private List<NameValuePair> mParams = new ArrayList<NameValuePair>();
 private DefaultHttpClient mHttpClient;
 private HttpPost mHttpPost;

mHttpClient = new DefaultHttpClient();
        mHttpPost = new HttpPost(url);
        mParams.add(new BasicNameValuePair("key", value));
        mHttpPost.setEntity(new UrlEncodedFormEntity(mParams));