In the olden days (API v1) I used to add views to maps, and tag the views 
with their ids (from my database). Then I could find them on the map via 
their tag.

Now in the v2 API there seems no way to add views. The closest I can see is 
to use groundoverlays. The documentation says they have an ID that I can 
fetch via getId().  But I can't find anywhere how to SET the id. The same 
applies to markers too.   

The reason for tagging markers/overlays is to be able to avoid adding them 
again if they are already on the map, and to have the option to remove them 
again later. I cannot keep individual assignments as I have thousands of 
markers that could be placed on the maps (I do database queries depending 
on the camera position and span etc) 

So how can I set the id of a marker or ground overlay when adding them to 
the map?

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