code: private void initButtonColor(TypedArray attrs) {
  		int index = R.styleable.ActionButton_button_color;
  		if (attrs.hasValue(index)) {
  			buttonColor = attrs.getColor(index, buttonColor);
  			LOGGER.trace("Initialized Action Button color: {}", getButtonColor());
  		}
  	}
docs: Initializes the <b>Action Button</b> color for the {@link State#NORMAL}
  {@link #state}
  
  @param attrs attributes of the XML tag that is inflating the view