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在安卓下无法获取StreamingAssets目录下所有目录和文件名，所以需要提前将文件名整理成一个文件filelist.txt。

1.用批处理命令将StreamingAssets下所有文件名输出到filelist.txt中

chcp 65001是使用UTF-8编码，否则中文是乱码。

@echo off
chcp 65001
dir /b /s /a-d > filelist.txt

2.将filelist.txt中绝对路径转换成相对路径

打开filelist.txt，去掉StreamingAssets

3.确何filelist.txt为UTF-8

4.复制StreamingAssets目录下所有文件到PersistentData

void Start () {CopySteamingAssetsFileToPersistentDataPath();
}void CopySteamingAssetsFileToPersistentDataPath()
{string listFile = Path.Combine(Application.streamingAssetsPath, "filelist.txt");WWW reader = new WWW(listFile);while (!reader.isDone) { }string textString = reader.text;Debug.Log(textString.Length);List<string> striparr = textString.Split(new string[] { "\r\n" }, StringSplitOptions.None).ToList();List<string> lines = striparr.Where(s => !string.IsNullOrEmpty(s)).ToList();for (int i = 0; i < lines.Count; i++){string srcfile = Path.Combine(Application.streamingAssetsPath, lines[i]);WWW reader1 = new WWW(srcfile);while (!reader1.isDone) { }string dstFile = Path.Combine(Application.persistentDataPath, lines[i]);//安卓的路径只能是/，反斜杠\无效dstFile = dstFile.Replace('\\','/');string dir = Path.GetDirectoryName(dstFile);if (!Directory.Exists(dir)){Directory.CreateDirectory(dir);Debug.Log(dstFile);}File.WriteAllBytes(dstFile, reader1.bytes);}
}

5.AssetBundle资源需要针对Android单独打包，与Windows的不通用。

 打包完将资源复制到StreamingAssets下

ROBOCOPY Android  ..\Assets\StreamingAssets\Android  /E

 加载AssetBundle

//存放AssetBundle的根目录名字private static string rootFolder = "Android";//本地资源路径public string AbPath{ get{string path =
#if UNITY_ANDROID && !UNITY_EDITORApplication.persistentDataPath + "/";
#elseApplication.streamingAssetsPath + "/";
#endifreturn string.Format("{0}{1}/", path, rootFolder);}}

AssetBundle assetBundle = AssetBundle.LoadFromFile(string.Format("{0}{1}", AbPath, rootFolder));
......