Android Animation Property

详细内容可以参考官方文档

组合动画示例：

ObjectAnimator anim = ObjectAnimator.ofFloat(v, "hello", 1.0f, 0.0f).setDuration(1000);
anim.start();
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
        float cVal=(Float)animation.getAnimatedValue();
        v.setAlpha(cVal);
        v.setScaleX(cVal);
        v.setScaleY(cVal);
        v.setRotationX(cVal*360);
    }
});