购物车

//main布局

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

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <CheckBox
            android:id="@+id/main_cb"
            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"
            android:layout_marginLeft="50dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="总价："/>
    </LinearLayout>


    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>

</LinearLayout>

<?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">

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

<ImageView
    android:id="@+id/item_iv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@mipmap/ic_launcher"/>
<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <TextView
        android:id="@+id/item_tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="aa"/>
    <TextView
        android:id="@+id/item_tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="bb"/>
</LinearLayout>

</LinearLayout>

//mainActivity

package com.example.shopping;

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.CheckBox;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;

import java.util.ArrayList;

import adapert.com.exam.MyAadapert;
import bean.com.exam.MessageEvent;
import bean.com.exam.MessageMoneyConut;
import bean.com.exam.StringBean;

public class MainActivity extends AppCompatActivity {

    private RecyclerView rv;
    private CheckBox main_cb;
    private MyAadapert myAadapert;
    private int count;
    private float sum;
    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EventBus.getDefault().register(this);


        rv = (RecyclerView) findViewById(R.id.rv);
        main_cb = (CheckBox) findViewById(R.id.main_cb);
        tv = (TextView) findViewById(R.id.tv);
        rv.setLayoutManager(new LinearLayoutManager(this));


        ArrayList<StringBean> list = new ArrayList<>();
        for (int i=1; i<8; i++){
           StringBean bean = new StringBean("你好"+i,"商品为:"+i+"元",false);
            list.add(bean);
        }
        myAadapert = new MyAadapert(list, this);
        rv.setAdapter(myAadapert);
        main_cb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myAadapert.cbChecked(main_cb.isChecked());
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this);
    }


    @Subscribe
    public void onMessageEvent(MessageEvent event) {
        main_cb.setChecked(event.isChecked());
    };

   /* @Subscribe
    public void onMagConutEvent(MessageMoneyConut msg) {

        float money = msg.getMoney();
        int num = msg.getNum();
        sum+=money;
        count+=num;
        tv.setText("数量:"+count+"总价:"+sum+"元");
    };*/
}

//适配器

package adapert.com.exam;

import android.content.Context;
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.example.shopping.R;

import org.greenrobot.eventbus.EventBus;

import java.util.ArrayList;
import java.util.Map;

import bean.com.exam.MessageEvent;
import bean.com.exam.MessageMoneyConut;
import bean.com.exam.StringBean;

/**
 * Created by Helloworld on 2017/10/23.
 */

public class MyAadapert extends RecyclerView.Adapter {

    private ArrayList<StringBean> list;
    private Context context;
    private OnclickItemListenr onclickItemListenr;

    public MyAadapert(ArrayList<StringBean> list, Context context) {
        this.list = list;
        this.context = context;
    }

    public void setOnclickItemListenr(OnclickItemListenr onclickItemListenr){
        this.onclickItemListenr=onclickItemListenr;
    }

    public interface OnclickItemListenr{
        public void onItemClick();
    }

    private  boolean isAll(){
        for (StringBean stringBean : list){
            if (!stringBean.ischeck()){
                return false;
            }
        }
        return true;
    }
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
        return new MyHolder(view);
    }

    public void cbChecked(boolean flag){
        for (StringBean stringBean : list){
            stringBean.setIscheck(flag);
            notifyDataSetChanged();
        }
    }


    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
        final MyHolder myHolder = (MyHolder) holder;
        myHolder.iten_tv1.setText(list.get(position).getName());
        myHolder.iten_tv2.setText(list.get(position).getPrince());
        myHolder.item_cb.setChecked(list.get(position).ischeck());

        myHolder.item_cb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (myHolder.item_cb.isChecked()){
                    list.get(position).setIscheck(true);


                    /*MessageMoneyConut moneyConut = new MessageMoneyConut();
                    moneyConut.setNum(1);
                    moneyConut.setMoney(Integer.parseInt(list.get(position).getPrince()));
                    EventBus.getDefault().post(moneyConut);*/


                    if(isAll()){
                        MessageEvent messageEvent = new MessageEvent();
                        messageEvent.setChecked(true);
                        EventBus.getDefault().post(messageEvent);
                    }


                }else {
                    list.get(position).setIscheck(false);
                    MessageEvent messageEvent = new MessageEvent();
                    messageEvent.setChecked(false);
                    EventBus.getDefault().post(messageEvent);
                }
            }
        });
    }

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

    public class MyHolder extends RecyclerView.ViewHolder{

        private final ImageView item_iv;
        private final TextView iten_tv1;
        private final TextView iten_tv2;
        private final CheckBox item_cb;

        public MyHolder(View itemView) {
            super(itemView);
            item_cb = itemView.findViewById(R.id.item_cb);
            item_iv = itemView.findViewById(R.id.item_iv);
            iten_tv1 = itemView.findViewById(R.id.item_tv1);
            iten_tv2 = itemView.findViewById(R.id.item_tv2);
        }
    }


}

//封装bean

package bean.com.exam;

/**
 * Created by Helloworld on 2017/10/23.
 */

public class StringBean {
    private String name;
    private String prince;
    private boolean ischeck;

    public StringBean(String name, String prince, boolean ischeck) {
        this.name = name;
        this.prince = prince;
        this.ischeck = ischeck;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPrince() {
        return prince;
    }

    public void setPrince(String prince) {
        this.prince = prince;
    }

    public boolean ischeck() {
        return ischeck;
    }

    public void setIscheck(boolean ischeck) {
        this.ischeck = ischeck;
    }
}

//封装EvenyBus

package bean.com.exam;

/**
 * Created by Helloworld on 2017/10/24.
 */

public class MessageMoneyConut {

    private int num;
    private int money;

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }

    public int getMoney() {
        return money;
    }

    public void setMoney(int money) {
        this.money = money;
    }
}

//封装EvenyBus

package bean.com.exam;

/**
 * Created by Helloworld on 2017/10/23.
 */

public class MessageEvent {
    private boolean checked;

    public boolean isChecked() {
        return checked;
    }

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