Android application with OAuth2 authentication
a fancy feature of this application is automatically refresh token if 'access_token' is expired
for Authorization Server and Resource Server example you can find at this repository
https://github.com/singamasae/server-app
temporary Auth & resource server for testing at
http://restapi-projectlatte.rhcloud.com
username = admin
password = 123456
client id = clientapp
client secret = 123456