Hi,
Please can you explain how you have generated the shp/dbf files that you have in your samples i.e. https://github.com/syncfusion/xamarin-demos/tree/master/Forms/Maps/Maps.Android/Assets? I have installed QGIS however it complains that it isn't a valid file for import.
I am trying to create a Australia and New Zealand combined dbf and shp file for use on my SfMaps projects as the existing australia.shp file does not include New Zealand.