ExpandableList列表的简单应用

package src.com;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.widget.ExpandableListAdapter;
import android.widget.SimpleExpandableListAdapter;

public class expandableList extends ExpandableListActivity {
private static final String SHELF = "SHELF";
private static final String BOOK = "BOOK";

private ExpandableListAdapter mAdapter;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

List<Map<String,String>> groupData = new ArrayList<Map<String,String>>();
List<List<Map<String,String>>> childData = new ArrayList<List<Map<String,String>>>();

for ( int i = 1; i < 4; i++ ){
Map<String,String> curGroupMap = new HashMap<String,String>();
groupData.add(curGroupMap);
curGroupMap.put(SHELF, "BookShelf-"+i);

List<Map<String,String>> children = new ArrayList<Map<String,String>>();

for( int j = 1; j < 3; j++ ){
Map<String,String> curChildMap = new HashMap<String,String>();
children.add(curChildMap);
curChildMap.put(SHELF, "Book- "+j);
}
childData.add(children);
}

//Set up our adapter
mAdapter = new SimpleExpandableListAdapter(
this,
groupData,
android.R.layout.simple_expandable_list_item_1,
new String[]{SHELF,BOOK},
new int[] {android.R.id.text1, android.R.id.text2},
childData,
android.R.layout.simple_expandable_list_item_2,
new String[] {SHELF,BOOK},
new int[] {android.R.id.text1, android.R.id.text2}
);
setListAdapter(mAdapter);
}
}