如何在SOAP函数中传递ArrayList作为参数？

Question

我正在开发一个Android应用程序，我需要将一个ArrayList作为参数传递给提供Web服务的SOAP函数。这是我使用的代码：

public boolean addToCart(String username, ArrayList<String> itemsSelected, ArrayList<Integer> idsSelected) throws ServerOfflineException {

    String METHOD_NAME = "addToCart";
    String SOAP_ACTION = "\"" + NAMESPACE + METHOD_NAME + "\"";

    try {

        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

        PropertyInfo usernameInfo = new PropertyInfo();
        usernameInfo.setName("arg0");
        usernameInfo.setValue(username);

        PropertyInfo itemsInfo = new PropertyInfo();
        itemsInfo.setName("arg1");
        itemsInfo.setValue(itemsSelected);

        PropertyInfo idsInfo = new PropertyInfo();
        idsInfo.setName("arg2");
        idsInfo.setValue(idsSelected);

        request.addProperty(usernameInfo);
        request.addProperty(itemsInfo);
        request.addProperty(idsInfo);

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.setOutputSoapObject(request);

        HttpTransportSE ht = new HttpTransportSE(URL);
        ht.call(SOAP_ACTION, envelope);

        SoapPrimitive response = (SoapPrimitive) envelope.getResponse();

        String responseData = response.toString();

        if (responseData.equals("true")){
            return true;
        }
        else if (responseData.equals("false")){
            return false;
        }
    } catch (Exception e) {
        Log.i("Error:" , e.getMessage());
        if (e instanceof SocketException) {
            throw new ServerOfflineException("Server Offline");
        }
    }
    return false;
}

但是，我收到错误 ArrayLists无法序列化。有谁知道我应该做什么？