package android.animation; public class Animator { public interface AnimatorListener { public abstract void onAnimationEnd (Animator animation); } private AnimatorListener listener; public void setTarget(Object target) {} public void start() { if (listener != null) listener.onAnimationEnd(this); } public void addListener(AnimatorListener listener) { this.listener = listener; } public void cancel() {} public long getStartDelay() { return 0; } public long getDuration() { return 0; } public Animator setDuration(long duration) { return this; } }