当我尝试从 android 应用程序调用 web 服务时出现以下错误，这是我的 logcat
05-15 12:33:26.327: E/Error :(339): Error on IOException() System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Exception: Object reference not set to an instance of an object.
05-15 12:33:26.327: E/Error :(339): at WebService.SetLocationForAndroid(String Latitude, String Longitude, String sUserId)
05-15 12:33:26.327: E/Error :(339): --- End of inner exception stack trace ---
05-15 12:33:26.327: W/System.err(339): SoapFault - faultcode: 'soap:Server' faultstring: 'System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Exception: Object reference not set to an instance of an object.
05-15 12:33:26.337: W/System.err(339): at WebService.SetLocationForAndroid(String Latitude, String Longitude, String sUserId)
05-15 12:33:26.337: W/System.err(339): --- End of inner exception stack trace ---' faultactor: 'null' detail: org.kxml2.kdom.Node@43e9fac0
05-15 12:33:26.377: W/System.err(339): at org.ksoap2.serialization.SoapSerializationEnvelope.parseBody(SoapSerializationEnvelope.java:141)
05-15 12:33:26.377: W/System.err(339): at org.ksoap2.SoapEnvelope.parse(SoapEnvelope.java:140)
05-15 12:33:26.387: W/System.err(339): at org.ksoap2.transport.Transport.parseResponse(Transport.java:100)
05-15 12:33:26.387: W/System.err(339): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:214)
05-15 12:33:26.397: W/System.err(339): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:96)
05-15 12:33:26.397: W/System.err(339): at com.practice.locationtracking.LocationService.sendLocation(LocationService.java:144)
05-15 12:33:26.397: W/System.err(339): at com.practice.locationtracking.LocationService.access$0(LocationService.java:114)
05-15 12:33:26.397: W/System.err(339): at com.practice.locationtracking.LocationService$1.run(LocationService.java:101)
05-15 12:33:26.397: W/System.err(339): at android.os.Handler.handleCallback(Handler.java:587)
05-15 12:33:26.407: W/System.err(339): at android.os.Handler.dispatchMessage(Handler.java:92)
05-15 12:33:26.407: W/System.err(339): at android.os.Looper.loop(Looper.java:123)
05-15 12:33:26.417: W/System.err(339): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-15 12:33:26.417: W/System.err(339): at java.lang.reflect.Method.invokeNative(Native Method)
05-15 12:33:26.417: W/System.err(339): at java.lang.reflect.Method.invoke(Method.java:521)
05-15 12:33:26.417: W/System.err(339): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-15 12:33:26.417: W/System.err(339): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-15 12:33:26.417: W/System.err(339): at dalvik.system.NativeStart.main(Native Method)
请帮我解决我的问题。问题出在哪里，我找不到。。
我的服务的代码如下，它将数据发送到网络服务。
package com.practice.locationtracking;
import java.io.IOException;
import java.net.SocketException;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.Toast;
public class LocationService extends Service
{
GPSTracker gps;
private Handler handler = new Handler();
String latitude="27.40", longitude="72.40";
String UserId = "";
private static final String TAG = "LocationService";
//used for getting the handler from other class for sending messages
public static Handler mMyServiceHandler = null;
//used for keep track on Android running status
public static Boolean mIsServiceRunning = false;
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate()
{
final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
UserId = prefs.getString("user_name", null);
Toast.makeText(getApplicationContext(), "User Name is : " + UserId, Toast.LENGTH_SHORT).show();
//Toast.makeText(this, "Location Tracking Service Created",Toast.LENGTH_SHORT).show();
Log.d(TAG,"On Create");
}
@Override
public void onStart(Intent intent, int startId)
{
Toast.makeText(this, "Location Tracking Service Started",Toast.LENGTH_SHORT).show();
Log.d(TAG,"On Start");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Toast.makeText(this, "Location Tracking Service Started",Toast.LENGTH_SHORT).show();
//Toast.makeText(getApplicationContext(), "User Name is : " + UserId, Toast.LENGTH_SHORT).show();
mIsServiceRunning = true;
handler.post(timedTask);
return START_STICKY;
}
@Override
public void onDestroy()
{
handler.removeCallbacks(timedTask);
Toast.makeText(this, "Location Tracking Service Stopped", Toast.LENGTH_SHORT).show();
Log.d(TAG, "onDestroy");
mIsServiceRunning = false; // make it false, as the service is already destroyed.
}
private Runnable timedTask = new Runnable()
{
@Override
public void run()
{
gps = new GPSTracker(LocationService.this);
if(gps.canGetLocation())
{
double lat = gps.getLatitude();
double lon = gps.getLongitude();
latitude = Double.toString(lat);
longitude = Double.toString(lon);
if(latitude.equalsIgnoreCase("0.0") || longitude.equalsIgnoreCase("0.0"))
{
Toast.makeText(getApplicationContext(), "Can not get Location Details from Device", Toast.LENGTH_SHORT).show();
// System.out.println("We were here");
}
else
{
boolean flag = sendLocation(latitude, longitude, UserId);
//boolean flag = true;
Toast.makeText(getApplicationContext(), "Your Location is - \nLatitude: " + latitude + "\nLongitude: " + longitude + "\n Flag: " + flag, Toast.LENGTH_SHORT).show();
}
}
else
{
gps.showSettingsAlert();
}
handler.postDelayed(timedTask, 5000);
}
};
private boolean sendLocation(String latitude, String longitude, String UserName)
{
/* final String NAMESPACE = "http://tempuri.org/";
final String URL = "http://10.0.2.2:25722/NewLocationMap/Service.asmx";
final String SOAP_ACTION = "http://tempuri.org/SetLocationForAndroid";
final String METHOD_NAME = "SetLocationForAndroid";
*/
final String NAMESPACE = "http://www.enoxonline.in/";
final String URL = "http://www.enoxonline.in/Webservice.asmx";
final String SOAP_ACTION = "http://tempuri.org/SetLocationForAndroid";
final String METHOD_NAME = "SetLocationForAndroid";
boolean flag = false;
SoapObject request = new SoapObject (NAMESPACE, METHOD_NAME);
PropertyInfo pi = new PropertyInfo();
pi.setName("Latitude");
pi.setValue(latitude);
pi.setType(String.class);
request.addProperty(pi);
pi = new PropertyInfo();
pi.setName("Longitude");
pi.setValue(longitude);
pi.setType(String.class);
request.addProperty(pi);
pi = new PropertyInfo();
pi.setName("UserId");
pi.setValue(UserName);
pi.setType(String.class);
request.addProperty(pi);
// request.addProperty("Latitude",latitude);
// request.addProperty("Longitude", longitude);
// request.addProperty("sUserId", UserName);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet=true;
envelope.xsd = NAMESPACE;
envelope.enc = "http://schemas.datacontract.org/2004/07/Entity";
envelope.setOutputSoapObject(request);
System.out.println(request);
try
{
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
androidHttpTransport.setXmlVersionTag("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
androidHttpTransport.call(SOAP_ACTION, envelope);
SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
//Log.e("Result: ", "" + response.toString());
System.out.println(response.toString());
if(response.toString().equalsIgnoreCase("true"))
{
flag=true;
}
else
{
flag=false;
}
}
catch(SocketException ex)
{
Log.e("Error : " , "Error on SocketException " + ex.getMessage());
ex.printStackTrace();
}
catch(IOException ex1)
{
Log.e("Error : " , "Error on IOException() " + ex1.getMessage());
ex1.printStackTrace();
}
catch(Exception e)
{
Log.e("Error : " , "Error on IOException() " + e.getMessage());
e.printStackTrace();
}
return flag;
}
}