How to create a status bar icon on the right side? (Android)

Question

Notification and NotificationManager are used to create icons to be placed on the top-left position of the screen. A Notification also need to have an entry on the status bar pull-down.

However, icons on the right side such as the battery, signal strength, wireless indicators do not need any entry on the status bar.

How do I make such icons without any entry in the status bar pull-down?

Answer 1

I believe the right side area of the notification bar is reserved for the OS.