on
  abstract fun onHorizontalAccuracyRadiusUpdated(vararg radius: Double, options: ValueAnimator.() -> Unit? = null)
Called whenever the horizontal accuracy radius is updated.
Parameters
radius
- supports multiple radius value to create more complex animations with intermediate points. Last radius value will always be the animator target for next animation. 
options
- if specified explicitly will apply current animator option to radius animation. Otherwise default animator options will be used.