I guess the title says it all. I tried:
imageLoader.getMemoryCache().get(key);
with the image uri as key, but it always return null
null
Use MemoryCacheUtils.
MemoryCacheUtils
MemoryCacheUtils.findCachedBitmapsForImageUri(imageUri, ImageLoader.getInstance().getMemoryCache());
Memory cache can contain several bitmaps (diffenrent sizes) for one image. So memory cache use special keys, not image urls.