java - How to use ksoap2 to call a web service -

i have been trying connect w3schools tempconvert web service andorid using ksoap2, result whenever calling method com.example.myproject.mytask@

the code have used is

public class mytask extends asynctask<string, integer, string>{  private static final string soap_action = "http://www.w3schools.com/webservices/celsiustofahrenheit"; private static final string operation_name = "celsiustofahrenheit"; private static final string namespace = "http://www.w3schools.com/webservices/"; private static final string url = "http://www.w3schools.com/webservices/tempconvert.asmx?wsdl";  @override protected string doinbackground(string... params) {     string response = null;     soapobject request = new soapobject(namespace, operation_name);     request.addproperty("celsius", "1");     //request.addproperty("strcommandparameters", params[1]);        soapserializationenvelope soapenvelope = new soapserializationenvelope(         soapenvelope.ver11);     soapenvelope.dotnet = true;     soapenvelope.setoutputsoapobject(request);     // needed make internet call      // allow debugging - needed output request      httptransportse androidhttptransport = new httptransportse(url);     androidhttptransport.debug = true;     // actual part call webservice     try {         androidhttptransport.call(soap_action, soapenvelope);     } catch (httpresponseexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (ioexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (xmlpullparserexception e) {         // todo auto-generated catch block         e.printstacktrace();     }      // soapresult envelope body.     soapobject result = (soapobject) soapenvelope.bodyin;        response = result.getproperty(0).tostring();         return response; } 

}

and call oncreate method using

mytask mytask = new mytask(); mytask.execute(new string[] {"celsius", "1"}).tostring() 

(btw realise sending parameters method pointless because set in called method.)

*******mytask class********

import org.ksoap2.soapenvelope; import org.ksoap2.serialization.soapobject; import org.ksoap2.serialization.soapserializationenvelope; import org.ksoap2.transport.httptransportse;  import android.content.context; import android.os.asynctask;  public class mytask extends asynctask<string, integer, string> {     private asynctaskcompletelistener callback;      public mytask(context context, mainactivity mainactivity) {         // todo auto-generated constructor stub         callback = mainactivity;     }      private static final string soap_action = "http://www.w3schools.com/webservices/celsiustofahrenheit";     private static final string operation_name = "celsiustofahrenheit";     private static final string namespace = "http://www.w3schools.com/webservices/";     private static final string url = "http://www.w3schools.com/webservices/tempconvert.asmx?wsdl";      @override     protected string doinbackground(string... params) {         string response = null;         soapobject request = new soapobject(namespace, operation_name);         request.addproperty("celsius", "1");          soapserializationenvelope soapenvelope = new soapserializationenvelope(soapenvelope.ver11);         soapenvelope.dotnet = true;         soapenvelope.setoutputsoapobject(request);          httptransportse androidhttptransport = new httptransportse(url);         androidhttptransport.debug = true;         // actual part call webservice         try {             androidhttptransport.call(soap_action, soapenvelope);         } catch (exception e) {             // todo auto-generated catch block             e.printstacktrace();         }          // soapresult envelope body.         soapobject result = (soapobject) soapenvelope.bodyin;         response = result.getproperty(0).tostring();         return response;     }      @override     protected void onpostexecute(string result) {         // todo auto-generated method stub         callback.ontaskcomplete(result);         super.onpostexecute(result);     } } 

*******asynctaskcompletelistener******
create new separate interface

public interface asynctaskcompletelistener {     public void ontaskcomplete(string result); } 

*******mainactivity********
1. main activity must implements asynctaskcompletelistener
2. override below method in main activity.

@override     public void ontaskcomplete(string result) {         toast.maketext(getapplicationcontext(), result, toast.length_long).show();     } 

3. call mytask class using
   

   new mytask(getapplicationcontext(), mainactivity.this).execute();