Android购物车

最新推荐文章于 2023-06-06 09:08:38 发布

原创最新推荐文章于 2023-06-06 09:08:38 发布 · 8.9k 阅读

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CC 4.0 BY-SA版权

本文详细介绍了Android购物车的实现，从主页面布局到商品展示，包括自定义加减按钮、商家信息、商品详情，以及adapter、网络请求、自定义属性、presenter和bean的数据处理等方面，全面讲解了整个购物车功能的开发流程。

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在这里插入图片描述

1.主页面的布局

<?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="match_parent">

    <ExpandableListView
        android:id="@+id/el_cart"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="60dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:background="#eeeeee"
        android:gravity="center_vertical">

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

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="全选" />

        <TextView
            android:id="@+id/tv_cart_total_price"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:paddingLeft="20dp"
            android:text="合计:¥0.00" />

        <Button
            android:id="@+id/btn_cart_pay"
            android:layout_width="100dp"
            android:layout_height="match_parent"
            android:text="去结算(0)" />
    </LinearLayout>

</RelativeLayout>

2.自定义加减的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="60dp"
    android:layout_height="30dp"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/sub_tv"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="-"
        android:textSize="20sp"
        android:gravity="center"/>
    <TextView
        android:id="@+id/product_number_tv"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="1"
        android:textSize="20sp"
        android:gravity="center"/>
    <TextView
        android:id="@+id/add_tv"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="+"
        android:textSize="20sp"
        android:gravity="center"/>

</LinearLayout>

3.商家的布局

<?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="60dp"
    android:gravity="center_vertical">

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

    <TextView
        android:id="@+id/seller_name_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:text="Name"/>
</LinearLayout>

4.商品的布局

<?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:gravity="center_vertical">

    <CheckBox
        android:id="@+id/child_cb"
        android:layout_marginLeft="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/product_icon_iv"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginLeft="20dp"
        android:scaleType="centerCrop"
        android:src="@color/colorPrimary" />

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

        <TextView
            android:id="@+id/product_title_name_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:maxLines="2"
            android:text="商品标题" />

        <TextView
            android:id="@+id/product_price_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="¥0.0" />
    </LinearLayout>

    <com.bawie.www.shop2.MyAddSubView
        android:id="@+id/add_remove_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp" />
</LinearLayout>

5.Main主页面

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    String url = "http://www.zhaoapi.cn/product/getCarts";
    private ExpandableListView el_cart;
    private CheckBox cb_cart_all_select;
    private TextView tv_cart_total_price;
    private Button btn_cart_pay;
    private MyAdapter mMyAdapter;

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

    private void initData() {
        Map<String,String> map = new HashMap<>();
        map.put("uid","71");
        NewsPresenter newsPresenter = new NewsPresenter();
        newsPresenter.requestPresenter(url, map, new NewsPresenter.HttpPresenter() {
            @Override
            public void success(List<News.DataBean> data) {
                //创建adapter
                mMyAdapter = new MyAdapter(MainActivity.this, data);
                mMyAdapter.setOnCartListChangeListener(new MyAdapter.onCartListChangeListener() {
                    @Override
                    public void onSellerCheckedChange(int groupPosition) {
                        //B.判断当前商家所有商品是否被选中 (一种是所有的都被选中,一种是没有所有的都选中)
                        boolean currentSellerAllProductSelected = mMyAdapter.isCurrentSellerAllProductSelected(groupPosition);
                        //提示为什么!currentSellerAllProductSelected取反,因为像灯一样,亮为true,暗为false,我先看灯是亮的,true,那么
                        //我要把他关了,取反把true改为false,然后设置进去,那么每一次我按钮的时候,都是拿到当前的状态,取反,再设置进去
                        //C.当商家的全选框点击时,更新所有商品全选的状态
                        mMyAdapter.changeCurrentSellerAllProductsStatus(groupPosition,!currentSellerAllProductSelected);
                        mMyAdapter.notifyDataSetChanged();
                        //刷新底部
                        refreshSelectedAndTotalPriceAndTotalNumber();
                    }

