简单的购物车实现

购物车的接口

//购物车
    public static final String GOU_API="http://172.17.8.100/small/commodity/v1/findCommodityByKeyword?keyword=鞋&page=1&count=30";

购物车的bean包

public String message;
    public String status;
    public List<ResultBean> result;

    public static class ResultBean {
        public boolean checked=false;

        public boolean isChecked() {
            return checked;
        }

        public void setChecked(boolean checked) {
            this.checked = checked;
        }


        public int commodityId;
        public String commodityName;
        public String masterPic;
        public int price;
        public int saleNum;
    }

购物车的契约类

 //p层
    public abstract class LloadPresenter{
        public abstract void Goupresenter(HashMap<String,String> map);
    }
    //m层
    interface LloadModel{
        void GouModel(HashMap<String,String> map,RequestCallBack callBack);
    }
    //v层
    interface LloadView{
        //购物车
        void GouSuccess(String result);
        void GouFailure(String msg);
    }

OkHttpUtils工具类

package jiaoyibo.bawei.com.gouwuche.net;
import android.os.Handler;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;

public class OkHttpUtils {

    private static OkHttpUtils mInstance;
    private final OkHttpClient okHttpClient;
    private Handler handler = new Handler();
    public static OkHttpUtils getInstance() {
        if (mInstance==null){
            synchronized (OkHttpUtils.class){
                if (mInstance==null){
                    mInstance = new OkHttpUtils();
                }
            }
        }
        return mInstance;
    }

    private OkHttpUtils(){
        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        okHttpClient = new OkHttpClient.Builder()
                .addInterceptor(loggingInterceptor)
                .writeTimeout(5,TimeUnit.SECONDS)
                .connectTimeout(5,TimeUnit.SECONDS)
                .readTimeout(5,TimeUnit.SECONDS)
                .build();
    }
    public void doGet(String url, final OkHttpCallBack okHttpCallback){

        Request build = new Request.Builder().url(url).get().build();

        okHttpClient.newCall(build).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        okHttpCallback.Failure("网络异常");
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {

                if (response.code()==200){
                    final String string = response.body().string();
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            okHttpCallback.Success(string);
                        }
                    });
                }
            }
        });
    }
    public void dopost(String url, HashMap<String,String> params, final OkHttpCallBack callBack){
        FormBody.Builder builder = new FormBody.Builder();
        for (Map.Entry<String,String> map:params.entrySet()) {
            builder.add(map.getKey(),map.getValue());
        }
        RequestBody requestBody = builder.build();
        Request request = new Request.Builder().url(url).post(requestBody).build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                if (callBack!=null){
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            callBack.Failure("网络请求失败");
                        }
                    });
                }
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (callBack!=null){
                    if (response.code()==200){
                        final String result = response.body().string();
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                            callBack.Success(result);
                            }
                        });
                    }
                }
            }
        });

    }

}

OkHttpCallBack接口

	void Success(String result);
    void Failure(String msg);

RequestCallBack接口

	void Success(String result);
    void Failure(String msg);

购物车的Model层

package jiaoyibo.bawei.com.gouwuche.model;

import android.os.Handler;

import java.util.HashMap;

import jiaoyibo.bawei.com.gouwuche.api.UserApi;
import jiaoyibo.bawei.com.gouwuche.contract.LoadContract;
import jiaoyibo.bawei.com.gouwuche.net.OkHttpCallBack;
import jiaoyibo.bawei.com.gouwuche.net.OkHttpUtils;
import jiaoyibo.bawei.com.gouwuche.net.RequestCallBack;

/**
 * <p>文件描述：<p>
 * <p>作者：JYB<p>
 * <p>创建时间：2019/3/5<p>
 * <p>更改时间：2019/3/5<p>
 * <p>版本号：1<p>
 */
public class LoadModel implements LoadContract.LloadModel{
    private Handler handler = new Handler();
    @Override
    public void GouModel(HashMap<String, String> map, final RequestCallBack callBack) {
        OkHttpUtils.getInstance().doGet(UserApi.GOU_API, new OkHttpCallBack() {
            @Override
            public void Success(final String result) {
                if (callBack!=null){
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            callBack.Success(result);
                        }
                    });
                }
            }

