Basic structure of AsyncTask Class

private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {

    protected Long doInBackground(URL... urls) {

        while (true) {

            // Do some work

            publishProgress((int) ((i / (float) count) * 100));

        }

       return result;

    }

    protected void onProgressUpdate(Integer... progress) {

        setProgressPercent(progress[0]);

    }

    protected void onPostExecute(Long result) {

        showDialog(“Result is “ + result);

    }

}

To execute,

new DownloadFilesTask().execute(url1, url2, url3);

To read more about async task refer android developer guide.