The answer to your question shows how to call the Google Play Services API to log in. To call the API from Python, you need to use a library called Pyjnius , which is mentioned in Kivy docs to wrap Android classes in a Python class.
You should be able to do something similar with the Facebook API after installing the Facebook SDK for Android . Some users have found problems integrating these SDKs into their Kivy projects with some discussions and solutions here .
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