            @Override
            public void Failure(final String msg) {
                if (callBack!=null){
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            callBack.Failure(msg);
                        }
                    });
                }
            }
        });
    }
}

购物车的presenter层

package jiaoyibo.bawei.com.gouwuche.presenter;

import java.util.HashMap;

import jiaoyibo.bawei.com.gouwuche.contract.LoadContract;
import jiaoyibo.bawei.com.gouwuche.model.LoadModel;
import jiaoyibo.bawei.com.gouwuche.net.RequestCallBack;

/**
 * <p>文件描述：<p>
 * <p>作者：JYB<p>
 * <p>创建时间：2019/3/5<p>
 * <p>更改时间：2019/3/5<p>
 * <p>版本号：1<p>
 */
public class LoadPresenter extends LoadContract.LloadPresenter{
    private LoadContract.LloadView lloadView;
    private final LoadModel loadModl;

    public LoadPresenter(LoadContract.LloadView lloadView) {
        this.lloadView = lloadView;
        loadModl = new LoadModel();
    }
    @Override
    public void Goupresenter(HashMap<String, String> map) {
        loadModl.GouModel(map, new RequestCallBack() {
            @Override
            public void Success(String result) {
                if (lloadView!=null){
                    lloadView.GouSuccess(result);
                }
            }

            @Override
            public void Failure(String msg) {
                if (lloadView!=null){
                    lloadView.GouFailure(msg);
                }
            }
        });
    }
}

购物车自定义View控件

package jiaoyibo.bawei.com.gouwuche.view;

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

import jiaoyibo.bawei.com.gouwuche.R;

/**
 * <p>文件描述：<p>
 * <p>作者：JYB<p>
 * <p>创建时间：2019/3/5<p>
 * <p>更改时间：2019/3/5<p>
 * <p>版本号：1<p>
 */
public class GouView extends LinearLayout {
    private TextView jia,jian;
    private EditText num;
    private int num1=1;
    public GouView(Context context) {
        super(context);
    }

    public GouView(Context context, AttributeSet attrs) {
        super(context, attrs);
        View view=LayoutInflater.from(context).inflate(R.layout.linear4,this);
        num=view.findViewById(R.id.et_num);
        jian=view.findViewById(R.id.minus);
        jia=view.findViewById(R.id.add);
        num.setText("1");
        jia.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                num1++;
                num.setText(num1+"");
            }
        });

        jian.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                num1--;
                if (num1==0){
                    num1=1;
                    Toast.makeText(getContext(),"不能减了",Toast.LENGTH_SHORT).show();
                    return;
                }else {
                    num.setText(num1+"");
                }
            }
        });

    }

    public GouView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
}

购物车的适配器

package jiaoyibo.bawei.com.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.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.ArrayList;
import java.util.List;

import jiaoyibo.bawei.com.gouwuche.R;
import jiaoyibo.bawei.com.gouwuche.bean.GouBean;

/**
 * <p>文件描述：<p>
 * <p>作者：JYB<p>
 * <p>创建时间：2019/3/5<p>
 * <p>更改时间：2019/3/5<p>
 * <p>版本号：1<p>
 */
public class GouAdapter extends RecyclerView.Adapter<GouAdapter.ViewHolder> {
    private List<GouBean.ResultBean> list;
    private Context context;

    public GouAdapter(Context context) {
        this.context = context;
        list=new ArrayList<>();
    }

    public void setList(List<GouBean.ResultBean> list) {
        if (list!=null){
            this.list = list;
        }
        notifyDataSetChanged();
    }
    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view=LayoutInflater.from(context).inflate(R.layout.linear3,viewGroup,false);
        ViewHolder viewHolder = new ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
        GouBean.ResultBean resultBean = list.get(i);
        viewHolder.name.setText(list.get(i).commodityName);
        viewHolder.price.setText(list.get(i).price+""+"¥");
        viewHolder.checkbox.setChecked(resultBean.isChecked());
        String[] images = resultBean.masterPic.split("\\|");
        Glide.with(context).load(images[0]).into(viewHolder.image);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView name;
        private TextView price;
        private ImageView image;
        private CheckBox checkbox;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            name=itemView.findViewById(R.id.name);
            price=itemView.findViewById(R.id.price);
            image=itemView.findViewById(R.id.image);
            checkbox=itemView.findViewById(R.id.checkbox);
        }
    }
}

