title: how to connect android application and openstack cloud?
body: <p>I have setup an openstack cloud and I am able to upload/download the files through browser (logging through "horizon" dashboard) of android device,  but i want to build an android app to directly connect to and transact with the cloud. 
  Is there any APIs? 
  Which method can i take? 
  Please revert back. Any solution would be helpful. Thank you in advance.</p>