Unity开发时使用的多平台的读取流式资源StreamingAssets文件夹路径读取，当平台为安卓时，读取根目录/StreamingAssets/包名 所在的文件夹。

public static string path()
    {
        string path;
#if UNITY_EDITOR || UNITY_STANDALONE_WIN
        path = Application.streamingAssetsPath;
#else
        path = "/storage/emulated/0/StreamingAssets/"+Application.identifier;
#endif
        DirectoryCheck(path+"/");
        return path + "/";
    }
/// <summary>
    /// 检查路径是否存在
    /// </summary>
    /// <param name="path"></param>
    public static void DirectoryCheck(string path)
    {
        if (!Directory.Exists(path))
        {
            Directory.CreateDirectory(path);
        }
    }