最近一段时间参考网上的例子，做了一下简单的 ExpandableListView，现在和大家共享一下：

1：main.xml的内容

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout   
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout"  
android:layout_width="fill_parent"   
android:layout_height="fill_parent"  
androidrientation="vertical"  
>  
<ExpandableListView  
android:id="@+id/expandableListView"  
android:layout_width="fill_parent"  
android:layout_height="wrap_content"  
/>  
</LinearLayout> 

显示一个ExpandableListView

2：ExpandableListViewDemo 类的内容

package com.chama.expandablelistviewdemo;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
public class ExpandableListViewDemo extends Activity {
//定义两个List，用来存放控件中Group/Child中的String
private List<String> groupArray;        
private List<List<String>> childArray;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//对这两个List进行初始化，并插入一些数据
groupArray = new ArrayList<String>();  
childArray = new ArrayList<List<String>>();  
groupArray.add("第一行");  
groupArray.add("第二行");  
List<String> tempArray = new ArrayList<String>();  
tempArray.add("第一条");  
tempArray.add("第二条");  
tempArray.add("第三条");  
for(int index = 0; index <groupArray.size(); ++index)  
{  
childArray.add(tempArray);  
}  
//给定义好的ExpandableListView添加上Adapter
ExpandableListView expandableListView = (ExpandableListView)findViewById(R.id.expandableListView);
ExpandableAdapter adapter = new ExpandableAdapter(this);
expandableListView.setAdapter(adapter);
}
//定义ExpandableListView的Adapter
public class ExpandableAdapter extends BaseExpandableListAdapter  
{  
Activity activity;  
public ExpandableAdapter(Activity a)  
{  
activity = a;  
}  
public Object getChild(int groupPosition, int childPosition)  
{  
return childArray.get(groupPosition).get(childPosition);  
} 
public long getChildId(int groupPosition, int childPosition)  
{  
return childPosition;  
} 
public int getChildrenCount(int groupPosition)  
{  
return childArray.get(groupPosition).size();  
} 
public View getChildView(int groupPosition, int childPosition,  
boolean isLastChild, View convertView, ViewGroup parent)  
{  
String string = childArray.get(groupPosition).get(childPosition);  
return getGenericView(string);  
}  
// group method stub  
public Object getGroup(int groupPosition)  
{  
return groupArray.get(groupPosition);  
}  
public int getGroupCount()  
{  
return groupArray.size();  
} 
public long getGroupId(int groupPosition)  
{  
return groupPosition;  
}  
public View getGroupView(int groupPosition, boolean isExpanded,  
View convertView, ViewGroup parent)  
{  
String string = groupArray.get(groupPosition);  
return getGenericView(string);  
}  
// View stub to create Group/Children 's View  
public TextView getGenericView(String string)  
{  
// Layout parameters for the ExpandableListView  
AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(  
ViewGroup.LayoutParams.FILL_PARENT, 64);  
TextView text = new TextView(activity);  
text.setLayoutParams(layoutParams);  
// Center the text vertically  
text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
// Set the text starting position  
text.setPadding(36, 0, 0, 0);  
text.setText(string);  
return text;  
}  
public boolean hasStableIds()  
{  
return false;  
}  
public boolean isChildSelectable(int groupPosition, int childPosition)  
{  
return true;  
}  
}  
}

需要注意的内容：

  1：groupArray 和childArray的内容，分别定义父对象和子对象显示的内容

  2：ExpandableAdapter继承了BaseExpandableListAdapter，并重载了其中的一些方法， 注意public TextView getGenericView(String string)的作用，主要用形成显示父对象和子对象视图的类

3：程序效果