A gist that shows how transitionListener looks like

MotionLayoutExample.kt

binding.motionLayoutRoot.setTransitionListener(object : MotionLayout.TransitionListener {
       override fun onTransitionTrigger(p0: MotionLayout?, startId: Int, endId: Boolean, p3: Float) {}

        override fun allowsTransition(p0: MotionScene.Transition?): Boolean {}

        override fun onTransitionStarted(p0: MotionLayout?, startId: Int, endId: Int) {}

        override fun onTransitionChange(p0: MotionLayout?, startId: Int, endId: Int, progress: Float) {}

        override fun onTransitionCompleted(p0: MotionLayout?, endId: Int) {}
        
        })