淘宝购物车功能的实现

//导入依赖
compile 'com.android.support:recyclerview-v7:25.3.1'
compile 'com.google.code.gson:gson:2.8.2'
compile 'com.squareup.picasso:picasso:2.5.1'



//主类
public class MainActivity extends AppCompatActivity {    @BindView(R.id.rv)    RecyclerView rv;    @BindView(R.id.checkbox)    CheckBox checkbox;    @BindView(R.id.tv)    TextView tv;    @BindView(R.id.bt)    Button bt;    List<ShopBean.OrderDataBean.CartlistBean> list = new ArrayList<ShopBean.OrderDataBean.CartlistBean>();    private LinearLayoutManager manager;    private ShopAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);
    //上面可以使用网络请求数据，进行解析
       try {            InputStream inputStream = getAssets().open("shop.json");            String data = convertStreamToString(inputStream);            Gson gson = new Gson();            ShopBean shopBean = gson.fromJson(data, ShopBean.class);            for (int i = 0; i < shopBean.getOrderData().size(); i++) {                int length = shopBean.getOrderData().get(i).getCartlist().size();                for (int j = 0; j < length; j++) {                    list.add(shopBean.getOrderData().get(i).getCartlist().get(j));                }            }              //设置线性布局            manager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);            rv.setLayoutManager(manager);
             //进行适配 
           adapter = new ShopAdapter(this,list);            rv.setAdapter(adapter);
            adapter.setCheckListener(new ShopAdapter.CheckListener() {                @Override                public void check(boolean check, int position) {                    boolean allCheck = true ;                    float price  = 0 ;                    int count = 0;                    for (int i = 0; i < list.size(); i++) {                        if (list.get(i).isSelect()) {                            price += list.get(i).getPrice() * list.get(i).getCount();                            count++;                        }                    }                    for (int i = 0; i < list.size(); i++) {                        if (!list.get(i).isSelect()) {                            allCheck = false;                            break;                        }                    }                    tv.setText(price+"元");                    bt.setText("结算（"+count+")");                    if(allCheck){                        checkbox.setChecked(true);                    }else {                        checkbox.setChecked(false);                    }                }            });        } catch (IOException e) {            e.printStackTrace();        }    }    @OnClick({R.id.checkbox, R.id.bt})    public void onViewClicked(View view) {        switch (view.getId()) {            case R.id.checkbox:                boolean check =   checkbox.isChecked() ;                float price  = 0 ;                int count = 0;                for (int i = 0; i < list.size(); i++) {                    list.get(i).setSelect(check);                    if(check){                        if (list.get(i).isSelect()) {                            price += list.get(i).getPrice() * list.get(i).getCount();                            count++;                        }                    }                }                adapter.notifyDataSetChanged();                tv.setText("￥"+price);                bt.setText("结算（"+count+")");                break;            case R.id.bt:                break;        }    }    public  String convertStreamToString(InputStream is) {        BufferedReader reader = new BufferedReader(new InputStreamReader(is));        StringBuilder sb = new StringBuilder();        String line = null;        try {            while ((line = reader.readLine()) != null) {                sb.append(line);            }        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                is.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return sb.toString();    }}


// 适配器
public class ShopAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private Context context;
    private List<ShopBean.OrderDataBean.CartlistBean> list;

    public ShopAdapter(Context context, List<ShopBean.OrderDataBean.CartlistBean> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.adapter_item, parent, false);
        MyViewHolder viewHolder = new MyViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
     if(holder instanceof  MyViewHolder){
         MyViewHolder myViewHolder = (MyViewHolder) holder;
         myViewHolder.danjia.setText(list.get(position).getPrice()+"");
         Picasso.with(context).load(list.get(position).getDefaultPic()).into(myViewHolder.shopface);
         if(list.get(position).isSelect()){
             if(!myViewHolder.checkbox.isChecked()){
                 myViewHolder.checkbox.setChecked(true);
             }
         } else {
             myViewHolder.checkbox.setChecked(false);
         }

         myViewHolder.checkbox.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {

                 boolean isChecked = list.get(position).isSelect() ;
                 list.get(position).setSelect(!isChecked);
                 notifyDataSetChanged();
                 if(listener != null){
                     listener.check(!isChecked,position);
                 }

