AbsListView.LayoutParams param = new AbsListView.LayoutParams(
                                     android.view.ViewGroup.LayoutParams.MATCH_PARENT,
                                     parent.getWidth()/2+DpPx.dip2px(context,20));//-20 10spacing 5padding + 40 textview.height
            convertView.setLayoutParams(param);

    public static int dip2px(Context context, float dpValue) { 
        final float scale = context.getResources().getDisplayMetrics().density; 
        return (int) (dpValue * scale + 0.5f); 
    }