我正在尝试使用 android 应用程序调用 Web 服务。所有网络操作都在扩展 AsyncTask 类的单独类中完成。
package com.webservicedemo1;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class WebServiceDemoActivity extends Activity
{
/** Called when the activity is first created. */
private static String SOAP_ACTION1 = "http://tempuri.org/FahrenheitToCelsius";
private static String SOAP_ACTION2 = "http://tempuri.org/CelsiusToFahrenheit";
private static String NAMESPACE = "http://tempuri.org/";
private static String METHOD_NAME1 = "FahrenheitToCelsius";
private static String METHOD_NAME2 = "CelsiusToFahrenheit";
private static String URL = "http://www.w3schools.com/webservices/tempconvert.asmx?WSDL";
Button btnFar, btnCel, btnClear;
EditText txtFar, txtCel;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_service_demo);
btnFar = (Button) findViewById(R.id.button1);
btnCel = (Button) findViewById(R.id.button2);
btnClear = (Button) findViewById(R.id.button3);
txtFar = (EditText) findViewById(R.id.editText1);
txtCel = (EditText) findViewById(R.id.editText2);
btnFar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME1);
request.addProperty("Fahrenheit", txtFar.getText().toString());
BackGround bg = new BackGround();
bg.execute(request);
//request.getP
}
});
btnCel.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME2);
request.addProperty("Celsius", txtCel.getText().toString());
BackGround bg = new BackGround();
bg.execute(request);
}
});
btnClear.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
txtCel.setText("");
txtFar.setText("");
}
});
}
private class BackGround extends AsyncTask<SoapObject, Object, SoapObject> {
SoapObject result = null;
@Override
protected SoapObject doInBackground(SoapObject... req) {
// TODO Auto-generated method stub
// Initialize soap request + add parameters
// Declare the version of the SOAP request
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
SoapEnvelope.VER11);
envelope.setOutputSoapObject(req);
envelope.dotNet = true;
try {
PropertyInfo pi = new PropertyInfo();
req[0].getPropertyInfo(0, pi);
String type=pi.getName();
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
if(type.equals("Fahrenheit")){
// this is the actual part that will call the webservice
androidHttpTransport.call(SOAP_ACTION1, envelope);
}
else if(type.equals("Celsius")){
androidHttpTransport.call(SOAP_ACTION2, envelope);
}
// Get the SoapResult from the envelope body.
result = (SoapObject) envelope.bodyIn;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return result;
}
@Override
protected void onPostExecute(SoapObject res) {
// TODO Auto-generated method stub
super.onPostExecute(res);
if (res != null) {
// Get the first property and change the label text
txtFar.setText(res.getProperty(0).toString());
}
else {
Toast.makeText(getApplicationContext(), "No Response",
Toast.LENGTH_LONG).show();
}
}
}
}
但我收到以下错误。
08-27 17:48:42.980: W/System.err(1014): java.lang.RuntimeException: Cannot serialize: [Lorg.ksoap2.serialization.SoapObject;@412102b0
08-27 17:48:42.980: W/System.err(1014): at org.ksoap2.serialization.SoapSerializationEnvelope.writeElement(SoapSerializationEnvelope.java:708)
08-27 17:48:42.980: W/System.err(1014): at org.ksoap2.serialization.SoapSerializationEnvelope.writeBody(SoapSerializationEnvelope.java:618)
08-27 17:48:42.990: W/System.err(1014): at org.ksoap2.SoapEnvelope.write(SoapEnvelope.java:198)
08-27 17:48:42.990: W/System.err(1014): at org.ksoap2.transport.Transport.createRequestData(Transport.java:111)
08-27 17:48:42.990: W/System.err(1014): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:119)
08-27 17:48:42.990: W/System.err(1014): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:95)
08-27 17:48:42.990: W/System.err(1014): at com.webservicedemo1.WebServiceDemoActivity$BackGround.doInBackground(WebServiceDemoActivity.java:128)
08-27 17:48:42.990: W/System.err(1014): at com.webservicedemo1.WebServiceDemoActivity$BackGround.doInBackground(WebServiceDemoActivity.java:1)
08-27 17:48:43.000: W/System.err(1014): at android.os.AsyncTask$2.call(AsyncTask.java:287)
08-27 17:48:43.000: W/System.err(1014): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-27 17:48:43.000: W/System.err(1014): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-27 17:48:43.000: W/System.err(1014): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
08-27 17:48:43.000: W/System.err(1014): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-27 17:48:43.000: W/System.err(1014): at >java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-27 17:48:43.000: W/System.err(1014): at java.lang.Thread.run(Thread.java:856)
无法找出为什么会发生这种情况。我的代码有什么问题？