener.addSub(number);
        }

    }
    public void setCount(int count) {
        num.setText(count+"");
    }
    // 自定义接口
    public interface AddSubListener{
        void addSub(int number);
    }

}

BasePresenter

package bawei.com.yuekaodemo3.core;

import android.os.Handler;
import android.os.Looper;
import android.os.Message;

import bawei.com.yuekaodemo3.bean.Result;

public abstract class BasePresenter {

    DataCall dataCall;
    public BasePresenter(DataCall dataCall){
        this.dataCall = dataCall;
    }
    Handler mHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {

            Result result = (Result) msg.obj;
            if (result.getCode()==0){
                dataCall.success(result.getData());
            }else{
                dataCall.fail(result);
            }
        }
    };
    public void requestData(final Object...args){
        new Thread(new Runnable() {
            @Override
            public void run() {
                Message message = mHandler.obtainMessage();
                message.obj = getData(args);
                mHandler.sendMessage(message);

            }
        }).start();
    }
    protected abstract Result getData(Object...args);
    public void unBindCall(){
        this.dataCall = null;//防治内存泄露
    }

}

DataCall

package bawei.com.yuekaodemo3.core;

import bawei.com.yuekaodemo3.bean.Result;

public interface DataCall<T> {
    // 成功
    void success(T data);
    // 失败
    void fail(Result result);
}

HttpUtils

package bawei.com.yuekaodemo3.core;

import java.io.IOException;
import java.util.concurrent.TimeUnit;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;

public class HttpUtils {
    public static String get(String urlString) {

        // 添加日志拦截器
        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .connectTimeout(20, TimeUnit.SECONDS)//连接超时
                .readTimeout(20, TimeUnit.SECONDS)//读取超时
                .callTimeout(20, TimeUnit.SECONDS)//呼叫超时
                .addInterceptor(loggingInterceptor)// 日志拦截器
                .build();

        Request request = new Request.Builder().url(urlString).get().build();

        try {
            Response response = okHttpClient.newCall(request).execute();
            return response.body().string();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }

    //okhttp使用单例模式
    private static OkHttpClient singleton;
    //非常有必要，要不此类还是可以被new，但是无法避免反射，好恶心
    private HttpUtils(){

    }
    public static OkHttpClient getInstance() {
        if (singleton == null)
        {
            synchronized (HttpUtils.class)
            {
                if (singleton == null)
                {
                    singleton = new OkHttpClient();
                }
            }
        }
        return singleton;
    }
}

model层的CartModel

package bawei.com.yuekaodemo3.model;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.util.List;

import bawei.com.yuekaodemo3.bean.Result;
import bawei.com.yuekaodemo3.bean.Shop;

public class CartModel {
    private static Result result;

    public static Result goodsList() {
        // 可以调用okhttp  因接口容易崩溃直接将数据取了出来
//        String resultString = HttpUtils.get("http://www.zhaoapi.cn/product/getCarts?uid=71");
        String resultString = "{\"msg\":\"请求成功\",\"code\":\"0\",\"data\":[{\"list\":[],\"sellerName\":\"\",\"sellerid\":\"0\"},{\"list\":[{\"bargainPrice\":111.99,\"createtime\":\"2017-10-14T21:48:08\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":11,\"pid\":11,\"price\":8989.0,\"pscid\":1,\"selected\":0,\"sellerid\":4,\"subhead\":\"每个中秋都不能简单，无论身在何处，你总需要一块饼让生活更圆满，京东月饼让爱更圆满京东自营，闪电配送，更多惊喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋节月饼 老北京月饼礼盒655g\"}],\"sellerName\":\"商家4\",\"sellerid\":\"4\"},{\"list\":[{\"bargainPrice\":111.99,\"createtime\":\"2017-10-03T23:43:53\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":1,\"pid\":13,\"price\":465.0,\"pscid\":1,\"selected\":0,\"sellerid\":6,\"subhead\":\"每个中秋都不能简单，无论身在何处，你总需要一块饼让生活更圆满，京东月饼让爱更圆满京东自营，闪电配送，更多惊喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋节月饼 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老北京月饼礼盒655g\"}],\"sellerName\":\"商家12\",\"sellerid\":\"12\"},{\"list\":[{\"bargainPrice\":111.99,\"createtime\":\"2017-10-14T21:39:05\",\"detailUrl\":\"https:\\/\\/item.m.jd.com\\/product\\/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends\",\"images\":\"https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t9004\\/210\\/1160833155\\/647627\\/ad6be059\\/59b4f4e1N9a2b1532.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7504\\/338\\/63721388\\/491286\\/f5957f53\\/598e95f1N7f2adb87.jpg!q70.jpg|https:\\/\\/m.360buyimg.com\\/n0\\/jfs\\/t7441\\/10\\/64242474\\/419246\\/adb30a7d\\/598e95fbNd989ba0a.jpg!q70.jpg\",\"num\":3,\"pid\":1,\"price\":118.0,\"pscid\":1,\"selected\":0,\"sellerid\":17,\"subhead\":\"每个中秋都不能简单，无论身在何处，你总需要一块饼让生活更圆满，京东月饼让爱更圆满京东自营，闪电配送，更多惊喜，快用手指戳一下\",\"title\":\"北京稻香村 稻香村中秋节月饼 老北京月饼礼盒655g\"}],\"sellerName\":\"商家17\",\"sellerid\":\"17\"}]}";

