"Android has always put you in control when it comes to staying notified and connected. Now you can take action directly from the notifications shade," says Android's updated "What's New" page. Indeed, today's Jelly Bean announcement saw a number of improvements to the already handy notification system we've come to know and love in previous iterations of Android. Not only can the new notifications system display larger, richer notifications, developers can create actionable notification with interactive controls for telephony, music, and more.
With a new and improved Notification Builder, apps can create notifications with a height of up to 256dp.