android - How to make whatsapp type of animation for opening the menu from toolbar(actionbar) -


description:

  1. i updated whatsapp , noticed animation menu item clicked on toolbar. how achieve effect?
  2. are there opensource projects achieve this?
  3. i have not posted code because. have no clue how doing it.

snapshot-1 : before clicking attachment button in menu img

snapshot-2 : after clicking attachment button in menu

img2

how achieve this?

seems "ported" lollipop animation in pre-l devices. simplest way using libraries igvalle's material-animation (see #4). minsdk 16, hope can decrease 14 or below.

some other libraries: transitionsbackport, prelollipoptransition, transitions-everywhere.

please let me know if create animation!


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