MainActivity.java

    private class OdjazdQueryTask extends AsyncTask<URL, Void, String> {
        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            if (s != null) {
                mTextView.setText(s);
            }
        }

        @Override
        protected String doInBackground(URL... urls) {
            URL url = urls[0];
            return makeOdjazdQuery(url);
        }
    }