Is it possible to use CloudKit Web Service
from Android native app? How will that authentication popup window appear in a native app if I want to let user able to modify records?
Can I put a button to the native app, that will open up browser and the redirected content will appear there, and when authentication successfull, specify a callback where token which uniquely identifies users, I guess user record name can be received?
Apple engineer talks about login from web here on this session video: https://developer.apple.com/videos/wwdc/2015/?id=704