Android :: Stop Services And Alarms When Application Ends

I have an application that consist of several Activities. When the application starts, some alarms are scheduled using AlarmManager and some services are started:
AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
a.setInexactRepeating(...)....

I would like to know any way to guarantee every service is stopped and every alarm is unscheduled when the user exits the application. The problem is that the user can leave the application from different Activities, and I don't like the idea of overriding the onDestroy method in every Activity. Is there any known Intent I can receive when the application ends? I've also found that an Android application can have a class that extends from Application, with a onTerminate method:

public class MyApplication extends Application {
@Override public void onTerminate() {
... } }

But the documentation is very clear: "never depend on this method being called; in many cases an unneeded application process will simply be killed by the kernel without executing any application code".