android如何获取gridview项目大小

我想在我的应用程序中获取GridView项目大小。我只知道我可以在回调中获取项目大小：

private class GridViewItemSelectedListener implements OnItemSelectedListener {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position,
                long id) {
            // TODO Auto-generated method stub
            int viewh = view.getHeight();
            int vieww = view.getWidth();
            Log.d(TAG, view.getWidth() + "," + view.getHeight() + 
                    " > position:(" +view.getX() + " , " + view.getY() + ")");
        }
    }

我在onResume方法中触发了处理程序

@Override
protected void onResume() {
    Message msg = new Message();
    msg.what = UPDATE_GRIDVIEW;
    mHandler.sendMessage(msg);

    super.onResume();
}

---

我甚至试着调用GridView的方法getSelectedItem（）等等，但也做不到。你能给我一些建议吗？原因是什么？以及如何获取gridview项目大小？

我打算在活动中获取大小；获取大小后，我将根据GridView项目大小重置selectorView。谢谢

<GridView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:stretchMode="columnWidth" />

<GridView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:stretchMode="columnWidth" />

public class YourAdapter extends BaseAdapter {

   int rowsCount;

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {

       View itemView = convertView;
       if (itemView == null) {
           itemView = layoutInflater.inflate(R.layout.item_view, parent, false);            
           int height = parent.getHeight();
           if (height > 0) {
               LayoutParams layoutParams = itemView.getLayoutParams();
               layoutParams.height = (int) (height / rowsCount);
           } // for the 1st item parent.getHeight() is not calculated yet       
       }
   }