gistfile1.txt

        
fun ViewPropertyAnimator.setListener(init: ViewPropertyAnimator.() -> Unit) {
    this.init()
}

inline fun ViewPropertyAnimator.onAnimationEnd(crossinline continuation: (Animator) -> Unit) {
    setListener(object : AnimatorListenerAdapter() {
        override fun onAnimationEnd(animation: Animator) {
            continuation(animation)
        }
    })
}

inline fun ViewPropertyAnimator.onAnimationStart(crossinline continuation: (Animator) -> Unit) {
    setListener(object : AnimatorListenerAdapter() {
        override fun onAnimationStart(animation: Animator) {
            continuation(animation)
        }
    })
}



fab.animate()
  .alpha(0f)
  .setListener {
                  onAnimationStart {
                       // bla bla
                  }
                  onAnimationEnd {
                        // bla bla
                  }
               }


fab.animate().onAnimationEnd {
       // bla bla
}