add
open fun addOverlayViewProviderObserver(@NonNull overlayViewProviderObserver: OverlayViewProvider.OverlayViewProviderObserver)
Register a OverlayViewProviderObserver to be notified of changes of provided views. This observer is notified whenever notifyOverlayViewsChanged is called. If the observer has been registered previously, a call to this method is a no-op.
Parameters
overlay
An observer to be notified of changes whe notifyOverlayViewsChanged is called.