Android属性アニメーション設定中心点

Android属性アニメーション設定中心点

public static void rotateIn(RelativeLayout layout, long delay) {
    ObjectAnimator rotate = ObjectAnimator.ofFloat(layout, "rotation", -180f, 0f);
    layout.setPivotX(layout.getWidth()/2);
    layout.setPivotY(layout.getHeight());
    //     invalidate
    layout.invalidate();
    rotate.setDuration(500);
    rotate.setStartDelay(delay);
    rotate.addListener(new MyAnimationListener2());
    rotate.start();
}