@Override
protected Document doInBackground(String... urls) {
    try {
        return Jsoup.connect(urls[0]).get();
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

@Override
protected void onPostExecute(Document document) {
    if (document != null) {
        Elements imgElements = document.select("img");
        List<String> images = new ArrayList<>();

        for (Element element : imgElements) {
            String image = element.attr("data-src");
            Log.d("IMAGE_URL", image);
            images.add(image);
        }

    }
}