京东购物车左分类右显示

先看下效果 （代码里有三个接口回调，左边适配器有一个，是为了把下标传到Mainactivity的页面里获得右边的数据，因为用的一个接口，第二个适配器在右边的适配器里，是为了刷新自定义view里的加减和刷新Mainactivity里的总价格跟着动，第三个适配器在自定义view里是为了回传从数据里拿到的count,大家认真点看就完了）

 先看主布局左边一个recycler右边一个recycler

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
     ns:app=\"http://schemas.android.com/apk/res-auto\"
     ns:tools=\"http://schemas.android.com/tools\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\"
    android:orientation=\"vertical\"
    tools:context=\".MainActivity\">

    <LinearLayout
        android:layout_weight=\"1\"
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\">
        <android.support.v7.widget.RecyclerView
            android:id=\"@+id/left\"
            android:layout_width=\"0dp\"
            android:layout_weight=\"1\"
            android:layout_height=\"match_parent\"/>
        <android.support.v7.widget.RecyclerView
            android:id=\"@+id/right\"
            android:layout_width=\"0dp\"
            android:layout_weight=\"3\"
            android:layout_height=\"match_parent\"/>

    </LinearLayout>

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

        <TextView
            android:id=\"@+id/jiage\"
            android:layout_weight=\"1\"
            android:gravity=\"center\"
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:text=\"价格\"/>
        <TextView
            android:id=\"@+id/jiesuan\"
            android:layout_weight=\"1\"
            android:gravity=\"center\"
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:text=\"去结算（0）\"/>

    </LinearLayout>



</LinearLayout>

 Mainactivity

package com.example.bwie.gouwuche;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.telecom.Call;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import com.example.bwie.gouwuche.adapter.LeftAdapter;
import com.example.bwie.gouwuche.adapter.RightAdapter;
import com.example.bwie.gouwuche.bean.MyBean;
import com.google.gson.Gson;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

    private RecyclerView left;
    private RecyclerView right;
    private TextView jiage;
    private TextView jiesuan;
    private List<MyBean.DataBean> list=new ArrayList<>();
    private List<MyBean.DataBean.SpusBean> list1=new ArrayList<>();
    private LeftAdapter adapter;
    private String mUrl=\"http://www.wanandroid.com/tools/mockapi/6523/restaurant-list\";
    @SuppressLint(\"HandlerLeak\")
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            String s= (String) msg.obj;
            Gson gson=new Gson();
            MyBean myBean = gson.fromJson(s, MyBean.class);
            list.addAll(myBean.getData());
            adapter.notifyDataSetChanged();
        }
    };
    private RightAdapter adapter1;
    private List<MyBean.DataBean.SpusBean> spus;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        adapter = new LeftAdapter(list,MainActivity.this);
        adapter1 = new RightAdapter(list1,MainActivity.this);
        right.setAdapter(adapter1);
        left.setAdapter(adapter);
        getData();
        adapter.setLeftShuju(new LeftAdapter.setLeft() {
            @Override
            public void LeftChecked(View v, int position) {
                list1.clear();
                spus = list.get(position).getSpus();
                for (int i = 0; i < spus.size(); i++) {
                    spus.get(i).setPraise_num(0);
                }
                list1.addAll(spus);
                adapter1.notifyDataSetChanged();
            }
        });
        adapter1.setCallBack(new RightAdapter.AdapterCallBack() {
            @Override
            public void shuaxin() {
                float price=0;
                int number=0;
                for (int i = 0; i < spus.size(); i++) {
                    price+=spus.get(i).getPraise_num()*Float.valueOf(spus.get(i).getSkus().get(0).getPrice());
                }
                for (int j = 0; j < spus.size(); j++) {
                    number+=spus.get(j).getPraise_num();
                }
                jiage.setText(price+\"\");
                jiesuan.setText(number+\"\");
            }
        });
    }
    private void initView() {
        left = (RecyclerView) findViewById(R.id.left);
        right = (RecyclerView) findViewById(R.id.right);
        jiage = (TextView) findViewById(R.id.jiage);
        jiesuan = (TextView) findViewById(R.id.jiesuan);
        left.setLayoutManager(new LinearLayoutManager(this));
        right.setLayoutManager(new LinearLayoutManager(MainActivity.this));
    }
    private void getData() {
        OkHttpClient okHttpClient=new OkHttpClient();
        Request request=new Request.Builder().url(mUrl).build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(okhttp3.Call call, IOException e) {

            }
            @Override
            public void onResponse(okhttp3.Call call, Response response) throws IOException {
                handler.sendMessage(handler.obtainMessage(0,response.body().string()));
            }
        });
    }
}

 左边的适配器

package com.example.bwie.gouwuche.adapter;

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.TextView;

import com.example.bwie.gouwuche.R;
import com.example.bwie.gouwuche.bean.MyBean;

import java.util.List;

public class LeftAdapter extends RecyclerView.Adapter<LeftAdapter.ViewHolder> {
    private List<MyBean.DataBean> list;
    private Context context;

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

    @NonNull
    @Override
    public LeftAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View v=LayoutInflater.from(context).inflate(R.layout.left,null);
        ViewHolder viewHolder=new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull LeftAdapter.ViewHolder viewHolder, final int i) {
        viewHolder.name.setText(list.get(i).getName());
        viewHolder.name.set Listener(new View. Listener() {
            @Override
            public void  (View v) {
                if (shuju!=null){
                    shuju.LeftChecked(v,i);
                }
            }
        });
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView name;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            name=itemView.findViewById(R.id.name);
        }
    }
    public interface setLeft{
        void LeftChecked(View v,int position);
    }
    private setLeft shuju;
    public void setLeftShuju(setLeft shuju){
        this.shuju=shuju;
    }
}

