Android background service ksoap error -

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i developing android application background service consumes method of web service on every 5 mins. using ksoap 2.4 , asp.net web service. android background service running on every 5 mins but

 androidhttptransport.call(soap_action+webmethname, envelope);

returns null. here android service code.

package com.example.rashid.challandb;  import android.app.service; import android.content.context; import android.content.intent; import android.os.ibinder; import org.ksoap2.soapenvelope; import org.ksoap2.serialization.marshalbase64; import org.ksoap2.serialization.propertyinfo; import org.ksoap2.serialization.soapobject; import org.ksoap2.serialization.soapserializationenvelope; import org.ksoap2.transport.httptransportse; public class testservice extends service { private static string namespace = "http://tempuri.org/"; private static string url = "http://192.168.50.107:80/androidservice/service1.asmx"; private static string soap_action = "http://tempuri.org/"; context context; boolean isrunning; public testservice() { } @override public  void oncreate() {     this.context=this;     this.isrunning=false; } @override public ibinder onbind(intent intent) {     return null; }  @override public int onstartcommand(intent intent,int flags,int startid) {     if (!this.isrunning) {         this.isrunning = true;         synchronized (this) {             try {                 string restxt = "default";                 string webmethname="mymethod";                 soapobject request = new soapobject(namespace, webmethname);                  propertyinfo first = new propertyinfo();                 first.setname("para");                 first.setvalue("hullow");                 first.settype(string.class);                 request.addproperty(first);                  soapserializationenvelope envelope = new soapserializationenvelope(                         soapenvelope.ver11);                 envelope.dotnet = true;                 envelope.setoutputsoapobject(request);                  httptransportse androidhttptransport = new httptransportse(url);                  try {                      androidhttptransport.call(soap_action+webmethname, envelope);                     object response = null;                     response = (object) envelope.getresponse();                     restxt =response.tostring();                  } catch (exception e) {                     e.printstacktrace();                     system.out.println(   e.getmessage()+" phone");                 }                  system.out.println(  restxt);              } catch (exception ex) {                 system.out.println("error:" + ex.getmessage());             }             this.isrunning = false;             stopself();         }     }     return start_sticky; } @override public void ondestroy() {     this.isrunning=false; } }

here wsdl

<wsdl:definitions xmlns:s="http://www.w3.org/2001/xmlschema" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:tns="http://tempuri.org/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tm="http://microsoft.com/wsdl/mime/textmatching/" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" targetnamespace="http://tempuri.org/"> <wsdl:types> <s:schema elementformdefault="qualified" targetnamespace="http://tempuri.org/"> <s:element name="mymethod"> <s:complextype> <s:sequence> <s:element minoccurs="0" maxoccurs="1" name="para" type="s:string"/> </s:sequence> </s:complextype> </s:element> <s:element name="mymethodresponse"> <s:complextype> <s:sequence> <s:element minoccurs="0" maxoccurs="1" name="mymethodresult" type="s:string"/> </s:sequence> </s:complextype> </s:element> </s:schema> </wsdl:types> <wsdl:message name="mymethodsoapin"> <wsdl:part name="parameters" element="tns:mymethod"/> </wsdl:message> <wsdl:message name="mymethodsoapout"> <wsdl:part name="parameters" element="tns:mymethodresponse"/> </wsdl:message> <wsdl:porttype name="service1soap"> <wsdl:operation name="mymethod"> <wsdl:input message="tns:mymethodsoapin"/> <wsdl:output message="tns:mymethodsoapout"/> </wsdl:operation> </wsdl:porttype> <wsdl:binding name="service1soap" type="tns:service1soap"> <soap:binding transport="http://schemas.xmlsoap.org/soap/http"/> <wsdl:operation name="mymethod"> <soap:operation soapaction="http://tempuri.org/mymethod" style="document"/> <wsdl:input> <soap:body use="literal"/> </wsdl:input> <wsdl:output> <soap:body use="literal"/> </wsdl:output> </wsdl:operation> </wsdl:binding> <wsdl:binding name="service1soap12" type="tns:service1soap"> <soap12:binding transport="http://schemas.xmlsoap.org/soap/http"/> <wsdl:operation name="mymethod"> <soap12:operation soapaction="http://tempuri.org/mymethod" style="document"/> <wsdl:input> <soap12:body use="literal"/> </wsdl:input> <wsdl:output> <soap12:body use="literal"/> </wsdl:output> </wsdl:operation> </wsdl:binding> <wsdl:service name="service1"> <wsdl:port name="service1soap" binding="tns:service1soap"> <soap:address location="http://192.168.50.107/androidservice/service1.asmx"/> </wsdl:port> <wsdl:port name="service1soap12" binding="tns:service1soap12"> <soap12:address location="http://192.168.50.107/androidservice/service1.asmx"/> </wsdl:port> </wsdl:service> </wsdl:definitions>

try replace 

androidhttptransport.call(soap_action+webmethname, envelope);

with this

androidhttptransport.call("", envelope);

even not solved, please check exception return in line

system.out.println("error:" + ex.getmessage());

edit

soapobject request = new soapobject(namespace, webmethname); request.addproperty("para", "hullow");

remove propertyinfo part


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