Xamarin Form Version 4.2
ArcGIS Runtime For Xamarin Version 100.6
The Runtime API doesn't support Google Maps basemap, as their licensing restricts it from being used like that.
However I believe once you go to Android 9, it's by default required to use HTTPS instead of HTTP sources, so check your URIs aren't using unsecured HTTP.
Also it's always good to check the load error on a layer and/or map to investigate why something isn't loading.
thanks, it works.
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