Android Automatically Update Notification Using Timer -

i want activity refresh display notification based on refreshed values every 5 minutes. got refresh button , it's working fine. when try activate refresh button before notification appears in timer. app crashes.

here codes

//oncreate

            if(ordercounter>0) //ordercounter updated value             {               mytimertask mytask = new mytimertask();                  timer mytimer = new timer();                 mytimer.schedule(mytask, 1, 300000);             } 

//timer

class mytimertask extends timertask {     public void run() {          refresh.performclick(); // line cause of error pls         generatenotification(getapplicationcontext(), "you have "+ ordercounter+ " pending orders!");     } }  private void generatenotification(context context, string message) {      int icon = r.drawable.ic_launcher;     long when = system.currenttimemillis();     string appname = context.getresources().getstring(r.string.app_name);     notificationmanager notificationmanager = (notificationmanager) context             .getsystemservice(context.notification_service);      notification notification;     pendingintent contentintent = pendingintent.getactivity(context, 0,             new intent(context, admin.class), 0);           notificationcompat.builder builder = new notificationcompat.builder(                 context);         notification = builder.setcontentintent(contentintent)                 .setsmallicon(icon).setticker(appname).setwhen(0)                 .setautocancel(true).setcontenttitle(appname)                 .setcontenttext(message).build();          notificationmanager.notify((int) when, notification);     } 

// refresh button

refresh.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {              intent intent = getintent();              intent.addflags(intent.flag_activity_no_animation);                 finish();                 startactivity(intent);          }     }); 

i think should use alarmmanager , set activated every 5 minutes:

intent intent = new intent(context, alarmreceiver.class); alarmintent = pendingintent.getbroadcast(context, 0, intent, 0);  alarmmgr.setinexactrepeating(alarmmanager.elapsed_realtime_wakeup,             millisecondstofirstactivation,             millisecondsforrepeatingschedule, alarmintent); 

the create broadcast receiver going display notification

public class myalarmreceiver extends broadcastreceiver {      @override      public void onreceive(context context, intent intent) {         displaynotification();     }  }  

you can find more info here: http://developer.android.com/training/scheduling/alarms.html