Facebook Android SDK login

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Facebook Android SDK API provides single sign on (SSO), that means if has logged through Facebook app session, so you needn't sign in Facebook every time.

_fbAPI.authorize(this, new String[] { "email" }, Facebook.FORCE_DIALOG_AUTH, new DialogListener() );

It will pop-up Facebook sign in dialog every time, but it may disturb users and they could not like this way.

http://stackoverflow.com/questions/8795985/how-logout-works-in-facebook-sdk-android
http://stackoverflow.com/questions/7679875/is-there-a-way-to-log-out-via-facebook-api-on-android-if-you-have-the-facebook-a


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