AnimationListener

AnimationListener is an interface in the Android SDK that provides callback methods for monitoring the progress of an animation. By implementing this interface, developers can receive notifications when an animation starts, repeats, or ends. This allows for dynamic updates to the UI or other application logic in response to animation events.

The AnimationListener interface has three methods: onAnimationStart, onAnimationEnd, and onAnimationRepeat. The onAnimationStart method is called when the animation begins to play. The onAnimationEnd method is invoked when the animation has completed its execution. The onAnimationRepeat method is called each time the animation restarts, which is relevant for animations configured to loop.

To use AnimationListener, a class typically implements the interface and then registers an instance of that class as a listener to an Animation object. For example, a View can have an Animation object attached to it, and the View can be set to listen for animation events. This mechanism is crucial for orchestrating complex visual sequences, synchronizing animations with other UI updates, or triggering actions once an animation has finished.

Common use cases for AnimationListener include fading in or out views, moving elements across the screen, or triggering subsequent animations after a previous one has concluded. It provides a clean and structured way to manage the lifecycle of animations within an Android application.