MapboxNavigationObserver

class MyViewModel : ViewModel() {
  private val locationObserver = MyLocationObserver()

  val location: LiveData<Location> = locationObserver.location.asLiveData()

  init {
    MapboxNavigationApp.register(locationObserver)
  }

  override fun onCleared() {
    MapboxNavigationApp.unregister(locationObserver)
  }
}

class MyLocationObserver : MapboxNavigationObserver {
  private val mutableLocation = MutableStateFlow<LocationMatcherResult?>(null)
  val locationFlow: Flow<LocationMatcherResult?> = mutableLocation

  private val locationObserver = object : LocationObserver {
    override fun onNewLocationMatcherResult(locationMatcherResult: LocationMatcherResult) {
      mutableLocation.value = locationMatcherResult
    }

    override fun onNewRawLocation(rawLocation: Location) {
      // no op
    }
  }

  override fun onAttached(mapboxNavigation: MapboxNavigation) {
    mapboxNavigation.registerLocationObserver(locationObserver)
  }

  override fun onDetached(mapboxNavigation: MapboxNavigation) {
    mapboxNavigation.unregisterLocationObserver(locationObserver)
  }
}