        try {
            Gson gson = new Gson();

            Type type = new TypeToken<Result<List<Shop>>>() {
            }.getType();

            result = gson.fromJson(resultString, type);
            return result;
        } catch (Exception e) {
        }
        return result;
    }

}

presenter层的CartPresenter

package bawei.com.yuekaodemo3.presenter;

import bawei.com.yuekaodemo3.bean.Result;
import bawei.com.yuekaodemo3.core.BasePresenter;
import bawei.com.yuekaodemo3.core.DataCall;
import bawei.com.yuekaodemo3.model.CartModel;

public class CartPresenter extends BasePresenter {
    public CartPresenter(DataCall dataCall) {
        super(dataCall);
    }
    @Override
    protected Result getData(Object... args) {
        Result result = CartModel.goodsList();//调用网络请求获取数据
        return result;
    }

}

drawable

<?xml version="1.0" encoding="utf-8"?>
<shape  xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="5dp"></corners>
    <stroke
        android:width="2dp"
        android:color="@android:color/holo_red_dark">
    </stroke>


</shape >

add_stu.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ddd"
    android:orientation="horizontal"
    android:padding="10dp">

    <CheckBox
        android:id="@+id/child_check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp" />

    <ImageView
        android:id="@+id/image_cc"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/child_check"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/text_ttt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="-3dp"
        android:layout_toRightOf="@+id/image_cc"
        android:padding="10dp"
        android:text="aa" />

    <TextView
        android:id="@+id/text_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/text_ttt"

        android:layout_marginTop="10dp"
        android:layout_toRightOf="@+id/image_cc"
        android:padding="3dp"
        android:text="价格" />

    <bawei.com.yuekaodemo3.core.AddSubLayout
    android:id="@+id/add_sub"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignParentBottom="true"
    android:layout_marginBottom="20dp"
    android:layout_marginRight="20dp">
</bawei.com.yuekaodemo3.core.AddSubLayout>


</RelativeLayout>

child_item.xml

<?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="match_parent"
    android:orientation="vertical">
    <CheckBox
        android:id="@+id/g_checkbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CheckBox"
        android:focusable="false"/>


</LinearLayout>

group_item.xml

<?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="match_parent"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/add_jia"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@drawable/car_bth_bg"
        android:focusable="false"
        android:gravity="center"

        android:text="+"
        android:textSize="22sp" />

    <TextView
        android:id="@+id/num"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:focusable="false"
        android:gravity="center"
        android:text="1000"
        android:textSize="22sp" />

    <TextView
        android:id="@+id/add_jian"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@drawable/car_bth_bg"
        android:focusable="false"
        android:gravity="center"
        android:text="-"
        android:textSize="22sp" />

</LinearLayout>

依赖

    implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.squareup.okhttp3:okhttp:3.12.0'
    implementation 'com.github.bumptech.glide:glide:4.8.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:3.12.0'

权限

 <uses-permission android:name="android.permission.INTERNET" />