Retrofit+Rxjava+MVP网络请求购物车

效果图：

首先先导依赖

 //retrofit依赖
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    //retrofit内部封装的GSON
    compile 'io.reactivex.rxjava2:rxjava:2.1.7'
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    compile 'com.facebook.fresco:fresco:0.12.0'
    compile 'com.facebook.fresco:animated-base-support:0.12.0'
    compile 'com.facebook.fresco:animated-webp:0.12.0'
    compile 'com.facebook.fresco:webpsupport:0.12.0'
    compile 'com.jakewharton:butterknife:6.1.0'
    compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'

网络权限

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

在values文件里创建一个attrs

<resources>

    <declare-styleable name="AddDeleteView">
        <attr name="left_item" format="string">attr>
        <attr name="right_item" format="string">attr>
        <attr name="middle_item" format="string">attr>
    declare-styleable>

resources>

住布局activity_main.xml

<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"
    tools:context="com.example.retrofitdemo5.MainActivity"
    android:orientation="vertical">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:text="购物车" />

        <TextView
            android:id="@+id/tv_bianji"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="编辑" />

    RelativeLayout>

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:orientation="horizontal"
        android:padding="10dp">

        <CheckBox
            android:id="@+id/check_all"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            android:text="全选"
            android:textSize="15dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:gravity="center_vertical"
            android:text="总价:"
            android:textSize="15dp" />

        <TextView
            android:id="@+id/tv_zjprice"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:gravity="center_vertical"
            android:text="0"
            android:textSize="15dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:gravity="center_vertical"
            android:text="数量:"
            android:textSize="15dp" />

        <TextView
            android:id="@+id/tv_count"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_weight="1"
            android:gravity="center_vertical"
            android:text="0"
            android:textSize="15dp" />

        <Button
            android:id="@+id/btn_js"
            android:layout_width="80dp"
            android:layout_height="40dp"
            android:layout_gravity="right"
            android:background="#fc0109"
            android:text="结算"
            android:textSize="15dp" />
    LinearLayout>

LinearLayout>

加减器布局jiajianqi.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv_delete"
        android:layout_width="31dp"
        android:layout_height="31dp"
        android:background="#999999"
        android:gravity="center"
        android:text="-" />

    <EditText
        android:id="@+id/ed_num"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@null"
        android:gravity="center" />

    <TextView
        android:id="@+id/tv_add"
        android:layout_width="31dp"
        android:layout_height="31dp"
        android:background="#999999"
        android:gravity="center"
        android:text="+" />

LinearLayout>

布局gowuc_goods_item.xml

注意事件 《com.example.retrofitdemo5.AddDeleteView 把你自己创建的AddDeleteView 类的com.example.retrofitdemo5复制过去

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:weightSum="1">

    <CheckBox
        android:id="@+id/check_gwc_goods"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_centerVertical="true"
        android:gravity="center_vertical" />

    <ImageView
        android:id="@+id/img_gwc_goods"
        android:layout_width="107dp"
        android:layout_height="80dp"
        android:src="@mipmap/ic_launcher" />

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

        <TextView
            android:id="@+id/tv_gwc_goods"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="title" />

        <LinearLayout
            android:layout_width="298dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/tv_gwc_price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="价格:"
                android:textColor="#fa0000" />
        LinearLayout>

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <com.example.retrofitdemo5.AddDeleteView
                android:id="@+id/add_delete"
                android:layout_width="100dp"
                android:layout_height="30dp"
                android:layout_centerVertical="true"
                android:layout_marginRight="5dp"
                app:left_item="-"
                app:middle_item="1"
                app:right_item="+">

            com.example.retrofitdemo5.AddDeleteView>

            <Button
                android:id="@+id/btn_gwc_delete"
                android:layout_width="110dp"
                android:layout_height="40dp"
                android:layout_alignParentRight="true"
                android:background="#f70496"
                android:gravity="center"
                android:text="删除"
                android:textColor="#ffffff" />

