java - How to set calendar for notification before 10 minutes of the event? -

i have created events. want set notification before 10 minutes of start time of event.

i have seen in google calendar have set this.

how can set calendar time before events?

here getting calendar instance , setting calendar.

  public void notification(calendar c) {      calendar cal  = calendar.getinstance();      int year =  cal.get(calendar.year);     int  month =  cal.get(calendar.month);     int  day = cal.get(calendar.date);     int  hour =   cal.get(calendar.hour_of_day);     int  minute =  cal.get(calendar.minute);          cal.set(calendar.hour_of_day, hour);         cal.set(calendar.minute, minute);         cal.set(calendar.second, 0);         cal.set(calendar.millisecond, 0);         cal.set(calendar.date, day);          notification = c.gettime();         notificationtime = df.format(notification);        // notifytime.settext(notificationtime);         toast.maketext(getapplicationcontext(), string.valueof(notification), toast.length_short).show();      intent intent = new intent(getbasecontext(),notificationreceiver.class);     pendingintent pendingintent = pendingintent.getbroadcast(getbasecontext(), rqs_1, intent, 0);     alarmmanager alarmmanager = (alarmmanager)getsystemservice(context.alarm_service);     alarmmanager.setinexactrepeating(alarmmanager.rtc_wakeup, c.gettimeinmillis(),             alarmmanager.interval_day *7, pendingintent);      componentname receiver = new componentname(getapplicationcontext(),notificationreceiver.class);     packagemanager pm = getapplicationcontext().getpackagemanager();      pm.setcomponentenabledsetting(receiver,             packagemanager.component_enabled_state_enabled,             packagemanager.dont_kill_app);  } 

thank you..