Animation FallUp

FluppyBirdView.kt

    var fallUpAnimation: ValueAnimator? = null

    private fun fallUp() {
        fallDawnAnimation.cancel()
        if (fallUpAnimation != null) {
            if (fallUpAnimation!!.isRunning) {
                fallUpAnimation!!.cancel()
            }
        }

        fallUpAnimation = ValueAnimator.ofInt(circle_height, circle_height - 350)
        with(fallUpAnimation!!) {
            duration = 450
            addUpdateListener {
                circle_height = it.animatedValue as Int
                invalidate()
            }
            addListener(object : AnimatorListenerAdapter() {
                override fun onAnimationEnd(animation: Animator?) {
                    fallDown()
                }
            })
            start()
        }
    }


    override fun onTouchEvent(event: MotionEvent?): Boolean {

        when (event?.action) {
            MotionEvent.ACTION_DOWN -> {
                fallUp()
            }
        }

        return super.onTouchEvent(event)
    }