        RelativeLayout>
    LinearLayout>

LinearLayout>

布局gowuc_group_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <CheckBox
        android:id="@+id/check_gwc_group"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_centerVertical="true"
        android:layout_marginLeft="20dp" />

    <TextView
        android:id="@+id/tv_gwc_group"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="title"
        android:textSize="20dp" />


LinearLayout>

创建Bean包

CarBean 类

    /**
     * msg : 请求成功
     * code : 0
     * data : [{"list":[{"bargainPrice":11800,"createtime":"2017-10-10T17:33:37","detailUrl":"https://item.m.jd.com/product/4338107.html?utm#_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\r\n"},{"bargainPrice":99,"createtime":"2017-10-14T21:38:26","detailUrl":"https://item.m.jd.com/product/4345173.html?utm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t6037/35/2944615848/95178/6cd6cff0/594a3a10Na4ec7f39.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t6607/258/1025744923/75738/da120a2d/594a3a12Ne3e6bc56.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t6370/292/1057025420/64655/f87644e3/594a3a12N5b900606.jpg!q70.jpg","num":6,"pid":45,"price":2999,"pscid":39,"selected":0,"sellerid":1,"subhead":"高清双摄，就是清晰！2000+1600万高清摄像头，6GB大内存+高通骁龙835处理器，性能怪兽！","title":"一加手机5 (A5000) 6GB+64GB 月岩灰 全网通 双卡双待 移动联通电信4G手机"}],"sellerName":"商家1","sellerid":"1"},{"list":[{"bargainPrice":11800,"createtime":"2017-10-14T21:38:26","detailUrl":"https://item.m.jd.com/product/5025518.html?utm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t8830/106/1760940277/195595/5cf9412f/59bf2ef5N5ab7dc16.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5428/70/1520969931/274676/b644dd0d/591128e7Nd2f70da0.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5566/365/1519564203/36911/620c750c/591128eaN54ac3363.jpg!q70.jpg","num":1,"pid":58,"price":6399,"pscid":40,"selected":0,"sellerid":2,"subhead":"升级4G大显存！Nvme协议Pcie SSD,速度快人一步】GTX1050Ti就选拯救者！专业游戏键盘&新模具全新设计！","title":"联想(Lenovo)拯救者R720 15.6英寸游戏笔记本电脑(i5-7300HQ 8G 1T+128G SSD GTX1050Ti 4G IPS 黑)"}],"sellerName":"商家2","sellerid":"2"},{"list":[{"bargainPrice":22.9,"createtime":"2017-10-03T23:53:28","detailUrl":"https://item.m.jd.com/product/2542855.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t1930/284/2865629620/390243/e3ade9c4/56f0a08fNbd3a1235.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t2137/336/2802996626/155915/e5e90d7a/56f0a09cN33e01bd0.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t1882/31/2772215910/389956/c8dbf370/56f0a0a2Na0c86ea6.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t2620/166/2703833710/312660/531aa913/57709035N33857877.jpg!q70.jpg","num":1,"pid":26,"price":88,"pscid":2,"selected":0,"sellerid":3,"subhead":"三只松鼠零食特惠，专区满99减50，满199减100，火速抢购》","title":"三只松鼠 坚果炒货 零食奶油味 碧根果225g/袋"}],"sellerName":"商家3","sellerid":"3"},{"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":11,"pid":1,"price":118,"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"},{"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":7,"pid":2,"price":299,"pscid":1,"selected":0,"sellerid":18,"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18","sellerid":"18"}]
     */

    private String msg;
    private String code;
    private List 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 getData() {
        return data;
    }

