AysncTask更新progressbar

class MyAsyncTask extends AsyncTask<Void, Integer, Void>{
        @Override
        protected Void doInBackground(Void... params) {
            for(int i=0;i<100;i++){
                publishProgress(i);
                try {
                    Thread.sleep(300);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            return null;
        }
        
        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            pb.setProgress(values[0]);
        }
    }