项目中需要类似qq好友的通讯录，所以就写了一个简单的例子，分享一下。

效果：

1、MainActivity.java的代码：

package com.tbx.android;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.widget.ExpandableListView;public class MainActivity extends Activity {		ExpendAdapter adapter;		ExpandableListView exList;		private List
    
      parentList = new ArrayList
     
      ();	    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        exList = (ExpandableListView) this.findViewById(R.id.expandableListView1);        initData();        adapter = new ExpendAdapter(MainActivity.this, parentList);        exList.setAdapter(adapter);        exList.setGroupIndicator(null);        exList.setDivider(null);    }	private void initData() {		GroupElement group1 = new GroupElement();		ChildElement childElement = new ChildElement();		childElement.setMood("我喜欢王");		childElement.setResoureid(R.drawable.f009);		childElement.setTitle("小鸟");		group1.putChildElement(childElement);		childElement = new ChildElement();		childElement.setMood("我喜欢王");		childElement.setResoureid(R.drawable.f010);		childElement.setTitle("android");		group1.putChildElement(childElement);		group1.setTitle("我的好友");		parentList.add(group1);						GroupElement group2 = new GroupElement();		childElement = new ChildElement();		childElement.setMood("我喜欢王");		childElement.setResoureid(R.drawable.f009);		childElement.setTitle("小鸟");		group2.putChildElement(childElement);		childElement = new ChildElement();		childElement.setMood("我喜欢王");		childElement.setResoureid(R.drawable.f010);		childElement.setTitle("android");		group2.putChildElement(childElement);		group2.setTitle("高中同学");		parentList.add(group2);	}   }
     
    

2、ExpendAdapter.java 代码：

package com.tbx.android;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;import java.util.*;public class ExpendAdapter extends BaseExpandableListAdapter {		private LayoutInflater layoutInflater;    private Context mContext;          private List
    
      parentList = new ArrayList
     
      ();      	public ExpendAdapter(Context mContext,List
      
        parentList){				this.mContext = mContext;		this.parentList = parentList;				layoutInflater = LayoutInflater.from(mContext);	}	public Object getChild(int groupPosition, int childPosition) {		GroupElement group = parentList.get(groupPosition);		if(group!=null){			return group.getChildElement(childPosition);		}		return null;	}	@Override	public long getChildId(int groupPosition, int childPosition) {		return childPosition;	}	@Override	public View getChildView(int groupPosition, int childPosition,			boolean isLastChild, View convertView, ViewGroup parent) {				if(convertView ==null){			convertView = layoutInflater.inflate(R.layout.child, null);					}				GroupElement groupElement = parentList.get(groupPosition);		ChildElement childElement = groupElement.getChildElement(childPosition);		if(childElement == null){			return null ;		}		final ImageView head=(ImageView)convertView.findViewById(R.id.headImage);		   head.setImageResource(childElement.getResoureid());		final TextView title=(TextView)convertView.findViewById(R.id.title);		  title.setText(childElement.getTitle());		  	    final TextView mood =(TextView)convertView.findViewById(R.id.mood);	      mood.setText(childElement.getMood());		return convertView;	}	@Override	public int getChildrenCount(int groupPosition) {		GroupElement group = parentList.get(groupPosition);		if(group!=null){			return group.getChildSize();		}		return 0;	}	@Override	public Object getGroup(int groupPosition) {		return parentList.get(groupPosition);	}	@Override	public int getGroupCount() {		return parentList.size();	}	@Override	public long getGroupId(int groupPosition) {		return groupPosition;	}	@Override	public View getGroupView(int groupPosition, boolean isExpanded,			View convertView, ViewGroup parent) {				if(convertView==null){			convertView=layoutInflater.inflate(R.layout.parent, null);					}		final TextView user_group_name = (TextView) convertView.findViewById(R.id.user_group_name);		user_group_name.setText(parentList.get(groupPosition).getTitle());				final TextView user_group_size = (TextView) convertView.findViewById(R.id.user_group_size);		int size = parentList.get(groupPosition).getChildSize();		user_group_size.setText("["+size+"]");		  		final ImageView imageView = (ImageView) convertView.findViewById(R.id.user_group);		if(isExpanded){			imageView.setBackgroundResource(R.drawable.group_unfold_arrow);		}else{			imageView.setBackgroundResource(R.drawable.group_fold_arrow);		}				return convertView;	}	    @Override	public void onGroupCollapsed(int groupPosition) {		super.onGroupCollapsed(groupPosition);			}	@Override	public void onGroupExpanded(int groupPosition) {		super.onGroupExpanded(groupPosition);	}	@Override	public boolean hasStableIds() {		return true;	}	@Override	public boolean isChildSelectable(int groupPosition, int childPosition) {		Toast.makeText(mContext, "这是第"+groupPosition+"组，第"+childPosition+"个", Toast.LENGTH_SHORT).show();		return true;	}}
      
     
    

3、GroupElement.java 代码：

package com.tbx.android;import java.util.ArrayList;public class GroupElement {	private String title ;	private String img ;		private List
    
      childList = new ArrayList
     
      ();			public ChildElement getChildElement(int childPosition){		return childList.get(childPosition);	}		public void putChildElement(ChildElement childElement){		childList.add(childElement);	}		public int getChildSize(){		return childList.size();	}	public String getTitle() {		return title;	}	public void setTitle(String title) {		this.title = title;	}	public String getImg() {		return img;	}	public void setImg(String img) {		this.img = img;	}	public List
      
        getChildList() {		return childList;	}	public void setChildList(List
       
         childList) {		this.childList = childList;	}	}
       
      
     
    

4、ChildElement.java代码：

public class ChildElement {	private String title ;	private boolean isOnline ;	private int resoureid; //显示图片的资源id	private String mood ; //心情        ....}

5、main.xml

6、parent.xml

7、child.xml

这是所有的主要代码，至于图片我就不上除了，如果那位同学想看看，可以留言。后面会对ExpandableListView详细分析