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

    public static class DataBean {
        /**
         * list : [{"bargainPrice":11800,"createtime":"2017-10-10T17:33:37","detailUrl":"https://item.m.jd.com/product/4338107.html?utm#_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\r\n"},{"bargainPrice":99,"createtime":"2017-10-14T21:38:26","detailUrl":"https://item.m.jd.com/product/4345173.html?utm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t6037/35/2944615848/95178/6cd6cff0/594a3a10Na4ec7f39.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t6607/258/1025744923/75738/da120a2d/594a3a12Ne3e6bc56.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t6370/292/1057025420/64655/f87644e3/594a3a12N5b900606.jpg!q70.jpg","num":6,"pid":45,"price":2999,"pscid":39,"selected":0,"sellerid":1,"subhead":"高清双摄，就是清晰！2000+1600万高清摄像头，6GB大内存+高通骁龙835处理器，性能怪兽！","title":"一加手机5 (A5000) 6GB+64GB 月岩灰 全网通 双卡双待 移动联通电信4G手机"}]
         * sellerName : 商家1
         * sellerid : 1
         */

        private String sellerName;
        private String sellerid;
        private 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;
        }

        public List getList() {
            return list;
        }

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

        public static class ListBean {
            /**
             * bargainPrice : 11800.0
             * createtime : 2017-10-10T17:33:37
             * detailUrl : https://item.m.jd.com/product/4338107.html?utm#_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 : 5199.0
             * 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;

            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;
            }
        }
    }

GoodsBean类

 private boolean goodscheck;
    private double bargainPrice;
    private String images;
    private String title;
    private String subhead;
    private int num;
    private boolean btn;
    private int pid;

    public GoodsBean(boolean goodscheck, double bargainPrice, String images, String title, String subhead, int num, boolean btn) {
        this.goodscheck = goodscheck;
        this.bargainPrice = bargainPrice;
        this.images = images;
        this.title = title;
        this.subhead = subhead;
        this.num = num;
        this.btn = btn;
    }

    public GoodsBean(boolean goodscheck, double bargainPrice, String images, String title, String subhead, int num, int pid) {
        this.goodscheck = goodscheck;
        this.bargainPrice = bargainPrice;
        this.images = images;
        this.title = title;
        this.subhead = subhead;
        this.num = num;
        this.pid = pid;
    }

    public int getPid() {
        return pid;
    }

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

    public boolean isBtn() {
        return btn;
    }

    public void setBtn(boolean btn) {
        this.btn = btn;
    }

    public int getNum() {
        return num;
    }

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

    public boolean isGoodscheck() {
        return goodscheck;
    }

    public void setGoodscheck(boolean goodscheck) {
        this.goodscheck = goodscheck;
    }

    public double getBargainPrice() {
        return bargainPrice;
    }

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

    public String getImages() {
        return images;
    }

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

    public String getTitle() {
        return title;
    }

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

    public String getSubhead() {
        return subhead;
    }

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

    @Override
    public String toString() {
        return "GoodsBean{" +
                "goodscheck=" + goodscheck +
                ", bargainPrice=" + bargainPrice +
                ", images='" + images + '\'' +
                ", title='" + title + '\'' +
                ", subhead='" + subhead + '\'' +
                ", num=" + num +
                ", btn=" + btn +
                '}';
    }

GroupBean类

private boolean groupcheck;
    private String sellerName;
    private String sellerid;

    public GroupBean(boolean groupcheck, String sellerName, String sellerid) {
        this.groupcheck = groupcheck;
        this.sellerName = sellerName;
        this.sellerid = sellerid;
    }

    public boolean isGroupcheck() {
        return groupcheck;
    }

    public void setGroupcheck(boolean groupcheck) {
        this.groupcheck = groupcheck;
    }

