Android ExpandableListView展开列表控件使用实例

//该界面非常简单， 只要一个ExpandableListView即可
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ExpandableListView
        android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
</LinearLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
>
    <TextView
        android:id="@+id/textGroup"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:paddingLeft="40px"
        android:paddingTop="6px"
        android:paddingBottom="6px"
        android:textSize="15sp"
        android:text="No data"
    />

</LinearLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
>
　　  <TextView 
        android:id="@+id/textChild"
   android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:paddingLeft="60px"
        android:paddingTop="10px"
        android:paddingBottom="10px"
        android:textSize="20sp"
   android:text="No Data"
/>

</LinearLayout>

public class ExpandActivity extends ExpandableListActivity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //创建二个一级条目标题
        Map<String, String> title_1 = new HashMap<String, String>();
        Map<String, String> title_2 = new HashMap<String, String>();
       
        title_1.put("group", "开发");
        title_2.put("group", "管理");
       
        //创建一级条目容器
        List<Map<String, String>> gruops = new ArrayList<Map<String,String>>();
       
        gruops.add(title_1);
        gruops.add(title_2);
       
        //创建二级条目内容
       
        //内容一
        Map<String, String> content_1 = new HashMap<String, String>();
        Map<String, String> content_2 = new HashMap<String, String>();
       
        content_1.put("child", "VC++");
        content_2.put("child", "Java");
       
        List<Map<String, String>> childs_1 = new ArrayList<Map<String,String>>();
        childs_1.add(content_1);
        childs_1.add(content_2);
       
        //内容二
        Map<String, String> content_3 = new HashMap<String, String>();
        Map<String, String> content_4 = new HashMap<String, String>();
       
        content_3.put("child", "敏捷开发");
        content_4.put("child", "迭代开发");
       
        List<Map<String, String>> childs_2 = new ArrayList<Map<String,String>>();
        childs_2.add(content_3);
        childs_2.add(content_4);
       
        //存放两个内容, 以便显示在列表中
        List<List<Map<String, String>>> childs = new ArrayList<List<Map<String,String>>>();
        childs.add(childs_1);
        childs.add(childs_2);
       
        //创建ExpandableList的Adapter容器
        //参数: 1.上下文    2.一级集合 3.一级样式文件 4. 一级条目键值  5.一级显示控件名
        //   6. 二级集合 7. 二级样式 8.二级条目键值 9.二级显示控件名
        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}
                );
       
        //加入列表
        setListAdapter(sela);
    }
}
//最后， 如果想响应各操作的话， 就要重载下面的方法
//列表内容按下
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)
{
    // TODO Auto-generated method stub
    return super.onChildClick(parent, v, groupPosition, childPosition, id);
}

//二级标题按下
@Override
public boolean setSelectedChild(int groupPosition, int childPosition, boolean shouldExpandGroup)
{
    // TODO Auto-generated method stub
    return super.setSelectedChild(groupPosition, childPosition, shouldExpandGroup);
}

//一级标题按下
@Override
public void setSelectedGroup(int groupPosition)
{
    // TODO Auto-generated method stub
    super.setSelectedGroup(groupPosition);
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ExpandableListView android:id="@+id/elv" android:indicatorRight="160dp"
        android:layout_width="fill_parent" android:layout_height="fill_parent">
    </ExpandableListView>
    <!-- indicatorRight 设置那个小图标右边缘与 ExpandableListView左边缘的间距-->
</LinearLayout>

package com.test;
 
import java.util.ArrayList;
 
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams;
 
public class ElvAdapter extends BaseExpandableListAdapter
{
 
    ArrayList<ElvObject> objs;
    Context context;
    ElvAdapter(Context context,ArrayList<ElvObject> objs)
    {
        this.objs=objs;
        this.context=context;
    }
    @Override
    public Object getChild(int groupPosition, int childPosition)
    {
        // TODO Auto-generated method stub
        return objs.get(groupPosition).childs.get(childPosition);
    }
 
    @Override
    public long getChildId(int groupPosition, int childPosition)
    {
        // TODO Auto-generated method stub
        return childPosition;
    }
 
    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
    {
        //子元素的View
        TextView tv=new TextView(context);
        tv.setText(objs.get(groupPosition).childs.get(childPosition));
        tv.setLayoutParams(new ExpandableListView.LayoutParams(ExpandableListView.LayoutParams.FILL_PARENT,ExpandableListView.LayoutParams.WRAP_CONTENT));
        return tv;
    }
 
    @Override
    public int getChildrenCount(int groupPosition)
    {
        // TODO Auto-generated method stub
        return objs.get(groupPosition).childs.size();
    }
 
    @Override
    public Object getGroup(int groupPosition)
    {
        // TODO Auto-generated method stub
        return objs.get(groupPosition);
    }
 
    @Override
    public int getGroupCount()
    {
        // TODO Auto-generated method stub
        return objs.size();
    }
 
    @Override
    public long getGroupId(int groupPosition)
    {
        // TODO Auto-generated method stub
        return groupPosition;
    }
 
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
    {
        //分组的View
        TextView tv=new TextView(context);
        tv.setText(objs.get(groupPosition).groupName);
        ExpandableListView.LayoutParams params=new ExpandableListView.LayoutParams(ExpandableListView.LayoutParams.FILL_PARENT,60);
        tv.setLayoutParams(params);
        return tv;
    }
 
    @Override
    public boolean hasStableIds()
    {
        // TODO Auto-generated method stub
        return false;
    }
 
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition)
    {
        // TODO Auto-generated method stub
        return true;
    }
 
}

class ElvObject{
    String groupName="";
    ArrayList<String> childs=new ArrayList<String>();
    ElvObject(String groupName,ArrayList<String> childs)
    {
        this.groupName=groupName;
        this.childs=childs;
    }
}

package com.test;
 
import java.util.ArrayList;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.ExpandableListView;
 
public class AndroidTestActivity extends Activity
{
    /** Called when the activity is first created. */
    ExpandableListView elv;
    ElvAdapter adapter;
    ArrayList<ElvObject> objs=new ArrayList<ElvObject>();
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        elv=(ExpandableListView)findViewById(R.id.elv);
        adapter=new ElvAdapter(this,objs);
        elv.setAdapter(adapter);
        ArrayList<String> list=new ArrayList<String>();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        objs.add(new ElvObject("英文",list));
        ArrayList<String> list2=new ArrayList<String>();
        list2.add("111");
        list2.add("222");
        list2.add("333");
        list2.add("444");
        objs.add(new ElvObject("数字",list2));
 
    }
}