             }
         });
         myViewHolder.customviewid.setListener(new MyView.ChangeListener() {
             @Override
             public void onChange(int count) {
                 list.get(position).setCount(count);
                 notifyDataSetChanged();
                 if(listener != null){
                     listener.check(list.get(position).isSelect(),position);
                 }
             }
         });
      }
    }

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

    static class MyViewHolder extends RecyclerView.ViewHolder{
        @BindView(R.id.checkbox)
        CheckBox checkbox;
        @BindView(R.id.shopface)
        ImageView shopface;
        @BindView(R.id.price)
        TextView danjia;
        @BindView(R.id.customviewid)
        MyView customviewid;
        MyViewHolder(View view) {
            super(view);
            ButterKnife.bind(this, view);
        }
    }
    public CheckListener listener;
    public void setCheckListener(CheckListener listener){
        this.listener = listener ;
    }
    interface CheckListener {
        public void check(boolean check,int position);
    }

}
//自定义购物车的加减按钮
public class MyView extends LinearLayout {

    private EditText content;

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

    public MyView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }
    private  void init(Context context){
        View view =  LayoutInflater.from(context).inflate(R.layout.view_layout,null);
        addView(view);
        Button revserse = (Button) view.findViewById(R.id.revserse);
        Button add = (Button) view.findViewById(R.id.add);
        content = (EditText) view.findViewById(R.id.content);

        revserse.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String  result =   content.getText().toString().trim() ;
                int integerResult =  Integer.valueOf(result);
                if(integerResult > 1){
                    integerResult = integerResult - 1 ;
                    content.setText(integerResult+"");
                    if(listener != null){
                        listener.onChange(integerResult);
                    }
                }
            }
        });

        add.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String  result =   content.getText().toString().trim() ;
                int integerResult =  Integer.valueOf(result) ;
                integerResult = integerResult + 1 ;
                content.setText(integerResult+"");
                if(listener != null){
                    listener.onChange(integerResult);
                }
            }
        });
        content.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) {
            }
            @Override
            public void afterTextChanged(Editable s) {
                if(listener != null){
                    listener.onChange(Integer.parseInt(s.toString()));
                }
            }
        });
    }
    public ChangeListener listener ;

    public void setListener(ChangeListener listener){
        this.listener = listener;
    }
    interface ChangeListener{
        void onChange(int count);
    }
}
 
//JavaBean可以自己写
public class ShopBean {


    /**
     * code : 200
     * orderData : [{"shopId":1,"shopName":"京东自营","cartlist":[{"id":1,"shopId":1,"shopName":"京东自营","defaultPic":"https://img30.360buyimg.com/popWareDetail/jfs/t3208/194/7616404169/244198/369625db/58b7d093N03520fb7.jpg","productId":1,"productName":"三只松鼠_零食大礼包","color":null,"size":null,"price":20,"count":2},{"id":2,"shopId":1,"shopName":"京东自营","defaultPic":"https://img14.360buyimg.com/n0/jfs/t2971/15/167732091/93002/204c1016/574d9d9aNe4e6fa7a.jpg","productId":2,"productName":null,"color":null,"size":null,"price":148,"count":3}]},{"shopId":2,"shopName":"海澜之家","cartlist":[{"id":1,"shopId":2,"shopName":"海澜之家","defaultPic":"https://img30.360buyimg.com/popWaterMark/jfs/t4075/83/1343091204/132469/9034cb9c/5873496bN68020ba8.jpg","productId":1,"productName":"短袖T恤男 2017夏季新品","color":null,"size":null,"price":181,"count":1}]}]
     */

    private int code;
    private List<OrderDataBean> orderData;

