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

1.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

2.WWW方式加载本地图片
url= “file://”+ “/storage/emulated/0/ProjectName/image.jpg”

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; 
   
        }