                    @Override
                    public void onProductCheckedChange(int groupPosition, int childPosition) {
                        //C.当商品的全选框选中时,更新商家选框的状态
                        mMyAdapter.changeCurrentProductStatus(groupPosition,childPosition);
                        mMyAdapter.notifyDataSetChanged();
                        refreshSelectedAndTotalPriceAndTotalNumber();
                    }

                    @Override
                    public void onProducNumberChange(int groupPosition, int childPosition, int number) {
                        //C.当加减器被点击时,改变里面当前商品的数量
                        mMyAdapter.changeCurrentProductNumber(groupPosition,childPosition,number);
                        mMyAdapter.notifyDataSetChanged();
                        refreshSelectedAndTotalPriceAndTotalNumber();
                    }
                });


                el_cart.setAdapter(mMyAdapter);
                //展开二级列表
                //展开二级列表
                for(int x=0; x<data.size(); x++){
                    el_cart.expandGroup(x);
                }
            }

            @Override
            public void failed() {

            }
        });


    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.cb_cart_all_select:
                //B.底部有一个全选按钮的逻辑,也要判断,不过范围更大, 是所有的商品是否被选中 
                boolean allProductsSelected = mMyAdapter.isAllProductsSelected();
                //C.当最底部的全选框选中时,更新所有商品全选框的状态
                mMyAdapter.changeAllProductStatus(!allProductsSelected);
                mMyAdapter.notifyDataSetChanged();
                //刷新底部的数据显示
                refreshSelectedAndTotalPriceAndTotalNumber();
                break;
        }
    }

    //B.刷新底部全选框,textVIew和Button的UI,改变了CheckBox状态,总价,总数量
    private void refreshSelectedAndTotalPriceAndTotalNumber(){
        //去判断是否所有的商品都被选中
        //B.底部有一个全选按钮的逻辑,也要判断,不过范围更大, 是所有的商品是否被选中
        boolean allProductsSelected = mMyAdapter.isAllProductsSelected();
        //把这个值设置给checkBox
        cb_cart_all_select.setChecked(allProductsSelected);

        //计算总计
        //B.计算所有商品总的价格
        float totalPrice = mMyAdapter.calculateTotalPrice();
        tv_cart_total_price.setText("总计"+totalPrice);

        //计算总数量
        //B.计算商品总的数量
        int totalNumber = mMyAdapter.calculateTotalNumber();
        btn_cart_pay.setText("去结算("+totalNumber+")");

    }


    private void initView() {
        el_cart = (ExpandableListView) findViewById(R.id.el_cart);
        cb_cart_all_select = (CheckBox) findViewById(R.id.cb_cart_all_select);
        tv_cart_total_price = (TextView) findViewById(R.id.tv_cart_total_price);
        btn_cart_pay = (Button) findViewById(R.id.btn_cart_pay);

        cb_cart_all_select.setOnClickListener(this);
    }
}

6.adapter

public class MyAdapter extends BaseExpandableListAdapter {
    private Context mContext;
    private List<News.DataBean> mSellerData;

    public MyAdapter(Context context, List<News.DataBean> sellerData) {
        mContext = context;
        mSellerData = sellerData;
    }


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

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


    //商家
    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        News.DataBean dataBean = mSellerData.get(groupPosition);
        ParentViewHolder parentViewHolder;
        if (convertView == null) {
            convertView = View.inflate(mContext, R.layout.item_parent, null);
            parentViewHolder = new ParentViewHolder(convertView);
            convertView.setTag(parentViewHolder);
        } else {
            parentViewHolder = (ParentViewHolder) convertView.getTag();
        }
        //设置商家名称
        parentViewHolder.seller_name_tv.setText(dataBean.getSellerName());
        //B.判断当前商家所有商品是否被选中 (一种是所有的都被选中,一种是没有所有的都选中)
        boolean currentSellerAllProductSeleted = isCurrentSellerAllProductSelected(groupPosition);
        parentViewHolder.seller_cb.setChecked(currentSellerAllProductSeleted);

        //设置点击事件
        parentViewHolder.seller_cb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                /**
                 * 当商家的checkBox点击时回调
                 */
                mOnCartListChangeListener.onSellerCheckedChange(groupPosition);
            }
        });
        return convertView;
    }

