android - start service which repeat at top of every hour and fetch information at fixed time interval -


i have setting repeated alarm manager start service fetch location , send sms writing time duration in file check alarm accuracy .

i find alarm manager not working fine , set 1 hours interval fired @ 30 min. interval . left day , find after 12'o clock alarm accuracy right. happening ??

my activity class start alarm :

enter code here           public static final long alarm_trigger_at_time = systemclock.elapsedrealtime() + 20000;          public static final long alarm_interval = 1000 * 60 * 60 ;           alarmmanager alarmmanager = (alarmmanager)getsystemservice(alarm_service);           intent myintent = new intent(automainactivity.this, trackerservice.class);           pendingintent = pendingintent.getservice(automainactivity.this, 0, myintent, 0);           alarmmanager.setrepeating(alarmmanager.elapsed_realtime_wakeup,alarm_trigger_at_time, 1000 * 60 * 60,pendingintent);

and service class : 

traceservice :    public void onstart(intent intent, int startid) {     super.onstart(intent, startid);      //writing in file view time     java.util.date systemdates = calendar.getinstance().gettime();      simpledateformat = new simpledateformat("yyyy-mm-dd-hh:mm:ss");     currenttime = simpledateformat.format(systemdates);              // create file , write current time     generatenoteonsd("onstart"+currenttime+"\n","onstart.txt");   }

after executing apps @ 3:18 pm time .the file created service show alarm time . check :

alarm manager time

onstart2013-05-13-15:18:26

onstart2013-05-13-15:21:58

onstart2013-05-13-15:54:21

onstart2013-05-13-16:18:25

onstart2013-05-13-17:18:26

onstart2013-05-13-17:49:21

onstart2013-05-13-18:18:25

onstart2013-05-13-19:18:28

onstart2013-05-13-20:10:51

onstart2013-05-13-20:18:29

onstart2013-05-13-20:48:49

onstart2013-05-13-21:18:30

onstart2013-05-13-21:58:58

onstart2013-05-13-22:18:38

onstart2013-05-13-22:56:00

onstart2013-05-13-23:18:43

onstart2013-05-13-23:48:49

onstart2013-05-14-00:18:44

onstart2013-05-14-01:18:45

onstart2013-05-14-02:18:45

onstart2013-05-14-03:18:45

onstart2013-05-14-04:18:45

onstart2013-05-14-05:18:44

onstart2013-05-14-06:18:44

onstart2013-05-14-07:18:44

you can check when alarm manager start @ 15:18 pm , start again after 30 min. approx. after 12'o clock work fine !!! how fix it. need alarm start every 1 hour not before .

try alarmmanager.rtc_wakeup once instead of alarmmanager.elapsed_realtime_wakeup there example in : alarm manager example


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