Activity

//    String url = "http://www.zhaoapi.cn/product/getCarts?uid=71"; //网络请求使用的地址
    String getUrl = "接口不能访问的情况下使用这个，直接复制json串";
    private ListView listView01;
    private ListView listView02;
    private List<Meau.DataBean> list = new ArrayList<>();
    private List<Meau.DataBean.ListBean> list1 = new ArrayList<>();
    private MyListViewYiAdapter adapter;
    private MyListViewErAdapter adapter1;
    private List<Meau.DataBean.ListBean> beans;
    private List<Meau.DataBean> data;
    private TextView zongjia;
    private RequestPresenter requestPresenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView01 = findViewById(R.id.listview01);
        listView02 = findViewById(R.id.listview02);
        zongjia = findViewById(R.id.zongjia);
        requestPresenter = new RequestPresenter(this);
        requestPresenter.getRequest(getUrl);
        adapter = new MyListViewYiAdapter(list, this);
        adapter1 = new MyListViewErAdapter(list1, this);
        //点击商铺切换商品
        listView01.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                List<Meau.DataBean.ListBean> beans1 = data.get(position).getList();
                list1.clear();
                adapter1.notifyDataSetChanged();
                list1.addAll(beans1);
                adapter.notifyDataSetChanged();
                adapter1.notifyDataSetChanged();
            }
        });
        adapter1.setOnNumListener(new MyListViewErAdapter.OnNumListener() {
            @Override
            public void onNum() {
                calculatePrice(data);
            }
        });
        listView01.setAdapter(adapter);
        listView02.setAdapter(adapter1);
    }

    @Override
    public void requestSuccess(Meau meau) {
        data = meau.getData();
        Log.i("abc", data.toString());
        calculatePrice(data);
        list.addAll(data);
        beans = data.get(1).getList();
        list1.addAll(beans);
        adapter.notifyDataSetChanged();
        adapter1.notifyDataSetChanged();
        Toast.makeText(this, "成功" + meau.getData(), Toast.LENGTH_LONG).show();
    }

    @Override
    public void requestFail(Meau meau) {
        Toast.makeText(this, "失败", Toast.LENGTH_LONG).show();
    }
    /**
     * @author dingtao
     * @date 2018/12/18 7:01 PM
     * 计算总价格
     */
    private void calculatePrice(List<Meau.DataBean> shopList){
        double totalPrice=0;
        int totalNum = 0;
        for (int i = 0; i < shopList.size(); i++) {//循环的商家
            Meau.DataBean shop = shopList.get(i);
            for (int j = 0; j < shop.getList().size(); j++) {
                Meau.DataBean.ListBean goods = shop.getList().get(j);
                //计算价格
                totalPrice = totalPrice + goods.getNum() * goods.getPrice();
                totalNum+=goods.getNum();//计数
            }
        }
        zongjia.setText("价格："+totalPrice+"个数:"+totalNum);
    }
    //防止内存泄漏
    @Override
    protected void onDestroy() {
        super.onDestroy();
        new RequestPresenter(this).unBindCall();
    }

Presenter

public class RequestPresenter {
    private DataCall dataCall;
    private Handler handler = new Handler(Looper.getMainLooper()){
        @Override
        public void handleMessage(Message msg) {
            Meau meau = (Meau) msg.obj;
            if (meau.getCode() == 0){
                dataCall.requestSuccess(meau);
            }else {
                dataCall.requestFail(meau);
            }
        }
    };

    public RequestPresenter(DataCall dataCall) {
        this.dataCall = dataCall;
    }

    public void getRequest(final String url){
        new Thread(new Runnable() {
            @Override
            public void run() {
                Meau data = RequestModel.getData(url);
                Message message = handler.obtainMessage();
                Log.i("aaa1",data.toString());
                message.obj = data;
                handler.sendMessage(message);
            }
        }).start();
    }
    public void unBindCall(){
        this.dataCall = null;
    }

Model

public static Meau getData(String url){
 //如果使用的是网络数据，把下一行打开，如果不是请注释掉，详情看Activity顶部，
//        String s = Utils.get(url);
        Gson gson = new Gson();
        Meau meau = gson.fromJson(url, Meau.class);
        return meau;
    }

bean

public class Meau {

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

    public int getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

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

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

    public 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 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;

            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;
            }
        }
    }

自定义接口

public interface DataCall {
    void requestSuccess(Meau meau);
    void requestFail(Meau meau);
}

自定义控件、加减符号

public class MyView extends LinearLayout implements View.OnClickListener {

    private TextView mAddBtn,mSubBtn;
    private TextView mNumText;
    private MyViewListener myViewListener;

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

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

    public MyView(Context context,AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView();
    }
    private void initView(){
        //加载layout布局，第三个参数ViewGroup一定写成this
        View view = View.inflate(getContext(),R.layout.car_add_sub_layout,this);

        mAddBtn = view.findViewById(R.id.btn_add);
        mSubBtn = view.findViewById(R.id.btn_sub);
        mNumText = view.findViewById(R.id.text_number);
        mAddBtn.setOnClickListener(this);
        mSubBtn.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        int number = Integer.parseInt(mNumText.getText().toString());

        switch (v.getId()){
            case R.id.btn_add:
                number++;
                mNumText.setText(number+"");
                break;
            case R.id.btn_sub:
                if (number==0){
                    Toast.makeText(getContext(),"数量不能小于0",Toast.LENGTH_LONG).show();
                    return;
                }
                number--;
                mNumText.setText(number+"");
                break;
        }
        if (myViewListener != null){
            myViewListener.myView(number);
        }
    }
    public void setCount(int count){
        mNumText.setText(count+"");
    }
    public void setMyViewListener(MyViewListener myViewListener) {
        this.myViewListener = myViewListener;
    }

    public interface MyViewListener{
        void myView(int count);
    }

工具类，带日志拦截器

public class Utils {
    public static String get(String url){
    //日志拦截器
        OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(new LoggingInterceptor()).build();
        Request build = new Request.Builder().url(url).get().build();
        try {
            Response execute = okHttpClient.newCall(build).execute();
            return execute.body().string();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }
}

