Q:

How to add multiple TileOverlayOptions to a GoogleMap?

I am trying to add multiple custom tile providers to a Google map via GoogleMap.addTileOverlay() as described in the Google documentation.
When I only add one of them - each of them work.
When I add all at once nothing is shown.

A:

The problem occured because some members for the multiple instances of my custom UrlTileProvider where declared static. 

