An android AsyncTask class to download image from url

it is easy to store web image to local sd card by using apaceh common io...

class initCatalogAsync extends AsyncTask<String, String, String>{
    @Override
        protected void onPreExecute() {
            showDialog(0);
        }
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
for(int i=0; i< videoList.size(); i++){
VideoObj vo= (VideoObj)videoList.get(i);

String thumbsUrl=GlobalConfig.YOUTUBE_THUMBS_URL+vo.getVid()+"/"+GlobalConfig.THUMBS_ID;

File f= new File(GlobalConfig.THUMBS_FOLDER+vo.getVid()+".jpg");
if(!f.exists()){
try {
if(GlobalConfig.DEBUG){
Log.w(TAG,thumbsUrl);
}
FileUtils.copyURLToFile(new URL(thumbsUrl),f);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return null;
}
@Override
        protected void onProgressUpdate(String... progress) {
            super.onProgressUpdate(progress);
         
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
         
            setListData();
            progressDialog.dismiss();

        }
    }