Unity读取windows和Android SDcard文件

全部都是路径惹的祸

读取 windows D: 盘下的  test.txt 文件，

编辑器里运行，console上可以查看：

windows上 路径  / 要写成 \\  写一个也不行,可能会被转义，反正也无法读取内容

  string windowsUrl = "file://D:\\test.txt";        WWW w = new WWW(windowsUrl);        yield return w;        if (w.isDone)        {            Debug.Log("读取 D:盘 test文件 ====  "+w.text);        }

Androud相关的各大论坛相关文章很多，但是说的都不太清楚，所以特此记录。

log中 我打印了 Unity里面的路径，Androd上需要注意的也是 路径上的统一：

Android上获取Api提供的路径：

   Log.e(TAG, "onCreate: packageName = " + this.getExternalCacheDir());        Log.e(TAG, "onCreate: packageName = " + this.getExternalFilesDir(""));                Log.e(TAG, "onCreate: packageName = " + this.getCacheDir());        Log.e(TAG, "onCreate: packageName = " + this.getPackageName());                Log.e(TAG, "onCreate: packageName = " + Environment.getDataDirectory());        Log.e(TAG, "onCreate: packageName = " + Environment.getDataDirectory().getAbsolutePath());                Log.e(TAG, "onCreate: packageName = " + Environment.getExternalStorageDirectory());

IO方式 加载sdcard上的图片资源

加载的  /storage/emulated/0/ProjectName/Image/avatar/20170523_164417.jpg,

  image = this.GetComponentInChildren<Image>();        Debug.Log("IO加载用时: image = this.GetComponent<Image> ==========  " + image);        Debug.Log("IO加载:  Application.dataPath "  + Application.dataPath );        // Application.dataPath /data/app/com.putao.ptx.core-1/base.apk        Debug.Log("IO加载:  Application.persistentDataPath " + Application.persistentDataPath);        // Application.persistentDataPath /storage/emulated/0/Android/data/com.putao.ptx.core/files         Debug.Log("IO加载:GameObject.Find" + GameObject.Find("Canvas/Avator").GetComponent<Image>());         // /data/user/0/com.putao.paichallenge/cache/20170524_130527.jpg        // path =======  "/storage/emulated/0/ProjectName/Image/avatar/20170523_164417.jpg"        FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);        fileStream.Seek(0, SeekOrigin.Begin);        //创建文件长度缓冲区        byte[] bytes = new byte[fileStream.Length];        //读取文件        fileStream.Read(bytes, 0, (int)fileStream.Length);        //释放文件读取流        fileStream.Close();        fileStream.Dispose();        fileStream = null;        //创建Texture        int width = 300;        int height = 372;        Texture2D texture = new Texture2D(width, height);        texture.LoadImage(bytes);        //创建Sprite             Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width,texture.height), new Vector2(0.5f, 0.5f));        image.sprite = sprite;

log上可以看出来  android上 getExternalFilesDir("") 和 Unity里面的Application.persistentDataPath是一致的

   /storage/emulated/0/Android/data/com.putao.ptx.core/files

WWW方式加载本地图片   

url=  "file://"+ "/storage/emulated/0/ProjectName/Image/avatar/20170523_164417.jpg"

根本不是加"jar:file://"。。。某些博主根本就不试试么，瞎写。

public void LoadByWWW(String path)    {        StartCoroutine(doLoadByWWW(path));    }    IEnumerator doLoadByWWW(String path)    {        string url = "file://" + "/storage/emulated/0/PaiChallenge/Image/avatar/20170523_164417.jpg";        Debug.Log("doLoadByWWW == url ==================   " + url);        WWW w = new WWW(url);        yield return w;        if (w.isDone)        {            Sprite sprite = Sprite.Create(w.texture, new Rect(0, 0, w.texture.width, w.texture.height), new Vector2(0.5f, 0.5f));            GameObject.Find("Canvas/Avator").GetComponent<Image>().sprite = sprite;        }

还有 就是权限问题的添加 ：Player settings -- Other settings -- write permission的设置 Sdcard。这个是在Unity编辑器里打包的情况。

如果导出到studio 里面的话，可自行修改Manifest文件。