    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;
    }

    @Override
    public String toString() {
        return "GroupBean{" +
                "groupcheck=" + groupcheck +
                ", sellerName='" + sellerName + '\'' +
                ", sellerid=" + sellerid +
                '}';
    }

view包里

CarView类

public interface CarView extends IView{

    void CarSuccess(CarBean carBean);
    void CarFaild(Throwable throwable);
}

IView类

public interface IView {

}

utils包

RetrofitManager类

public class RetrofitManager  {


    private static final String Url="http://120.27.23.105/";

    private static Retrofit mRetrofit;
    private static class Car_Holder{
        private static final RetrofitManager instance=new RetrofitManager(Url);
    }

    public static RetrofitManager getinstance() {
        return Car_Holder.instance;
    }

    public RetrofitManager(String url) {
        mRetrofit= buildRetrofit();
    }

    //OkHttpClient
    private OkHttpClient buildOkHttpClient(){
        return new OkHttpClient.Builder()
                .connectTimeout(10000, TimeUnit.MILLISECONDS)
                .build();
    }

    //Retrofit
    private Retrofit buildRetrofit(){
        return new Retrofit.Builder()
                .client(buildOkHttpClient())
                .baseUrl(Url)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();
    }

    public  T create(Class tClass){
        return mRetrofit.create(tClass);
    }
}

AddDeleteView类

public class AddDeleteView extends LinearLayout {
    private OnAddDelClickListener listener;
    private EditText etNumber;
    //对外提供一个点击的回调接口
    public interface OnAddDelClickListener {
        void onAddClick(View v);

        void onDelClick(View v);
    }

    public void setOnAddDelClickListener(OnAddDelClickListener listener) {
        if (listener != null) {
            this.listener = listener;
        }
    }
    public AddDeleteView(Context context) {
        this(context, null);
    }

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

    public AddDeleteView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context, attrs, defStyleAttr);
    }

    private void initView(Context context, AttributeSet attrs, int defStyleAttr) {
        View.inflate(context, R.layout.adddelete, this);
        TextView txtDelete = (TextView) findViewById(R.id.tv_delete);
        TextView txtAdd = (TextView) findViewById(R.id.tv_add);
        etNumber = (EditText) findViewById(R.id.ed_num);

        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.AddDeleteView);

        String leftText = typedArray.getString(R.styleable.AddDeleteView_left_item);
        String rightText = typedArray.getString(R.styleable.AddDeleteView_right_item);
        String middleText = typedArray.getString(R.styleable.AddDeleteView_middle_item);

        txtDelete.setText(leftText);
        txtAdd.setText(rightText);
        etNumber.setText(middleText);

        //回收
        typedArray.recycle();
        txtDelete.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.onDelClick(view);
            }
        });

        txtAdd.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.onAddClick(view);
            }
        });
    }
    //对外提供一个修改数字的方法
    public void setNumber(int number) {
        if (number > 0) {
            etNumber.setText(number + "");
        }
    }
    //对外提供一个获取当前数字的方法
    public int getNumber() {
        String string = etNumber.getText().toString();
        int i = Integer.parseInt(string);
        return i;
    }
}

CarApi类

public interface CarApi {

    @GET("product/getCarts")
    Observable selectcar(@Query("uid") String uid);
}

MyApp类

public class MyApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Fresco.initialize(this);
    }
}

model包

CarModel类

public class CarModel implements IModel {

    //查询购物车
    public Observable selectcar(){
        CarApi carApi = RetrofitManager.getinstance().create(CarApi.class);
        return carApi.selectcar("1600");
    }
}

IModel类

public interface IModel {


}

adapter包

CarAdapter类

public class CarAdapter extends BaseExpandableListAdapter {

    Context context;
    List grouplist;
    ArrayList> goodslist;
    MainActivity carActivity;

    public CarAdapter(Context context, List grouplist, ArrayList> goodslist, MainActivity carActivity) {
        this.context = context;
        this.grouplist = grouplist;
        this.goodslist = goodslist;
        this.carActivity = carActivity;
    }

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

    @Override
    public int getChildrenCount(int i) {
        return goodslist.get(i).size();
    }

    @Override
    public Object getGroup(int i) {
        return grouplist.get(i);
    }

