Cast exception in UrlImageViewHelper library, while trying to cast BitmapDrawable

Question

I am using the UrlImageViewHelper lib developed by Koushik Dutta (Koush). Here is what I am doing

1. Load images from a url into imageview which are inside a gridview.
2. Image loading works perfectly and is quite fast.

I am trying to save the image loaded inside the imageview, as a wallpaper but it crashes and throws up a casting exception.

The code

UrlViewImageHelper.setURLDrawable(imageView,"some url here");
Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();

The above line throws this exception

02-26 06:54:07.987: E/AndroidRuntime(19659): java.lang.ClassCastException: com.koushikdutta.urlimageviewhelper.UrlImageViewHelper$ZombieDrawable

How do I get the image inside the imageView as a bitmap? What am I doing wrong?

I understand that I can use some other library such as Android Universal Image Loader (have not tried it yet),SmartImageView (good but slow), but koush's library is quite fast and simple to use.

Answer 1

URLViewImageHelper downloads the image in separate thread asynchronously, hence at the point you call imageView.getDrawable(), the image not loaded yet.

What u can try is to register a callback object to be notified when image finished loading:

UrlViewImageHelper.setURLDrawable(imageView,url, defaultResource, new UrlImageViewCallback() {
    @Override
    public void onLoaded(ImageView imageView, Bitmap loadedBitmap, String url, boolean loadedFromCache) {
        // your method here
        Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();

    }
}) ;