Facebook - Đăng xuất facebook

// include fbFacebookSdk.sdkInitialize(getApplicationContext());

// code logout

LoginManager.getInstance().logOut();

THAM KHẢO :

/**
 * Logout From Facebook 
 */
public static void callFacebookLogout(Context context) {
    Session session = Session.getActiveSession();
    if (session != null) {

        if (!session.isClosed()) {
            session.closeAndClearTokenInformation();
            //clear your preferences if saved
        }
    } else {

        session = new Session(context);
        Session.setActiveSession(session);

        session.closeAndClearTokenInformation();
            //clear your preferences if saved

    }

}