    public int getCode() {
        return code;
    }

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

    public List<OrderDataBean> getOrderData() {
        return orderData;
    }

    public void setOrderData(List<OrderDataBean> orderData) {
        this.orderData = orderData;
    }

    public static class OrderDataBean {
        /**
         * shopId : 1
         * shopName : 京东自营
         * cartlist : [{"id":1,"shopId":1,"shopName":"京东自营","defaultPic":"https://img30.360buyimg.com/popWareDetail/jfs/t3208/194/7616404169/244198/369625db/58b7d093N03520fb7.jpg","productId":1,"productName":"三只松鼠_零食大礼包","color":null,"size":null,"price":20,"count":2},{"id":2,"shopId":1,"shopName":"京东自营","defaultPic":"https://img14.360buyimg.com/n0/jfs/t2971/15/167732091/93002/204c1016/574d9d9aNe4e6fa7a.jpg","productId":2,"productName":null,"color":null,"size":null,"price":148,"count":3}]
         */

        private int shopId;
        private String shopName;
        private List<CartlistBean> cartlist;

        public int getShopId() {
            return shopId;
        }

        public void setShopId(int shopId) {
            this.shopId = shopId;
        }

        public String getShopName() {
            return shopName;
        }

        public void setShopName(String shopName) {
            this.shopName = shopName;
        }

        public List<CartlistBean> getCartlist() {
            return cartlist;
        }

        public void setCartlist(List<CartlistBean> cartlist) {
            this.cartlist = cartlist;
        }

        public static class CartlistBean {
            /**
             * id : 1
             * shopId : 1
             * shopName : 京东自营
             * defaultPic : https://img30.360buyimg.com/popWareDetail/jfs/t3208/194/7616404169/244198/369625db/58b7d093N03520fb7.jpg
             * productId : 1
             * productName : 三只松鼠_零食大礼包
             * color : null
             * size : null
             * price : 20
             * count : 2
             */

            private int id;
            private int shopId;
            private String shopName;
            private String defaultPic;
            private int productId;
            private String productName;
            private Object color;
            private Object size;
            private int price;
            private int count;

            //商品是否被选中
            private boolean isSelect = false;
            //是否是第一个 如果isfirst 等于1 显示商户的名称， 否则隐藏商户的名称
            private int isFirst = 2;
            //商户是否被选中
            private boolean isShopSelect = false;

            public int getId() {
                return id;
            }

            public void setId(int id) {
                this.id = id;
            }

            public int getShopId() {
                return shopId;
            }

            public void setShopId(int shopId) {
                this.shopId = shopId;
            }

            public String getShopName() {
                return shopName;
            }

            public void setShopName(String shopName) {
                this.shopName = shopName;
            }

            public String getDefaultPic() {
                return defaultPic;
            }

            public void setDefaultPic(String defaultPic) {
                this.defaultPic = defaultPic;
            }

            public int getProductId() {
                return productId;
            }

            public void setProductId(int productId) {
                this.productId = productId;
            }

            public String getProductName() {
                return productName;
            }

            public void setProductName(String productName) {
                this.productName = productName;
            }

            public Object getColor() {
                return color;
            }

            public void setColor(Object color) {
                this.color = color;
            }

            public Object getSize() {
                return size;
            }

            public void setSize(Object size) {
                this.size = size;
            }

            public int getPrice() {
                return price;
            }

            public void setPrice(int price) {
                this.price = price;
            }

            public int getCount() {
                return count;
            }

            public void setCount(int count) {
                this.count = count;
            }


            public boolean isSelect() {
                return isSelect;
            }

            public void setSelect(boolean select) {
                isSelect = select;
            }

            public int getIsFirst() {
                return isFirst;
            }

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

            public boolean isShopSelect() {
                return isShopSelect;
            }

            public void setShopSelect(boolean shopSelect) {
                isShopSelect = shopSelect;
            }
        }
    }
}

