购物车一个Adaper，可以删除，全选反选，数量加减

1activity_main.xml页面布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".activity.MainActivity">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycle_view"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@id/text_jiesuan"
        />
        <CheckBox
            android:id="@+id/query"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@id/recycle_view"
            app:layout_constraintBottom_toBottomOf="parent"
            />
    <TextView
        android:id="@+id/text_query"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toRightOf="@id/query"
        app:layout_constraintBottom_toBottomOf="@id/query"
        app:layout_constraintTop_toTopOf="@id/query"
        android:textSize="20sp"
        android:text="全选/反选"
        />
    <TextView
        android:id="@+id/text_total"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/recycle_view"
        app:layout_constraintLeft_toRightOf="@id/text_query"
        android:layout_marginLeft="10dp"
        android:text="总价:￥0元"
        android:textColor="#f00"
        android:textSize="18sp"
        />
    <TextView
        android:id="@+id/text_shopp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/text_total"
        app:layout_constraintLeft_toRightOf="@id/text_query"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginLeft="10dp"
        android:text="共0件商品"
        android:textSize="18sp"
        />
    <TextView
        android:id="@+id/text_jiesuan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/recycle_view"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:text="去结算"
        android:textSize="26sp"
        android:background="@drawable/button_shape"
        android:gravity="center"
        />
</android.support.constraint.ConstraintLayout>

2自定义加减器布局

<?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"
    >
    <ImageButton
        android:id="@+id/jian"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@drawable/ic_jian_name"
        />
    <EditText
        android:id="@+id/ed_num"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:text="1"
        android:textSize="24sp"
        android:inputType="number"
        android:background="@drawable/edit_shape"
        />
    <ImageButton
        android:id="@+id/add"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@drawable/ic_add_name"
        />
</LinearLayout>

3.子条目布局

<?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:orientation="vertical"
    android:padding="15dp"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <CheckBox
            android:id="@+id/shop_check"
            android:layout_width="50dp"
            android:layout_height="50dp" />
        <TextView
            android:id="@+id/shopp_commodity"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:text="shopp_commodity"
            android:textSize="24sp"
            />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center_vertical"
        >
        <CheckBox
            android:id="@+id/item_check"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <ImageView
            android:id="@+id/item_image"
            android:layout_width="120dp"
            android:layout_height="120dp"
            android:src="@mipmap/ic_launcher"
            />
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginLeft="10dp"
            android:orientation="vertical"
            android:layout_weight="1"
            >
            <TextView
                android:id="@+id/item_name"
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:textSize="18sp"
                android:text="name"
                android:maxLines="2"
                />
            <TextView
                android:id="@+id/item_price"
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:textSize="18sp"
                android:text="price"
                android:textColor="#f00"
                />
            <com.example.shoppingcart01.custom.CustomView
                android:id="@+id/custom"
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="1"
                />
        </LinearLayout>
        <ImageView
            android:id="@+id/item_del"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_marginRight="10dp"
            android:src="@drawable/ic_del_name"
            />
    </LinearLayout>
</LinearLayout>

4.两个shape页面
4.1加减器shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="10dp"/>
    <solid android:color="#fff"/>
    <size android:height="45dp" android:width="45dp"/>
</shape>

4.2button的shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="200dp"/>
    <solid android:color="#0ff"/>
    <size android:width="130dp" android:height="60dp"/>
</shape>

5.Bean类 里面需要自己写三个属性代码中有注释

package com.example.shoppingcart01.bean;

import java.util.List;

public class ShoppBean {


    private String msg;
    private String code;
    private List<DataBean> data;
    private final String SUCCESS_CODE="0";
    public boolean isSuccess(){
        return code.equals(SUCCESS_CODE);
    }
    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;
    }

    public static class DataBean {

        private String sellerName;
        private String sellerid;
        private List<ListBean> 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<ListBean> getList() {
            return list;
        }

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

        public static class ListBean {

            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;
            //1为显示商铺, 2为隐藏商铺
            private int isFirst = 1;
            //每个商品的选中状态
            private boolean item_check;
            //商店的选中状态
            private boolean shop_check;

            public int getIsFirst() {
                return isFirst;
            }

            public void setIsFirst(int isFirst) {
                this.isFirst = isFirst;
            }

            public boolean isItem_check() {
                return item_check;
            }

            public void setItem_check(boolean item_check) {
                this.item_check = item_check;
            }

            public boolean isShop_check() {
                return shop_check;
            }

            public void setShop_check(boolean shop_check) {
                this.shop_check = shop_check;
            }

