二级列表SimpleExpandableListAdapter ，ExpandableListAdapter

第一种

package com.bwei.expandablelistview;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;

public class MainActivity extends Activity {
// 一级数据源
private String[] names = new String[] { "百度", "腾讯", "王过" };
// 二级数据源
private String[][] items = new String[][] { { "百度地图", "百度外卖", "百度云" },
{ "QQ", "微信", "王者荣耀" }, { "AK47", "直播","茶杯" } };

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 找控件
ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv);
// 数据   定义子列表项List数据集合
List<List<Map<String, String>>> data = new ArrayList<List<Map<String, String>>>();

// 创建数据 一级    //定义父列表项List数据集合
List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();

for (int i = 0; i < names.length; i++) {
//提供父列表的数据
Map<String, String> map = new HashMap<String, String>();
map.put("name", names[i]);
groupData.add(map);
// 二级数据源   提供当前父列的子列数据
List<Map<String, String>> childData2 = new ArrayList<Map<String, String>>();

for (int j = 0; j < items.length; j++) {
Map<String, String> map2 = new HashMap<String, String>();
map2.put("item", items[i][j]);
childData2.add(map2);

}
data.add(childData2);

}
/**
* 第一个参数  应用程序接口 this
* 第二个父列List<?extends Map<String,Object>>集合 为父列提供数据
* 第三个参数  父列显示的组件资源文件
* 第四个参数  键值列表 父列Map字典的key
* 第五个要显示的父列组件id
* 第六个 子列的显示资源文件
* 第七个参数 键值列表的子列Map字典的key
* 第八个要显示子列的组件id
*/
// 创建适配器
SimpleExpandableListAdapter adapter = new SimpleExpandableListAdapter(
this, groupData, R.layout.group_layout,
new String[] { "name" }, new int[] { R.id.tv_name }, data,
R.layout.child_layout, new String[] { "item" },
new int[] { R.id.tv_child });
// 设置适配器
elv.setAdapter(adapter);
}

}

第二种方式

package com.bwei.expandablelistview;

import android.os.Bundle;
import android.app.Activity;
import android.database.DataSetObserver;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
// 一级数据源
private String[] names = new String[] { "百度", "腾讯", "王过" };
// 二级数据源
private String[][] items = new String[][] { { "百度地图", "百度外卖", "百度云" },
{ "QQ", "微信", "王者荣耀" }, { "AK47", "直播" } };

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 找控件
ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv);

// 创建适配器
MyExpandableListAdapter adapter = new MyExpandableListAdapter();
// 设置适配器
elv.setAdapter(adapter);
// 点击一级条目
elv.setOnGroupExpandListener(new OnGroupExpandListener() {

@Override
public void onGroupExpand(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "跳转吧" + groupPosition, 0)
.show();

}
});
// 设置一级的箭头
// elv.setGroupIndicator(null);
/*
* elv.setOnChildClickListener(new OnChildClickListener() {
*
* @Override public boolean onChildClick(ExpandableListView parent, View
* v, int groupPosition, int childPosition, long id) { // TODO
* Auto-generated method stub Toast.makeText(MainActivity.this,
* "跳转:"+childPosition, 0).show(); return false; } });
*/

}

private class MyExpandableListAdapter implements ExpandableListAdapter {

@Override
public void registerDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub

}

@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub

}

// 一级数据个数
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return names.length;
}

// 二级数据个数
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return items[groupPosition].length;
}

@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return names[groupPosition];
}

@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return items[groupPosition][childPosition];
}

@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return 0;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return 0;
}

@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}

// 加载一级布局
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View view =null;
if (groupPosition == 0) {
view = View.inflate(MainActivity.this, R.layout.group_layout,
null);
} else {
view = View.inflate(MainActivity.this, R.layout.group,
null);
}

TextView tv_name = (TextView) view.findViewById(R.id.tv_name);
tv_name.setText(names[groupPosition]);

return view;
}

// 加载二级布局
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub

View view = View.inflate(MainActivity.this, R.layout.child_layout,
null);
TextView tv_child = (TextView) view.findViewById(R.id.tv_child);
tv_child.setText(items[groupPosition][childPosition]);
return view;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return false;
}

@Override
public boolean areAllItemsEnabled() {
// TODO Auto-generated method stub
return false;
}

@Override
public boolean isEmpty() {
// TODO Auto-generated method stub
return false;
}

@Override
public void onGroupExpanded(int groupPosition) {
// TODO Auto-generated method stub

}

@Override
public void onGroupCollapsed(int groupPosition) {
// TODO Auto-generated method stub

}

@Override
public long getCombinedChildId(long groupId, long childId) {
// TODO Auto-generated method stub
return 0;
}

@Override
public long getCombinedGroupId(long groupId) {
// TODO Auto-generated method stub
return 0;
}

}

}