Animation（三）
继续上篇的animation，本篇用到的是AnimationListener，参考自iteye上的一个朋友的翻牌动画。AnimationListener主要是用来监听animation的，它接受animation的通知，每个通知声明了一个相关的事件。话不多说，上代码：

package com.kevin.animation;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;import android.view.animation.AnimationUtils;import android.widget.ImageView;public class AnimationDemo extends Activity {private ImageView img;private boolean isFront = false;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        img = (ImageView)findViewById(R.id.imageView1);        // bind onclick event        img.setOnClickListener(new ImgOnClickListener());    }    class ImgOnClickListener implements OnClickListener{@Overridepublic void onClick(View v) {// load back animation  configAnimation animation = AnimationUtils.loadAnimation(AnimationDemo.this, R.anim.back_scale);// bind AnimationListeneranimation.setAnimationListener(new AnimationListener() {// Notifies the start of the animation.@Overridepublic void onAnimationStart(Animation animation) {System.out.println("onAnimationStart.");}// Notifies the repetition of the animation.@Overridepublic void onAnimationRepeat(Animation animation) {System.out.println("onAnimationRepeat");}// Notifies the end of the animation.@Overridepublic void onAnimationEnd(Animation animation) {System.out.println("onAnimationEnd");if(isFront){img.setImageResource(R.drawable.back);isFront = false;}else{img.setImageResource(R.drawable.front);isFront = true;}// load front animation configimg.setAnimation(AnimationUtils.loadAnimation(AnimationDemo.this, R.anim.front_scale));}});// invoke animation immediatelyimg.startAnimation(animation);}        }}