水平列表视图无法正确加载图像

Question

我的代码从listview项目中的url加载图像，如

    HorizontalListView listview = (HorizontalListView) view
            .findViewById(R.id.listview);
    HorizontalListViewAdapter horizontalListViewImageAdapter = new HorizontalListViewAdapter(
            getActivity(), allMovies, res);
    listview.setAdapter(horizontalListViewImageAdapter);

那些单元格在屏幕上可见，显示图像非常正确，但是当我滚动列表时，它会消失图像。一些图像变得不可见，直到我刷新片段，一旦片段刷新它就能很好地工作。

用于下载图像我在适配器类中使用ImageLoader。如果您了解此案，请提供帮助。感谢

这是适配器代码

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

    View vi = convertView;
    final ViewHolder holder;

    if (convertView == null) {

        vi = inflater.inflate(R.layout.horizontal_listviewitem, parent,
                false);

        holder = new ViewHolder();
        holder.image = (ImageView) vi.findViewById(R.id.horizontal_image);
        holder.progressBar = (CircularProgressBar) vi
                .findViewById(R.id.progress_bar_horizontal_item);

        vi.setTag(holder);
    } else
        holder = (ViewHolder) vi.getTag();

    if (data.size() <= 0) {
        // holder.price.setText("No Data Found");

    } else {
        productData = null;
        productData = (Movies) data.get(position);

        try {

            ImageLoader.getInstance().displayImage(
                    "http://" + ControllerConstants.IP_ADDRESS + ""
                            + productData.getThumbnail(), holder.image,
                    Utility.options, new ImageLoadingListener() {

                        @Override
                        public void onLoadingStarted(String arg0, View arg1) {
                            // TODO Auto-generated method stub
                            holder.progressBar.setIndeterminate(true);
                        }

                        @Override
                        public void onLoadingFailed(String arg0, View arg1,
                                FailReason arg2) {
                            // TODO Auto-generated method stub
                            holder.progressBar.setIndeterminate(false);
                        }

                        @Override
                        public void onLoadingComplete(String arg0,
                                View arg1, Bitmap arg2) {
                            // TODO Auto-generated method stub
                            holder.progressBar.setIndeterminate(false);
                        }

                        @Override
                        public void onLoadingCancelled(String arg0,
                                View arg1) {
                            // TODO Auto-generated method stub
                            holder.progressBar.setIndeterminate(false);
                        }
                    });

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }

    }
    return vi;
}