先看效果

讯享网
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"> <ExpandableListView android: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:

讯享网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; @Override protected 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); } }

<?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"> <TextView android: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"/> <TextView android: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:

讯享网<?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.CircleImageView android:id="@+id/child_img" android:layout_width="30dp" android:layout_height="30dp" android:layout_marginLeft="10dp" android:layout_centerVertical="true" android:src="@mipmap/duanlian"/> <TextView android: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"/> <TextView android: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; } @Override public 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 */ @Override public int getChildrenCount(int groupPosition) { return childList.get(groupPosition).size(); } @Override public Object getGroup(int groupPosition) { return 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 true; } @Override public 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; } @Override public 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; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } }