我有一个在android中使用httpget从webservice获取数据的方法。
这是我的密码：

protected Void doInBackground(Void... arg0){

            HttpHandler sh = new HttpHandler();

            // making request to url and getting respose
            String jsonStr = sh.makeServiceCall(url);

            Log.e(TAG, "Response from url: " +jsonStr);

            if (jsonStr != null){
                try {
                    JSONObject jsonObject = new JSONObject(jsonStr);

                    // getting json array node
                    JSONArray shipments = jsonObject.getJSONArray("string");

                    // looping through all shipments
                    for (int i = 0; i < shipments.length(); i++){

                        JSONObject c = shipments.getJSONObject(i);

                        String id = c.getString("ID");
                        String controlnumber = c.getString("ControlNumber");
                        String clientcn = c.getString("clientcn");
                        String chargeableweight = c.getString("ChargeableWeight");

                        // tmp hashmap for single shipmentdetail
                        HashMap<String, String> shipment = new HashMap<>();

                        // adding each child nodeto hashmap
                        shipment.put("id", id);
                        shipment.put("controlnumber", controlnumber);
                        shipment.put("clientcn", clientcn);
                        shipment.put("chargeableweight", chargeableweight);

                        // adding shipment to shipment list
                        shipmentList.add(shipment);
                    }
                }catch (final JSONException e){
                    Log.e(TAG, "Json parsing error: " +e.getMessage());
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getApplicationContext(),
                                    "Json parsing error: " +e.getMessage(),
                                    Toast.LENGTH_LONG).show();
                        }
                    });
                }
            }else {
                Log.e(TAG, "Couldn't get Json from server.");
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Couldn't get json from server. Check LogCat for possible errors!",
                                Toast.LENGTH_LONG).show();
                    }
                });
            }
            return null;
        }

public String makeServiceCall(String reqUrl){

        String response = null;

        try {

            URL url = new URL(reqUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");

             //read the response
            InputStream in = new BufferedInputStream(conn.getInputStream());
            response = convertStreamToString(in);
        }catch (MalformedURLException e){
            Log.e(TAG, "MalformedException: " +e.getMessage());
        }catch (ProtocolException e){
            Log.e(TAG, "Protocal Exception: " +e.getMessage());
        }catch (IOException e){
            Log.e(TAG, "IOException: " +e.getMessage());
        }catch (Exception e){
            Log.e(TAG, "Exception: " +e.getMessage());
        }
        return response;
    }

    private String convertStreamToString(InputStream is){

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line;
        try {
            while ((line = reader.readLine()) != null){

                sb.append(line).append('\n');
            }
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            try {
                is.close();
            }catch (IOException e){
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

my web service以以下格式返回数据：

Response from url: <?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">[{"ID":144412,"ControlNumber":186620,"clientcn":160054,"ChargeableWeight":1.00,"TotalPieces":1,"SpecialPickup":false,"ReadyDate":null,"CompanyName":"233 / Evergreen","CompanyAddress":"582 Tuna Street","CompanyAddress1":"45288","City":"Terminal Island","State":"CA","ZipCode":"90731","ContactPhone":"","ContactName":"","C_CompanyName":"Mitoy Logistics","C_CompanyAddress":"1140 Alondra blvd","C_CompanyAddress1":"","C_City":"Compton","C_State":"CA","C_ZipCode":"90220","C_ContactPhone":"","C_ContactName":"John ","priority":5,"FreightShipment":false,"FreightDetails":"20 STD CNTR#  SCLU7888484"}]</string>

如何在android中将响应转换为json对象？这正在消磨我宝贵的时间，不能再继续下去了。我被困在这里了。
任何想法或建议请！
提前谢谢。。