购物车页面操作

package jiaoyibo.bawei.com.gouwuche;

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

import com.google.gson.Gson;

import java.util.HashMap;

import jiaoyibo.bawei.com.gouwuche.adapter.GouAdapter;
import jiaoyibo.bawei.com.gouwuche.bean.GouBean;
import jiaoyibo.bawei.com.gouwuche.contract.LoadContract;
import jiaoyibo.bawei.com.gouwuche.presenter.LoadPresenter;

public class MainActivity extends AppCompatActivity implements LoadContract.LloadView {
    private RecyclerView xrec3;
    private LoadPresenter loadPresenter;
    private GouAdapter gouAdapter;
    private CheckBox checkbox1;
    private TextView num;
    private Button but;
    private GouBean gouBean;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        checkbox1 =findViewById(R.id.checkbox1);


        but = findViewById(R.id.but);
        xrec3 = findViewById(R.id.xrec3);
        loadPresenter = new LoadPresenter(this);
        xrec3.setLayoutManager(new LinearLayoutManager(this));
        loadPresenter.Goupresenter(new HashMap<String, String>());
        checkbox1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                for (GouBean.ResultBean resultBean:gouBean.result){
                    resultBean.setChecked(checkbox1.isChecked());
                }
                gouAdapter.notifyDataSetChanged();
                getTouchprice();
            }

            private void getTouchprice() {
                double touchprice=0;
                for (GouBean.ResultBean resultBean:gouBean.result) {
                    if(resultBean.isChecked()){
                        touchprice+=resultBean.price;
                    }
                }
                checkbox1.setText("¥"+touchprice);
            }
        });
    }

    @Override
    public void GouSuccess(String result) {
        gouBean = new Gson().fromJson(result, GouBean.class);
        gouAdapter = new GouAdapter(this);
        xrec3.setAdapter(gouAdapter);
        gouAdapter.setList(gouBean.result);
    }

    @Override
    public void GouFailure(String msg) {

    }
}

自定义View的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <TextView
            android:id="@+id/minus"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="-"/>

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="1"
            android:id="@+id/et_num"
            />
        <TextView
            android:id="@+id/add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"

            android:text="+"/>

    </LinearLayout>
</LinearLayout>

购物车适配器的布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:cardCornerRadius="10dp"
    android:layout_margin="10dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:padding="10dp"
            >
            <CheckBox
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/checkbox"
                android:layout_gravity="center"
                />
            <ImageView
                android:id="@+id/image"
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:src="@mipmap/ic_launcher"
                />
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                >
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/name"
                    android:text="二十多人头发一股合同工一顿饭水电费的"
                    android:maxLines="2"
                    android:textSize="20dp"
                    android:layout_marginLeft="5dp"
                    />
                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    >
                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="5dp"
                        android:id="@+id/price"
                        android:textSize="20dp"
                        android:text="99999"
                        android:textColor="#ff00"
                        android:layout_marginTop="10dp"
                        />
                    <jiaoyibo.bawei.com.gouwuche.view.GouView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"></jiaoyibo.bawei.com.gouwuche.view.GouView>
                </LinearLayout>

            </LinearLayout>

        </LinearLayout>

    </LinearLayout>

</android.support.v7.widget.CardView>

购物车页面的布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="#00FFFF"
    android:layout_margin="10dp"
    app:cardCornerRadius="10dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
        <android.support.v7.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="9"
            android:id="@+id/xrec3"
            ></android.support.v7.widget.RecyclerView>
        <LinearLayout
            android:background="#FFFAFA"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:orientation="horizontal"
            >
            <CheckBox
                android:id="@+id/checkbox1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="全选/反选"
                android:layout_gravity="center"
                android:textSize="20dp"
                />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/but"
                android:text="去结算"
                android:background="#FF0000"
                android:textColor="#FFFFFF"
                android:gravity="center"
                android:layout_marginLeft="320dp"
                android:layout_gravity="center"
                />
        </LinearLayout>
    </LinearLayout>
</android.support.v7.widget.CardView>