    //商品
    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        News.DataBean dataBean = mSellerData.get(groupPosition);
        List<News.DataBean.ListBean> list = dataBean.getList();
        ChildViewHolder childViewHolder;
        if (convertView == null) {
            convertView = View.inflate(mContext, R.layout.item_child, null);
            childViewHolder = new ChildViewHolder(convertView);
            convertView.setTag(childViewHolder);
        }else {
            childViewHolder = (ChildViewHolder) convertView.getTag();
        }
        //设置图片并剪切
        String images = list.get(childPosition).getImages();
        String[] image = images.split("!");
        Picasso.with(mContext).load(image[0]).into(childViewHolder.product_icon_iv);
        //设置商家名称
        childViewHolder.product_title_name_tv.setText(list.get(childPosition).getTitle());
        //设置单价
        childViewHolder.product_price_tv.setText(list.get(childPosition).getPrice() + "");
        //设置复选框是否选中 1是选中
        childViewHolder.child_cb.setChecked(list.get(childPosition).getSelected() == 1);
        //设置内部的数量
        childViewHolder.add_remove_view.setNumber(list.get(childPosition).getNum());

        childViewHolder.child_cb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                /**
                 * 当点击子条目商品的CheckBox回调
                 */
                mOnCartListChangeListener.onProductCheckedChange(groupPosition,childPosition);
            }
        });
        childViewHolder.add_remove_view.setOnNumberChangeListener(new MyAddSubView.OnNumberChangeListener() {
            @Override
            public void onNumberChange(int num) {
                /**
                 * 当点击加减按钮的回调
                 */
                mOnCartListChangeListener.onProducNumberChange(groupPosition,childPosition,num);
            }
        });
        return convertView;
    }
    ////////////////////////B.写一些购物车的特有的方法//////////////////////////
    /**
     * B.判断当前商家所有商品是否被选中
     * (一种是所有的都被选中,一种是没有所有的都选中)
     */
    public boolean isCurrentSellerAllProductSelected(int groupPosition) {
        //拿到对应组的数据
        News.DataBean dataBean = mSellerData.get(groupPosition);
        //拿到商家的所有商品数据,是一个集合
        List<News.DataBean.ListBean> list = dataBean.getList();

        for (News.DataBean.ListBean listBean : list) {
            //判断这个组的所有商品是否被选中,如果有一个没有被选中,那么商家就是未选中状态
            if (listBean.getSelected() == 0) {
                return false;
            }
        }
        return true;
    }
    /**
     * B.底部有一个全选按钮的逻辑,也要判断,不过范围更大,
     * 是所有的商品是否被选中
     * (一种是所有的都被选中,一种是没有所有的都选中)
     */
    public boolean isAllProductsSelected(){
        for (int i = 0; i < mSellerData.size(); i++) {
            News.DataBean dataBean = mSellerData.get(i);
            List<News.DataBean.ListBean> list = dataBean.getList();
            for (int j = 0; j < list.size(); j++) {
                if (list.get(j).getSelected() == 0){
                    return false;
                }
            }
        }
        return true;
    }
    /**
     * B.计算商品总的数量
     */
    public int calculateTotalNumber(){
        int totalNumber = 0;
        for (int i = 0; i < mSellerData.size(); i++) {
            News.DataBean dataBean = mSellerData.get(i);
            List<News.DataBean.ListBean> list = dataBean.getList();
            for (int j = 0; j < list.size(); j++) {
                //商品数量只算选中
                if (list.get(j).getSelected() == 1){
                    //拿到了商品的数量
                    int num = list.get(j).getNum();
                    totalNumber +=num;
                }
            }
        }
        return totalNumber;
    }
    /**
     * B.计算所有商品总的价格
     */
    public float calculateTotalPrice(){
        float totalPrice = 0;
        for (int i = 0; i < mSellerData.size(); i++) {
            News.DataBean dataBean = mSellerData.get(i);
            List<News.DataBean.ListBean> list = dataBean.getList();
            for (int j = 0; j < list.size(); j++) {
                //商品价格只算选中
                if (list.get(j).getSelected() == 1){
                    //拿到商品的价格
                    float price = (float) list.get(j).getPrice();
                    //拿到了商品的数量
                    int num = list.get(j).getNum();
                    totalPrice +=price * num;
                }
            }
        }
        return totalPrice;
    }

