ma_progress.kt

class ExampleActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_example)

        motionLayout.setTransitionListener(MotionProgressListener { progress: Float ->
            arrow.isVisible = (progress <= 0.5f)
            editText.isVisible = (progress >= 0.5f)
        })
    }
}