android interfacing with mysql database -

i'm trying fetch username , password values mysql database using soap. i'm getting 'android.os.networkonmainthreadexception', please tell me how use asynctask avoid exception.

package com.example.androidloginexampleactivity;

import java.io.ioexception;  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.activity; import android.os.bundle; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.textview; import android.widget.toast;  public class androidloginexampleactivity extends activity {     private final string namespace = "http://10.0.2.2:80/urn:stockserver";     private final string url = "http://10.0.2.2:80/stockserver1.php?wsdl";      //private final string url = " http://10.0.2.2:8080/webapplication2/login?tester";     private final string soap_action = "http://10.0.2.2:80/urn:stockserver#getstockquote";     private final string method_name = "getstockquote";     /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_android_login_example);         button login = (button) findviewbyid(r.id.btn_login);         login.setonclicklistener(new view.onclicklistener() {              public void onclick(view arg0) {                 loginaction();             }         });     }      private void loginaction(){         soapobject request = new soapobject(namespace, method_name);          edittext username = (edittext) findviewbyid(r.id.tf_username);         string user_name = username.gettext().tostring();         edittext userpassword = (edittext) findviewbyid(r.id.tf_password);         string user_password = userpassword.gettext().tostring();          //pass value username variable of web service         propertyinfo unameprop =new propertyinfo();         unameprop.setname("username");//define variable name in web service method         unameprop.setvalue(user_name);//set value username variable         unameprop.settype(string.class);//define type of variable         request.addproperty(unameprop);//pass properties variable          //pass value password variable of web service         propertyinfo passwordprop =new propertyinfo();         passwordprop.setname("password");         passwordprop.setvalue(user_password);         passwordprop.settype(string.class);         request.addproperty(passwordprop);          soapserializationenvelope envelope = new soapserializationenvelope(soapenvelope.ver10);         envelope.setoutputsoapobject(request);         httptransportse androidhttptransport = new httptransportse(url);          try{             androidhttptransport.call(soap_action, envelope);             soapprimitive response = (soapprimitive)envelope.getresponse();              textview result1 = (textview) findviewbyid(r.id.tv_status);             result1.settext(response.tostring());             toast.maketext(getapplicationcontext(), response.tostring(), 5).show();          }         catch(exception e){             toast.maketext(getapplicationcontext(), e.tostring(), 5).show();           }     }  } 

convert loginaction inner class extends asynctask. override preexecute method of setup. use onexecute method network communication. processing results in postexecute method.

here tutorial: http://codeoncloud.blogspot.com/2013/07/android-web-service-access-using-async.html