code: private Animator preparePressedAnimation() {
          Animator animation = ObjectAnimator.ofFloat(drawable, CircularProgressDrawable.CIRCLE_SCALE_PROPERTY,
                  drawable.getCircleScale(), 0.65f);
          animation.setDuration(120);
          return animation;
      }
docs: This animation was intended to keep a pressed state of the Drawable
  
  @return Animation