MainActivity.java

    private URL createUrl(String param) {
        Uri builtUri = Uri.parse(ODJAZD_SERVER_URL).buildUpon().appendQueryParameter(PARAM_FROM, param).build();

        URL url = null;
        try {
            url = new URL(builtUri.toString());
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        return url;
    }