Unity - A计划（永久有效期） 扫二维码继续学习 二维码时效为半小时

public static XmlNode LoadXmlFile(string xmlPath)//加载XML步骤文件
    {
        XmlDocument xml = new XmlDocument();     
        if (Application.platform == RuntimePlatform.Android)
        {
            localPath = Application.streamingAssetsPath + "/" + xmlPath + ".xml";
            Debug.Log(localPath);
           
           
        }
        else
        {
            //TextAsset textAsset = (TextAsset)Resources.Load(xmlPath, typeof(TextAsset));
            //using (MemoryStream stream = new MemoryStream(textAsset.bytes))
            //{
            //    xml.Load(stream);
            //}     
            localPath = "file://" + UnityEngine.Application.streamingAssetsPath + "/" + xmlPath + ".xml";
            Debug.Log("woshiwebgl");

        }
        WWW www = new WWW(localPath);
        while (!www.isDone)
        {

        }
        xml.LoadXml(www.text); 
        string[] currentPath = xmlPath.Split('/');
        string[] singleNode = currentPath[currentPath.Length - 1].Split('.');
        Debug.Log(singleNode[0]);
        XmlNode xmlNode = xml.SelectSingleNode(singleNode[0]);
        return xmlNode;
    }

在网上找到教程。可以在编辑器运行成功，发布安卓后则读取不到。老师能给一下可以读取成功的代码或者是测试可行的教程链接吗？万分感谢