How to implement push-up messages in android?

Question

Android

Hello.
Can't find information on implementing push-up notifications from the service? That is, the service does long polling and, if available, notifies the user about messages. This means displaying on the top status bar (where the battery is, etc.), and not using Toast.

Answer 1

It used to be c2dm, now it's like developer.android.com/google/gcm/index.html