Exception when trying to get targetGeometry from a viewpoint

MichaelKrutoyarskiy — Tue, 18 May 2021 15:23:21 GMT

I am getting a crash trying to get the targetGeometry inside the body of a addViewpointChangedListener.

The crash happens inconsistently but often, looks like a race condition when the map has just been created and the first viewpoint update is somehow not ready to provide the current viewpoint.

Reproduced using arcgis-android version 100.10.0 and 100.11.0 but not 100.6.0.

To reproduce add the viewpoint changed listener to the default 'present map' sample project and try to restart the app a few times:

ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY") val map = ArcGISMap(BasemapStyle.ARCGIS_NAVIGATION) mapView.map = map mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 72000.0)) mapView.addViewpointChangedListener { event -> event.source.getCurrentViewpoint(Viewpoint.Type.CENTER_AND_SCALE)?.let { viewpoint -> (viewpoint.targetGeometry as? Point)?.let { Log.d(TAG, "viewpoint update. Location: ${(GeometryEngine.project(it, SpatialReferences.getWgs84()) as Point)}") } } }

Stacktrace of the exception:

E/AndroidRuntime: FATAL EXCEPTION: main Process: me.oriient.arcgisplayground, PID: 14075 com.esri.arcgisruntime.ArcGISRuntimeException: Nullability violation: ArcGIS Runtime: 1 Null pointer. object cannot be null. at com.esri.arcgisruntime.internal.jni.CoreViewpoint.nativeGetTargetGeometry(Native Method) at com.esri.arcgisruntime.internal.jni.CoreViewpoint.f(SourceFile:1) at com.esri.arcgisruntime.mapping.Viewpoint.getTargetGeometry(SourceFile:2) at me.oriient.arcgisplayground.MainActivity$setupMap$1.viewpointChanged(MainActivity.kt:39) at com.esri.arcgisruntime.a.i.f.j0$a.run(SourceFile:1) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:6986) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1445)

Re: Exception when trying to get targetGeometry from a viewpoint

MichaelKrutoyarskiy — Mon, 24 May 2021 12:34:01 GMT

I've found a way to validate if the viewpoint is ready to be processed.

if (viewpoint.type == com.esri.arcgisruntime.mapping.Viewpoint.Type.UNKNOWN) { return }

Using this simple check we can ignore the viewpoints which will cause a crash another way.

topic Exception when trying to get targetGeometry from a viewpoint in ArcGIS Runtime SDK for Android Questions

Exception when trying to get targetGeometry from a viewpoint

Re: Exception when trying to get targetGeometry from a viewpoint