Android实现二级列表购物车功能

本文实例为大家分享了Android实现二级列表购物车功能的具体代码，供大家参考，具体内容如下

MainActivity：

package com.baway.twoshopcar;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.CheckBox;
import android.widget.ExpandableListView;
import android.widget.TextView;

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

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

/**
  * 全选
  */
 private CheckBox mCbAll;
 /**
  * 22
  */
 private TextView mTotalPrice;
 /**
  * 22
  */
 private TextView mTotalNum;
 private ExpandableListView mElv;

private List<GroupBean> groupList = new ArrayList<>();
 private List<List<ChildBean>> childList = new ArrayList<>();
 private MyAdapter adapter;

@Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   EventBus.getDefault().register(this);
   initView();
   initDate();
   mElv.setGroupIndicator(null);
   adapter = new MyAdapter(this, groupList, childList);
   mElv.setAdapter(adapter);
   for (int i = 0; i <groupList.size() ; i++) {
     mElv.expandGroup(i);
   }

}

@Subscribe
 public void moneyCount(MCEvent mcEvent){
   int money = mcEvent.getMoney();
   int count = mcEvent.getCount();
   mTotalNum.setText(count+"");
   mTotalPrice.setText(money+"");
 }
 @Subscribe
 public void messageEvent(MsgEvent msg) {
   mCbAll.setChecked(msg.isFlag());
 }
 @Override
 protected void onDestroy() {
   super.onDestroy();
   EventBus.getDefault().unregister(this);
 }

private void initDate() {
   for (int i = 0; i < 3; i++) {
     GroupBean groupBean = new GroupBean(false, "商家" + i);
     groupList.add(groupBean);
     List<ChildBean> list = new ArrayList<>();
     for (int j = 0; j < 2; j++) {
       ChildBean childBean = new ChildBean("商品" + i, 1 + i, false);
       list.add(childBean);
     }
     childList.add(list);
   }
 }

private void initView() {
   mCbAll = (CheckBox) findViewById(R.id.cb_all);
   mCbAll.setOnClickListener(this);
   mTotalPrice = (TextView) findViewById(R.id.totalPrice);
   mTotalNum = (TextView) findViewById(R.id.totalNum);
   mElv = (ExpandableListView) findViewById(R.id.elv);
 }

@Override
 public void onClick(View v) {
   switch (v.getId()) {
     case R.id.cb_all:
       adapter.allChecked(mCbAll.isChecked());
       break;
   }
 }
}

MyAdapter适配器：

package com.baway.twoshopcar;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;

import java.util.List;

/**
* Created by 郑文杰 on 2017/10/24.
*/

public class MyAdapter extends BaseExpandableListAdapter {

private Context context;
 private List<GroupBean> groupList;
 private List<List<ChildBean>> childList;
 private int count;
 private int sumMoney;

public MyAdapter(Context context, List<GroupBean> groupList, List<List<ChildBean>> childList) {
   this.context = context;
   this.groupList = groupList;
   this.childList = childList;
 }

@Override
 public int getGroupCount() {
   return groupList.size();
 }

@Override
 public int getChildrenCount(int groupPosition) {
   return childList.get(groupPosition).size();
 }

@Override
 public Object getGroup(int groupPosition) {
   return groupList.get(groupPosition);
 }

@Override
 public Object getChild(int groupPosition, int childPosition) {
   return childList.get(groupPosition).get(childPosition);
 }

@Override
 public long getGroupId(int groupPosition) {
   return groupPosition;
 }

@Override
 public long getChildId(int groupPosition, int childPosition) {
   return childPosition;
 }

@Override
 public boolean hasStableIds() {
   return false;
 }

@Override
 public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
   GroupViewHolder holder;
   if (convertView == null) {
     holder = new GroupViewHolder();
     convertView = View.inflate(context, R.layout.groupitem, null);
     holder.cb = convertView.findViewById(R.id.cb);
     holder.tvName = convertView.findViewById(R.id.tvName);
     convertView.setTag(holder);
   } else {

holder = (GroupViewHolder) convertView.getTag();
   }
   //赋值
   GroupBean groupBean = groupList.get(groupPosition);
   holder.cb.setChecked(groupBean.isChecked());
   holder.tvName.setText(groupBean.getGroupName());
   //给group设置点击事件
   holder.cb.setOnClickListener(new GroupCbOnClickListener(groupPosition));

