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小编给大家分享一下Android怎么实现二级列表购物车功能，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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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 groupList = new ArrayList<>();
private List> 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 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 groupList;
private List> childList;
private int count;
private int sumMoney;
public MyAdapter(Context context, List groupList, List> 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 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) {
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 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：