How to oauth url request using SignPost Android

WebUtil

 public static WebRequestTimeout sendGetRequestToServer(Context mContext, URL para_URL)
    {
        HttpURLConnection getRequest = null;
        WebRequestTimeout webRequestTimeout = new WebRequestTimeout();
        try
        {
            getRequest = (HttpURLConnection) para_URL.openConnection();
            String authtoken = PrefUtils.getAuthToken(mContext);
            DefaultOAuthConsumer consumer = new DefaultOAuthConsumer(WebUtils.CONSUMER_KEY, WebUtils.CONSUMER_SECERT);
            // sign the request (consumer is a Signpost DefaultOAuthConsumer)
            consumer.setTokenWithSecret(authtoken, null);
            getRequest.setConnectTimeout(CONNECT_TIMEOUT_MILLIS); // 1 minute
            getRequest.addRequestProperty("Accept", "application/json");
            getRequest.addRequestProperty("Content-Type", "application/json");
            getRequest.setReadTimeout(READ_TIMEOUT_MILLIS);
            consumer.sign(getRequest);

            getRequest.getResponseCode();
            // Send post request
            getRequest.connect();
            webRequestTimeout.setRequest(getRequest);
            return webRequestTimeout;
        } catch (SocketTimeoutException e)
        {
            e.printStackTrace();
            webRequestTimeout.setIsThisTimeOutRequest(true);
            return webRequestTimeout;
        } catch (ConnectTimeoutException e)
        {
            webRequestTimeout.setIsThisConnectionTimeoutRequest(true);
            e.printStackTrace();
            return webRequestTimeout;
        } catch (Exception e)
        {
            e.getMessage();
            return null;
        } finally
        {
            // clean up
            /*
			 * try { getRequest.disconnect(); return getRequest; } catch (Exception e) { // TODO Auto-generated catch
			 * block e.printStackTrace(); }
			 */
        }

    }