    /////////////////////////////////////C.根据用户的选择,改变选框里的状态///////////////////////////////////
    /**
     * C.当商家的全选框点击时,更新所有商品全选的状态
     */
    public void changeCurrentSellerAllProductsStatus(int groupPosition , boolean isSelected){
        News.DataBean dataBean = mSellerData.get(groupPosition);
        List<News.DataBean.ListBean> list = dataBean.getList();
        for (int i = 0; i < list.size(); i++) {
            News.DataBean.ListBean listBean = list.get(i);
            listBean.setSelected(isSelected ? 1 : 0);
        }
    }
    /**
     * C.当商品的全选框选中时,更新商家选框的状态
     */
    public void changeCurrentProductStatus(int groupPosition , int childPositon){
        News.DataBean dataBean = mSellerData.get(groupPosition);
        List<News.DataBean.ListBean> list = dataBean.getList();
        News.DataBean.ListBean listBean = list.get(childPositon);
        listBean.setSelected(listBean.getSelected() == 0 ? 1 : 0);
    }
    /**
     * C.当最底部的全选框选中时,更新所有商品全选框的状态
     */
    public void changeAllProductStatus(boolean isSelected){
        for (int i = 0; i < mSellerData.size(); i++) {
            News.DataBean dataBean = mSellerData.get(i);
            List<News.DataBean.ListBean> list = dataBean.getList();
            for (int j = 0; j < list.size(); j++) {
                list.get(j).setSelected(isSelected ? 1 : 0);
            }
        }
    }
    /**
     * C.当加减器被点击时,改变里面当前商品的数量
     * 参数1定位那个商家
     * 参数2定位哪个商品
     * 参数3定位改变具体的数量是多少
     */
    public void changeCurrentProductNumber(int groupPosition,int childPositon,int number){
        News.DataBean dataBean = mSellerData.get(groupPosition);
        List<News.DataBean.ListBean> list = dataBean.getList();
        News.DataBean.ListBean listBean = list.get(childPositon);
        listBean.setNum(number);
    }

    /////////////////////////D.定义接口的固定形式////////////////////

    public interface onCartListChangeListener{

        /**
         *当商家的checkBox点击时回调
         */
        void onSellerCheckedChange(int groupPosition);

        /**
         * 当点击子条目商品的CheckBox回调
         */
        void onProductCheckedChange(int groupPosition ,int childPosition);

        /**
         * 当点击加减按钮的回调
         */
        void onProducNumberChange(int groupPosition , int childPosition , int number);

    }
    //D.
    onCartListChangeListener mOnCartListChangeListener;
    //D.设置一个监听加减按钮,商家的复选框,子条目的复选框
    public void setOnCartListChangeListener(onCartListChangeListener onCartListChangeListener){
        mOnCartListChangeListener = onCartListChangeListener ;
    }

    /**
     *一些没有用的数据
     * @param groupPosition
     * @return
     */
    @Override
    public Object getGroup(int groupPosition) {
        return null;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return null;
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

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

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

    public static class ParentViewHolder {
        public View rootView;
        public CheckBox seller_cb;
        public TextView seller_name_tv;

        public ParentViewHolder(View rootView) {
            this.rootView = rootView;
            this.seller_cb = (CheckBox) rootView.findViewById(R.id.seller_cb);
            this.seller_name_tv = (TextView) rootView.findViewById(R.id.seller_name_tv);
        }

    }

    public static class ChildViewHolder {
        public View rootView;
        public CheckBox child_cb;
        public ImageView product_icon_iv;
        public TextView product_title_name_tv;
        public TextView product_price_tv;
        public MyAddSubView add_remove_view;

        public ChildViewHolder(View rootView) {
            this.rootView = rootView;
            this.child_cb = (CheckBox) rootView.findViewById(R.id.child_cb);
            this.product_icon_iv = (ImageView) rootView.findViewById(R.id.product_icon_iv);
            this.product_title_name_tv = (TextView) rootView.findViewById(R.id.product_title_name_tv);
            this.product_price_tv = (TextView) rootView.findViewById(R.id.product_price_tv);
            this.add_remove_view = (MyAddSubView) rootView.findViewById(R.id.add_remove_view);
        }

