先看效果

demo实现
其他的方法和ListView的方法一样,下面来看看具体demo的实现
首先布局文件很简单,就一个控件为:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.duanlian.expendablelistviewdemo.MainActivity"><ExpandableListViewandroid:id="@+id/expendablelistview"android:layout_width="match_parent"android:layout_height="match_parent" />
</RelativeLayout>

Activity的代码和用ListView的是一样的,创建一个adapter和两个 数据源,然后绑定,具体如下:

package com.duanlian.expendablelistviewdemo;import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ExpandableListView;import com.duanlian.expendablelistviewdemo.adapter.MyAdapter;import java.util.ArrayList;
import java.util.List;public class MainActivity extends AppCompatActivity {private ExpandableListView expandableListView;private MyAdapter myAdapter;private List<String> groupList;private List<List<String>> childList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {expandableListView = (ExpandableListView) findViewById(R.id.expendablelistview);groupList = new ArrayList<>();childList = new ArrayList<>();addData("幼稚园同学",new String[]{"周杰伦","江一燕 ","佟丽娅","高圆圆","刘诗诗","刘亦菲","angleBaby","张静初","张含韵",});addData("小学同学",new String[]{"光头强","熊大","熊二","妙蛙种子","比卡丘","双蛋瓦斯","贪吃蛇"});addData("初中同学",new String[]{"苍井空","小泽玛利亚","吉泽明步","波多野结衣","爱川美里菜","小川阿佐美","桃谷绘里香","泷泽萝拉","北原多香子","石川施恩惠","北条麻妃","麻仓优","羽田爱","保坂绘里"});addData("高中同学",new String[]{"秦始皇","李世民","武则天","曹操","刘备","孙权"});addData("大学同学",new String[]{"周杰伦","江一燕 ","佟丽娅","高圆圆","刘诗诗","刘亦菲","angleBaby","张静初","张含韵",});addData("研究生同学",new String[]{"光头强","熊大","熊二","妙蛙种子","比卡丘","双蛋瓦斯","贪吃蛇"});addData("博士同学",new String[]{"苍井空","小泽玛利亚","吉泽明步","波多野结衣","爱川美里菜","小川阿佐美","桃谷绘里香","泷泽萝拉","北原多香子","石川施恩惠","北条麻妃","麻仓优","羽田爱","保坂绘里"});addData("教授同事",new String[]{"秦始皇","李世民","武则天","曹操","刘备","孙权"});addData("众仙家名册",new String[]{"苍井空","小泽玛利亚","吉泽明步","波多野结衣","爱川美里菜","小川阿佐美","桃谷绘里香","泷泽萝拉","北原多香子","石川施恩惠","北条麻妃","麻仓优","羽田爱","保坂绘里","秦始皇","李世民","武则天","曹操","刘备","孙权"});myAdapter = new MyAdapter(this,groupList,childList);expandableListView.setAdapter(myAdapter);}/*** 用来添加数据的方法*/private void addData(String group, String[] friend) {groupList.add(group);//每一个item打开又是一个不同的list集合List<String> childitem = new ArrayList<>();for (int i = 0; i < friend.length; i++) {childitem.add(friend[i]);}childList.add(childitem);}
}

然后Adapter里面需要2个item布局文件:
外层的item:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#ed88ed"tools:context="com.duanlian.expendablelistviewdemo.MainActivity"><TextViewandroid:id="@+id/group_textview"android:layout_width="wrap_content"android:layout_height="50dp"android:gravity="center_vertical"android:layout_marginLeft="40dp"android:textSize="20sp"android:text="我的好友"/><TextViewandroid:id="@+id/group_number"android:layout_width="wrap_content"android:layout_height="50dp"android:gravity="center_vertical"android:layout_marginRight="20dp"android:textSize="15sp"android:layout_alignParentRight="true"android:text="20"/>
</RelativeLayout>

里面那层item布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="40dp"tools:context="com.duanlian.expendablelistviewdemo.MainActivity"><com.duanlian.expendablelistviewdemo.CircleImageViewandroid:id="@+id/child_img"android:layout_width="30dp"android:layout_height="30dp"android:layout_marginLeft="10dp"android:layout_centerVertical="true"android:src="@mipmap/duanlian"/><TextViewandroid:id="@+id/child_name"android:layout_height="40dp"android:layout_width="wrap_content"android:layout_toRightOf="@+id/child_img"android:layout_marginLeft="15dp"android:textSize="16sp"android:gravity="center_vertical"android:text="吉泽明步"/><TextViewandroid:id="@+id/child_model"android:layout_width="wrap_content"android:layout_height="40dp"android:gravity="center_vertical"android:layout_alignParentRight="true"android:layout_marginRight="5dp"android:textSize="13sp"android:text="4G"/>
</RelativeLayout>

最总要的还是在Adapter里面,他和ListView一样,也有simpleAdapter和ArrayAdapter,和BaseAdapter,我这里用的是BaseAdapter,他的adapter继承的是BaseExpandableListAdapter:

package com.example.wxpandablelistviewdemo;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
import java.util.List;/*** Created by duanlian on 2016/9/12.*/
public class MyAdapter extends BaseExpandableListAdapter {private List<String> groupList;//外层的数据源private List<List<String>> childList;//里层的数据源private Context context;public MyAdapter(Context context, List<String> groupList,List<List<String>> childList ){this.context = context;this.groupList = groupList;this.childList = childList;}@Overridepublic int getGroupCount() {return groupList.size();}/*** 这个返回的一定要是对应外层的item里面的List集合的size* @param groupPosition* @return*/@Overridepublic int getChildrenCount(int groupPosition) {return childList.get(groupPosition).size();}@Overridepublic Object getGroup(int groupPosition) {return groupPosition;}@Overridepublic Object getChild(int groupPosition, int childPosition) {return childList.get(groupPosition).get(childPosition);}@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic boolean hasStableIds() {return true;}@Overridepublic View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {convertView = View.inflate(context, R.layout.item_group, null);//分组名字TextView textView = (TextView) convertView.findViewById(R.id.group_textview);//子元素的个数TextView number = (TextView) convertView.findViewById(R.id.group_number);number.setText(childList.get(groupPosition).size()+"个");textView.setText(groupList.get(groupPosition));return convertView;}@Overridepublic View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view, ViewGroup viewGroup) {view = View.inflate(context, R.layout.item_child, null);TextView textView = (TextView) view.findViewById(R.id.child_name);//外层的分组名字textView.setText(childList.get(groupPosition).get(childPosition));return view;}@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) {return true;}
}

demo地址：https://download.csdn.net/download/heishuai123/10941739
原博客地址：https://blog.csdn.net/dl10210950/article/details/52525492