content: package com.rsen.github.easyandroidanimations;
  
  import android.animation.Animator;
  import android.animation.AnimatorListenerAdapter;
  import android.animation.AnimatorSet;
  import android.animation.ObjectAnimator;
  import android.animation.TimeInterpolator;
  import android.view.View;
  import android.view.animation.AccelerateDecelerateInterpolator;
  
  /**
   * This animation scales out the view from 1 to 0. On animation end, the view is
   * restored to its original state and is set to <code>View.INVISIBLE</code>.
   * 
   * @author SiYao
   * 
   */
  public class ScaleOutAnimation extends Animation implements Combinable {
  
  	TimeInterpolator interpolator;
  	long duration;
  	AnimationListener listener;
  
  	/**
  	 * This animation scales out the view from 1 to 0. On animation end, the
  	 * view is restored to its original state and is set to
  	 * <code>View.INVISIBLE</code>.
  	 * 
  	 * @param view
  	 *            The view to be animated.
  	 */
  	public ScaleOutAnimation(View view) {
  		this.view = view;
  		interpolator = new AccelerateDecelerateInterpolator();
  		duration = DURATION_LONG;
  		listener = null;
  	}
  
  	@Override
  	public void animate() {
  		getAnimatorSet().start();
  	}
  
  	@Override
  	public AnimatorSet getAnimatorSet() {
  		final float originalScaleX = view.getScaleX(), originalScaleY = view
  				.getScaleY();
  		AnimatorSet scaleSet = new AnimatorSet();
  		scaleSet.playTogether(ObjectAnimator.ofFloat(view, View.SCALE_X, 0f),
  				ObjectAnimator.ofFloat(view, View.SCALE_Y, 0f));
  		scaleSet.setInterpolator(interpolator);
  		scaleSet.setDuration(duration);
  		scaleSet.addListener(new AnimatorListenerAdapter() {
  
  			@Override
  			public void onAnimationEnd(Animator animation) {
  				view.setVisibility(View.INVISIBLE);
  				view.setScaleX(originalScaleX);
  				view.setScaleY(originalScaleY);
  				if (getListener() != null) {
  					getListener().onAnimationEnd(ScaleOutAnimation.this);
  				}
  			}
  		});
  		return scaleSet;
  	}
  
  	/**
  	 * @return The interpolator of the entire animation.
  	 */
  	public TimeInterpolator getInterpolator() {
  		return interpolator;
  	}
  
  	/**
  	 * @param interpolator
  	 *            The interpolator of the entire animation to set.
  	 */
  	public ScaleOutAnimation setInterpolator(TimeInterpolator interpolator) {
  		this.interpolator = interpolator;
  		return this;
  	}
  
  	/**
  	 * @return The duration of the entire animation.
  	 */
  	public long getDuration() {
  		return duration;
  	}
  
  	/**
  	 * @param duration
  	 *            The duration of the entire animation to set.
  	 * @return This object, allowing calls to methods in this class to be
  	 *         chained.
  	 */
  	public ScaleOutAnimation setDuration(long duration) {
  		this.duration = duration;
  		return this;
  	}
  
  	/**
  	 * @return The listener for the end of the animation.
  	 */
  	public AnimationListener getListener() {
  		return listener;
  	}
  
  	/**
  	 * @param listener
  	 *            The listener to set for the end of the animation.
  	 * @return This object, allowing calls to methods in this class to be
  	 *         chained.
  	 */
  	public ScaleOutAnimation setListener(AnimationListener listener) {
  		this.listener = listener;
  		return this;
  	}
  
  }
  