Unity读取Android SDcard文件

一、添加权限

权限添加 ：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。

二、两种方式

IO方式 加载sdcard上的图片资源

加载的  /storage/emulated/0/ProjectName/image.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.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.jpg"

根本不是加"jar:file://..."

public void LoadByWWW(String path)
    {
        StartCoroutine(doLoadByWWW(path));  

    }  

    IEnumerator doLoadByWWW(String path)
    {
        string url = "file://" + "/storage/emulated/0/PaiChallenge/image.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;  

        }