从android listview onscroll中删除项目

Question

我实现了一个无休止的滚动列表视图，一旦用户滚动到列表的末尾，我就会继续填充项目（我执行数据库查询）。如下

class EndlessScrollListener implements OnScrollListener{
   /*code*/
}

listView.setOnScrollListener(new EndlessScrollListener());

/* the adapter */
public class HighlightedFieldsViewAdapter extends ArrayAdapter<T> {
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      final BaseModel baseModel = objects.get(position);
      if (baseModel != null) {
        TextView uniqueIdView = (TextView) view.findViewById(R.id.row_child_unique_id);

        ImageView imageView = (ImageView) view.findViewById(R.id.thumbnail);
        try {
            setFields(String.valueOf(baseModel.getShortId()), uniqueIdView);
            assignThumbnail(baseModel, imageView);

            view.setOnClickListener(createClickListener(baseModel, activityToLaunch));
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
      }
      return view;
    }
}

/* assignThumbNail method */
protected void assignThumbnail(BaseModel model, ImageView imageView) {
    String current_photo_key = model.optString("current_photo_key");
    if (cancelPotentialDownload(current_photo_key, imageView)) {
        AssignThumbnailAsyncTask task = new AssignThumbnailAsyncTask(imageView, photoCaptureHelper);
        ThumbnailDrawable drawable = new ThumbnailDrawable(task);
        imageView.setImageDrawable(drawable);
        task.execute(current_photo_key);
    }
}

这在滚动时工作正常但在滚动一段时间后我得到一个java.lang.outOfMemory异常。我假设这个列表视图在添加了几千条记录之后变得太大了。

所以我的问题是，如何删除用户向上滚动的视线列表视图中出现的项目。