Android Trick - select Gridview item and make the cell highlighted

As Title said, I am making a customized calendar view .

For date part I am using Gridview.

But after I set item background and using setSelection(int)

I could not highlighted the item I selected.

this is the drawable for cell view background.


<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/bg_purple_round_corner" android:state_pressed="true">
    <item android:drawable="@drawable/bg_purple_round_corner" android:state_checked="true">
    <item android:drawable="@drawable/bg_purple_round_corner" android:state_selected="true">
    <item android:drawable="@drawable/bg_white_round_corner" android:state_pressed="false">

</item></item></item></item></selector>

This is the gridview codes:

                 gvDates.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView arg0, View arg1, int arg2,
long arg3) {
Object obj = arg0.getAdapter().getItem(arg2);
if(obj!=null &amp;&amp; obj instanceof Calendar){

if(listener!=null){
listener.onDateSelected((Calendar) obj);
gvDates.requestFocusFromTouch();
gvDates.setSelection(arg2);
}
}
}
});


The key part is before setSelection(int) . have to call requestFocusFromTouch();

To be continue...for checking the reason...