How to pass string from AssyncTask to method?

Question

Java

Good day everyone :)
In an android application using the Tabbed activity template, I added code in the model for searching in Google, which requires asynchronous execution

public class PageViewModel extends ViewModel {

    private MutableLiveData<Integer> mIndex = new MutableLiveData<>();
    private LiveData<String> mText = Transformations.map(mIndex, new Function<Integer, String>() {
        @Override
        public String apply(Integer input) {
           
           new AsyncSearch().execute("Поисковое слово", "10");
            return ; // что возвратить???
        }
    });

    class AsyncSearch extends AsyncTask<String, Integer, String> {

        @Override
        protected String doInBackground(String... arg) {

            try {
                return GoogleSearchJava.Search(arg[0], arg[1]);

            } catch (IOException e) {
                e.printStackTrace();
                return e.getMessage() + "\n" + e.getStackTrace();
            }
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //что здесь написать???
        }
    }
}

How to get string from onPostExecute() to apply()?

GoogleSearchJava

public class GoogleSearchJava {

    public static final String GOOGLE_SEARCH_URL = "https://www.google.com/search";

    public static String Search(String searchTerm, String num) throws IOException {

        String searchURL = GOOGLE_SEARCH_URL + "?q=" + searchTerm + "&num=" + num;
        //without proper User-Agent, we will get 403 error
        Document doc = Jsoup.connect(searchURL).userAgent("Mozilla/5.0").get();

        //below will print HTML data, save it to a file and open in browser to compare
        //System.out.println(doc.html());

        //If google search results HTML change the <h3 class="r" to <h3 class="r1"
        //we need to change below accordingly
        Elements results = doc.select("h3.r > a");
        StringBuilder builder = new StringBuilder();
        for (Element result : results) {
            String linkHref = result.attr("href");
            String linkText = result.text();
            builder.append(linkHref + "\n" + linkText);
            System.out.println("Text::" + linkText + ", URL::" + linkHref.substring(6, linkHref.indexOf("&")));
        }
        return builder.toString();
    }

Answer 1

What a poor API this thing has...
You need to write a custom LiveData that will go to the search, and also use switchMap instead of map.
Here it is available described.
And you don't have to use asynctasks to go online...