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MainActivity如下:

package cc.cn;import android.animation.ValueAnimator;import android.animation.ValueAnimator.AnimatorUpdateListener;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup.MarginLayoutParams;import android.widget.Button;/** * Demo描述: * 属性动画中ValueAnimator使用实例 * 利用ValueAnimator使控件发生位移(变化Margin值) *  * ValueAnimator是Property Animation很重要的一个类 * ValueAnimator可跟踪记录对象属性已经变化的时间及当前这个时间点的值 *  * 参考资料: * 1 http://blog.csdn.net/linmiansheng/article/details/18716841 * 2 http://blog.csdn.net/linmiansheng/article/details/18763987 * 3 关于属性动画的中文文档,请参见: *   http://blog.csdn.net/think_soft/article/details/7703684 *   http://wiki.eoeandroid.com/Property_Animation *   Thank you very much * */public class MainActivity extends Activity {	private Button mValueAnimatorButton;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        init();    }        private void init(){    	mValueAnimatorButton=(Button) findViewById(R.id.valueAnimatorButton);    	//ValueAnimator.ofInt(int,int)设定了值的变化范围    	final ValueAnimator valueAnimator=ValueAnimator.ofInt(20,100);    	//利用AnimatorUpdateListener监听动画的执行    	valueAnimator.addUpdateListener(new AnimatorUpdateListener() {				@Override			public void onAnimationUpdate(ValueAnimator va) {				//得到动画当前执行的值				//这些值均在(20,100)之间				Integer animatedValue = (Integer)va.getAnimatedValue();				System.out.println("animatedValue="+animatedValue);				MarginLayoutParams marginLayoutParams = (MarginLayoutParams) mValueAnimatorButton.getLayoutParams(); 				marginLayoutParams.leftMargin = animatedValue;				//不断修改Button的Margin值				mValueAnimatorButton.setLayoutParams(marginLayoutParams);			}		});			    	valueAnimator.setDuration(2000);    	//valueAnimator.setRepeatCount(1);    	//valueAnimator.setRepeatMode(ValueAnimator.REVERSE);    	valueAnimator.setTarget(mValueAnimatorButton);    	    	mValueAnimatorButton.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				valueAnimator.start();			}		});    }}

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