ExpandableListView

1.设置ExpandableListView 默认是展开的:

先实例化exListView 然后

exListView.setAdapter(exlvAdapter);
//遍历所有group,将所有项设置成默认展开
intgroupCount = exListView.getCount();
for (inti=0; i<groupCount; i++)
{
exListView.expandGroup(i);
};

2.只展开一个组，关闭其他组，expandablelistview响应onGroupClick监听:设置expandablelistview.setOnGroupClickListener()
折叠和展开事件，可以设置setOnGroupCollapseListener和setOnGroupExpandListener

exListView .setOnGroupExpandListener(new OnGroupExpandListener() {

@Override
public void onGroupExpand(int groupPosition) {
for (int i = 0, count = onlineUsersListView
.getExpandableListAdapter().getGroupCount(); i < count; i++) {
if (groupPosition != i) {// 关闭其他分组
exListView.collapseGroup(i);
}
}
}
});

3.默认展开第一个分组：

exListView.expandGroup(0);

4.去掉ExpandableListView 默认的箭头

exListView .setGroupIndicator(null);

5.将默认的箭头修改到右边显示:
（1）首先ExpandableListViewelistview;

exListView.setGroupIndicator(null);//将控件默认的左边箭头去掉，

（2）在自定义的继承自BaseExpandableListAdapter的adapter中有一个方法

/** * 父类view */ @Override
public View getGroupView(intgroupPosition, booleanisExpanded, View convertView, ViewGroup parent)
{ Log.i("zhaoxiong","parent view");
LinearLayoutparentLayout=(LinearLayout) View.inflate(context, R.layout.wowocoupons_parent_item, null);
TextViewparentTextView=(TextView)parentLayout.findViewById(R.id.parentitem);
parentTextView.setText(parentlist.get(groupPosition));
ImageViewparentImageViw=(ImageView) parentLayout.findViewById(R.id.arrow);
//判断isExpanded就可以控制是按下还是关闭，同时更换图片
if(isExpanded){
parentImageViw.setBackgroundResource(R.drawable.arrow_down);
}else{
parentImageViw.setBackgroundResource(R.drawable.arrow_up); }
return parentLayout;
}

6.expandablelistview的Group点击事件，onGroupClick的返回值false展开，true不展开

exListView.setOnGroupClickListener(new OnGroupClickListener() {

@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
IsFlag=true;

if(adapter.getGroupData().get(groupPosition).getList().size()==1){
Bundle b=new Bundle();
b.putInt("saveIndex", 0);
b.putSerializable("datalist", adapter.getGroupData().get(groupPosition).getList());
Intent i=new Intent(WappushBindingActivity.this,VideoPlayerActivity.class);
i.putExtras(b);
startActivity(i);
}
//                int groupCount = tt_list.getCount();
//                for (int i=0; i<groupCount; i++){
//                    if(i!=GroupPosition)
//                        tt_list.collapseGroup(i);
//                 };
//                Log.v("xulongheng*WappushBind*tt_list", "onGroupClick:"+previousX+"/"+previousY);
return true;   //默认为false，设为true时，点击事件不会展开Group
}
});

7.demo：

效果：



布局文件

main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ExpandableListView
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="match_parent"
style="@style/myExpandableListView"
android:drawSelectorOnTop="false"
/>
<TextView
android:id="@id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="no data"
/>
</LinearLayout>

第一级条目布局
group.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/groupTo"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="40px"
android:paddingTop="3px"
android:paddingBottom="3px"
android:textSize="26sp"
android:text="No data"
/>
</LinearLayout>

第二级条目布局

child.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/childTo"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="50px"
android:paddingTop="5px"
android:paddingBottom="5px"
android:textSize="20sp"
android:text="No data"/>

</LinearLayout>

在drawable-mdpi中定义my_expander_group.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="@drawable/ic_picture" ></item>
</selector>

MainActivity.java

package org.wwj.view;

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.SimpleExpandableListAdapter;

public class MainActivity extends ExpandableListActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

//定义一个List，该List对象为一级条目提供数据
List<Map<String, String>> groups = new ArrayList<Map<String,String>>();
Map<String, String> group1 = new HashMap<String, String>();
group1.put("group", "第一组");
Map<String, String> group2 = new HashMap<String, String>();
group2.put("group", "第二组");
groups.add(group1);
groups.add(group2);

//定义一个List，该List对象为第一个一级条目提供二级条目的数据
List<Map<String, String>> child1 = new ArrayList<Map<String,String>>();
Map<String, String> child1data1 = new HashMap<String, String>();
child1data1.put("child", "第一条");
child1.add(child1data1);
Map<String, String> child1data2 = new HashMap<String, String>();
child1data2.put("child", "第二条");
child1.add(child1data2);

//定义一个List，该List对象为第二个一级条目提供二级条目的数据
List<Map<String, String>> child2 = new ArrayList<Map<String,String>>();
Map<String, String> child2data1 = new HashMap<String, String>();
child2data1.put("child", "第三条");
child2.add(child2data1);
Map<String, String> child2data2 = new HashMap<String, String>();
child2data2.put("child", "第四条");
child2.add(child2data2);

//定义一个List，该List对象存储所有的二级条目的数据
List<List<Map<String, String>>> childs = new ArrayList<List<Map<String,String>>>();
childs.add(child1);
childs.add(child2);

//生成一个SimpleExpandableListAdapter对象
//1.context
//2.一级条目的数据
//3.用来设置一级条目样式的布局文件
//4.指定一级条目数据的key
//5.指定一级条目数据显示控件的id
//6.指定二级条目的数据
//7.用来设置二级条目样式的布局文件
//8.指定二级条目数据的key
//9.指定二级条目数据显示控件的id
SimpleExpandableListAdapter adapter = new SimpleExpandableListAdapter(this
, groups
, R.layout.group
, new String[]{"group"}
, new int[] {R.id.groupTo}
, childs
, R.layout.child
, new String[]{"child"}
, new int[] {R.id.childTo}
);
//将SimpleExpandableListAdapter对象设置给当前的ExpandableListActivity
setListAdapter(adapter);

}
}

参考链接：http://blog.csdn.net/wwj_748/article/details/7866584