Android中解决Viewpage调用notifyDataSetChanged()时界面无刷新的问题

class SearchAdapter extends PagerAdapter {

   private int mChildCount = 0;

   @Override
   public void notifyDataSetChanged() {     
      mChildCount = getCount();
      super.notifyDataSetChanged();
   }

   @Override
   public int getItemPosition(Object object)  {     
      if ( mChildCount > 0) {
      mChildCount --;
      return POSITION_NONE;
      }
      return super.getItemPosition(object);
   }

}