    }
}

7.网络请求

public class OkhtttpUtils {

    private static OkhtttpUtils mOkhtttpUtils;
    private OkHttpClient mOkHttpClien;
    private final Handler mHandler;
    private OkhtttpUtils(){
        //创建一个主线程的handler
        mHandler = new Handler(Looper.getMainLooper());
        mOkHttpClien = new OkHttpClient.Builder()
                .connectTimeout(5000, TimeUnit.MILLISECONDS)
                .readTimeout(5000, TimeUnit.MILLISECONDS)
                .writeTimeout(5000, TimeUnit.MILLISECONDS)
                .build();
    }
    public static OkhtttpUtils getInstance(){
        if (mOkhtttpUtils == null){
            synchronized (OkhtttpUtils.class){
                if (mOkhtttpUtils == null){
                    return mOkhtttpUtils = new OkhtttpUtils();
                }
            }
        }
        return mOkhtttpUtils;
    }
    public interface OkCallback {
        void onFailure(Exception e);
        void onResponse(String json);
    }

    //封装doGet的网络请求
    public void doGet(String url, final OkCallback okCallback) {
        Request request = new Request.Builder()
                .get()
                .url(url)
                .build();

        final Call call = mOkHttpClien.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                //切换到主线程
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        okCallback.onFailure(e);
                    }
                });
            }
            @Override
            public void onResponse(Call call, final Response response) throws IOException {
                final String json = response.body().string();
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        okCallback.onResponse(json);
                        return;
                    }
                });
            }
        });
    }

    public void doPost(String url, Map<String,String> map , final OkCallback okCallback){
        FormBody.Builder builder = new FormBody.Builder();
        for(String key:map.keySet()){
            builder.add(key,map.get(key));
        }
        FormBody formBody = builder.build();
        //创建Request对象
        Request request = new Request.Builder()
                .post(formBody)
                .url(url)
                .build();
        //创建Call对象
        final Call call = mOkHttpClien.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                //切换到主线程
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        okCallback.onFailure(e);
                    }
                });
            }
            @Override
            public void onResponse(Call call, final Response response) throws IOException {
                final String json = response.body().string();
                        mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            okCallback.onResponse(json);
                    }
                });
            }
        });
    }
}

8.自定义属性

public class MyAddSubView extends LinearLayout implements View.OnClickListener {
    private int number = 1;
    private TextView sub_tv;
    private TextView product_number_tv;
    private TextView add_tv;

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

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

    public MyAddSubView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        View view = inflate(context, R.layout.add_remove_view_layout, this);

        sub_tv=view.findViewById(R.id.sub_tv);
        product_number_tv=view.findViewById(R.id.product_number_tv);
        add_tv=view.findViewById(R.id.add_tv);


        sub_tv.setOnClickListener(this);
        add_tv.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.sub_tv:
                if (number > 1) {
                    --number;
                    product_number_tv.setText(number + "");
                    if (onNumberChangeListener != null) {
                        onNumberChangeListener.onNumberChange(number);
                    }
                } else {
                    Toast.makeText(getContext(), "不能再少了", Toast.LENGTH_SHORT).show();
                }
                break;


            case R.id.add_tv:
                ++number;
                product_number_tv.setText(number + "");
                if (onNumberChangeListener != null) {
                    onNumberChangeListener.onNumberChange(number);
                }
                break;
        }
    }


    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
        product_number_tv.setText(number + "");
    }

    OnNumberChangeListener onNumberChangeListener;

    public void setOnNumberChangeListener(OnNumberChangeListener onNumberChangeListener) {
        this.onNumberChangeListener = onNumberChangeListener;
    }

    interface OnNumberChangeListener {
        void onNumberChange(int num);
    }
}

9.presenter

public class NewsPresenter {
    public void requestPresenter(String url, Map<String,String> map, final HttpPresenter httpPresenter){
        OkhtttpUtils instance = OkhtttpUtils.getInstance();
        instance.doPost(url, map, new OkhtttpUtils.OkCallback() {
            @Override
            public void onFailure(Exception e) {
                httpPresenter.failed();
            }

