ViewPager 放PagerAdapter 的notifyDataSetChanged()

最近搞了一個查看圖片的viewpager ，裏面放的是pagerAdapter ，但是發現當刪除 某個頁面後調用notifyDataSetChanged() 界面沒發生變化，後來搞了搞，發現要這麼寫PagerAdapter ：
主要是destroyItem這個方法重寫寫錯了。。應該這樣：

 @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            View view = (View) object;
            container.removeView(view);
            view = null;
        }

完整的adapter 如下：

 class PhotoAdapter extends PagerAdapter {
        private int mChildCount = 0;

        @Override
        public int getCount() {
            if (viewList.size() > 0 && viewList != null) {
                return viewList.size();
            }
            return 0;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            container.addView(viewList.get(position));
            return viewList.get(position);
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {

         //   container.removeView(viewList.get(position));
            View view = (View) object;
            container.removeView(view);
            view = null;
        }

    }