Question

我已经按照谷歌开发者网站上的教程实现了我的SOAP webservice，现在我正在编写一个Android应用程序，它使用ksoap2库调用可用服务并显示结果（现在在textview中）。这就是代码：

public class DownloadDataTask extends AsyncTask<Void, Void, SoapObject> {
private static String METHOD_NAME = "getData";
private static String SOAP_ACTION = "http://example.com/getData";
private static String WSDL_URL = "http://arduino-data-server.appspot.com/FunctionsService.wsdl";
private static String NAMESPACE = "http://example.com/";
private MainActivity caller_activity;

public DownloadDataTask(MainActivity a) {
    caller_activity = a;
}

@Override
protected SoapObject doInBackground(Void... arg0) {
    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
            SoapEnvelope.VER12);
    envelope.setOutputSoapObject(request);
    HttpTransportSE androidHttpTransport = new HttpTransportSE(WSDL_URL);

    try {
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapObject result = (SoapObject) envelope.getResponse();
        return result;
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (XmlPullParserException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return null;
}

@Override
protected void onPostExecute(SoapObject result) {
    TextView tw = (TextView) caller_activity.findViewById(R.id.text_view);
    if (result == null) {
        tw.setText("NULL");
    } else {
        tw.setText(result.getName());
    }
}
}

但每次，结果SoapObject都是null。怎么了？在appengine服务器日志，我可以看到Android应用程序要求wsdl文件，但没有发送服务请求。有什么问题（wsdl文件可以在我的代码中写入ad url）？

Answer 1

Ksoap不使用wsdl（因此不会请求它）。您应该传递服务URL而不是wsdl url。您可以在wsdl（服务说明部分中location元素的属性address）中找到服务网址。

服务调用的SoapObject结果始终为null

1 个答案: