Useful Android Kotlin Extension functions to easily change the visibility of a View

ViewVisibilityExtensions.kt

/** Set the View visibility to VISIBLE and eventually animate the View alpha till 100% */
fun View.visible(animate: Boolean = true) {
    if (animate) {
        animate().alpha(1f).setDuration(300).setListener(object : AnimatorListenerAdapter() {
            override fun onAnimationStart(animation: Animator) {
                super.onAnimationStart(animation)
                visibility = View.VISIBLE
            }
        })
    } else {
        visibility = View.VISIBLE
    }
}

/** Set the View visibility to INVISIBLE and eventually animate view alpha till 0% */
fun View.invisible(animate: Boolean = true) {
    hide(View.INVISIBLE, animate)
}

/** Set the View visibility to GONE and eventually animate view alpha till 0% */
fun View.gone(animate: Boolean = true) { 
    hide(View.GONE, animate)
}

/** Convenient method that chooses between View.visible() or View.invisible() methods */
fun View.visibleOrInvisible(show: Boolean, animate: Boolean = true) {
    if (show) visible(animate) else invisible(animate)
}

/** Convenient method that chooses between View.visible() or View.gone() methods */
fun View.visibleOrGone(show: Boolean, animate: Boolean = true) {
    if (show) visible(animate) else gone(animate)
}

private fun View.hide(hidingStrategy: Int, animate: Boolean = true) {
    if (animate) {
        animate().alpha(0f).setDuration(300).setListener(object : AnimatorListenerAdapter() {
            override fun onAnimationEnd(animation: Animator) {
                super.onAnimationEnd(animation)
                visibility = hidingStrategy
            }
        })
    } else {
        visibility = hidingStrategy
    }
}

Nice! Some nitpicks:

You could make invisible and gone just call hide to don't repeat so much code.
Having invisible and gone you don't need to expose hide, so you could make it private. Also its javadoc is wrong.
Same for visibleOrHide

Thanks for the tips! I updated the gist!

Hi, guys! I am pretty new to android. Could you say please how to use it?)

Thank you for the gist!!