Android use string from activity in another activity Asynctask (Void) -

i have app need send string 1 activity , use string in asynctask part of activity. succesfully sent string , receive in oncreate part of second activity, in asynctask, string need part of feed url, receiving null value. gcmintentservices.java activity sends string androidrssreader activity, string msg1.

gcmintentservices.java:

package com.andrija.bladimircodewp;  import com.google.android.gms.gcm.googlecloudmessaging; import android.app.intentservice; import android.app.notification; import android.app.notificationmanager; import android.app.pendingintent; import android.app.taskstackbuilder; import android.content.context; import android.content.intent; import android.media.ringtonemanager; import android.os.bundle; import android.os.systemclock; import android.provider.settings; import android.support.v4.app.notificationcompat; import android.util.log; import android.widget.toast;  public class gcmintentservice extends intentservice {      public static final int notification_id = 1;     private static final string tag = "gcmintentservice";     private notificationmanager mnotificationmanager;     notificationcompat.builder builder;     context context;     public static final int notifyid = 9001;     string msg1;     string msg2;      public gcmintentservice() {         super("gcmintentservice");     }      @override     protected void onhandleintent(intent intent) {         bundle extras = intent.getextras();         googlecloudmessaging gcm = googlecloudmessaging.getinstance(this);         string msg1 = intent.getstringextra("cat_name");         string msg2 = intent.getstringextra("message");     //    string msg = intent.getstringextra("message");     //    string msg = msg1 + ":" + msg2;         // getmessagetype() intent parameter must intent received         // in broadcastreceiver.         string messagetype = gcm.getmessagetype(intent);          if (!extras.isempty()) {  // has effect of unparcelling bundle             /*              * filter messages based on message type. since gcm              * extended in future new message types, ignore              * message types you're not interested in, or don't              * recognize.              */             if (googlecloudmessaging.                     message_type_send_error.equals(messagetype)) {                 sendnotification("send error: " + extras.tostring());             } else if (googlecloudmessaging.                     message_type_deleted.equals(messagetype)) {                 sendnotification("deleted messages on server: " +                         extras.tostring());             // if it's regular gcm message, work.             } else if (googlecloudmessaging.                     message_type_message.equals(messagetype)) {                 // loop represents service doing work.                 (int i=0; i<5; i++) {                     log.i(tag, "working... " + (i+1)                             + "/5 @ " + systemclock.elapsedrealtime());                     try {                         thread.sleep(5000);                     } catch (interruptedexception e) {                     }                 }                 log.i(tag, "completed work @ " + systemclock.elapsedrealtime());                 // post notification of received message.             //    sendnotification(extras.getstring("notice"));                 sendnotification(msg1);                 log.i(tag, "received: " + extras.tostring());             }         }         // release wake lock provided wakefulbroadcastreceiver.         gcmbroadcastreceiver.completewakefulintent(intent);     }      private void sendnotification(string msg1) {       /*   intent resultintent = new intent(this, androidrssreader.class);         resultintent.putextra("message", msg);         pendingintent resultpendingintent = pendingintent.getactivity(this, 0,                 resultintent, pendingintent.flag_update_current);  */          intent resultintent = new intent(this, androidrssreader.class);         bundle b = new bundle();     //    b.putstring("message", msg);         b.putstring("cat_name", msg1);     //    resultintent.putextra("cat_name", msg1);         resultintent.putextras(b);         resultintent.addflags(intent.flag_activity_new_task | intent.flag_activity_single_top);         pendingintent resultpendingintent = pendingintent.getactivity(getapplicationcontext(), 0,                 resultintent, pendingintent.flag_update_current);          notificationcompat.builder mnotifybuilder;         notificationmanager mnotificationmanager;          mnotificationmanager = (notificationmanager) getsystemservice(context.notification_service);          mnotifybuilder = new notificationcompat.builder(this)            //     .setcontenttitle("alert")           //      .setcontenttext("you've received new message.")                 .setcontenttitle("")                 .setcontenttext(msg1)                 .setstyle(new notificationcompat.bigtextstyle().bigtext(msg1))                          .setsmallicon(r.drawable.gcm_cloud);         // set pending intent         mnotifybuilder.setcontentintent(resultpendingintent);          // set vibrate, sound , light         int defaults = 0;         defaults = defaults | notification.default_lights;         defaults = defaults | notification.default_vibrate;         defaults = defaults | notification.default_sound;          mnotifybuilder.setdefaults(defaults);         // set content notification     //    mnotifybuilder.setcontenttext("new message server");         // set autocancel         mnotifybuilder.setautocancel(true);         // post notification         mnotificationmanager.notify(notifyid, mnotifybuilder.build());     }     } 

