Question

嘿，有人能指出我在Android的Facebook教程的正确方向吗？他们的开发者网站的教程并不是那么好。

这是我到目前为止所提出的：

public static final int FBResultCode = 100;
private static Session.StatusCallback sharedFBStatusCallback = new Session.StatusCallback()
{
    @Override
    public void call(Session session, SessionState state, Exception exception)
    {
        if(exception != null)
            Log.e("fb error", exception.toString());
        switch(state)
        {
        case OPENED:
                            //login successful
            break;
        case CLOSED:
        case CLOSED_LOGIN_FAILED:
            closeFBSession();
            break;
        default:
            break;
        }
    }
};

public static void openFBSessionWithLoginUI(boolean loginUI)
{
    Session session = Session.getActiveSession();

    if (session != null && 
            !session.isOpened() && 
            !session.isClosed()) 
    {
        ArrayList<String> perms = new ArrayList<String>();
        perms.add("user_likes");
        perms.add("user_birthday");
        perms.add("read_friendlists");

        Session.OpenRequest openRequest = new Session.OpenRequest(rootActivity)
        .setCallback(sharedFBStatusCallback)
        .setDefaultAudience(SessionDefaultAudience.FRIENDS)
        .setLoginBehavior(loginUI? SessionLoginBehavior.SUPPRESS_SSO: SessionLoginBehavior.SSO_ONLY)
        .setRequestCode(FBResultCode)
        .setPermissions(perms);

        session.openForRead(openRequest);
    }
    else 
    {
        Session.openActiveSession(rootActivity, loginUI, sharedFBStatusCallback);
    }

}

private static void closeFBSession()
{
    Session currentSess = Session.getActiveSession();

    if(currentSess != null)
    {
        currentSess.closeAndClearTokenInformation();
    }
}

然而，这会返回错误：