code: private void initShadowRadius(TypedArray attrs) {
  		int index = R.styleable.ActionButton_shadow_radius;
  		if (attrs.hasValue(index)) {
  			shadowRadius = attrs.getDimension(index, shadowRadius);
  			LOGGER.trace("Initialized Action Button shadow radius: {}", getShadowRadius());
  		}
  	}
docs: Initializes the shadow radius
  
  @param attrs attributes of the XML tag that is inflating the view