问如何处理Gallery android中的位置？

EN

public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) {
        //previouse selected image  
//here sometimes it is changing background of another image(which is not a old selected image)  
        if(mSelectedItemIndex!=-1 && mSelectedItemIndex!=position){ 

//              Object v =mGallery.getItemAtPosition(mSelectedItemIndex);
//              View v =imageAdapter.getDropDownView(mSelectedItemIndex,null,null);
//          View v =mGallery.getChildAt(mSelectedItemIndex);
                View v = (View)view.getChildAt(mSelectedItemIndex);
            ImageView imgView = (ImageView) v.findViewById(R.id.adsimage);
//          ImageView imgView = (ImageView)v;

//          ImageView imgView = (ImageView)arg0.findViewById(R.id.adsimage);
            imgView.setBackgroundResource(R.drawable.gallery_unselected_default);
//current selected image
//always this code is working fine.
ImageView imgView = (ImageView)view.findViewById(R.id.adsimage);
        imgView.setBackgroundResource(R.drawable.gallery_selected_focused);
}