code: private void initShadowColor(TypedArray attrs) {
  		int index = R.styleable.ActionButton_shadow_color;
  		if (attrs.hasValue(index)) {
  			shadowColor = attrs.getColor(index, shadowColor);
  			LOGGER.trace("Initialized Action Button shadow color: {}", getShadowColor());
  		}
  	}
docs: Initializes the shadow color
  
  @param attrs attributes of the XML tag that is inflating the view