Android Image loader library with support for ETags, If-Modified-Since

Question

I've been using for some time Android Http Image Manager, and recently I switched over to Android Universal Image Loader

I'm afraid neither of them have support for verifying if local cache is up-to-date.

What I'm currently looking for is an Image Loader library with community support and support for checking remote changes via ETag and/or If-Modified-Since

Answer 1

Question is answered from Github AUIL issue tracker. Thank you NOSTRA

https://github.com/nostra13/Android-Universal-Image-Loader/issues/75

public class URLConnectionImageDownloader extends ImageDownloader {
    @Override
    public InputStream getStreamFromNetwork(URI imageUri) throws IOException {
        URLConnection conn = imageUri.toURL().openConnection();
        // check etag/last-modification-date/... params
        // if image was changed then we should delete cached image from memory cache and disc cache

        // Delete image from caches
        String uri = imageUri.toString();
        File imageFile = ImageLoader.getDiscCache().get(uri)
        if (imageFile.exists()) {
            imageFile.delete();
        }
        MemoryCacheAware<String, Bitmap memoryCache = ImageLoader.getMemoryCache();
        for (String cacheKey : memoryCache.keys()) {
            if (cacheKey.contains(uri) {
                memoryCache.remove(cacheKey);
            }
        }


        return new FlushedInputStream(new BufferedInputStream(conn.getInputStream()));
    }
}