Android: Image cache strategy and memory cache size

Question

I\'m implementing an image cache system for caching downloaded image.

My strategy is based upon two-level cache: Memory-level and disk-level.

My class is very si

Answer 1

I've been looking into different caching mechanisms for my scaled bitmaps, both memory and disk cache examples. The examples where to complex for my needs, so I ended up making my own bitmap memory cache using LruCache. You can look at a working code-example here or use this code:

Memory Cache:

public class Cache {
    private static LruCache bitmaps = new BitmapLruCache();

    public static Bitmap get(int drawableId){
        Bitmap bitmap = bitmaps.get(drawableId);
        if(bitmap != null){
            return bitmap;  
        } else {
            bitmap = SpriteUtil.createScaledBitmap(drawableId);
            bitmaps.put(drawableId, bitmap);
            return bitmap;
        }
    }
}

BitmapLruCache:

public class BitmapLruCache extends LruCache {
    private final static int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
    private final static int cacheSize = maxMemory / 2;

    public BitmapLruCache() {
        super(cacheSize);
    }

    @Override
    protected int sizeOf(Integer key, Bitmap bitmap) {
        // The cache size will be measured in kilobytes rather than number of items.
        return bitmap.getRowBytes() * bitmap.getHeight() / 1024;
    }
}