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{

		@Override
		public void onClick(View v) {
			// load back animation  config
			Animation animation = AnimationUtils.loadAnimation(AnimationDemo.this, R.anim.back_scale);
			// bind AnimationListener
			animation.setAnimationListener(new AnimationListener() {	
				// Notifies the start of the animation.
				@Override
				public void onAnimationStart(Animation animation) {
					System.out.println("onAnimationStart.");
				}
				// Notifies the repetition of the animation.
				@Override
				public void onAnimationRepeat(Animation animation) {
					System.out.println("onAnimationRepeat");
				}
				// Notifies the end of the animation.
				@Override
				public 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 config
					img.setAnimation(AnimationUtils.loadAnimation(AnimationDemo.this, R.anim.front_scale));				
				}
			});
			// invoke animation immediately
			img.startAnimation(animation);
		}
    	
    }
}