چطوری میشه از Threat یه مقداری رو برگردوند ؟ (حل شد)

کد زیر مقدار صفر رو بر می گردونه ولی من دنبال مقدار تغییر کرده filesize هستم

 public static String fileSize(final String downloadPath) {
        Thread thread = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    URL url = new URL(downloadPath);
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setDoOutput(true);
                    connection.connect();

                    fileSize = connection.getContentLength();

                }
                catch (MalformedURLException e) {
                    e.printStackTrace();
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
        thread.start();
        float fileSizeMB = (float) fileSize / (1024 * 1024);
        return String.format("%.1f MB", fileSizeMB);

    }