Animated is very awesome.but there are some bugs in Animated.

the spring callback won`t be called at once the animation finished.
the callback has something like 200ms delay.

Animated.spring(
  this.state.height,
  {
    toValue: this._height,
    friction: 8,
    tension: 80
  }
).start(callback);

When using Animated.timing and set easing as Easing.back orEasing.elastic.
The element wont animate any more. It just jump to the last frame. Easing.inandEasing.inOut(Easing.ease)` works fine

Animated.timing(
this.state.height,
  {
    toValue: 0,
    easing: Easing.back, // or Easing.elastic
    duration: 200
  }
).start(callback);