ArcGIS Maps SDK For Kotlin 加载Layout中的MapView出错

作为初学者，由原来ArcGIS android runtime 10.2.X转过来，不太适应kotlin的写法。出现了

kotlin.uninitializedpropertyaccessexception: lateinit property lifeCycleOwner has not been initialized的错误。

     private lateinit var mMapView: MapView
     override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
         ArcGISEnvironment.apiKey = ApiKey.create("你的APIKey")
         try {
             setContentView(R.layout.activity_main)
             mMapView = findViewById(R.id.mMapView);
             mMapView.onCreate(this) //这句最关键
             val arcgisMap = ArcGISMap(BasemapStyle.ArcGISTopographic)
             arcgisMap.initialViewpoint = Viewpoint(latitude = 34.0270, longitude = -118.8050, scale = 72000.0)
             mMapView.map = arcgisMap
         } catch (ex:Exception) {
             ex.message.toString()
         }
    }

加一句就解决了问题。

mMapView.onCreate(this)