At which stage of the Activity lifecycle will you implement animation handling through callbacks?

Working with animations through callbacks in an Activity is usually implemented in the lifecycle methods where the UI is already ready for display and interaction with the user. Most often, these are:

• onStart() — when the Activity becomes visible, animations can be started.
• onResume() — when the Activity comes to the foreground and is ready for interaction.

Using callbacks allows reacting to animation events (start, end, repeat) and performing additional actions, such as starting the next animation or changing the UI state.

Example:

val animation = AnimationUtils.loadAnimation(this, R.anim.fade_in)
animation.setAnimationListener(object : Animation.AnimationListener {
    override fun onAnimationStart(animation: Animation?) {
        // Actions at the start of the animation
    }
    override fun onAnimationEnd(animation: Animation?) {
        // Actions after the animation ends
    }
    override fun onAnimationRepeat(animation: Animation?) {}
})

override fun onStart() {
    super.onStart()
    myView.startAnimation(animation)
}

Thus, animation callbacks are usually implemented in onStart() or onResume() to ensure that the UI is ready for display.