animations

class MainActivity : AppCompatActivity() {

    val fadeAnimator by lazy {
        ObjectAnimator.ofFloat(targetImage,"alpha",1.0f,0.0f)
            .apply {duration=1500}
            .apply { repeatCount=1 }
            .apply { repeatMode=ObjectAnimator.REVERSE }

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

        handleButtonClicks()
    }

    private fun handleButtonClicks() {
        rotate_button.setOnClickListener { startAnimation(R.animator.rotate, targetImage) }
        fade_button.setOnClickListener { /*startAnimation(R.animator.alpha, targetImage) */
        fadeAnimator.start()}
        translate_button.setOnClickListener { startAnimation(R.animator.translate, targetImage) }
        scale_button.setOnClickListener { startAnimation(R.animator.scale, targetImage) }
    }

    fun Context.startAnimation(srcId: Int, target: Any) = AnimatorInflater.loadAnimator(this, srcId)
        .apply { setTarget(target) }
        .start()
}