service - Android How to stop AlarmManager in other Activity -

i using service called in activity 'a' repeatedly created alarmmanager. service checking repeatedly response server, when response true new activity b started. when activity b started want stop service alarmmanager. how can this??

my 'a' activity code calling service following

    calendar cal = calendar.getinstance();     cal.add(calendar.second, 40);      intent intent = new intent(this, response.class);      // add extras bundle     intent.putextra("foo", "bar");     // start service     // startservice(intent);      pintent = pendingintent.getservice(this, 0, intent, 0);      alarm = (alarmmanager) getsystemservice(context.alarm_service);     int i;     = 15;     alarm.setrepeating(alarmmanager.rtc_wakeup, cal.gettimeinmillis(),             * 1000, pintent);      startservice(intent); 

i have tried code snippet in activity 'b' stop alarmmanager fail

      intent sintent = new intent(this, response.class);      pintent = pendingintent.getservice(this, 0, sintent, 0);      alarm = (alarmmanager) getsystemservice(context.alarm_service);      stopservice(sintent);      alarm.cancel(pintent); 

in activity b should create sintent same context created in activity a.

so in activity add this

private static context context;  public static context getappcontext(){     return activitya.context; } 

and inside oncreate() method of activity a, initialize context

context=getapplicationcontext(); 

and in activity b create sintent this:

intent intent = new intent(activitya.getappcontext(), serviceclass.class); intent.putextra("fsasf", "bar"); pendingintent pintent = pendingintent.getservice(this, 0, intent, 0); alarmmanager alarm = (alarmmanager) getsystemservice(context.alarm_service); stopservice(intent); alarm.cancel(pintent);