code: private void initImageSize(TypedArray attrs) {
  		int index = R.styleable.ActionButton_image_size;
  		if (attrs.hasValue(index)) {
  			imageSize = attrs.getDimension(index, imageSize);
  			LOGGER.trace("Initialized Action Button image size: {}", getImageSize());
  		}
  	}
docs: Initializes the image size inside <b>Action Button</b>
  <p>
  Changing the default size of the image breaks the rules of
  <a href="http://www.google.com/design/spec/components/buttons.html">Material Design</a>
  
  @param attrs attributes of the XML tag that is inflating the view