code: private void initButtonColorPressed(TypedArray attrs) {
  		int index = R.styleable.ActionButton_button_colorPressed;
  		if (attrs.hasValue(index)) {
  			buttonColorPressed = attrs.getColor(index, buttonColorPressed);
  			buttonColorRipple = darkenButtonColorPressed();
  			LOGGER.trace("Initialized Action Button color pressed: {}", getButtonColorPressed());
  		}
  	}
docs: Initializes the <b>Action Button</b> color for the {@link State#PRESSED}
  {@link #state}
  <p>
  Initialized the <b>Action Button</b> default Ripple Effect color
  <p>
  Must be called before {@link #initButtonColorRipple(TypedArray)} for proper
  {@link #buttonColorRipple} initialization
  
  @param attrs attributes of the XML tag that is inflating the view