How to notify user through Launcher Icon overlay

Hey all,

1开发者_运维问答). Best way to notify user when application is focused(Note: redirection is required means a button click) and even when application is not focused

2). Guidance for notifying user through making changes in Launcher Icon(Like happens in many iPhone Apps and Android Apps as well), overlay kind of thing, an incremented number or something..

Thanks in advance..

Best way to notify user when application is focused

Update the UI of the activity.

and even when application is not focused

Use a Notification.

Guidance for notifying user through making changes in Launcher Icon

That is not possible on Android AFAIK.