Android为缩放动画设置枢轴点 [英] Android setting pivot point for scale animation

问题描述

我试图将视图缩放到一定大小，但还不太了解透视的工作原理.

I am trying to scale views to a certain size but can't quite understand how pivoting works.

说我只想向上缩放视图. "pivotY"应保持什么值?在XML中，它是一个百分比.以编程方式应用枢轴点时如何?

Say I want to scale the view upwards only. What value should the "pivotY" hold? In XML, it is a percentage. How is it when applying pivot point programmatically?

示例:

ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", scaleSize);
ObjectAnimator pivotY = ObjectAnimator.ofFloat(view, "pivotY", pivotPoint);

AnimatorSet set = new AnimatorSet();
set.PlayTogether(scaleY, pivotY);

推荐答案

实际上非常简单.

如果要向上缩放，一个明确的选择是:

If you want to scale upwards one clear option is:

 view.setPivotY(100);

向下:

 view.setPivotY(0);

然后设置动画.

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