android - Set some Alarm Manager -

i want set working alarm manager. want start alarm manager in 11 a.m , after call stop alarm manager in 11:10 , again start alarm in 11:15 , continue this. think not working code. need alarm manager object setting alarm?

what problem? have advise me?

 protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.managedatamenu_activity);      am=(alarmmanager)this.getsystemservice(context.alarm_service);      start(9,50);     stop(9,52);     start(9,53);     stop(9,54);     start(11,13);     stop(11,15);      //setalarm();     inititems(); }   private void start(int hour,int min){     //first start     calendar calendar=calendar.getinstance();     calendar.settimeinmillis(system.currenttimemillis());     calendar.set(calendar.hour_of_day,hour);     calendar.set(calendar.minute,min);      intent intent=new intent(this,alarmmanagerbroadcastreceiver.class);     intent.putextra("start","start");     pi=pendingintent.getbroadcast(this,0,intent,0);     am.setrepeating(alarmmanager.rtc_wakeup,system.currenttimemillis(),alarmmanager.interval_day,pi); }  private void stop(int hour,int min){     //first start     calendar calendar=calendar.getinstance();     calendar.settimeinmillis(system.currenttimemillis());     calendar.set(calendar.hour_of_day,hour);     calendar.set(calendar.minute,min);      intent intent=new intent(this,alarmmanagerbroadcastreceiver.class);     intent.putextra("stop","stop");     pi=pendingintent.getbroadcast(this,0,intent,0);     am.setrepeating(alarmmanager.rtc_wakeup,system.currenttimemillis(),alarmmanager.interval_day,pi); }