Expand/Collapse Lollipop toolbar animation (Telegram app)

Question

I\'m trying to figure out how the expand/collapse animation of the toolbar is done. If you have a look at the Telegram app settings, you will see that there is a listview an

Answer 1

Also check out CollapsingTitleLayout written by Chris Banes in Android team: https://plus.google.com/+ChrisBanes/posts/J9Fwbc15BHN

Code: https://gist.github.com/chrisbanes/91ac8a20acfbdc410a68