@Override
                public void onViewTranslate(@NonNull final ImageView imageView, final float v) {
                    //empty on purpose
                }
transforms an ImageView in a zoomable, pinchable ImageView. This method uses Loupe under the hood
@param activity activity where the view resides in
@param imageView imageView to make zoomable/pinchable
@param imageContainer container around the imageView. See loupe doc for details
@param onFlingUpDown optional: action to happen on fling down or fling up
@param onSingleTap optiona: action to happen on single tap. Note that this action is registered / exceuted for whole activity
main/src/main/java/cgeo/geocaching/utils/ImageUtils.java