调用webservice出错,代码如下(返回结果是json格式字符串):
        public String getConnect(String methodName, String parameter) {
                try {
                        SoapObject request = new SoapObject("http://service", methodName);
                        request.addProperty("test", parameter);
                        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                                        SoapEnvelope.VER11);
                        envelope.bodyOut = request;
                        HttpTransportSE ht = new HttpTransportSE(HOSTADDRESS);
                        ht.call(null, envelope);
                        if (envelope.getResponse() != null) {
                                SoapObject soapObject = (SoapObject) envelope.getResponse();
                                return soapObject.getAttribute(0).toString();
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                        return null;
                }
                return null;
        }