//from the example in https://facebook.github.io/react-native/docs/animations.html
componentDidMount() {

   //look ma, you're changing a stateful value directly!
   this.state.bounceValue.setValue(1.5);

   //not sure how this works under the hood, but it looks to be doing the same thing
   Animated.spring(this.state.bounceValue, {
    toValue: 0.8,
    friction: 1,
   }).start()
}