andorid ExpandableListView 用法

public class ExpandableListViewActivity extends Activity {
//声明对象
private SimpleExpandableListAdapter adapter=null;
List<Map<String,String>> groups;
List<List<Map<String,String>>> childs;
ExpandableListView expandableListView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.expandable_list_view);


//为ExpandableListView 准备数据
groups=new ArrayList<Map<String,String>>();
Map<String,String> group1= new HashMap<String, String>();
group1.put("group", "我的家人");

Map<String,String> group2=new HashMap<String,String>();
group2.put("group", "我的朋友");

groups.add(group1);
groups.add(group2);

childs =new ArrayList<List<Map<String,String>>>();
List<Map<String,String>> child1=new ArrayList<Map<String,String>>();
Map<String,String> child1Data1=new HashMap<String, String>();
child1Data1.put("child", "妈妈");
child1.add(child1Data1);
Map<String,String> child1Data2=new HashMap<String, String>();
child1Data2.put("child", "爸爸");
child1.add(child1Data2);

List<Map<String,String>> child2=new ArrayList<Map<String,String>>();
    Map<String,String> child1Data3=new HashMap<String, String>();
    child1Data3.put("child", "小飞");
    child2.add(child1Data3);
    Map<String,String> childData4=new HashMap<String, String>();
    childData4.put("child", "小武");
    child2.add(childData4);
    childs.add(child1);
    childs.add(child2);
   
    //得到ExpandableListView对象
    expandableListView =(ExpandableListView)findViewById(R.id.expandable_1);
    //实例化适配器
    adapter=new SimpleExpandableListAdapter(this,groups,R.layout.tree_group,
    new String[]{"group"},new int[]{R.id.tree_group_textView},
    childs,R.layout.tree_child,new String[]{"child"},new int[]{R.id.textView1}
    );
   
    //设置适配器
    expandableListView.setAdapter(adapter);
   
    //设置监听器
    expandableListView.setOnChildClickListener(new OnChildClickListener(){
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Log.d("text","group"+groupPosition);
Log.d("text", "child"+childPosition);
return false;
}});
}
}