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我有一个肥皂网络服务和一个用于调用服务的 android 应用程序。应用程序总是可以工作，但在上次 web 服务更新后，出现了问题。webservice的更新只是为了删除一些未使用的服务。其他代码未修改。我的 android 应用程序使用 AsyncTask 调用服务并返回结果：

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

@SuppressWarnings("unchecked")
@Override
protected Vector<SoapObject> doInBackground(Void... arg0) {
    try {
        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

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

        androidHttpTransport.call(SOAP_ACTION, envelope);
        Vector<SoapObject> result = (Vector<SoapObject>) envelope.getResponse();

        return result;
    } catch (IOException e) {
        e.printStackTrace();
    } catch (XmlPullParserException e) {
        e.printStackTrace();
    }
    return null;
}

但我得到了随后的错误：

10-11 18:36:25.063: E/AndroidRuntime(9250): FATAL EXCEPTION: AsyncTask #1
10-11 18:36:25.063: E/AndroidRuntime(9250): java.lang.RuntimeException: An error occured while executing doInBackground()
10-11 18:36:25.063: E/AndroidRuntime(9250):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at java.lang.Thread.run(Thread.java:841)
10-11 18:36:25.063: E/AndroidRuntime(9250): Caused by: java.lang.ClassCastException: org.ksoap2.serialization.SoapObject cannot be cast to java.util.Vector
10-11 18:36:25.063: E/AndroidRuntime(9250):     at com.example.soapclient.DownloadDataTask.doInBackground(DownloadDataTask.java:49)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at com.example.soapclient.DownloadDataTask.doInBackground(DownloadDataTask.java:1)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
10-11 18:36:25.063: E/AndroidRuntime(9250):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
10-11 18:36:25.063: E/AndroidRuntime(9250):     ... 4 more

其中第 49 行是我调用 getResult() 方法的行。

怎么了？

4

1 回答 1

1

原因很明确：

    Caused by: java.lang.ClassCastException: org.ksoap2.serialization.SoapObject 
cannot be cast to java.util.Vector

在这一行中，您不能将结果 SoapObject 转换为 Vector：

Vector<SoapObject> result = (Vector<SoapObject>) envelope.getResponse();

尝试这个：

SoapObject result = (SoapObject) envelope.getResponse();
于 2013-10-23T17:48:14.057 回答