属性动画PropertyAnimation

//缩放属性动画。
public void scale(View view) {
    ObjectAnimator scale_anim = ObjectAnimator.ofFloat(imageview, "scaleX", 0.5f,2);
    scale_anim.setDuration(5000);
    scale_anim.setRepeatCount(0);
    ObjectAnimator scale_anim_y = ObjectAnimator.ofFloat(imageview, "scaleY", 0.5f,2);
    scale_anim_y.setDuration(5000);
    scale_anim_y.setRepeatCount(0);
    scale_anim_y.start();
    scale_anim.start();
}