            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;
            }
        }
    }
}

6.自定义加减器的view

package com.example.shoppingcart01.custom;

import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;

import com.example.shoppingcart01.R;

public class CustomView extends LinearLayout {

    private ImageButton jian;
    private ImageButton add;
    private EditText editText;
    private int mCount = 1;
    public CustomView(Context context) {
        super(context);
    }

    public CustomView(Context context,  AttributeSet attrs) {
        super(context, attrs);
        View view = View.inflate(context,R.layout.custom_item,this);
        jian = view.findViewById(R.id.jian);
        add = view.findViewById(R.id.add);
        editText = view.findViewById(R.id.ed_num);
        //减
        jian.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String content = editText.getText().toString().trim();
                Integer count = Integer.valueOf(content);
                if(count>1){
                    mCount = count-1;
                    editText.setText(mCount+"");
                    //回调给adapter里面
                    if(customListener!=null){
                        customListener.jianjian(mCount);
                    }
                }
            }
        });
        //加
        add.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String content = editText.getText().toString().trim();
                Integer count = Integer.valueOf(content)+1;
                mCount = count;
                editText.setText(mCount+"");
                //回调给adapter里面
                if(customListener!=null){
                    customListener.jianjian(mCount);
                }
            }
        });
        //输入框
        editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                //TODO
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });
    }

    private CustomListener customListener;
    public void setCustomListener(CustomListener customListener){
        this.customListener = customListener;
    }
    //定义接口加减
    public interface CustomListener{
        void jianjian(int count);
        void shuruzhi(int count);
    }
    //这个方法共adaper设置数量时调用
    public void setEditText(int num){
        if(editText!=null){
            editText.setText(num+"");
        }
    }
}

7.适配器页面（这里操作的任务比较多）

package com.example.shoppingcart01.adaper;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.shoppingcart01.R;
import com.example.shoppingcart01.bean.ShoppBean;
import com.example.shoppingcart01.custom.CustomView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Handler;

public class ShopAdaper extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private Context mContext;
    private List<ShoppBean.DataBean.ListBean> list;
    //存放商家id和商家名称的map集合
    private Map<String,String> map = new HashMap<>();

