Android HTTP Post request, in an Asynchronous background process

Android PostRequest

/**
* Paschalis Mpeis
* paschalis.mp
*
* Usage: AsyncPostRequest r = new AsyncPostRequest(url, parameters); r.execute();
*/

/**
   * AsyncPostRequest class
	 */
	public static class AsyncPostRequest extends AsyncTask<Object, Integer, String> {

		final ArrayList<NameValuePair> mNameValuePairs;
		final String url;

		public AsyncPostRequest(String url, ArrayList<NameValuePair> nameValuePairs) {

			this.mNameValuePairs = nameValuePairs; // The parameters to the post request
			this.url = url;
		}

		/**
		 * @param link   of the PHP Script
		 * @param values to build the PHP Post (eg. username=abc)
		 * @return JSON Object with the result
		 */
		public static String httpPostRequest(String link,
		                                     ArrayList<NameValuePair> values) {


			String result = null;
			InputStream inputStream = null;

			try {
				// HttpClient will execute the Post
				HttpClient httpclient = new DefaultHttpClient();

				// Make new HTTP Post @link
				HttpPost httppost = new HttpPost(link);

				// Put variables on the HTTP Post
				httppost.setEntity(new UrlEncodedFormEntity(values));

				// Execute & get the response
				HttpResponse response = httpclient.execute(httppost);

				// Save response in InputStream
				HttpEntity entity = response.getEntity();
				inputStream = entity.getContent();

				// Convert response
				BufferedReader reader = new BufferedReader(
						new InputStreamReader(inputStream, "iso-8859-1"), 8);

				StringBuilder stringBuilder = new StringBuilder();
				String line = null;

				while ((line = reader.readLine()) != null) {
					stringBuilder.append(line + "\n");
				}
				// Close Stream
				inputStream.close();

				result = stringBuilder.toString();

			} catch (Exception e1) {
				Log.e(TAG, "Error in http.post " + e1.toString());
				return null;
			}
			// Return result
			return result;
		}

		@Override
		protected void onPreExecute() {
			super.onPreExecute();

			//Show progress bar in actionbar
			// activity.setProgressBarIndeterminateVisibility(true);
			//Disable menu buttons
		}

		@Override
		protected String doInBackground(Object... objects) {
			return httpPostRequest(url, mNameValuePairs);
		}

		@Override
		protected void onPostExecute(String result) {
			super.onPostExecute(result);

			//to Hide progress bar in actionbar
			// activity.setProgressBarIndeterminateVisibility(false);

			// Run functions when finished
      Log.e(TAG, "Result got: " + result);
		}
}