获得unity 资源中的MD5值，为资源更新配置文件做准备

[MenuItem("Tools/获得GUID")]
    public static void GetAssetsGuid()
    {
        Object obj = Selection.activeObject;
        string path = AssetDatabase.GetAssetPath(obj);
        Debug.Log(path);
        string str=  AssetDatabase.AssetPathToGUID(path);
        Debug.Log(str);
    }

   [MenuItem("Tools/设置GUID")]
    public static void SetAssetGUID()
    {
        CheckAssetBundleDir(GetAssetBundleStringPath());
    }

    public static string GetAssetBundleStringPath()  //得到存放打包资源的文件路径
    {
        string path = Application.streamingAssetsPath;
        //Debug.Log(path);
        string[] strs = path.Split(‘/‘);
        int idx = 0;
        for (int i = 0; i < strs.Length; i++)
        {
            if (strs[i] == "Assets")
                idx = i;
        }
        // Debug.Log(idx);
        //path = strs[strs.Length - 2] + "/" + strs[strs.Length - 1];
        string str = "";
        for (int i = idx; i < strs.Length; i++)
        {
            if (i != strs.Length - 1)
                str += strs[i] + "/";
            else if (i == strs.Length - 1)
                str += strs[i];
            //Debug.Log(i);
        }
        path = str;
        return path;
        //Debug.Log(path);
    }

    public static void CheckAssetBundleDir(string path)   //是文件，继续向下
    {
        DirectoryInfo directory = new DirectoryInfo(@path);
        FileSystemInfo[] fileSystemInfos = directory.GetFileSystemInfos();

        foreach (var item in fileSystemInfos)
        {
            // Debug.Log(item);
            int idx = item.ToString().LastIndexOf(@"\");
            string name = item.ToString().Substring(idx + 1);

            if (!name.Contains(".meta"))
            {
                CheckAssetBundleFileOrDirectory(item, path + "/" + name);  //item  文件系统，加相对路径
            }
        }
    }

    public static void CheckAssetBundleFileOrDirectory(FileSystemInfo fileSystemInfo, string path) //判断是文件还是文件夹
    {
        FileInfo fileInfo = fileSystemInfo as FileInfo;
        if (fileInfo != null)
        {
            //Debug.Log(path);
            Debug.Log("不为空==>>"+ GetGUID(path));
        }
        else
        {
            //Debug.Log("为空");
        }
    }

    public static string GetGUID(string path)
    {
        return AssetDatabase.AssetPathToGUID(path);
    }