Flipcard animation

MainActivity.kt

private lateinit var binding: ActivityMainBinding

    lateinit var front_animation: AnimatorSet
    lateinit var back_animation: AnimatorSet
    var isFront = false

    override fun onCreate(savedInstanceState: Bundle?) {
        val splashScreen = installSplashScreen()
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)

        // Now Create Animator Object
        // For this we add animator folder inside res
        // Now we will add the animator to our card
        // we now need to modify the camera scale
        val scale = applicationContext.resources.displayMetrics.density

        binding.cardFront.cameraDistance = 8000 * scale
        binding.cardBack.cameraDistance = 8000 * scale

        // Now we will set the front animation
        front_animation =
            AnimatorInflater.loadAnimator(applicationContext, R.animator.flip_in) as AnimatorSet
        back_animation =
            AnimatorInflater.loadAnimator(applicationContext, R.animator.flip_out) as AnimatorSet


        binding.flipButton.setOnClickListener {
            flipCard()
        }

        back_animation.doOnEnd { binding.flipButton.isClickable = true }
    }

    private fun flipCard() {

        binding.flipButton.isClickable = false

        if (isFront) {
            back_animation.setTarget(binding.cardBack)
            front_animation.setTarget(binding.cardFront)
            back_animation.start()
            front_animation.start()
        } else {
            back_animation.setTarget(binding.cardFront)
            front_animation.setTarget(binding.cardBack)
            front_animation.start()
            back_animation.start()
        }

        isFront = !isFront
    }