    @Override
    public Object getChild(int i, int i1) {
        return goodslist.get(i).get(i1);
    }

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

    @Override
    public long getChildId(int i, int i1) {
        return i1;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }
    //父布局

    @Override
    public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {
        View group_view = View.inflate(context, R.layout.gwc_group_item, null);
        final CheckBox check_group = group_view.findViewById(R.id.check_gwc_group);
        TextView group = group_view.findViewById(R.id.tv_gwc_group);
        check_group.setChecked(grouplist.get(i).isGroupcheck());
        group.setText(grouplist.get(i).getSellerName());
        check_group.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                GroupBean groupBean = grouplist.get(i);
                groupBean.setGroupcheck(check_group.isChecked());
                for (int j = 0; j get(j).isGroupcheck();
                    if (!groupcheck){
                        carActivity.checkAll.setChecked(false);
                        break;
                    }else {
                        carActivity.checkAll.setChecked(true);
                    }
                }
                ArrayList goodsBeen = goodslist.get(i);
                for (int i = 0; i get(i).setGoodscheck(check_group.isChecked());
                }
                //计算价格
                carActivity.changesum(goodslist);
                notifyDataSetChanged();
            }
        });
        return group_view;
    }

    //子布局

    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        View view = View.inflate(context, R.layout.gwc_goods_item, null);
        TextView tv_goods = (TextView) view.findViewById(R.id.tv_gwc_goods);
        TextView price = (TextView) view.findViewById(R.id.tv_gwc_price);
        final CheckBox check_goods = (CheckBox) view.findViewById(R.id.check_gwc_goods);
        ImageView img_goods = (ImageView) view.findViewById(R.id.img_gwc_goods);
        Button btn_delete = (Button) view.findViewById(R.id.btn_gwc_delete);
        final AddDeleteView adv = (AddDeleteView) view.findViewById(R.id.add_delete);
        tv_goods.setText(goodslist.get(groupPosition).get(childPosition).getTitle());
        price.setText(goodslist.get(groupPosition).get(childPosition).getBargainPrice() + "");
        check_goods.setChecked(goodslist.get(groupPosition).get(childPosition).isGoodscheck());
        String images = goodslist.get(groupPosition).get(childPosition).getImages();
        String[] split = images.split("\\|");
        Glide.with(img_goods.getContext()).load(split[0]).into(img_goods);
        adv.setNumber(goodslist.get(groupPosition).get(childPosition).getNum());
        adv.setNumber(goodslist.get(groupPosition).get(childPosition).getNum());
        if (goodslist.get(groupPosition).get(childPosition).isBtn()) {
            btn_delete.setVisibility(View.VISIBLE);
        } else {
            btn_delete.setVisibility(View.INVISIBLE);
        }
        adv.setOnAddDelClickListener(new AddDeleteView.OnAddDelClickListener() {
            @Override
            public void onAddClick(View v) {
                int number = adv.getNumber();
                number++;
                adv.setNumber(number);
                goodslist.get(groupPosition).get(childPosition).setNum(number);
                carActivity.changesum(goodslist);
            }

            @Override
            public void onDelClick(View v) {
                int number = adv.getNumber();
                if (number > 1) {
                    number--;
                }
                adv.setNumber(number);
                goodslist.get(groupPosition).get(childPosition).setNum(number);
                carActivity.changesum(goodslist);
            }
        });
        btn_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                carActivity.deleteShop(goodslist.get(groupPosition).get(childPosition).getPid());
                int size = goodslist.get(groupPosition).size();
                if (goodslist.get(groupPosition).get(childPosition).isGoodscheck()) {
                    if (size == 1) {
                        goodslist.remove(groupPosition);
                        grouplist.remove(groupPosition);
                    } else {
                        goodslist.get(groupPosition).remove(childPosition);
                    }
                    carActivity.changesum(goodslist);
                    notifyDataSetChanged();
                } else {
                    Toast.makeText(context, "请选择商品。。。", Toast.LENGTH_SHORT).show();
                }
            }
        });
        check_goods.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //定义一个默认flag
                boolean flag = false;
                //获得当前二级列表复选框的状态
                boolean cchecked = check_goods.isChecked();
                //把当前状态存储到二级列表List集合里面
                goodslist.get(groupPosition).get(childPosition).setGoodscheck(cchecked);

