BFacebookManager.java 文件源码

/** Re authenticate after session state changed.*/
public static Promise<Object, BError, Void> onSessionStateChange(Session session, SessionState state, Exception exception) {
    if (DEBUG) Timber.i("Session changed state");

    // If we can start the login process with no errors this promise wont be used. 
    // The returned promise will be from the loginWithFacebook.
    Deferred<Object, BError, Void> deferred = new DeferredObject<>();

    if (exception != null)
    {
        exception.printStackTrace();
        if (exception instanceof FacebookOperationCanceledException)
        {
            deferred.reject(new BError(BError.Code.EXCEPTION, exception));
            return deferred.promise();
        }
    }

    if (state.isOpened()) {
        if (DEBUG) Timber.i("Session is open.");

        // We will need this session later to make request.
        userFacebookAccessToken = Session.getActiveSession().getAccessToken();

        return loginWithFacebook();

    } else if (state.isClosed()) {
        // Logged out of Facebook
        if (DEBUG) Timber.i("Session is closed.");
        deferred.reject(new BError(BError.Code.SESSION_CLOSED, "Facebook session is closed."));
    }


    return deferred.promise();
}