single sign in android app

hi, i am using latest dolphin android app 

but can anyone get sign sign in done in that?

Mobile App does not allow new members to join.

You have to join on web browser first, then login mobile app.

i know mobile app does not allow sign in from app.

but can anyone customise it as i am looking for single sign in  for android app ?

great idea

There is a couple ways of doing this... I will respond to JOB request.