日志拦截器，实现Interceptor

public class LoggingInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        //这个chain里面包含了request和response，所以你要什么都可以从这里拿
        Request request = chain.request();

        long t1 = System.nanoTime();//请求发起的时间
        Log.i("dt",String.format("发送请求 %s on %s%n%s",
                request.url(), chain.connection(), request.headers()));

        Response response = chain.proceed(request);

        long t2 = System.nanoTime();//收到响应的时间

        //这里不能直接使用response.body().string()的方式输出日志
        //因为response.body().string()之后，response中的流会被关闭，程序会报错，我们需要创建出一
        //个新的response给应用层处理
        ResponseBody responseBody = response.peekBody(1024 * 1024);

        Log.i("dt",String.format("接收响应: [%s] %n返回json:【%s】 %.1fms%n%s",
                response.request().url(),
                responseBody.string(),
                (t2 - t1) / 1e6d,
                response.headers()));

        return response;

    }

第一个适配器

public class MyListViewYiAdapter extends BaseAdapter {
    private List<Meau.DataBean> list = new ArrayList<>();
    private Context context;

    public MyListViewYiAdapter(List<Meau.DataBean> list, Context context) {
        this.list = list;
        this.context = context;
    }

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

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null){
            convertView = View.inflate(context, R.layout.listview_yi_layout, null);
            holder = new ViewHolder();
            holder.text_name = convertView.findViewById(R.id.text_name);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.text_name.setText(list.get(position).getSellerName());
        return convertView;
    }
    class ViewHolder{
        TextView text_name;
    }

第二个适配器

public class MyListViewErAdapter extends BaseAdapter {
    private List<Meau.DataBean.ListBean> list = new ArrayList<>();
    private Context context;

    public MyListViewErAdapter(List<Meau.DataBean.ListBean> list, Context context) {
        this.list = list;
        this.context = context;
    }

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

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        MyListViewErAdapter.ViewHolder holder;
        if (convertView == null){
            convertView = View.inflate(context, R.layout.listview_er_layout, null);
            holder = new MyListViewErAdapter.ViewHolder();
            holder.text_name = convertView.findViewById(R.id.text_name);
            holder.text_price = convertView.findViewById(R.id.text_price);
            holder.img_pic = convertView.findViewById(R.id.img_pic);
            holder.myView = convertView.findViewById(R.id.myView);
            convertView.setTag(holder);
        }else {
            holder = (MyListViewErAdapter.ViewHolder) convertView.getTag();
        }
        holder.text_name.setText(list.get(position).getTitle());
        holder.text_price.setText(list.get(position).getPrice()+"");
        String images = list.get(position).getImages();
        String[] split = images.split("\\|");
        if (split.length > 0) {
            Glide.with(context).load(split[0]).into(holder.img_pic);
        }
        Log.i("asdf",list.get(position).getTitle());
        holder.myView.setCount(list.get(position).getNum());
        holder.myView.setMyViewListener(new MyView.MyViewListener() {
            @Override
            public void myView(int count) {
                    list.get(position).setNum(count);
                    onNumListener.onNum();
            }
        });
        return convertView;
    }
    class ViewHolder{
        TextView text_name,text_price;
        ImageView img_pic;
        MyView myView;
    }
    private OnNumListener onNumListener;

    public void setOnNumListener(OnNumListener onNumListener) {
        this.onNumListener = onNumListener;
    }
    public interface OnNumListener{
        void onNum();
    }

Activity布局

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="9"
        android:orientation="horizontal">

        <ListView
            android:id="@+id/listview01"
            android:layout_width="200dp"
            android:layout_height="match_parent"
            android:background="#ccc" />

        <ListView
            android:id="@+id/listview02"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>

    <TextView
        android:id="@+id/zongjia"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:text="总价:0￥"
        android:gravity="center"
        android:textColor="#7FFF00"/>

自定义控件布局

<TextView
        android:id="@+id/btn_add"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:focusable="false"
        android:textSize="20sp"
        android:gravity="center"
        android:text="+" />

    <TextView
        android:id="@+id/text_number"
        android:layout_width="60dp"
        android:layout_height="30dp"
        android:gravity="center"
        android:textSize="14sp"
        android:text="0" />

    <TextView
        android:id="@+id/btn_sub"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:textSize="20sp"
        android:focusable="false"
        android:gravity="center"
        android:text="-" />

适配器第一个布局

<TextView
        android:id="@+id/text_name"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="商铺名称"
        android:gravity="center"
        android:textColor="#fff"
        android:textSize="18sp"/>

适配器第二个布局

<ImageView
        android:id="@+id/img_pic"
        android:layout_width="188dp"
        android:layout_height="188dp"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/text_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="商铺名称"
        android:layout_marginLeft="189dp"
        android:textColor="#0f0"
        android:textSize="16sp" />

    <TextView
        android:id="@+id/text_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="价格"
        android:layout_marginTop="100dp"
        android:textColor="#f00"
        android:textSize="18sp"
        android:layout_marginLeft="189dp"/>

    <com.bwie.myelm.core.MyView
        android:id="@+id/myView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="160dp"
        android:layout_marginLeft="258dp"/>