return convertView;
 }

@Override
 public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
   ChildViewHolder holder;
   if (convertView == null) {
     holder = new ChildViewHolder();
     convertView = View.inflate(context, R.layout.childitem, null);
     holder.cb = convertView.findViewById(R.id.cb);
     holder.tvName = convertView.findViewById(R.id.tvName);
     holder.tvPrice = convertView.findViewById(R.id.tvPrice);
     convertView.setTag(holder);
   } else {
     holder = (ChildViewHolder) convertView.getTag();
   }
   //赋值
   ChildBean childBean = childList.get(groupPosition).get(childPosition);
   holder.cb.setChecked(childBean.isChecked());
   holder.tvName.setText(childBean.getChildName());
   holder.tvPrice.setText(childBean.getPrice() + "");
   //设置点击事件Child
   holder.cb.setOnClickListener(new ChildCbOnClickListener(groupPosition,childPosition));
   return convertView;
 }

@Override
 public boolean isChildSelectable(int groupPosition, int childPosition) {
   return true;
 }

class GroupViewHolder {
   CheckBox cb;
   TextView tvName;
 }

class ChildViewHolder {
   CheckBox cb;
   TextView tvName;
   TextView tvPrice;
 }

class ChildCbOnClickListener implements View.OnClickListener {

private int groupPosition;
   private int childPosition;

public ChildCbOnClickListener(int groupPosition, int childPosition) {
     this.groupPosition = groupPosition;
     this.childPosition = childPosition;
   }

@Override
   public void onClick(View v) {
     if (v instanceof CheckBox) {
       CheckBox cb = (CheckBox) v;
       List<ChildBean> childBeen = childList.get(groupPosition);
       ChildBean childBean = childBeen.get(childPosition);
       childBean.setChecked(cb.isChecked());
       //计算选中的商品数，并发送到主界面进行显示
       MCEvent mcEvent = new MCEvent();
       mcEvent.setCount(totalCount());
       mcEvent.setMoney(totalPrice());
       EventBus.getDefault().post(mcEvent);
       //判断商家所有的商品的checkbox是否选中
       if (isChildChecked(childBeen)) {
         groupList.get(groupPosition).setChecked(true);
         MsgEvent msgEvent = new MsgEvent();
         msgEvent.setFlag(isGroupChecked());
         EventBus.getDefault().post(msgEvent);
         notifyDataSetChanged();

} else {
         groupList.get(groupPosition).setChecked(false);
         MsgEvent msgEvent = new MsgEvent();
         msgEvent.setFlag(false);
         msgEvent.setFlag(isGroupChecked());
         EventBus.getDefault().post(msgEvent);
         notifyDataSetChanged();
       }
     }
   }

}
 /**
  * 判断所有商家的所有商品的checkbox是否都选中
  *
  * @param childBean
  * @return
  */
 private boolean isChildChecked(List<ChildBean> childBean) {

for (int i = 0; i < childBean.size(); i++) {
     ChildBean childBean1 = childBean.get(i);
     if (!childBean1.isChecked()) {
       return false;
     }
   }
   return true;
 }

class GroupCbOnClickListener implements View.OnClickListener {

private int groupPosition;

public GroupCbOnClickListener(int groupPosition) {
     this.groupPosition = groupPosition;
   }

@Override
   public void onClick(View v) {
     if (v instanceof CheckBox){
       CheckBox cb= (CheckBox) v;
       //根据cb.isChecked()是否选中，给一级列的checkbox改变状态
       groupList.get(groupPosition).setChecked(cb.isChecked());
       List<ChildBean> childBeenList = childList.get(groupPosition);
       for (ChildBean childBean : childBeenList){
         childBean.setChecked(cb.isChecked());
       }
       //计算选中的商品数和金额，并发送到主界面进行显示
       MCEvent mcEvent = new MCEvent();
       mcEvent.setCount(totalCount());
       mcEvent.setMoney(totalPrice());
       EventBus.getDefault().post(mcEvent);

MsgEvent msgEvent = new MsgEvent();
       msgEvent.setFlag(isGroupChecked());
       EventBus.getDefault().post(msgEvent);
       notifyDataSetChanged();
     }
   }
 }

/**
  * 判断其他商家是否选中
  * @return
  */
 private boolean isGroupChecked() {
   for (GroupBean groupBean : groupList) {
     if (!groupBean.isChecked()){
       return false;
     }
   }
   return true;
 }