and activity receiving string another, androidrss reader.java:

package com.andrija.bladimircodewp;  import java.io.ioexception; import java.net.malformedurlexception; import java.net.url;  import javax.xml.parsers.parserconfigurationexception; import javax.xml.parsers.saxparser; import javax.xml.parsers.saxparserfactory;  import org.xml.sax.inputsource; import org.xml.sax.saxexception; import org.xml.sax.xmlreader; import android.app.progressdialog; import android.app.listactivity; import android.content.context; import android.content.intent; import android.net.uri; import android.os.asynctask; import android.os.bundle; import android.util.log; import android.view.view; import android.widget.arrayadapter; import android.widget.listview; import android.widget.textview; import android.widget.toast;  public class androidrssreader extends listactivity {      private rssfeed myrssfeed = null; //    textview mojtext = null;  //  public string msg1 = "katarina";       /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.mainrss);      //    mojtext = (textview)findviewbyid(r.id.moj_text);         bundle extras = getintent().getextras();     //     if(extras != null){         //    string msg = extras.getstring("message");          string msg1 = extras.getstring("cat_name");         //    mojtext.settext("evo titla : " + msg);         //    toast.maketext(androidrssreader.this, msg1, toast.length_long).show();         //     new mytask().execute();              mytask task = new mytask();             task.msg1 = extras.getstring("cat_name");             task.execute();         //    }      }        private class mytask extends asynctask<void, void, void>{          public string msg1;          public mytask (string msg1) {             this.msg1 = msg1;         }          @override          protected void doinbackground(void... arg0) {              try {         //  url rssurl = new url("http://160.99.61.22/pushapp/category/katarina/feed/");               url rssurl = new url("http://160.99.61.22/pushapp/category/" + msg1 + "/feed/");                 saxparserfactory mysaxparserfactory = saxparserfactory.newinstance();                 saxparser mysaxparser = mysaxparserfactory.newsaxparser();                 xmlreader myxmlreader = mysaxparser.getxmlreader();                 rsshandler myrsshandler = new rsshandler();                 myxmlreader.setcontenthandler(myrsshandler);                 inputsource myinputsource = new inputsource(rssurl.openstream());                 myxmlreader.parse(myinputsource);                  myrssfeed = myrsshandler.getfeed();              } catch (malformedurlexception e) {                 e.printstacktrace();                 } catch (parserconfigurationexception e) {                 e.printstacktrace();                 } catch (saxexception e) {                 e.printstacktrace();             } catch (ioexception e) {                 e.printstacktrace();                 }              return null;          }            @override         protected void onpostexecute(void result) {             if (myrssfeed!=null)             {                 textview feedtitle = (textview)findviewbyid(r.id.feedtitle);                 textview feedsadrzajposta = (textview)findviewbyid(r.id.feedsadrzaj_posta);                 textview feedpubdate = (textview)findviewbyid(r.id.feedpubdate);                 textview feedlink = (textview)findviewbyid(r.id.feedlink);                 feedtitle.settext(myrssfeed.gettitle());                 feedsadrzajposta.settext(myrssfeed.getsadrzajposta());                 feedpubdate.settext(myrssfeed.getpubdate());                 feedlink.settext(myrssfeed.getlink());                  arrayadapter<rssitem> adapter =                         new arrayadapter<rssitem>(getapplicationcontext(),                                 r.layout.list_black_text,r.id.list_content,myrssfeed.getlist());                 setlistadapter(adapter);                  toast.maketext(getapplicationcontext(), "ggg: " + msg1, toast.length_short).show();               }else{                    textview textempty = (textview)findviewbyid(android.r.id.empty);                 textempty.settext("no feed found!");             }              super.onpostexecute(result);         }      }        @override     protected void onlistitemclick(listview l, view v, int position, long id) {         // todo auto-generated method stub         intent intent = new intent(this,showdetails.class);         bundle bundle = new bundle();         bundle.putstring("keytitle", myrssfeed.getitem(position).gettitle());         bundle.putstring("keysadrzajposta", myrssfeed.getitem(position).getsadrzaj_posta());         bundle.putstring("keylink", myrssfeed.getitem(position).getlink());         bundle.putstring("keypubdate", myrssfeed.getitem(position).getpubdate());         intent.putextras(bundle);         startactivity(intent);     } } 

why in doinbackground part of asynctask string msg1 null?

pass param async task instead, below:

mytask task = new mytask(); t.doinbackground("hello");  private class mytask extends asynctask<string, void, void> {     @override     protected void doinbackground(string... params)     {         string msg1 = params[0];         return null;     } }