    public ShopAdaper(Context mContext) {
        this.mContext = mContext;
    }
    /**
     * 添加数据并更新显示
     * */
    public void add(ShoppBean shoppBean){
        //传进来的是bean对象
        if(list == null){
            list = new ArrayList<>();
        }
        //第一层遍历商家和商品
        for(ShoppBean.DataBean bean:shoppBean.getData()){
            //把商品的id和商品的名称添加到map集合里 ,,为了之后方便调用
            map.put(bean.getSellerid(),bean.getSellerName());
            //第二层遍历里面的商品
            for(int i = 0;i<bean.getList().size();i++){
                //添加到list集合里
                list.add(bean.getList().get(i));
            }
        }
        //调用方法 设置显示或隐藏 商铺名
        setFirst(list);
        notifyDataSetChanged();
    }
    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.shopp_item,viewGroup,false);
        MyViewHolder viewHolder = new MyViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, final int i) {
        /**
         * 设置商铺的 shop_checkbox和商铺的名字 显示或隐藏
         * */
        final MyViewHolder holder = (MyViewHolder) viewHolder;
        if(list.get(i).getIsFirst() == 1){
            //显示商家
            holder.shop_check.setVisibility(View.VISIBLE);
            holder.shopp_commodity.setVisibility(View.VISIBLE);
            //设置选中状态
            holder.shop_check.setChecked(list.get(i).isShop_check());
            holder.shopp_commodity.setText(map.get(String.valueOf(list.get(i).getSellerid())));
        }else{
            //隐藏
            holder.shop_check.setVisibility(View.GONE);
            holder.shopp_commodity.setVisibility(View.GONE);
        }
        //拆分images字段
        String[] str = list.get(i).getImages().split("\\|");
        //设置商品的图片
        Glide.with(mContext).load(str[0]).into(holder.item_image);
        //控制商品的checkbox，根据字段改变
        holder.item_check.setChecked(list.get(i).isItem_check());
        holder.item_name.setText(list.get(i).getTitle());
        holder.item_price.setText(list.get(i).getPrice()+"");
        //调用customview里的方法设置加减号中间的数字
        holder.custom.setEditText(list.get(i).getNum());
        //商铺的shop_checkbox点击事件 ,控制商品的item_checkbox
        holder.shop_check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //先改变数据源中的shop_check
                list.get(i).setShop_check(holder.shop_check.isChecked());
                for(int a = 0;a<list.size();a++){
                    //如果是同一家商铺的 都给成相同状态
                    if(list.get(i).getSellerid() == list.get(a).getSellerid()){
                        //当前条目的选中状态 设置成 当前商铺的选中状态
                        list.get(a).setItem_check(holder.shop_check.isChecked());
                    }
                }
                //刷新适配器
                notifyDataSetChanged();
                //调用求和的方法
                sum(list);
            }
        });
        //商品的item_checkbox点击事件,控制商铺的shop_checkbox
        holder.item_check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //先改变数据源中的item_checkbox
                list.get(i).setItem_check(holder.item_check.isChecked());
                //反向控制商铺的shop_checkbox
                for(int s = 0;s<list.size();s++){
                    for(int j = 0;j<list.size();j++){
                        //如果两个商品是同一家店铺的 并且 这两个商品的item_checkbox选中状态不一样
                        if(list.get(s).getSellerid() == list.get(j).getSellerid()&&!list.get(j).isItem_check()){
                            //就把商铺的shop_checkbox改成false
                            list.get(s).setShop_check(false);
                            break;
                        }else{
                            //同一家商铺的商品 选中状态都一样,就把商铺shop_checkbox状态改成true
                            list.get(s).setShop_check(true);
                        }
                    }
                }
                //更新适配器
                notifyDataSetChanged();
                //调用求和的方法
                sum(list);
            }
        });
        //删除条目的点击事件
        holder.item_del.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //移除集合中的当前数据
                list.remove(i);
                //删除完当前的条目 重新判断商铺的显示隐藏
                setFirst(list);
                //调用重新求和
                sum(list);
                notifyDataSetChanged();
            }
        });
        //加减号的监听,
        holder.custom.setCustomListener(new CustomView.CustomListener() {
            @Override
            public void jianjian(int count) {
                //改变数据源中的数量
                list.get(i).setNum(count);
                notifyDataSetChanged();
                sum(list);
            }
            //输入值 求总价
            @Override
            public void shuruzhi(int count) {
                list.get(i).setNum(count);
                notifyDataSetChanged();
                sum(list);
            }
        });
    }
    /**
     * 设置数据源,控制是否显示商家
     * */
    private void setFirst(List<ShoppBean.DataBean.ListBean> list) {
        if(list.size()>0){
            //如果是第一条数据就设置isFirst为1
            list.get(0).setIsFirst(1);
            //从第二条开始遍历
            for(int i=1;i<list.size();i++){
                //如果和前一个商品是同一家商店的
                if(list.get(i).getSellerid() == list.get(i-1).getSellerid()){
                    //设置成2不显示商铺
                    list.get(i).setIsFirst(2);
                }else{
                    //设置成1显示商铺
                    list.get(i).setIsFirst(1);
                    //如果当前条目选中,把当前的商铺也选中
                    if(list.get(i).isItem_check() == true){
                        list.get(i).setShop_check(list.get(i).isItem_check());
                    }
                }
            }
        }
    }
    //求和的方法
    private void sum(List<ShoppBean.DataBean.ListBean> list) {
        //初始的总价为0
            int totalNum = 0;
            double totalPrice = 0.0;
            boolean allCheck = true;
            for(int i = 0;i<list.size();i++){
                //把 已经选中的 条目 计算价格
                if(list.get(i).isItem_check()){
                    totalNum += list.get(i).getNum();
                    totalPrice+= list.get(i).getNum()*list.get(i).getPrice();
                }else{
                    //如果有个未选中,就标记为false
                    allCheck = false;
                }
            }
        //接口回调出去 把总价 总数量 和allcheck 传给view层
        updateListener.setTotal(totalPrice+"",totalNum+"",allCheck);
    }
    //view层调用这个方法, 点击quanxuan按钮的操作
    public void queryAll(boolean checked){
        for(int i = 0;i<list.size();i++){
            list.get(i).setShop_check(checked);
            list.get(i).setItem_check(checked);
        }
        notifyDataSetChanged();
        sum(list);
    }
    @Override
    public int getItemCount() {
        return list==null?0:list.size();
    }
    public class MyViewHolder extends RecyclerView.ViewHolder{
        public final CheckBox shop_check;
        public final TextView shopp_commodity;
        public final CheckBox item_check;
        public final ImageView item_image;
        public final TextView item_name;
        public final TextView item_price;
        public final CustomView custom;
        public final ImageView item_del;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            shop_check = itemView.findViewById(R.id.shop_check);
            shopp_commodity = itemView.findViewById(R.id.shopp_commodity);
            item_check = itemView.findViewById(R.id.item_check);
            item_image = itemView.findViewById(R.id.item_image);
            item_name = itemView.findViewById(R.id.item_name);
            item_price = itemView.findViewById(R.id.item_price);
            custom = itemView.findViewById(R.id.custom);
            item_del = itemView.findViewById(R.id.item_del);
        }
    }

