IEnumerator SaveAdsImg(string wwwPath, string path, Image img)
{
WWW www = new WWW(wwwPath);
yield return www;
if (www.error == null)
{
if (!WebFileExists(path))
{
// Create a texture in DXT1 format
Texture2D texture = new Texture2D(www.texture.width, www.texture.height, TextureFormat.RGB24, false) as Texture2D;
// assign the downloaded image to sprite
www.LoadImageIntoTexture(texture);
Rect rec = new Rect(0, 0, texture.width, texture.height);
Sprite itemBGSprite = Sprite.Create(texture, rec, new Vector2(0.5f, 0.5f), 100);
if (img != null)
img.sprite = itemBGSprite;
Texture2D itemBGTex = itemBGSprite.texture;
byte[] itemBGBytes = itemBGTex.EncodeToPNG();
File.WriteAllBytes(path, itemBGBytes);
www.Dispose();
www = null;
}
else
{
// Create a texture in DXT1 format
Texture2D texture = new Texture2D(www.texture.width, www.texture.height, TextureFormat.RGB24, false) as Texture2D;
// assign the downloaded image to sprite
www.LoadImageIntoTexture(texture);
Rect rec = new Rect(0, 0, texture.width, texture.height);
Sprite itemBGSprite = Sprite.Create(texture, rec, new Vector2(0.5f, 0.5f), 100);
if (img != null)
img.sprite = itemBGSprite;

}
}
}

StartCoroutine(SaveAdsImg(lstAlbums[i].Anh, path, objSlide.GetComponent<Image>()));

string dirPath = @Application.persistentDataPath + "/BundleImgs/";
string path = dirPath + getImgName(Anh);

static public bool WebFileExists(string uri)
{
long fileLength = -1;
WebRequest request = HttpWebRequest.Create(uri);
request.Method = "HEAD";
WebResponse resp = null;
try
{
resp = request.GetResponse();
}
catch
{
resp = null;
}
if (resp != null)
{
long.TryParse(resp.Headers.Get("Content-Length"), out fileLength);
}
return fileLength > 0;
}

string getImgName(string url)
{
Debug.Log("url:" + url);
string tmp = url.Substring(url.LastIndexOf("/") + 1, url.Length - url.LastIndexOf("/") - 1);
Debug.Log("name tmp:" + tmp);
if (tmp.Length < 3)
Debug.Log(" ten qua ngan" + url);
return tmp;
}