FloatingActionButton
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FAB lacks "lift on press"
Per the material spec, FABs should "lift" towards the surface of the screen when pressed. However, this library doesn't include such behavior. This would probably apply only to 5.x+ devices since they have the elevation API; since the shadow is drawn with a bitmap on pre-Lollipop devices, animating the elevated shadow would be difficult.
+1
This library is now deprecated.