Returns the smoothing type for the animation. This setting affects the rate of change in the animation's progress value as it plays.
smoothType- Type of smoothing for the animation (
IN- Initially progressing slowly and accelerating towards the end
IN_OUT- Initially progressing slowly and accelerating towards the middle, then slowing down towards the end
NONE- Progresses at a constant rate from beginning to end
OUT- Initially progressing quickly and slowing towards the end