the collapsing toolbar must expand to full screen when pulled down and must scroll back to intermediate position when pulled up (even slightly). and it must act normal when scrolled up as toolbar does.
i want to learn making ui like video in link given below please help what should i learn and do in order to achieve this ui:
https://drive.google.com/open?id=0B14wNBitoI33MUhWM05FYTZ2czQ