android - ExpandableListView ignores setSelectedChild() -

i try select item in expandablelistview using setselectedchild(int groupposition, int childposition, boolean shouldexpandgroup), nothing happens.

here's primitive activity tested with:

import android.app.activity; import android.graphics.color; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.view.viewgroup; import android.widget.baseexpandablelistadapter; import android.widget.button; import android.widget.expandablelistview; import android.widget.textview;  public class startupactivity extends activity {      private static final string[] _items = new string[] {"oops", "wham", "bam"};      private expandablelistview _explist;     private textview _txt_hello;     private button _btn_sel;     private myexplistadapter _explist_adapter;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);           _explist = (expandablelistview) findviewbyid(r.id.explistmain);               _txt_hello = (textview) findviewbyid(r.id.txthello);            _btn_sel = (button) findviewbyid(r.id.btnaction);           _btn_sel.setonclicklistener(new onclicklistener() {             @override             public void onclick(view arg0) {                 selectelement();             }                      });     }      @override     protected void onresume() {         super.onresume();          _explist_adapter = new myexplistadapter();         _explist.setadapter(_explist_adapter);         _explist.expandgroup(0);     }      private void selectelement() {         boolean success = _explist.setselectedchild(0, 1, true);         long sel = _explist.getselectedid();          _txt_hello.settext((success ? "success" : "failure") + " " + sel);         //setselectedchild() returns true         //but getselectedid() returns -1 , nothing selected     }      public class myexplistadapter extends baseexpandablelistadapter {          @override         public object getchild(int groupposition, int childposition) {             return _items[childposition];         }          @override         public long getchildid(int groupposition, int childposition) {             return childposition;         }          @override         public view getchildview(int groupposition, int childposition, boolean islastchild, view convertview, viewgroup parent) {             if (convertview == null) {                 convertview = new textview(startupactivity.this);             }             textview txt_view = (textview) convertview;             txt_view.settext(_items[childposition]);             txt_view.setheight(50);              return txt_view;         }          @override         public int getchildrencount(int groupposition) {              return _items.length;         }          @override         public object getgroup(int groupposition) {                      return getgroupid(groupposition);         }          @override         public int getgroupcount() {             return 1;         }          @override         public long getgroupid(int groupposition) {             return 0;         }          @override         public view getgroupview(int groupposition, boolean isexpanded, view convertview, viewgroup parent) {             textview txt_view = new textview(startupactivity.this);             txt_view.setbackgroundcolor(color.gray);             txt_view.setheight(50);             return txt_view;         }          @override         public boolean hasstableids() {                      return true;         }          @override         public boolean ischildselectable(int groupposition, int childposition) {                         return true;         }      } } 

the layout file:

<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:layout_width="fill_parent"         android:layout_height="wrap_content" android:text="@string/hello"         android:id="@+id/txthello" />     <button android:layout_width="wrap_content"         android:layout_height="wrap_content" android:id="@+id/btnaction"         android:text="select"></button>     <expandablelistview android:layout_width="match_parent"         android:id="@+id/explistmain" android:layout_height="fill_parent"></expandablelistview> </linearlayout> 

how can make work?

i wrestling issue in setselectedchild(int, int, true) did not expand group says does. got around using strikingly intuitive method of calling expandablelistview.expandgroup(int);

this answer given me co-worker, i'll pass props on if helps.