android - background services stop when the app is closed via the BACK button -

a background service in android stops running when user exits app using button. same service works fine if app in foreground or in background (clicking home button).

there 3 cases:

1. keep app running: every 15 seconds notification shown (ok).
2. put app in background clicking home button: notifications keep showing (ok)
3. click button (this closes app): background service stopped , no more notifications shown (bug)

expected behavior

also in case #3, notifications should keep running every 15 seconds.

my entire source below

mainactivity.java

    package com.example.service_demo;  import android.app.activity; import android.app.activitymanager; import android.app.activitymanager.runningserviceinfo; import android.content.broadcastreceiver; import android.content.context; import android.content.intent; import android.content.intentfilter; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.textview; import android.widget.toast;  public class mainactivity extends activity implements onclicklistener {      private textview timervalue;     private button starttimer;     private button cancletimer;     intent i;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         mapview();      }      private void mapview() {          timervalue = (textview) findviewbyid(r.id.timertext);         starttimer = (button) findviewbyid(r.id.starttimer);         cancletimer = (button) findviewbyid(r.id.cancletimer);         starttimer.setonclicklistener(this);         cancletimer.setonclicklistener(this);     }      @override     protected void onresume() {         super.onresume();         = new intent(this, simpleservice.class);         if (ismyservicerunning()) {             toast.maketext(getbasecontext(), "service running,",                     toast.length_short).show();             registerreceiver(broadcastreceiver, new intentfilter(                     simpleservice.broadcast_action));             starttimer.setenabled(false);         } else {             toast.maketext(getbasecontext(), "there no service running",                     toast.length_short).show();         }      }      @override     public void onclick(view v) {         if (v == starttimer) {             starttimer.setenabled(false);             = new intent(this, simpleservice.class);             startservice(i);             registerreceiver(broadcastreceiver, new intentfilter(                     simpleservice.broadcast_action));         } else if (v == cancletimer) {             = new intent(this, simpleservice.class);             stopservice(i);             timervalue.settext("00:00:00");             starttimer.setenabled(true);          }     }      private broadcastreceiver broadcastreceiver = new broadcastreceiver() {         @override         public void onreceive(context context, intent intent) {              updateui(intent);         }      };      private void updateui(intent intent) {         string str = intent.getstringextra("textval");         timervalue.settext(str);      }      private boolean ismyservicerunning() {         activitymanager manager = (activitymanager) getsystemservice(context.activity_service);         (runningserviceinfo service : manager                 .getrunningservices(integer.max_value)) {             if (simpleservice.class.getname().equals(                     service.service.getclassname())) {                 return true;             }         }         return false;     }      @override     protected void onstop() {         // todo auto-generated method stub         super.onstop();         = new intent(this, simpleservice.class);         startservice(i);     }      @override     public void onbackpressed() {         // todo auto-generated method stub         super.onbackpressed();         system.exit(0); // system.exit(0) mendatory app can't                         // removed     }  } 

simpleservice

    package com.example.service_demo;  import java.util.timer; import java.util.timertask;  import android.os.binder; import android.os.bundle; import android.os.ibinder; import android.app.activity; import android.app.notification; import android.app.notificationmanager; import android.app.pendingintent; import android.app.service; import android.content.intent; import android.view.menu; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.toast;  public class simpleservice extends service {      private notificationmanager mnm;     private long starttime = 0l;     long timeinmilliseconds = 0l;     long timeswapbuff = 0l;     long updatedtime = 0l;     long basestart = system.currenttimemillis();     timer timer = new timer();     long timeswap = 0l;     int secs = 0;     int mins = 0;     int hour = 0;     intent intent;     string s;     public static final string broadcast_action = "com.example.service_demo.mainactivity";     private int notification = 1;      @override     public ibinder onbind(intent intent) {         return null;     }      @override     public void oncreate() {         super.oncreate();          mnm = (notificationmanager) getsystemservice(notification_service);         intent = new intent(broadcast_action);         toast.maketext(this, "service started", 2000).show();      }      @override     public int onstartcommand(intent intent, int flags, int startid) {          thread t = new thread(new runnable() {              @override             public void run() {                 timer.schedule(new remindtask(), 0, 1000);             }         });         t.start();          return service.start_not_sticky;      }      @override     public void ondestroy() {         super.ondestroy();          mnm.cancel(notification);          if (timer != null) {             timer.cancel();             timer.purge();             timer = null;         }         toast.maketext(this, "service stoped", 2000).show();     }      class remindtask extends timertask {          @override         public void run() {              timeinmilliseconds = system.currenttimemillis() - basestart;             timeswapbuff = timeswap;             updatedtime = timeswapbuff + timeinmilliseconds;              secs = (int) (updatedtime / 1000);             mins = secs / 60;             hour = mins / 60;              secs = secs % 60;             mins = mins % 60;              s = "" + string.format("%02d", hour) + ":" + ""                     + string.format("%02d", mins) + ":"                     + string.format("%02d", secs);             if (s.equalsignorecase("00:00:15")) {                 shownotification();             }             intent.putextra("textval", s);             sendbroadcast(intent);         }     }      private void shownotification() {         // in sample, we'll use same text ticker ,         // expanded notification         charsequence text = s;          // set icon, scrolling text , timestamp         @suppresswarnings("deprecation")         notification notification = new notification(r.drawable.ic_launcher,                 text, system.currenttimemillis());          // pendingintent launch our activity if user selects         // notification         pendingintent contentintent = pendingintent.getactivity(this, 0,                 new intent(this, mainactivity.class), 0);          // set info views show in notification panel.         notification.setlatesteventinfo(this, "notification label", text,                 contentintent);          // send notification.         mnm.notify(notification, notification);     }  } 

in method onstartcommand() of service, return start_sticky. service continue run until explicitly call stopself() in service or call stopservice() activity.