在视图寻呼机中添加或删除项目时，应保留滚动

Question

我想在ViewPager中添加项目，并允许用户根据需要添加或删除视图。在视图寻呼机中添加或删除项目时，滚动问题就会出现。当在0索引处添加项目时，不应向下滚动查看寻呼机。

这是我的代码

private class StoryAdapter extends PagerAdapter {

    @Override
    public Object instantiateItem(ViewGroup container, final int position) {
        // TODO Auto-generated method stub

        Item item = lists.get(position);
        LayoutInflater inflater = getActivity().getLayoutInflater();

        final View viewItem = inflater.inflate(R.layout.custom_story, container, false);
            TextView title =  viewItem.findViewById(R.id.titlestory);
         TextView storytext =  viewItem.findViewById(R.id.storytext);
        ImageView storyImg = viewItem.findViewById(R.id.storyimg);

        title.setTypeface(C.getBlackToBlackFont(getActivity()));
         storytext.setTypeface(C.getRobotoRegularFont(getActivity()));

        title.setText(item.storyTitle);
        storytext.setText(item.storyDescription);
        PicassoCache.getPicassoInstance(getActivity()).load(item.storyImage).placeholder(R.drawable.dummyimage).error(R.drawable.dummyimage).fit().centerCrop().into(storyImg);
        ((ViewPager) container).addView(viewItem);
        return viewItem;
    }

    @Override
    public int getItemPosition(Object object) {
        return POSITION_NONE;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return lists.size();
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        // TODO Auto-generated method stub

        return view == ((View) object);
    }


    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        // TODO Auto-generated method stub
        ((ViewPager) container).removeView((View) object);
    }


}

XML：

<me.kaelaela.verticalviewpager.VerticalViewPager
    android:id="@+id/vertical_viewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/hd"
    />