[android-developers] How does NotificationService work?

I Know there is a system service out there handling toast, notification. But how does it handle these events. In android.widget.Toast.java, I only found INotificationManager(which is defined by an aidl file) that handles it, I couldn't no found any class in android system implemented the interface,

[android-developers] How does NotificationService work?

I Know there is a system service out there handling toast, notification. But how does it handle these events. In android.widget.Toast.java, I only found INotificationService(which is defined by an aidl file) that handles it, I couldn't no found any class in android system implemented the interface,