Tested on
Model number : Micromax A290
Android version : 4.4.2

FloatingActionButton sample is not working for animated fab menu on Android 4.4.2. It was working fine on FloatingActionButton version 1.5.0.
Root cause :
In version 1.5.1, mMenuOpened = true is moved inside the postDelay(). On Android version 4.4.2 OnLayout() gets called for each item after fab.show(animated) and there is a mMenuOpened check for fab item that hides the fab menu button.