右边的适配器

package com.example.bwie.gouwuche.adapter;

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.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.bwie.gouwuche.R;
import com.example.bwie.gouwuche.bean.MyBean;
import com.example.bwie.gouwuche.weight.JiajianView;

import java.util.List;

public class RightAdapter extends RecyclerView.Adapter<RightAdapter.ViewHolder> {
    List<MyBean.DataBean.SpusBean> list;
    private Context context;

    public RightAdapter(List<MyBean.DataBean.SpusBean> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @NonNull
    @Override
    public RightAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(context).inflate(R.layout.right, null);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, final int i) {
        viewHolder.right_ .setText(list.get(i).getName());
        viewHolder.right_price.setText(list.get(i).getSkus().get(0).getPrice());
        Glide.with(context).load(list.get(i).getPic_url()).into(viewHolder.right_icon);
        viewHolder.jiajianView.setNum(list.get(i).getPraise_num());
        viewHolder.jiajianView.setRightshuju(new JiajianView.setRight() {
            @Override
            public void Rightshuju(int count) {
                list.get(i).setPraise_num(count);
                notifyDataSetChanged();
                adapterCallBack.shuaxin();
            }
        });

    }
    @Override
    public int getItemCount() {
        return list.size();
    }
    public interface AdapterCallBack{
        void shuaxin();
    }
    AdapterCallBack adapterCallBack;
    public void setCallBack(AdapterCallBack adapterCallBack){
       this.adapterCallBack=adapterCallBack;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView right_ ;
        TextView right_price;
        ImageView right_icon;
        JiajianView jiajianView;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            right_  = itemView.findViewById(R.id.right_ );
            right_price = itemView.findViewById(R.id.right_price);
            right_icon = itemView.findViewById(R.id.right_icon);
            jiajianView=itemView.findViewById(R.id.Jia_Jian_View);
        }
    }
}

左布局

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
    android:orientation=\"vertical\" android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\">

    <TextView
        android:id=\"@+id/name\"
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\" />

</LinearLayout>

右布局（里边有一个自定义view）

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"120dp\"
    android:gravity=\"center_vertical\"
    android:orientation=\"horizontal\">

    <ImageView
        android:id=\"@+id/right_icon\"
        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/right_ \"
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:maxLines=\"2\"
            android:text=\"商品标题\" />

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

    </LinearLayout>

    <com.example.bwie.gouwuche.weight.JiajianView
        android:id=\"@+id/Jia_Jian_View\"
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\"></com.example.bwie.gouwuche.weight.JiajianView>
</LinearLayout>

自定义view类

package com.example.bwie.gouwuche.weight;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.bwie.gouwuche.R;

public class JiajianView extends LinearLayout implements View. Listener {
    private TextView delete_tv;
    private TextView product_number_tv;
    private TextView add_tv;
    private int count=0;

    public JiajianView(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.add_remove_view_layout, this);
        initView();
    }

    private void initView() {
        delete_tv=findViewById(R.id.delete_tv);
        product_number_tv=findViewById(R.id.product_number_tv);
        add_tv=findViewById(R.id.add_tv);
        delete_tv.set Listener(this);
        add_tv.set Listener(this);
    }
    public void  setNum(int number){
        this.count=number;
        if(count==0){
            delete_tv.setVisibility(GONE);
        }else{
            delete_tv.setVisibility(VISIBLE);
        }
        product_number_tv.setText(count+\"\");
    }

    @Override
    public void  (View v) {
        switch (v.getId()){
            case R.id.delete_tv:
                count--;
                if (count<0){
                    Toast.makeText(getContext(), \"商品已售空！！\", Toast.LENGTH_SHORT).show();
                    return;
                }
                product_number_tv.setText(count+\"\");
                if (setright!=null){
                    setright.Rightshuju(count);
                }
                break;
            case R.id.add_tv:
                count++;
                product_number_tv.setText(count+\"\");
                if (setright!=null){
                    setright.Rightshuju(count);
                }
                break;
        }
    }
    public interface setRight{
        void Rightshuju(int count);
    }
    private setRight setright;
    public void setRightshuju(setRight setright){
        this.setright=setright;
    }

}

自定义view的布局

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
    android:layout_width=\"wrap_content\"
    android:layout_height=\"30dp\"
    android:layout_gravity=\"center_vertical\"
    android:layout_marginLeft=\"10dp\"
    android:background=\"#99000000\"
    android:gravity=\"center_vertical\"
    android:padding=\"2dp\">

    <TextView
        android:id=\"@+id/delete_tv\"
        android:layout_width=\"25dp\"
        android:layout_height=\"match_parent\"
        android:background=\"#ffffff\"
        android:gravity=\"center\"
        android:text=\"-\"
        android:textSize=\"16sp\" />

    <TextView
        android:id=\"@+id/product_number_tv\"
        android:layout_width=\"25dp\"
        android:layout_height=\"match_parent\"
        android:layout_marginLeft=\"2dp\"
        android:layout_weight=\"1\"
        android:background=\"#ffffff\"
        android:gravity=\"center\"
         />

    <TextView
        android:id=\"@+id/add_tv\"
        android:layout_width=\"25dp\"
        android:layout_height=\"match_parent\"
        android:layout_marginLeft=\"2dp\"
        android:background=\"#ffffff\"
        android:gravity=\"center\"
        android:text=\"+\"
        android:textSize=\"16sp\" />

</LinearLayout>

完结