                //循环遍历二级列表List集合
                for (List i1 : goodslist) {
                    // 按照所有二级列表的item的个数进行循环遍历
                    for (int r = 0; r < i1.size(); r++) {
                        //获取当前二级列表的状态
                        boolean childCb1 = i1.get(r).isGoodscheck();
                        //取反设置 如果为true改为false 如果为false改为true
                        if (!childCb1) {
                            //如果当前二级列表中有一条复选框是false  全选为false
                            carActivity.checkAll.setChecked(false);
                            //如果当前二级列表中有一条复选框是false  一级列表为false
                            grouplist.get(groupPosition).setGroupcheck(false);
                            //flag为true跳出循环
                            flag = true;
                            break;
                        } else {
                            //如果所有的二级列表都为true  全选为true
                            carActivity.checkAll.setChecked(true);
                            //如果所有的二级列表都为true  一级列表为true
                            grouplist.get(groupPosition).setGroupcheck(true);
                        }
                    }
                    //falg为true时跳出循环
                    if (flag) {
                        break;
                    }
                }
                //当前二级列表的总长度
                int size = goodslist.get(groupPosition).size();
                //按照当前二级列表的总长度循环
                for (int x = 0; x < size; x++) {
                    //获得当前二级列表中每一个item的选中状态
                    boolean childCb1 = goodslist.get(groupPosition).get(x).isGoodscheck();
                    //判断
                    if (!childCb1) {
                        //有一个flase 一级列表就设置false  跳出循环
                        grouplist.get(groupPosition).setGroupcheck(false);
                        break;
                    } else {
                        grouplist.get(groupPosition).setGroupcheck(true);
                    }
                }
                //计算价格
                carActivity.changesum(goodslist);
                //刷新适配器
                notifyDataSetChanged();
            }
        });
        return view;
    }


    @Override
    public boolean isChildSelectable(int i, int i1) {
        return true;
    }
}

presenter包

CarPresenter类

public class CarPresenter extends IPresenter{
    private CarModel carModel;

    public CarPresenter(CarView view) {
        super(view);
    }
    @Override
    protected void inti() {
        carModel=new CarModel();
    }

    //查询购物车

    public  void selectcar(){
        Observable selectcar = carModel.selectcar();

        selectcar
                //在io子线程联网
                .subscribeOn(Schedulers.io())
                //在主线程更新UI
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer() {
                               @Override
                               public void accept(CarBean carBean) throws Exception {
                                   view.CarSuccess(carBean);
                               }
                           }
                        , new Consumer() {
                            @Override
                            public void accept(Throwable throwable) throws Exception {
                                view.CarFaild(throwable);
                            }
                        }
                );
    }
}

IPresenter类

public abstract class IPresenter<T extends IView> {


    protected T view;

    public IPresenter(T view) {
        this.view = view;
        inti();
    }

    protected abstract void inti();
}

MainActivity主页面

public class MainActivity extends AppCompatActivity implements CarView{


    @InjectView(R.id.tv_bianji)
    TextView tvBianji;
    @InjectView(R.id.exlist)
    ExpandableListView exlist;
    @InjectView(R.id.check_all)
    public CheckBox checkAll;
    @InjectView(R.id.tv_zjprice)
    TextView price;
    TextView tvZjprice;
    @InjectView(R.id.tv_count)
    TextView counts;
    TextView tvCount;
    @InjectView(R.id.btn_js)
    Button btnJs;
    private CarPresenter carPresenter;

    private boolean flagedit = true;

