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override fun onCreate(savedInstanceState: Bundle?) { 
    super.onCreate(savedInstanceState) 
    setContentView(R.layout.activity_main) 
 
    // authentication with an API key or named user is required to access basemaps and other 
    // location services 
    ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY) 
 
    // create a map with a topographic basemap 
    val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC) 
 
    // set the map to be displayed in the layout's map view 
    mapView.map = map 
 
    // set an initial viewpoint on the map view 
    mapView.setViewpoint(Viewpoint(34.056295, -117.195800, 100000.0)) 
 
    mapView.onTouchListener = object : DefaultMapViewOnTouchListener(this, mapView) { 
 
      override fun onSingleTapConfirmed(motionEvent: MotionEvent): Boolean { 
        // get the point that was tapped on the screen 
        val screenPoint = 
          android.graphics.Point(motionEvent.x.roundToInt(), motionEvent.y.roundToInt()) 
        // create a map point from that screen point 
        val mapPoint = mapView.screenToLocation(screenPoint) 
        // convert the point to WGS84 for obtaining lat/lon format 
        val wgs84Point = GeometryEngine.project(mapPoint, SpatialReferences.getWgs84()) as Point 
        // create a textview for the callout 
        val calloutContent = TextView(applicationContext).apply { 
          setTextColor(Color.BLACK) 
          setSingleLine() 
          // format coordinates to 4 decimal places and display lat long read out 
          text = getString(R.string.callout_text, wgs84Point.y, wgs84Point.x) 
        } 
 
        // get the callout, set its content and show it and the tapped location 
        mapView.callout.apply { 
          location = mapPoint 
          content = calloutContent 
          show() 
        } 
 
        // center the map on the tapped location 
        mapView.setViewpointCenterAsync(mapPoint) 
 
        return true 
      } 
    } 
  } 
 
  override fun onResume() { 
    super.onResume() 
    mapView.resume() 
  } 
 
  override fun onPause() { 
    mapView.pause() 
    super.onPause() 
  } 
 
  override fun onDestroy() { 
    mapView.dispose() 
    super.onDestroy() 
  } 
}