gistfile1.txt

RestAdapter restAdapter = RestApi.init(this, sCurrentUrl);
final ServiceApi serverApi = restAdapter.create(ServiceApi.class);

mServiceApi = (ServiceApi) Proxy.newProxyInstance(ServiceApi.class.getClassLoader(), new Class<?>[]{ServiceApi.class},
		new InvocationHandler()
		{
			@Override
			public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
			{
				final Method serviceApiMethod = serviceApi.getClass().getMethod(method.getName(), method.getParameterTypes());

				final Object result = serviceApiMethod.invoke(serviceApi, args);

				Exception exception = null;

				if (result instanceof IServiceResponseData)
				{
					final IServiceResponseData responseData = (IServiceResponseData) result;

					final ResponseHeader responseHeader = responseData.getHeader();

					if (responseHeader.getStatusCode() != ResponseCode.Success)
					{
						if (responseHeader.getStatusCode() == ResponseCode.SystemOffline)
						{
							throw RetrofitError.unexpectedError(null, new SystemOfflineException(responseHeader.getStatusCode(), "Sorry, System is offline. Try again later."));
						}

						throw RetrofitError.unexpectedError(null, new ServerCodeException(responseHeader.getStatusCode(), "Sorry, some problem occur. Please, try again later"));
					}

					if (responseData instanceof ICustomerRequest)
					{
						//TODO process result

						final CustomerActionResult customerActionResult = ((ICustomerRequest) responseData).getResult();

						if (customerActionResult != CustomerActionResult.Success)
						{
							throw RetrofitError.unexpectedError(null, new CustomerActionException(customerActionResult, responseData));
						}
					}
				}

				return result;
			}
		});