//主界面全选框选中状态
 public void allChecked(boolean bool) {
   for (int i = 0; i < groupList.size(); i++) {
     groupList.get(i).setChecked(bool);
     for (int j = 0; j < childList.get(i).size(); j++) {
       childList.get(i).get(j).setChecked(bool);
     }
   }
   //计算选中的商品数，发送到主界面进行显示
   MCEvent mcEvent = new MCEvent();
   mcEvent.setCount(totalCount());
   mcEvent.setMoney(totalPrice());
   EventBus.getDefault().post(mcEvent);
   notifyDataSetChanged();

}

/**
  * 计算商品总价格
  *
  * @return
  */
 private int totalPrice() {
   sumMoney = 0;
   for (int i = 0; i < groupList.size(); i++) {
     for (int j = 0; j < childList.get(i).size(); j++) {
       if (childList.get(i).get(j).isChecked()) {
         int price = childList.get(i).get(j).getPrice();
         sumMoney += price;
       }
     }
   }
   return sumMoney;
 }

/**
  * 计算商品的总数量
  *
  * @return
  */
 private int totalCount() {
   count = 0;
   for (int i = 0; i < groupList.size(); i++) {
     for (int j = 0; j < childList.get(i).size(); j++) {
       if (childList.get(i).get(j).isChecked()) {
         //遍历所有商品，只要是选中状态的，就加1
         count++;
       }
     }
   }
   return count;
 }

}

childBean：

package com.baway.twoshopcar;

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

public class ChildBean {
 private String childName;
 private int price;
 private boolean checked;

public ChildBean(String childName, int price, boolean checked) {
   this.childName = childName;
   this.price = price;
   this.checked = checked;
 }

public String getChildName() {
   return childName;
 }

public void setChildName(String childName) {
   this.childName = childName;
 }

public int getPrice() {
   return price;
 }

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

public boolean isChecked() {
   return checked;
 }

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

groupBean：

package com.baway.twoshopcar;

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

public class GroupBean {

private boolean checked;
 private String groupName;

public GroupBean(boolean checked, String groupName) {
   this.checked = checked;
   this.groupName = groupName;
 }

public boolean isChecked() {
   return checked;
 }

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

public String getGroupName() {
   return groupName;
 }

public void setGroupName(String groupName) {
   this.groupName = groupName;
 }
}

MCEVENT：

package com.baway.twoshopcar;

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

public class MCEvent {
 private int money;
 private int count;

public int getMoney() {
   return money;
 }

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

public int getCount() {
   return count;
 }

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

msgEvent：

package com.baway.twoshopcar;

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

public class MsgEvent {
 private boolean flag;

public boolean isFlag() {
   return flag;
 }

public void setFlag(boolean flag) {
   this.flag = flag;
 }
}

MainActivity布局文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.baway.twoshopcar.MainActivity">

<LinearLayout
   android:id="@+id/ll"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_alignParentBottom="true"
   android:orientation="horizontal">

<CheckBox
     android:id="@+id/cb_all"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_gravity="center_vertical"
     android:text="全选" />

<TextView
     android:layout_width="wrap_content"
     android:layout_height="match_parent"
     android:layout_marginLeft="20dp"
     android:gravity="center_vertical"
     android:text="合计:" />

<TextView
     android:id="@+id/totalPrice"
     android:layout_width="wrap_content"
     android:layout_height="match_parent"
     android:layout_marginLeft="10dp"
     android:gravity="center_vertical"
     android:text="22" />

<TextView
     android:layout_width="wrap_content"
     android:layout_height="match_parent"
     android:layout_marginLeft="30dp"
     android:gravity="center_vertical"
     android:text="数量" />

<TextView
     android:id="@+id/totalNum"
     android:layout_width="wrap_content"
     android:layout_height="match_parent"
     android:layout_marginLeft="10dp"
     android:gravity="center_vertical"
     android:text="22" />
 </LinearLayout>

<ExpandableListView
   android:id="@+id/elv"
   android:layout_above="@id/ll"
   android:layout_width="match_parent"
   android:layout_height="match_parent"></ExpandableListView>

</RelativeLayout>

childitem布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="40dp"
 android:background="#330000ff"
 android:paddingLeft="20dp"
 android:gravity="center_vertical"
 android:orientation="horizontal">

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

<TextView
   android:id="@+id/tvName"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginLeft="5dp" />

<TextView
   android:id="@+id/tvPrice"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginLeft="60dp" />

</LinearLayout>

groupitem布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#330000ff"
android:gravity="center_vertical"
android:orientation="horizontal">

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

<TextView
 android:id="@+id/tvName"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginLeft="5dp" />

</LinearLayout>

来源：http://blog.csdn.net/jie13717766447/article/details/78336799