Create an Oath login page for Android application

I would like to develop an Android SDK for my web app. The web app is done using PHP (symphony framework). The login page on the webapp is also not done (the OAUTH producer stuff). I have looked at the facebook Android SDK and would like to fashion my SDK to be just like that. After the login is done then I will need at least 2 methods done. The developer will also do the dummy PHP Rest method and create the corresponding method on the Android SDK