AnsweredAssumed Answered

When is it not safe to call MapView.getScale() and MapView.GetVisibleArea()?

Question asked by Crittermap on Sep 21, 2018
Latest reply on Nov 5, 2018 by Crittermap

We get some crash reports sometimes that we don't quite understand.

I understand that there are times when the MapView is not ready to return information like Scale and VisibleArea.


But how do I tell when it is safe? Crashing isn't very user friendly. 


Example 1:

com.esri.arcgisruntime.internal.jni.CoreMapView.nativeGetScale (SourceFile)
com.esri.arcgisruntime.internal.jni.CoreMapView.q (SourceFile:233)
com.esri.arcgisruntime.internal.h.b.o.m (SourceFile:224)
com.esri.arcgisruntime.mapping.view.MapView.getMapScale (SourceFile:295)
....HomeActivity.updateZoomLevelText (
...HomeActivity.access$000 (
...HomeActivity$1.mapScaleChanged (
com.esri.arcgisruntime.internal.h.b.n$ (SourceFile:58)



Sure there are times when the scale can't be read. But I don't think one of those times should be when you just called us to tell us the scale changed. That seems like a time when we can get a scale and update the zoomlevel. But nope, it crashes. Not all the time, but some of the time. 

A bit ridiculous?


Is there some method available like boolean MapView isItSafetoAskforScale() ?


Because the only other alternative I can think of is to handle an exception every time we call MapView.getMapScale().

Or just let it crash.