Android - HTTP Post JSON

public void sendCommand(String cmd, String val) {
		String result = "";

		try {
			HttpPost request = new HttpPost(mAppSettings.getServiceUrl());
			request.setHeader("Accept", "application/json");
			request.setHeader("Content-type", "application/json");

			JSONStringer vehicle = new JSONStringer().object().key("cmd")
					.object().key("name").value(cmd).key("value").value(val)
					.key("user").value(mAppSettings.getUser()).key("password")
					.value(mAppSettings.getPassword()).endObject().endObject();
			StringEntity entity = new StringEntity(vehicle.toString(),
					HTTP.UTF_8);
			entity.setContentType("application/x-www-form-urlencoded; charset=UTF-8");
			entity.setContentEncoding("UTF-8");
			request.setEntity(entity);

			DefaultHttpClient httpClient = new DefaultHttpClient();
			HttpResponse response = httpClient.execute(request);

			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				InputStream inputStream = response.getEntity().getContent();
				InputStreamReader inputStreamReader = new InputStreamReader(
						inputStream, Charset.forName("UTF-8"));
				BufferedReader buffer = new BufferedReader(inputStreamReader);

				String inputLine = null;
				while ((inputLine = buffer.readLine()) != null) {
					result += inputLine + "\n";
				}

				if (result == "") {
					result = "Sending command error.";
				} else {
					JSONObject sendCmdResponse = new JSONObject(result);
					result = sendCmdResponse.getString("message");
				}
			} else {
				result = "Sending command error.";
			}

		} catch (Exception e) {
			result = "Sending command error.";
		}
	}