android - Why isn't my AlarmManager working? -

i trying make alarm triggers event number of seconds now, 1 time, within dialogfragment.

here relevant code, put in oncreate():

broadcastreceiver = new broadcastreceiver() {     @override     public void onreceive(context c, intent i) {         toast.maketext(c, "rise , shine!", toast.length_long).show();     } }; getactivity().registerreceiver(broadcastreceiver, new intentfilter(alarm_manager_tag) ); pendingintent = pendingintent.getbroadcast(getactivity(), 0, new intent(alarm_manager_tag), 0 ); alarmmanager = (alarmmanager)(getactivity().getsystemservice( context.alarm_service )); 

and when press start button:

alarmmanager.set(alarmmanager.elapsed_realtime_wakeup, timestampend, pendingintent); 

in case timestampend = system.currenttimemillis() + 10 * 1000;, 10 seconds.

and have overridden destroy:

@override public void ondestroy() {     alarmmanager.cancel(pendingintent);     getactivity().unregisterreceiver(broadcastreceiver);     super.ondestroy(); } 

and yet, nothing happens reason.

you're passing alarmmanager.elapsed_realtime_wakeup, means alarmmanager going use systemclock.elapsedrealtime() when checking timestamps. since you're passing calculated off of system.currenttimemillis(), going have wait 47 years before alarm fires.

either change first argument alarmmanager.rtc_wakeup or change timestamp calculated off of systemclock.elapsedrealtime().