hello and thank you so much in helping me trying to find the problem.

i digged around on the internet and there are many with that problem and even as many solutions.
i have tried to implement the solutions i have found. The last two things that might be the problem is SSL connection because Google uses these,
and some proxy notification from the android os.
The odd thing is that i got now a report on the google play store from another galaxy note user where it is showing a white screen too. And i have one myself where it works. So maybe really a difference with the internet connection?
Has someone tried it when the phone is connected to a Wlan or with the mobile internet connection?
I have already started to try it with the native google maps api again.
But i failed the last time because the smartwatch does not use an activity and the MapView needs the MapActivity. It might be necessary to keep the google maps view on the phone screen opened to catch the images to send them to the smartwatch like i think the VFinder app does it to catch the camera image.
So if this last try does still not work i am again without a clue and will continue to try to convert it to the native maps api.
So here is the last try i think:
http://bytewiese.de/fileadmin/_media/dl/smartwatch/SmartwatchMap15.apk
Thanks to everyone