Konstantin,
The error "Unable to resolve target 'android-19' until the SDK is loaded." is telling you that the Android API version 19 isn't available. Please go back and install API version 19.
The documentation mentions 10, 15 and 17 as being required but I found I also needed 18 (for the GIS integration) and 19 for the base client using the latest client framework.
After installing the API try again as that will clear up a lot of the errors you are seeing. Also when importing I make sure I don't copy the projects into my workspace as they have some pathing dependencies that might get messed up.
--Bill