    private UpdateListener updateListener;
    public void setUpdateListener(UpdateListener updateListener){
        this.updateListener = updateListener;
    }
    //定义接口
    public interface UpdateListener{
        void setTotal(String total,String num,boolean allCheck);
    }
}

8.MainActivity页面

package com.example.shoppingcart01.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.OrientationHelper;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import com.example.shoppingcart01.R;
import com.example.shoppingcart01.adaper.ShopAdaper;
import com.example.shoppingcart01.apis.Apis;
import com.example.shoppingcart01.bean.ShoppBean;
import com.example.shoppingcart01.presenter.PresenterImpl;
import com.example.shoppingcart01.view.Iview;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity implements Iview {

    private PresenterImpl presenter;
    private RecyclerView recyclerView;
    private CheckBox query;
    private TextView text_total;
    private TextView text_shopp;
    private ShopAdaper adaper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        presenter = new PresenterImpl(this);
        initView();
    }

    private void initView() {
        //获取资源id
        recyclerView = findViewById(R.id.recycle_view);
        query = findViewById(R.id.query);
        text_total = findViewById(R.id.text_total);
        text_shopp = findViewById(R.id.text_shopp);
        //1为不选中
        query.setTag(1);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(OrientationHelper.VERTICAL);
        recyclerView.setLayoutManager(layoutManager);
        //创建适配器
        adaper = new ShopAdaper(this);
        recyclerView.setAdapter(adaper);
        //调用适配器里的接口
        adaper.setUpdateListener(new ShopAdaper.UpdateListener() {
            @Override
            public void setTotal(String total, String num, boolean allCheck) {
                //设置ui的改变
                text_shopp.setText("共"+num+"件商品");
                text_total.setText("总价:￥"+total+"元");
                if(allCheck){
                    query.setTag(2);
                }else{
                    query.setTag(1);
                }
                query.setChecked(allCheck);
            }
        });
        //这里只做ui更改, 点击全选按钮,,调到adapter里面操作
        query.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用adapter里面的方法 ,,把当前quanxuan状态传递过去
                int tag = (int) query.getTag();
                if(tag == 1){
                    query.setTag(2);
                }else{
                    query.setTag(1);
                }
                adaper.queryAll(query.isChecked());
            }
        });
        //请求网址
        Map<String,String> map = new HashMap<>();
        map.put("uid","71");
        presenter.startRequest(Apis.URL_SHOPP_CART,map,ShoppBean.class);
    }

    @Override
    public void requestData(Object o) {
        if(o instanceof ShoppBean){
            ShoppBean bean = (ShoppBean) o;
            if(bean==null || !bean.isSuccess()){
                Toast.makeText(MainActivity.this,bean.getMsg(),Toast.LENGTH_SHORT).show();
            }else{
                adaper.add(bean);
            }
        }
    }

    @Override
    public void requestFail(Object o) {
        if(o instanceof Exception){
            Exception e = (Exception) o;
            e.printStackTrace();
        }
        Toast.makeText(MainActivity.this,"网络请求错误",Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        presenter.onDetach();
    }
}

详细代码 请访问一下链接
https://github.com/guoxinyu1995/yuekao/tree/master/shoppingcart01