I'm making a moodle app for my home university but I haven't found a way to launch the browser so that he first asks for the SSO-login (e.g. Shibboleth) and then passes the web service token as parameter back. (Like it is done with the official moodle app.)
I remarked that others had the same question, but it remains so far unanswered.
this is done via a custom URL scheme call moodlemobile://?token=XYZ....
You should inspect the app source code to check how is done, or this line of code: