// This is an enumerable type, you can just add this like you would an inner class.
// Make sure you change this code a bit before you submit it, though it is from StackOverflow.

// Have Fun!

public enum BitmapManager {

		INSTANCE;

		private final Map<String, SoftReference<Bitmap>> cache;
		private final ExecutorService pool;
		private Map<ImageView, String> imageViews = Collections
				.synchronizedMap(new WeakHashMap<ImageView, String>());
		private Bitmap placeholder;

		BitmapManager() {
			cache = new HashMap<String, SoftReference<Bitmap>>();
			pool = Executors.newFixedThreadPool(5);
		}

		public void setPlaceholder(Bitmap bmp) {
			placeholder = bmp;
		}

		public Bitmap getBitmapFromCache(String url) {
			if (cache.containsKey(url)) {
				return cache.get(url).get();
			}

			return null;
		}

		public void queueJob(final String url, final ImageView imageView,
				final int width, final int height) {
			/* Create handler in UI thread. */
			final Handler handler = new Handler() {
				@Override
				public void handleMessage(Message msg) {
					String tag = imageViews.get(imageView);
					if (tag != null && tag.equals(url)) {
						if (msg.obj != null) {
							imageView.setImageBitmap((Bitmap) msg.obj);
						} else {
							imageView.setImageBitmap(placeholder);
							Log.d(null, "fail " + url);
						}
					}
				}
			};

			pool.submit(new Runnable() {
				@Override
				public void run() {
					final Bitmap bmp = downloadBitmap(url, width, height);
					Message message = Message.obtain();
					message.obj = bmp;
					Log.d(null, "Item downloaded: " + url);

					handler.sendMessage(message);
				}
			});
		}

		public void loadBitmap(final String url, final ImageView imageView,
				final int width, final int height) {
			imageViews.put(imageView, url);
			Bitmap bitmap = getBitmapFromCache(url);

			// check in UI thread, so no concurrency issues
			if (bitmap != null) {
				Log.i("Item Get", "Item loaded from cache: " + url);
				imageView.setImageBitmap(bitmap);
			} else {
				imageView.setImageBitmap(placeholder);
				queueJob(url, imageView, width, height);
			}
		}

		private Bitmap downloadBitmap(String url, int width, int height) {
			try {
				Bitmap bitmap = BitmapFactory
						.decodeStream((InputStream) new URL(url).getContent());
				bitmap = Bitmap.createScaledBitmap(bitmap, width, height, true);
				Log.w("Item Get", "Item downloaded from web: " + url);
				cache.put(url, new SoftReference<Bitmap>(bitmap));
				return bitmap;
			} catch (MalformedURLException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}

			return null;
		}
	}