Animate FAB to show programatically.

FabUtility.kt

 import android.support.design.widget.FloatingActionButton
 import android.view.View
 import android.view.ViewTreeObserver
 
 fun FloatingActionButton.showWithAnimation(delay: Int = 200) {
 	visibility = View.INVISIBLE
 	scaleX = 0.0f
 	scaleY = 0.0f
 	alpha = 0.0f
 	viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
 		override fun onPreDraw(): Boolean {
 			viewTreeObserver.removeOnPreDrawListener(this)
 			postDelayed({ show() }, delay.toLong())
 			return true
		}
 	})
 } 

Nice notes about automatic animations here: https://www.codementor.io/tips/7812274333/android-adding-simple-animations-while-setvisibility-view-gone