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   源码介绍

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package com.test;

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

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;

    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);
    }
}