android折叠展开列表测试

package com.example.expandablelistview;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.os.Bundle;
import android.app.ExpandableListActivity;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.Toast;

public class MainActivity extends ExpandableListActivity {

	List> gruops = new ArrayList>();
	List>> childs = new ArrayList>>();
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		addg(new String[]{"group1","group2"});
		addc(new String[][]{{"test1","test2"},{"111","222","333"}});

		SimpleExpandableListAdapter sela = new SimpleExpandableListAdapter(
				this, gruops, R.drawable.groups, new String[] { "group" },
				new int[] { R.id.textGroup }, childs, R.drawable.childs,
				new String[] { "child" }, new int[] { R.id.textChild });
		setListAdapter(sela);
		DisplayMetrics dm = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(dm);
		getExpandableListView().setIndicatorBounds(dm.widthPixels, dm.widthPixels); 
		sela.notifyDataSetChanged();
	}
	
	private void addg(String[] c){
		for (int i = 0; i < c.length; i++) {
			Map tmp = new HashMap();
			tmp.put("group",c[i]);
			gruops.add(tmp);
		}
	}
	
	private void addc(String[][] c){
		for (int i = 0; i < c.length; i++) {
			List> child = new ArrayList>();
			for (int j = 0; j < c[i].length; j++) {
				Map tmp = new HashMap();
				tmp.put("child",c[i][j]);
				child.add(tmp);
			}
			childs.add(child);
		}
	}

	@Override
	public boolean onChildClick(ExpandableListView parent, View v,
			int groupPosition, int childPosition, long id) {
		Toast.makeText(
				MainActivity.this,"您选择了"
						+ gruops.get(groupPosition).toString()
						+ childs.get(groupPosition).get(childPosition)
								.toString(), Toast.LENGTH_SHORT).show();
		return super.onChildClick(parent, v, groupPosition, childPosition, id);
	}

	@Override
	public boolean setSelectedChild(int groupPosition, int childPosition,
			boolean shouldExpandGroup) {
		return super.setSelectedChild(groupPosition, childPosition,
				shouldExpandGroup);
	}

	@Override
	public void setSelectedGroup(int groupPosition) {
		super.setSelectedGroup(groupPosition);
	}
}

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