android - BroadcastService restart itself when app killed -

i using this broadcast service countdown timer. when kill app, not ticking on same time(second), starts again.

here code.

broadcastservice:

package com.example.emre.denemeprojesi;  import android.app.service; import android.content.intent; import android.os.countdowntimer; import android.os.ibinder; import android.util.log;  public class broadcastservice extends service {      private final static string tag = "broadcastservice";      public static final string countdown_br = "com.example.emre.denemeprojesi";     intent bi = new intent(countdown_br);      countdowntimer cdt = null;      @override     public void oncreate() {         super.oncreate();          log.i(tag, "starting timer...");         system.out.println("starting timer");          cdt = new countdowntimer(60000, 1000) {             @override             public void ontick(long millisuntilfinished) {                  log.i(tag, "countdown seconds remaining: " + millisuntilfinished / 1000);                 bi.putextra("countdown", millisuntilfinished);                 sendbroadcast(bi);             }              @override             public void onfinish() {                 log.i(tag, "timer finished");                 system.out.println("timer cancelled");             }         };          cdt.start();     }      @override     public void ondestroy() {         super.ondestroy();       }      @override     public int onstartcommand(intent intent, int flags, int startid) {         return super.onstartcommand(intent, flags, startid);     }      @override     public ibinder onbind(intent arg0) {         return null;     } } 

main activity:

package com.example.emre.denemeprojesi;  import android.content.broadcastreceiver; import android.content.context; import android.content.intent; import android.content.intentfilter; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.util.log; import android.widget.textview;  public class mainactivity extends appcompatactivity {      private string tag  ="countdown servisi";     private textview lblresult ;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         lblresult = (textview)findviewbyid(r.id.lbl_result);          startservice(new intent(this, broadcastservice.class));         log.i(tag, "started service");     }      private broadcastreceiver br = new broadcastreceiver() {         @override         public void onreceive(context context, intent intent) {             updategui(intent); // or whatever method used update gui fields         }     };      @override     public void onresume() {         super.onresume();         registerreceiver(br, new intentfilter(broadcastservice.countdown_br));         log.i(tag, "registered broacast receiver");     }      @override     public void onpause() {         super.onpause();         unregisterreceiver(br);        log.i(tag, "unregistered broacast receiver");     }      @override     public void onstop() {         try {             unregisterreceiver(br);         } catch (exception e) {             // receiver stopped in onpause()         }         super.onstop();     }     @override     public void ondestroy() {         super.ondestroy();        // stopservice(new intent(this, broadcastservice.class));         //log.i(tag, "stopped service");      }      private void updategui(intent intent) {         if (intent.getextras() != null) {             long millisuntilfinished = intent.getlongextra("countdown", 0);             system.out.println(millisuntilfinished); //<<<bu göstermiyor<<<<<<             log.i(tag, "countdown seconds remaining: " +  millisuntilfinished / 1000);             //         }     }   }