java - android notification comes up on start -

i m trying create app, schedule notification whenever try open app, notification comes up..... comes @ right time when app opened. here's code............

main activity.java

public class mainactivity extends activity {  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      calendar calendar_object = calendar.getinstance();        calendar_object.set(calendar.hour_of_day,16);     calendar_object.set(calendar.minute,18);     calendar_object.set(calendar.second,00);      intent myintent = new intent(mainactivity.this, alarmreceiver.class);   pendingintent pendingintent = pendingintent.getbroadcast(mainactivity.this,         0, myintent,0);  alarmmanager alarmmanager = (alarmmanager)getsystemservice(context.alarm_service);    alarmmanager.setrepeating(alarmmanager.rtc_wakeup, calendar_object.gettimeinmillis(),120000,pendingintent);   } } 

alarmreceiver.java

 public class alarmreceiver extends broadcastreceiver {   @override    public void onreceive(context context, intent intent) {    intent myintent = new intent(context, notificationservice.class);   context.startservice(myintent); }  }  

notificationservice.java

public class notificationservice extends service {  private notificationmanager mmanager;  @override public ibinder onbind(intent arg0) {      return null; }  @override public void oncreate() {     super.oncreate();  }     @override public void onstart(intent intent, int startid) {     super.onstart(intent, startid);      mmanager = (notificationmanager) this.getapplicationcontext()             .getsystemservice(                     this.getapplicationcontext().notification_service);      intent intent1 = new intent(this.getapplicationcontext(), mainactivity.class);      @suppresswarnings("deprecation")     notification notification = new notification(r.drawable.images,             "xys", system.currenttimemillis());      intent1.addflags(intent.flag_activity_single_top             | intent.flag_activity_clear_top);       notification.defaults |= notification.default_sound;     notification.defaults |= notification.default_vibrate;       pendingintent pendingnotificationintent = pendingintent.getactivity(             this.getapplicationcontext(), 0, intent1,             pendingintent.flag_one_shot);     notification.flags |= notification.flag_auto_cancel;      notification.setlatesteventinfo(this.getapplicationcontext(),             "xyz", "abcd",             pendingnotificationintent);     notification.flags|= notification.flag_auto_cancel;      mmanager.notify(0, notification);      stopself();     } 

alarm triggering again because after notification calling mainactivity in setting alarm again. try set alarm in different activity. else prevent alarm setting if activity started after notification.