//布局
//主类布局
<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:id="@+id/rv">

</android.support.v7.widget.RecyclerView>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/checkbox"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:text="全选"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tv"
            android:layout_centerInParent="true"
            android:layout_marginLeft="100dp"
            android:text="总价："
            android:textSize="22sp"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:id="@+id/bt"
            android:text="结算"
            />
    </RelativeLayout>
//自定义View布局
<Button
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:id="@+id/revserse"
    android:text="-"
    android:background="#00FFFFFF"/>
<EditText
    android:text="1"
    android:background="@null"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:gravity="center"
    android:id="@+id/content"/>

<Button
    android:background="#00FFFFFF"
    android:text="+"
    android:id="@+id/add"
    android:layout_width="30dp"
    android:layout_height="30dp"
    />
//适配器里面的条目

<CheckBox
    android:layout_gravity="center"
    android:id="@+id/checkbox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:orientation="vertical"
    android:layout_gravity="center">

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

        <ImageView
            android:id="@+id/shopface"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:background="@mipmap/ic_launcher" />
        <TextView
            android:id="@+id/price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="22sp"
            android:layout_gravity="center"/>
    </LinearLayout>
    <com.bwie.gouwuchedemo.MyView
        android:id="@+id/customviewid"
        android:layout_gravity="center"
        android:layout_width="100dp"
        android:layout_height="50dp"/>

</LinearLayout>

json串  shop.json
{  "code" : 200 ,
  "orderData" : [
    {


      "shopId": 1,
      "shopName":"京东自营",
      "cartlist": [
        {
          "id": 1,
          "shopId": 1,
          "shopName": "京东自营",
          "defaultPic": "https://img30.360buyimg.com/popWareDetail/jfs/t3208/194/7616404169/244198/369625db/58b7d093N03520fb7.jpg",
          "productId": 1,
          "productName": "三只松鼠_零食大礼包",
          "color": "黑色",
          "size": "18L",
          "price": 20,
          "count":1
        },
        {
          "id": 2,
          "shopId": 1,
          "shopName": "京东自营",
          "defaultPic": "https://img14.360buyimg.com/n0/jfs/t2971/15/167732091/93002/204c1016/574d9d9aNe4e6fa7a.jpg",
          "productId": 2,
          "productName": "小米心跳手环",
          "color": "白色",
          "size": "20XXL",
          "price": 148,
          "count": 1
        }
      ]
    }
  ,
    {
      "shopId": 2,
      "shopName":"海澜之家",
      "cartlist": [
        {
          "id": 1,
          "shopId": 2,
          "shopName": "海澜之家",
          "defaultPic": "https://img30.360buyimg.com/popWaterMark/jfs/t4075/83/1343091204/132469/9034cb9c/5873496bN68020ba8.jpg",
          "productId": 1,
          "productName": "短袖T恤男 2017夏季新品",
          "color": "蓝色",
          "size": "30X",
          "price": 181,
          "count":1
        }
      ]
    }
  ,
    {
      "shopId": 3,
      "shopName":"OPPO官方旗舰店",
      "cartlist": [
        {
          "id": 1,
          "shopId": 3,
          "shopName": "OPPO官方旗舰店",
          "defaultPic": "https://img10.360buyimg.com/cms/jfs/t6064/272/2163314583/157700/442d6477/593c1c49N7c63a7d9.jpg",
          "productId": 1,
          "productName": "OPPO R11 全网通",
          "color": "蓝色",
          "size": "30X",
          "price": 1999,
          "count":1
        },
        {
          "id": 2,
          "shopId": 3,
          "shopName": "OPPO官方旗舰店",
          "defaultPic": "https://img14.360buyimg.com/n0/jfs/t3142/194/4953241722/254855/1651c2b1/585b9021Nf653e48a.jpg",
          "productId": 1,
          "productName": "OPPO R9 全网通",
          "color": "蓝色",
          "size": "30X",
          "price": 999,
          "count":1
        }
      ]
    }


  ]
}

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