Expand/Collapse Lollipop toolbar animation (Telegram app)

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 and the toolbar. When you scroll down, the toolbar collapse, and when you scroll up it expands. There is also the animation of the profile pic and the FAB. Does anyone have any clue on that?

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