InitialiseLineManager.kt

private val mapView: MapView by lazy { v.mapView }
private lateinit var lineManager: LineManager
private lateinit var map: MapboxMap

private val v: ActivityMainBinding by lazy {
    ActivityTsasBinding.inflate(layoutInflater)
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    Mapbox.getInstance(this)
    setContentView(v.root)

    mapView.onCreate(savedInstanceState)
    mapView.getMapAsync {
        map = it
        mapboxMap.setStyle(Style.OUTDOORS) {
          lineManager = LineManager(mapView, map, map.style!!)
        }
    }
}