Android, Java, AsyncTask.

AsyncTask.java

public class MainActivity extends AppCompatActivity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        query = "sample query"
        URL searchUrl = NetworkUtils.buildUrl(query);
        new QueryTask().execute(searchUrl);
    }

    public class QueryTask extends AsyncTask<URL, Void, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected String doInBackground(URL... params) {
            URL searchUrl = params[0];
            String searchResults = null;
            try {
                searchResults = NetworkUtils.getResponseFromHttpUrl(searchUrl);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return searchResults;
        }

        @Override
        protected void onPostExecute(String searchResults) {
            if (searchResults != null && !searchResults.equals("")) {
                showData(searchResults);
            } else {
                showErrorMessage();
            }
        }
    }
}