Here's a link that might help:
https://docs.microsoft.com/en-us/skype-sdk/skypeuris/skypeuritutorial_androidapps
BTW: I've not researched this, so I hope it meets your needs.
Cheers, Stuart
Trying to push the limits of App Inventor! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.