主AC包含各种API:

package com.example.tween;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.AnimationSet;import android.view.animation.AnimationUtils;import android.view.animation.RotateAnimation;import android.view.animation.ScaleAnimation;import android.view.animation.TranslateAnimation;import android.widget.ImageView;public class MainActivity extends Activity {    private ImageView iv;    @Override    protected void onCreate(Bundle savedInstanceState) {	super.onCreate(savedInstanceState);	setContentView(R.layout.activity_main);	iv=(ImageView) findViewById(R.id.iv);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {	// Inflate the menu; this adds items to the action bar if it is present.	getMenuInflater().inflate(R.menu.main, menu);	return true;    }    /**     * 透明度     * @param v     */    public void click1(View v)    {	AlphaAnimation animation=new AlphaAnimation(0.0f,1.0f);	//动画播放时间	animation.setDuration(2000);	//重复几次 一个3次	animation.setRepeatCount(2);	animation.setRepeatMode(AlphaAnimation.REVERSE);	iv.startAnimation(animation);    }        /**     * 缩放     * @param v     */    public void click2(View v)    {        //参数含义很简单 开始x比例 最终x比例 开始Y比例……缩放中心的类型，缩放中心位置（比例）	ScaleAnimation animation=new ScaleAnimation(0.2f, 2.0f, 0.2f, 2.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);		//动画播放时间	animation.setDuration(2000);	//重复几次 一个3次	animation.setRepeatCount(2);	animation.setRepeatMode(Animation.REVERSE);	iv.startAnimation(animation);    }        /**     * 旋转     * @param v     */    public void click3(View v)    {	RotateAnimation animation=new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);	//动画播放时间	animation.setDuration(2000);	//重复几次 一个3次	animation.setRepeatCount(2);	animation.setRepeatMode(Animation.REVERSE);	iv.startAnimation(animation);    }        /**     * 平移     * @param v     */    public void click4(View v)    {	TranslateAnimation animation=		new TranslateAnimation		(Animation.RELATIVE_TO_PARENT, 0.2f, Animation.RELATIVE_TO_PARENT, 1.0f, Animation.RELATIVE_TO_PARENT, 0.2f, Animation.RELATIVE_TO_PARENT, 1.0f);	//动画播放时间	animation.setDuration(2000);	//重复几次 一个3次	animation.setRepeatCount(2);	animation.setRepeatMode(Animation.REVERSE);	iv.startAnimation(animation);    }        /**     * 组合     * @param v     */    public void click5(View v)    {	AnimationSet animationSet=new AnimationSet(false);		RotateAnimation ra=new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);	//动画播放时间		ra.setDuration(2000);		//重复几次 一个3次		ra.setRepeatCount(2);		ra.setRepeatMode(Animation.REVERSE);	TranslateAnimation ta=		new TranslateAnimation		(Animation.RELATIVE_TO_PARENT, 0.2f, Animation.RELATIVE_TO_PARENT, 0.5f, Animation.RELATIVE_TO_PARENT, 0.2f, Animation.RELATIVE_TO_PARENT, 0.5f);	//动画播放时间		ta.setDuration(2000);		//重复几次 一个3次		ta.setRepeatCount(2);		ta.setRepeatMode(Animation.REVERSE);	ScaleAnimation sa=new ScaleAnimation(0.2f, 2.0f, 0.2f, 2.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);	//动画播放时间		sa.setDuration(2000);		//重复几次 一个3次		sa.setRepeatCount(2);		sa.setRepeatMode(Animation.REVERSE);		animationSet.addAnimation(ra);		animationSet.addAnimation(ta);		animationSet.addAnimation(sa);	iv.startAnimation(animationSet);    }        /**     * XMl文件指定动画     * @param v     */    public void click6(View v)    {	iv.startAnimation(AnimationUtils.loadAnimation(this, R.anim.alpha_anim));	    }}

也可使用XMl文件定义：其中有p的表示parent

很简单