I'm trying to see if any in-build animation exist on the design library to create floating action button transforming into single material sheet like shown in the material design image
Have you tried https://github.com/gowong/material-sheet-fab, it's part of the Android arsenal?
来源：https://stackoverflow.com/questions/33093198/how-to-create-floating-action-button-transforming-into-a-single-sheet-of-materia