使用k2 soap在android中使用catalogInventoryStockItemList按产品ID检索库存数据列表

嗨，我想显示的是我的android应用程序中可用的特定产品的库存，我想通过catalogInventoryStockItemList方法通过k2 soap api检索产品

谁能告诉我怎么做

public  void getproductstock(){

SoapObject request = new SoapObject(NAMESPACE, "catalogInventoryStockItemList");
//SoapSerializationEnvelope envelope =new SoapSerializationEnvelope(SoapEnvelope.VER11);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

envelope.dotNet = true;
envelope.setOutputSoapObject(request);

HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

try
{
    androidHttpTransport.call("", envelope);
    SoapObject response = (SoapObject)envelope.getResponse();
    String result = response.getProperty(4).toString();
    tv_products.setText(result);
}
catch(Exception e)
   {
        e.printStackTrace();
   }
}

但我无法在textview中获取并显示特定产品的is_in_stock属性