IArStateObserver

interface IArStateObserver

This class provides ability to handle ArState changes.

abstract val arStateObservingSubject: PublishSubject<ArStateChangeRegistrar>

RxJava2 PublishSubject, subscribing to which you will get ArState changes events, as alternative to callbacks. It is safer to use CompositeDisposable for this.

addArStateListener	`abstract fun addArStateListener(listener: IArStateListener): Boolean` Add listener for ArState. removeArStateListener should be called when activity/fragment is destroyed.
getCurrentArState	`abstract fun getCurrentArState(): ArState` Get current AR state.
removeArStateListener	`abstract fun removeArStateListener(listener: IArStateListener): Boolean` Remove listener for ArState.

interface IBearHandler : IArStateObserver, IFlashStatusHandler

This class provides ability to handle BEAR SDK features.