LruCache-based BitmapCache for Volley

BitmapCache.java

package com.gae9.android.util;

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

import com.android.volley.toolbox.ImageLoader.ImageCache;

public class BitmapCache implements ImageCache {
    
	private LruCache<String, Bitmap> mMemoryCache;
	
	private static int getBitmapByteCount(Bitmap bitmap) {
		return bitmap.getRowBytes() * bitmap.getHeight();
	}
	 
    public BitmapCache(int maxMemoryCacheSizeInBytes) {
        mMemoryCache = new LruCache<String, Bitmap>(maxMemoryCacheSizeInBytes) {
        	protected int sizeOf(String key, Bitmap value) {
        		return getBitmapByteCount(value);
        	}
        };
    }
 
    public Bitmap getBitmap(String url) {
    	return mMemoryCache.get(url);
    }
 
    public void putBitmap(String url, Bitmap bitmap) {
        mMemoryCache.put(url, bitmap);
    }
    
    private static long getHeapSize() {
        return Runtime.getRuntime().maxMemory();
    }
    
    public static int detectCacheSize() {
    	final float DEFAULT_MEMORY_CACHE_HEAP_RATIO = 1f / 8f;
    	final float MAX_MEMORY_CACHE_HEAP_RATIO = 0.75f;
    	final float percentageOfHeap = DEFAULT_MEMORY_CACHE_HEAP_RATIO;
    	int size = Math
                .round(getHeapSize() * Math.min(percentageOfHeap, MAX_MEMORY_CACHE_HEAP_RATIO));
    	return size;
    }

}