MyAnimation.java

package cn.com.uangel.adsdk.util;
import android.graphics.Matrix;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.Transformation;


public class MyAnimation extends Animation {

    private int halfWidth;
    
    private int halfHeight;
    
    @Override
    public void initialize(int width, int height, int parentWidth,
            int parentHeight) {
        
        super.initialize(width, height, parentWidth, parentHeight);
        setDuration(1500);
        setFillAfter(true);
        
        halfWidth = 0;
        halfHeight = 0;
        setInterpolator(new LinearInterpolator());
        
        
    }
    
    
    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        final Matrix matrix = t.getMatrix();
        matrix.preScale(interpolatedTime, interpolatedTime);       
        //matrix.preRotate(interpolatedTime * 360);        
        //matrix.preTranslate(-halfWidth, -halfHeight);
        matrix.postTranslate(halfWidth, halfHeight);
        
    }
}