    ArrayList groupBeen = new ArrayList<>();
    ArrayList> goods = new ArrayList<>();
    private CarAdapter carAdapter;

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

        carPresenter = new CarPresenter(this);
        carPresenter.selectcar();
        carAdapter = new CarAdapter(this, groupBeen, goods, this);
        exlist.setAdapter(carAdapter);
        for (int i = 0; i < carAdapter.getGroupCount(); i++) {
            exlist.expandGroup(i);
        }
        carAdapter.notifyDataSetChanged();
    }
    @OnClick({R.id.tv_bianji, R.id.check_all, R.id.btn_js})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.tv_bianji:
                String trim = tvBianji.getText().toString().trim();
                if (trim.equals("编辑")) {
                    tvBianji.setText("完成");
                } else {
                    tvBianji.setText("编辑");
                }
                for (List i1 : goods) {
                    for (int r = 0; r < i1.size(); r++) {
                        i1.get(r).setBtn(flagedit);
                    }
                }
                flagedit = !flagedit;
                carAdapter.notifyDataSetChanged();
                break;
            case R.id.check_all:
                boolean checked = checkAll.isChecked();
                for (int i = 0; i < groupBeen.size(); i++) {
                    groupBeen.get(i).setGroupcheck(checked);
                }
                for (int q = 0; q < goods.size(); q++) {
                    ArrayList goodsBeen = goods.get(q);
                    for (int j = 0; j < goodsBeen.size(); j++) {
                        goodsBeen.get(j).setGoodscheck(checked);
                    }
                }
                changesum(goods);
                carAdapter.notifyDataSetChanged();
                break;
            case R.id.btn_js:
                int index = 0;
                for (int q = 0; q < goods.size(); q++) {
                    ArrayList goodsBeen = goods.get(q);
                    for (int j = 0; j < goodsBeen.size(); j++) {
                        boolean goodscheck = goodsBeen.get(j).isGoodscheck();
                        if (goodscheck) {
                            index++;
                        }
                    }
                }
                if (index == 0) {
                    Toast.makeText(this, "请选择商品，谢谢", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "钱就是另一回事了", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }

    @Override
    public void CarSuccess(CarBean carBean) {
        List data = carBean.getData();
        for (int i = 0; i < data.size(); i++) {
            groupBeen.add(new GroupBean(false, data.get(i).getSellerName(), data.get(i).getSellerid()));
            List list = data.get(i).getList();
            ArrayList goodsBeen = new ArrayList<>();
            for (int j = 0; j < list.size(); j++) {
                goodsBeen.add(new GoodsBean(false, list.get(j).getBargainPrice(), list.get(j).getImages(), list.get(j).getTitle(), list.get(j).getSubhead(), list.get(j).getNum(), list.get(j).getPid()));
            }
            goods.add(goodsBeen);
        }
        for (int i = 0; i < carAdapter.getGroupCount(); i++) {
            exlist.expandGroup(i);
        }
        carAdapter.notifyDataSetChanged();
    }

    @Override
    public void CarFaild(Throwable throwable) {

    }
    DecimalFormat df = new DecimalFormat("######0.00");

    public void changesum(ArrayList> childBeen) {
        int count = 0;
        double sum = 0;
        for (List i1 : childBeen) {
            for (int r = 0; r < i1.size(); r++) {
                boolean childCb1 = i1.get(r).isGoodscheck();
                if (childCb1) {
                    double price = i1.get(r).getBargainPrice();
                    int num = i1.get(r).getNum();
                    sum += price * num;
                    count++;
                }
            }
        }
        price.setText("￥" + df.format(sum));
        counts.setText(count + "");
    }

    public void deleteShop(int pid) {
        Toast.makeText(this, "aadas", Toast.LENGTH_SHORT).show();
    }

}

希望进来看的能够给你们帮助，你要是有更好的方法，可以发信息给我。互相可以探讨一下。我这代码只是给你们参考。