Moves a custom "close drawer button" and changes its alpha according to the Navigation Drawer opening offset

AnimateDrawerCloseButton.java

    /**
     * Moves a custom "close drawer button" and changes its alpha according to the Navigation Drawer opening offset
     * @param offset Drawer opening offset
     */
    private void animateDrawerCloseButton(float offset) {
        imbtnCloseDrawerButton.setX(recyclerView.getX() + recyclerView.getWidth() + convertDpiToPixels(15));        // (15) Distance between the button and the Drawer
        offset *= 255;              // (255) Max alpha
        imbtnCloseDrawerButton.getDrawable().setAlpha((int) offset);
    }