AsyncTask 및 이전 메서드를 사용하여 Android에서 POST 데이터를 보내는 방법은 무엇입니까?

public class CallAPI extends AsyncTask<String, String, String> {

    @Override
    protected String doInBackground(String... params) {
        String urlString = params[0];
        String data = params[1];

        try {
            URL url = new URL(urlString);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out, "UTF-8"));
            writer.write(data);
            writer.flush();
            writer.close();
            out.close();
            urlConnection.connect();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }

        return null;
    }
}

public void postData() {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");

    try {
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
        nameValuePairs.add(new BasicNameValuePair("id", "12345"));
        nameValuePairs.add(new BasicNameValuePair("stringdata", "Hi"));
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        HttpResponse response = httpclient.execute(httppost);
    } catch (Exception e) {
        // TODO Auto-generated catch block
    }
}