thx to all 3 of you! my very little example is now working (is there a place 
to upload examples? it is nice to understand activities and places without 
MVP)

"placeController.getWhere()" is the essence that made it clear for me. thats 
the place the comparison uses with the place given to goTo, right?

But Jens how you implemented this.lastActivity in your Mapper? Probably i 
will change my code again. As i mentioned in some other thread, i had code 
looking like yours (one mapper and one main activity with control over many 
presenters).  You stated "Ok a Custom "CachingActivityMapper" was easy to 
implement and works but there is still a case I am not happy with..." With 
that you mean your special inside-mapper-caching? Please tell how this works 
(probably with saving activity in some global field?)
the loop way via filtered and cached mappers used for such simple use cases 
(just let a presenter/acivity be) still don't feels good.

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