            @Override
            public void onResponse(String json) {
                News news = new Gson().fromJson(json, News.class);
                List<News.DataBean> data = news.getData();
                httpPresenter.success(data);
            }
        });
    }

    public interface HttpPresenter{
        void success(List<News.DataBean> data);
        void failed();
    }
}

10.bean

public class News {

    /**
     * msg : 请求成功
     * code : 0
     * data : [{"list":[{"bargainPrice":11800,"createtime":"2017-10-14T21:38:26","detailUrl":"https://mitem.jd.hk/ware/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1","images":"https://m.360buyimg.com/n0/jfs/t6130/97/1370670410/180682/1109582a/593276b1Nd81fe723.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5815/178/2614671118/51656/7f52d137/593276c7N107b725a.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5878/60/2557817477/30873/4502b606/593276caN5a7d6357.jpg!q70.jpg","num":2,"pid":80,"price":777,"pscid":40,"selected":0,"sellerid":1,"subhead":"购买电脑办公部分商品满1元返火车票5元优惠券（返完即止）","title":"全球购 新款Apple MacBook Pro 苹果笔记本电脑 银色VP2新13英寸Bar i5/8G/256G"},{"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":8,"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":6666,"createtime":"2017-10-10T16:01:31","detailUrl":"https://item.m.jd.com/product/5089273.html?utm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t8284/363/1326459580/71585/6d3e8013/59b857f2N6ca75622.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t9346/182/1406837243/282106/68af5b54/59b8480aNe8af7f5c.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t8434/54/1359766007/56140/579509d9/59b85801Nfea207db.jpg!q70.jpg","num":1,"pid":46,"price":234,"pscid":39,"selected":0,"sellerid":2,"subhead":"【iPhone新品上市】新一代iPhone，让智能看起来更不一样","title":"Apple iPhone 8 Plus (A1864) 64GB 金色 移动联通电信4G手机"}],"sellerName":"商家2","sellerid":"2"},{"list":[{"bargainPrice":5599,"createtime":"2017-10-10T17:30:32","detailUrl":"https://item.m.jd.com/product/4824715.html?utm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends","images":"https://m.360buyimg.com/n12/jfs/t7768/184/1153704394/148460/f42e1432/599a930fN8a85626b.jpg!q70.jpg","num":1,"pid":59,"price":5599,"pscid":40,"selected":0,"sellerid":3,"subhead":"游戏本选择4G独显，拒绝掉帧】升级版IPS全高清防眩光显示屏，WASD方向键颜色加持，三大出风口立体散热！","title":"戴尔DELL灵越游匣15PR-6648B GTX1050 15.6英寸游戏笔记本电脑(i5-7300HQ 8G 128GSSD+1T 4G独显 IPS)黑"},{"bargainPrice":1599,"createtime":"2017-10-14T21:48:08","detailUrl":"https://item.m.jd.com/product/1993026402.html?utm#_source=androidapp&utm#_medium=appshare&utm#_campaign=t#_335139774&utm#_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t5863/302/8961270302/97126/41feade1/5981c81cNc1b1fbef.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7003/250/1488538438/195825/53bf31ba/5981c57eN51e95176.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5665/100/8954482513/43454/418611a9/5981c57eNd5fc97ba.jpg!q70.jpg","num":1,"pid":47,"price":111,"pscid":39,"selected":0,"sellerid":3,"subhead":"碳黑色 32GB 全网通 官方标配   1件","title":"锤子 坚果Pro 特别版 巧克力色 酒红色 全网通 移动联通电信4G手机 双卡双待 碳黑色 32GB 全网通"}],"sellerName":"商家3","sellerid":"3"},{"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":6,"pid":11,"price":8989,"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 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i5/8G/256G"},{"bargainPrice":111.99,"createtime":"2017-10-03T23:53:28","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":3,"price":198,"pscid":1,"selected":1,"sellerid":19,"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19","sellerid":"19"},{"list":[{"bargainPrice":11800,"createtime":"2017-10-03T23:53:28","detailUrl":"https://mitem.jd.hk/ware/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1","images":"https://m.360buyimg.com/n0/jfs/t6130/97/1370670410/180682/1109582a/593276b1Nd81fe723.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5815/178/2614671118/51656/7f52d137/593276c7N107b725a.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5878/60/2557817477/30873/4502b606/593276caN5a7d6357.jpg!q70.jpg","num":2,"pid":76,"price":37999.99,"pscid":40,"selected":1,"sellerid":20,"subhead":"购买电脑办公部分商品满1元返火车票5元优惠券（返完即止）","title":"全球购 新款Apple MacBook Pro 苹果笔记本电脑 银色VP2新13英寸Bar i5/8G/256G"},{"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":4,"pid":4,"price":999,"pscid":1,"selected":0,"sellerid":20,"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"},{"bargainPrice":22.9,"createtime":"2017-10-14T21:38:26","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":3,"pid":43,"price":678,"pscid":2,"selected":0,"sellerid":20,"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20","sellerid":"20"},{"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":3,"pid":44,"price":789,"pscid":2,"selected":0,"sellerid":21,"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21","sellerid":"21"},{"list":[{"bargainPrice":11800,"createtime":"2017-10-14T21:38:26","detailUrl":"https://mitem.jd.hk/ware/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1","images":"https://m.360buyimg.com/n0/jfs/t6130/97/1370670410/180682/1109582a/593276b1Nd81fe723.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5815/178/2614671118/51656/7f52d137/593276c7N107b725a.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5878/60/2557817477/30873/4502b606/593276caN5a7d6357.jpg!q70.jpg","num":1,"pid":78,"price":999,"pscid":40,"selected":0,"sellerid":22,"subhead":"购买电脑办公部分商品满1元返火车票5元优惠券（返完即止）","title":"全球购 新款Apple MacBook Pro 苹果笔记本电脑 银色VP2新13英寸Bar i5/8G/256G"}],"sellerName":"商家22","sellerid":"22"},{"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":7,"price":120.01,"pscid":1,"selected":0,"sellerid":23,"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23","sellerid":"23"}]
     */

