android - Why the service starts on BOOT_COMPLETED but not with BATTERY_LOW? -

why service starts on boot_completed not battery_low? code:

myschedulereceiver.java

public class myschedulereceiver extends broadcastreceiver {       // restart service every 30 min     private static final long repeat_time = 30*1000*4;//1800000 ;      @override     public void onreceive(context context, intent intent) { intent service = new intent(context, service.class); context.startservice(service); }} 

service.java

public class service extends service {      notificationmanager mnotificationmanager;       @override public ibinder onbind(intent intent) {         // not used         return null;       }        @override public void oncreate() {         super.oncreate();   mnotificationmanager= (notificationmanager)getsystemservice(notification_service); checkpref(); } @override       public void ondestroy() {         super.ondestroy();        }  private void checkpref(){          notificationcompat.builder notificationbuilder = new notificationcompat.builder(                                 service.this);                 notificationbuilder.setcontenttitle("title");                 notificationbuilder.setcontenttext("context");                 notificationbuilder.setticker("tickertext");                 notificationbuilder.setwhen(system.currenttimemillis());                 notificationbuilder.setsmallicon(r.drawable.ic_stat_icon);                  intent notificationintent = new intent(this, service.class);                 pendingintent contentintent = pendingintent.getactivity(this, 0,                                 notificationintent, 0);                  notificationbuilder.setcontentintent(contentintent);                  notificationbuilder.setdefaults(notification.default_sound                                 | notification.default_lights | notification.default_vibrate);                  mnotificationmanager.notify(1,                                 notificationbuilder.build());     }   } 

and manifest

<uses-permission android:name="android.permission.receive_boot_completed"> <uses-permission android:name="android.permission.battery_stats"> <receiver android:name="myschedulereceiver" >      <intent-filter>          <action android:name="android.intent.action.battery_low" />      </intent-filter>   </receiver>  <service android:name="service" >  </service> 

well notification want show battery low doesn't appear.. if change action boot_completed , reboot device works..why?

look @ answer : https://stackoverflow.com/a/12348778/2508174

looks need programmaticaly subcribe intents too. , looks don't need battery_stats permission btw.

hope helps