How to update CursorLoader for a ListView in an Android Widget?

Question

I have a widget containing a ListView. The ListView displays the next 10 events in my calendar. I'm using CursorLoader to get events.
eventsUri = CalendarContract.Events.ContentUri;
loader = new AndroidX.Loader.Content.CursorLoader(context.ApplicationContext, eventsUri, eventsProjection, null, null, "dtstart ASC");

I get the following error if I try make a new loader in OnDataSetChanged() of RemoteViewsService.IRemoteViewsFactory :

Java.Lang.RuntimeException: 'Can't create handler inside thread Thread[Binder:25282_3,5,main] that has not called Looper.prepare()'

How do I update the CursorLoader so I can update the ListView?

Thanks.