public static ImageCache getInstance(            FragmentManager fragmentManager, ImageCacheParams cacheParams) {         // Search for, or create an instance of the non-UI RetainFragment        final RetainFragment mRetainFragment = findOrCreateRetainFragment(fragmentManager);         // See if we already have an ImageCache stored in RetainFragment        ImageCache imageCache = (ImageCache) mRetainFragment.getObject();         // No existing ImageCache, create one and store it in RetainFragment        if (imageCache == null) {            imageCache = new ImageCache(cacheParams);            mRetainFragment.setObject(imageCache);        }         return imageCache;    }

 /**     * A simple non-UI Fragment that stores a single Object and is retained over configuration     * changes. It will be used to retain the ImageCache object.     */    public static class RetainFragment extends Fragment {        private Object mObject;         /**         * Empty constructor as per the Fragment documentation         */        public RetainFragment() {}         @Override        public void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);             // Make sure this Fragment is retained over a configuration change            setRetainInstance(true);        }         /**         * Store a single object in this Fragment.         *         * @param object The object to store         */        public void setObject(Object object) {            mObject = object;        }         /**         * Get the stored object.         *         * @return The stored object         */        public Object getObject() {            return mObject;        }    }