Depending on what exactly are you trying to achieve, you could use various ways. Simplest is to just not draw the map. If you only show some locations, markers, or polygons without interaction this should be sufficient. If you want to have full functionality but not show the map tiles, you could use the

1. map.updateMap()

method instead of the map.draw() one. See https://github.com/tillnagel/unfolding/blob/master/examples/de/fhpotsdam/unfolding/examples/misc/SimpleNoMapApp.java for an example.