MainActivity.java

    private String makeOdjazdQuery(URL url) {

        if (url != null) {
            try {
                return getResponseFromHttpUrl(url);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return "";
    }

    private static String getResponseFromHttpUrl(URL url) throws IOException {
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        try {
            InputStream in = urlConnection.getInputStream();

            Scanner scanner = new Scanner(in);
            scanner.useDelimiter("\\A");

            boolean hasInput = scanner.hasNext();
            if (hasInput) {
                return scanner.next();
            } else {
                return null;
            }
        } finally {
            urlConnection.disconnect();
        }
    }