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 causes the view to fade in and fade out a customizable number
   * of times.
   * 
   * @author SiYao
   * 
   */
  public class BlinkAnimation extends Animation {
  
  	int numOfBlinks, blinkCount = 0;
  	TimeInterpolator interpolator;
  	long duration;
  	AnimationListener listener;
  
  	/**
  	 * This animation causes the view to fade in and fade out a customizable
  	 * number of times.
  	 * 
  	 * @param view
  	 *            The view to be animated.
  	 */
  	public BlinkAnimation(View view) {
  		this.view = view;
  		numOfBlinks = 2;
  		interpolator = new AccelerateDecelerateInterpolator();
  		duration = DURATION_LONG;
  		listener = null;
  	}
  
  	@Override
  	public void animate() {
  		long singleBlinkDuration = duration / numOfBlinks / 2;
  		if (singleBlinkDuration == 0)
  			singleBlinkDuration = 1;
  		ObjectAnimator fadeOut = ObjectAnimator.ofFloat(view, View.ALPHA, 0), fadeIn = ObjectAnimator
  				.ofFloat(view, View.ALPHA, 1);
  		final AnimatorSet blinkAnim = new AnimatorSet();
  		blinkAnim.playSequentially(fadeOut, fadeIn);
  		blinkAnim.setInterpolator(interpolator);
  		blinkAnim.setDuration(singleBlinkDuration);
  		blinkAnim.addListener(new AnimatorListenerAdapter() {
  
  			@Override
  			public void onAnimationEnd(Animator animation) {
  				blinkCount++;
  				if (blinkCount == numOfBlinks) {
  					if (getListener() != null) {
  						getListener().onAnimationEnd(BlinkAnimation.this);
  					}
  				} else {
  					blinkAnim.start();
  				}
  			}
  		});
  		blinkAnim.start();
  	}
  
  	/**
  	 * @return The number of blinks.
  	 */
  	public int getNumOfBlinks() {
  		return numOfBlinks;
  	}
  
  	/**
  	 * @param numOfBlinks
  	 *            The number of blinks to set.
  	 * @return This object, allowing calls to methods in this class to be
  	 *         chained.
  	 */
  	public BlinkAnimation setNumOfBlinks(int numOfBlinks) {
  		this.numOfBlinks = numOfBlinks;
  		return this;
  	}
  
  	/**
  	 * @return The interpolator of the entire animation.
  	 */
  	public TimeInterpolator getInterpolator() {
  		return interpolator;
  	}
  
  	/**
  	 * @param interpolator
  	 *            The interpolator of the entire animation to set.
  	 */
  	public BlinkAnimation 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.
  	 */
  	public BlinkAnimation 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.
  	 */
  	public BlinkAnimation setListener(AnimationListener listener) {
  		this.listener = listener;
  		return this;
  	}
  
  }
  