无法使用SimpleAdapter，ViewBinder和Asynctask从ListView将图像设置为ImageView

Question

I have a problem. I'm trying to retrieve an image from a online source and the set the image into the ListView 's ImageView . However, I can't do that because I can't link my ImageView within the ListView as it returns a NullPointerException . I realise that I have to use VieWBinder to set the image into the ImageView within the ListView .
Currently, I'm using the ImageLoader class from here as well as the ViewBinder class from here .
This is my ViewBinder Class:

SearchResults sr = new SearchResults();
ImageDownloader imageDownloader = new ImageDownloader();

@Override
public boolean setViewValue(View view, Object data, String textRepresentation) {
    if (view instanceof ImageView && data instanceof Bitmap) {
    // TODO Auto-generated method stub
        for (int i = 0; i < sr.listData.size(); i++) {
            String imageISBN = sr.listData.get(i).get("coverImage");
            ImageView iv = (ImageView) view;
            Bitmap bm = (Bitmap) data;
            imageDownloader.download(imageISBN,iv);
            //iv.setImageBitmap(bm);
            return true;
        }
    }
    return false;
}

SearchResults is a class where I got the listData from which contains data like the url to the images. How can I do use the ImageLoader class to insert the downloaded image into the ImageView within the ListView using ViewBinder ?

*Side Note: It would give me an error "05-12 13:16:37.195: INFO/System.out(736): resolveUri failed on bad bitmap uri: http://lib.syndetics.com/index.aspx?isbn=9780137081851/SC.GIF&client=tpoly&type=xw12 " as well *

Answer 1

Set tag for the image view say for instance the URL of the image. And in your onPostExecute fetch the image view by list view.findViewByTag. I don't agree using asynctask for fetching images as there would be many asynctask if your list view is having lot of list items.