title: How to implement Single Sign On on Android
body: <p>I would like to implement Single Sign On on Android.</p>
  
  <p>I have a set of mobile apps which need to speak with a server to identify the user. </p>
  
  <p>When one of the applications is recognised as belonging to the user, the other apps should be able to detect that, without asking the user for further identification.</p>
  
  <p>So basically the user will log in only one application and all other applications will follow automatically.</p>
  
  <p>Please how could I achieve that?</p>