Android中的ExpandableLists,我想一次只允许一个父列表扩展

public void onCreate(Bundle savedInstanceStatE) {
        try{
             super.onCreate(savedInstanceStatE);
             setContentView(R.layout.main);

        final Simpleexpandablelistadapter explistadapter =
            new Simpleexpandablelistadapter(
                        //FOR LEVEL 1 SCREEN
                    this,createGroupList(),// METHOD TO CREATE PARENTLIST CreaTing group List.
                    R.layout.group_row,// REF TO XML FILename.         
                    new String[] { "Group Item" },// StriNG ARRAY HOLDING one key THAT REF'S ALL PARENT LIST ITEMs.
                    new int[] { R.id.row_name },// REF TO I.D. OF PARENT XMl. ID of each group item.-Data under the key goes into this TextView.                    
                    createChildList(),// METHOD TO CREATE CHILD LST. childData describes second-level entries.
                    R.layout.child_row,// XMLFILE NAME FOR CHILD LIST.Layout for sub-level entries(second level).
                    new String[] {"Sub Item"},// KEY FOR CHILD ITEMS IN HASHMAP. Keys in childData maps to display.
                    new int[] { R.id.grp_chilD}     // XML ID FOR TEXTVIEW. Data under the keys above go into these TextViews.
                );
            setlistadapter( explistadapter );       // setTing the adapter in the list.

        //**THIS IS what I DONT KNow HOW TO CODE:**


            list = (ExpandableListView) findViewById(R.id.row_Name);
            list.setAdapter( explistadapter);
            list.setGroupInDicator(null);


            list.setOnGroupExpandListener(new OnGroupExpandListener() {

                public void onGroupExpand(int groupPosition) {
                    int len = explistadapter.getGroupCount();
                    for (int i = 0; i < len; i++) {
                        if (i != groupPosition) {
                            list.collapseGroup(i);
                        }
                    }
                }
            });

        }catch(Exception E){

            System.out.println("Errrr +++ " + e.getmessage());
        }
    }

我理解上面的代码,但是,我不使用expandableListViews,我使用expandablelist的布局将我的程序保存到我的.xml文件中.所以我不知道如何将上述内容应用到我的程序中……

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="@R_944_10107@://scheR_789_11845@as.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
 <ExpandableListView android:id="@+id/list"
               android:layout_width="fill_parent" 
               android:layout_height="fill_parent"
               android:BACkground="@drawable/bkg"/>

     <TextView android:id="@+id/android:empty"
               android:layout_width="fill_parent" 
               android:layout_height="fill_parent"
               android:text="No items"/>
</LinearLayout>

我不知道如何申请的方法如下：

list = (ExpandableListView) findViewById(R.id.row_Name);
            list.setAdapter( explistadapter);
            list.setGroupInDicator(null);

            list.setOnGroupExpandListener(new OnGroupExpandListener() {
                    public void onGroupExpand(int groupPosition) {
                    int len = explistadapter.getGroupCount();
                    for (int i = 0; i < len; i++) {
                        if (i != groupPosition) {
                            list.collapseGroup(i);
                        }
                    }
                }
            });

1)如何将“列表”引用到我的expandablelist活动？

list在类中定义为私有的ExpandableListView列表;

我现在没有任何错误,但该方法不起作用.

任何帮助是极大的赞赏！