by Juan Leyva.
Hi Lars,
if you install the Moodle Mobile additional features plugin: https://docs.moodle.org/en/Moodle_Mobile_additional_features and configure it to force login "Via a browser" you will be able to connect to your site using the Moodle auth method configured (Google SSO for example).
The Mobile app have to delegate the authentication in Moodle, we won't supporting authentication & authorization methods like Google SSO natively.
Juan