一、添加權限

權限添加 ：Player settings -- Other settings -- write permission的設置 Sdcard。這個是在Unity編輯器裏打包的情況。

如果導出到studio 裏面的話，可自行修改Manifest文件。

二、兩種方式

IO方式 加載sdcard上的圖片資源

加載的 /storage/emulated/0/ProjectName/image.jpg,

image = this.GetComponentInChildren<Image>();  
  
      Debug.Log("IO加載用時: image = this.GetComponent<Image> ==========  " + image);  
  
      Debug.Log("IO加載:  Application.dataPath "  + Application.dataPath );  
      // Application.dataPath /data/app/com.putao.ptx.core-1/base.apk  
  
      Debug.Log("IO加載:  Application.persistentDataPath " + Application.persistentDataPath);  
      // Application.persistentDataPath /storage/emulated/0/Android/data/com.putao.ptx.core/files   
  
  
      Debug.Log("IO加載: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);  
      //創建文件長度緩沖區  
      byte[] bytes = new byte[fileStream.Length];  
      //讀取文件  
      fileStream.Read(bytes, 0, (int)fileStream.Length);  
      //釋放文件讀取流  
      fileStream.Close();  
      fileStream.Dispose();  
      fileStream = null;  
  
      //創建Texture  
      int width = 300;  
      int height = 372;  
      Texture2D texture = new Texture2D(width, height);  
      texture.LoadImage(bytes);  
  
  
      //創建Sprite       
      Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width,texture.height), new Vector2(0.5f, 0.5f));  
  
      image.sprite = sprite;  

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

WWW方式加載本地圖片

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;  
  
        }  

Unity讀取Android SDcard文件