android - Android ksoap2 使用 AsyncTask 引发异常

Question

我有一个连接到 Web 服务并返回 SoapObject 的函数。如果我在没有 AsyncTask 的情况下直接调用此函数，则此函数可以正常工作，但以下代码会引发异常。有什么建议么？

 private class LoginTask extends AsyncTask<String, Object, Object> {
    protected SoapObject doInBackground(String... params) {
       try
       {
          return callWebService("a","a");           
       }
       catch (Exception e)
       {
          return null;
       }
    }
    protected void onPostExecute(SoapObject result) {
        setErrorText(result);
    }

 }

private SoapObject callWebService(String UserName, String Password) {

    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
    request.addProperty("UserName", UserName);
    request.addProperty("Password", Password);

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

    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
    androidHttpTransport.debug = true;

    try {
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapObject response = (SoapObject) envelope.getResponse(); //this code causes the problem
        return response;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    } catch (XmlPullParserException e) {
        e.printStackTrace();
        return null; //Directly jumps to here
    }

}

Answer 1

如果您将任务声明更改为：

    private class LoginTask extends AsyncTask<String, Object, Object>

至

    private class LoginTask extends AsyncTask<String, Object, SoapObject>

你的 onPostExecute() 应该执行。