Android Volley ImageLoader - BitmapLruCache parameter?

I am having trouble implementing Image cache using the new Volley library. In the presentation, code look like this

mRequestQueue = Volley.newRequestQueue(context);
mImageLoader = new ImageLoader(mRequestQueue, new BitmapLruCache());

The BitmapLruCache is obviously not included in the toolkit. Any idea how to implement it or point me to some resources?

http://www.youtube.com/watch?v=yhv8l9F44qo @14:38

Thanks!

import android.graphics.Bitmap;
import android.support.v4.util.LruCache;

public class BitmapLruCache extends LruCache<String, Bitmap> implements ImageCache {
    public static int getDefaultLruCacheSize() {
        final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
        final int cacheSize = maxMemory / 8;

        return cacheSize;
    }

    public BitmapLruCache() {
        this(getDefaultLruCacheSize());
    }

    public BitmapLruCache(int sizeInKiloBytes) {
        super(sizeInKiloBytes);
    }

    @Override
    protected int sizeOf(String key, Bitmap value) {
        return value.getRowBytes() * value.getHeight() / 1024;
    }

    @Override
    public Bitmap getBitmap(String url) {
        return get(url);
    }

    @Override
    public void putBitmap(String url, Bitmap bitmap) {
        put(url, bitmap);
    }
}

Ficus provides this sample code for the Bitmap LRU:

https://gist.github.com/ficusk/5614325

Here is an example of using a Disk based LRU cache with Volley. It is based on using a version of AOSP's DiskLruCache maintained by Jake Wharton. http://blogs.captechconsulting.com/blog/raymond-robinson/google-io-2013-volley-image-cache-tutorial

Edit: I have updated the project to include an in-memory LRU cache as the default implementation as this is the recommended method. Volley implicitly handles disk based cache in its own L2 cache. The image cache is just the L1 cache. I updated the original post and added some more detail here: http://www.thekeyconsultant.com/2013/06/update-volley-image-cache.html.