code: public static void unregisterActivityLifecycleCallbacks(Application application, ActivityLifecycleCallbacksCompat callback) {
          if (PRE_ICS) {
              preIcsUnregisterActivityLifecycleCallbacks(callback);
          } else {
              postIcsUnregisterActivityLifecycleCallbacks(application, callback);
          }
      }
docs: Unregisters a previously registered callback.
  
  @param application The application with which to unregister the callback.
  @param callback    The callback to unregister.