Imageloader class creates lazylist folder in gallery. How to avoid it

I am using imageLoader class to load images from url. But those all images are storing in the gallery by a folder name called LazyList. It takes upto 40 -100 mb of memory. But I dont want to load that images since the users may feel discomfort. Sorry for the bad English.

All works fine but it creates a folder in the gallery and shows all the images that are using by my app. So I feel users will feel discomfort by my app.

Here is my code of imageloader and also it links with few other classes even

public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
        .synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;

public ImageLoader(Context context) {
    fileCache = new FileCache(context);
    executorService = Executors.newFixedThreadPool(5);
}

final int stub_id = R.drawable.abs__ab_bottom_transparent_light_holo;

public void DisplayImage(String url, ImageView imageView) {
    imageViews.put(imageView, url);
    Bitmap bitmap = memoryCache.get(url);
    if (bitmap != null)
        imageView.setImageBitmap(bitmap);
    else {
        queuePhoto(url, imageView);
        imageView.setImageResource(stub_id);
    }
}

private void queuePhoto(String url, ImageView imageView) {
    PhotoToLoad p = new PhotoToLoad(url, imageView);
    executorService.submit(new PhotosLoader(p));
}

private Bitmap getBitmap(String url) {
    File f = fileCache.getFile(url);
    // from SD cache
    Bitmap b = decodeFile(f);
    if (b != null)
        return b;
    // from web
    try {
        Bitmap bitmap = null;
        URL imageUrl = new URL(url);
        HttpURLConnection conn = (HttpURLConnection) imageUrl
                .openConnection();
        conn.setConnectTimeout(30000);
        conn.setReadTimeout(30000);
        conn.setInstanceFollowRedirects(true);
        InputStream is = conn.getInputStream();