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

    public String getMsg() {
        return msg;
    }

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

    public String getCode() {
        return code;
    }

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

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

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

    public static class DataBean {
        /**
         * list : [{"bargainPrice":11800,"createtime":"2017-10-14T21:38:26","detailUrl":"https://mitem.jd.hk/ware/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1","images":"https://m.360buyimg.com/n0/jfs/t6130/97/1370670410/180682/1109582a/593276b1Nd81fe723.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5815/178/2614671118/51656/7f52d137/593276c7N107b725a.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5878/60/2557817477/30873/4502b606/593276caN5a7d6357.jpg!q70.jpg","num":2,"pid":80,"price":777,"pscid":40,"selected":0,"sellerid":1,"subhead":"购买电脑办公部分商品满1元返火车票5元优惠券（返完即止）","title":"全球购 新款Apple MacBook Pro 苹果笔记本电脑 银色VP2新13英寸Bar i5/8G/256G"},{"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":8,"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<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 {
            /**
             * bargainPrice : 11800.0
             * createtime : 2017-10-14T21:38:26
             * detailUrl : https://mitem.jd.hk/ware/view.action?wareId=1988853309&cachekey=1acb07a701ece8d2434a6ae7fa6870a1
             * images : https://m.360buyimg.com/n0/jfs/t6130/97/1370670410/180682/1109582a/593276b1Nd81fe723.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5698/110/2617517836/202970/c9388feb/593276b7Nbd94ef1f.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5815/178/2614671118/51656/7f52d137/593276c7N107b725a.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t5878/60/2557817477/30873/4502b606/593276caN5a7d6357.jpg!q70.jpg
             * num : 2
             * pid : 80
             * price : 777.0
             * pscid : 40
             * selected : 0
             * sellerid : 1
             * subhead : 购买电脑办公部分商品满1元返火车票5元优惠券（返完即止）
             * title : 全球购 新款Apple MacBook Pro 苹果笔记本电脑 银色VP2新13英寸Bar i5/8G/256G
             */

            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;
            }
        }
    }
}

注意:


购物车网址:http://www.zhaoapi.cn/product/getCarts
<uses-permission android:name="android.permission.INTERNET"/>
implementation 'com.squareup.okhttp3:okhttp:3.12.0'
   implementation 'com.squareup.picasso:picasso:2.3.2'
    implementation 'com.google.code.gson:gson:2.2.4'