小编rap*_*tor的帖子

我正在使用本课程的一个(稍加修改的)解决方法来获取userId,如果请求是从Android客户端发送的,则为null.

/**
 * This is an ugly workaround for null userId for Android clients.
 *
 * @param user A User object injected by the cloud endpoints.
 * @return the App Engine userId for the user.
 */
private static String getUserId(User user) {
    String userId = user.getUserId();
    if (userId == null) {
        LOG.info("userId is null, so trying to obtain it from the datastore.");
        AppEngineUser appEngineUser = new AppEngineUser(user);
        ofy().save().entity(appEngineUser).now();

        AppEngineUser savedUser = ofy().load().key(appEngineUser.getKey()).now();
        userId = savedUser.getUser().getUserId();
        LOG.info("Obtained the userId: …