singleton - static AlarmManager in Android -

i'm developing simple tasks app in android , need create notifications via alarmmanager. problem have alarms should deleted -and notifications- aren't, decided -following posts such delete alarm alarmmanager using cancel() - android make alarmmanager static variable same instance can reached whole app. way i'm doing having following method in main class:

public static alarmmanager getalarmmanagerinstance() {         if (salarmmanager == null && scontext != null)             salarmmanager = (alarmmanager) scontext                     .getsystemservice(context.alarm_service);         return salarmmanager;     } 

and in the scontext variable instantiated way:

@override     protected void oncreate(bundle bundle) {         super.oncreate(bundle);         setcontentview(r.layout.activity_main);         scontext = this;         initactionbar();     } 

is idea create singleton pattern variable? there better approach?

thanks lot in advance.

android documentation says:

you not instantiate class directly; instead, retrieve through context.getsystemservice(context.alarm_service).

alarmmanager class provides access system alarm services.

this services running in system don't care them use alarmmanager interface interact them.

so each time need access service retrieve documentation says:

context.getsystemservice(context.alarm_service)