视图在RotationY动画快要结束时消失 [英] View disappears near end of RotationY animation

问题描述

我正在尝试制作一个光滑的动画，其中占据屏幕大部分空间的视图旋转以显示背面的另一个视图:

I'm attempting to put together a slick animation in which a view that takes up most of the screen space rotates to reveal another view on the rear side:

rotatingView.animate().rotationY(90)
            .setDuration(250)
            .setInterpolator(new AccelerateInterpolator())
            .withEndAction( /* Runnable that sets up the rear side of the view,
                               then rotates Y another 90 degrees */);

问题在于，在此动画中，大约80％的视图消失了.直到下半年的大约20％时，该视图才重新出现.换句话说，它在11点消失，并在1点重新出现.为什么会这样?

Problem is, about 80% of the way through this animation, the view disappears. The view doesn't reappear until about 20% of the way into the second half. Put another way, it disappears at 11 o'clock and reappears at 1 o'clock. Why is this?

推荐答案

我终于偶然发现了此类问题的答案.使用setCameraDistance()，但请注意:

I finally stumbled on the answer to this type of problem. UsesetCameraDistance(), but note that:

距离以深度像素"表示.默认距离取决于屏幕密度.例如，在中等密度显示器上，默认距离是1280.在高密度显示器上，默认距离是1920.

The distance is expressed in "depth pixels." The default distance depends on the screen density. For instance, on a medium density display, the default distance is 1280. On a high density display, the default distance is 1920.

因此，要将摄像机提升"到视图的近边缘不会对其进行裁剪的点，请将距离设置为默认"距离的几倍.以我的几个平板电脑屏幕为例，需要4000f的值.有关setCameraDistance()的更多信息，请参见链接.参数计算.

So, to "raise" the camera to the point where the near edge of a view doesn't clip it, set the distance to several times the "default" distance. In my case with several tablet screens, a value of 4000f was needed. See the link for more onsetCameraDistance()parameter calculation.

您可能希望将XML文件中的setCameraDistance()与clipToPadding="false"和clipChildren="false"组合在一起；这些控制一个视图对另一个视图的遮罩.

You may want to combinesetCameraDistance()with clipToPadding="false" and clipChildren="false" in your XML file; these control masking of one view by another.

此外，我怀疑YMMV跨不同的Android版本和供应商.

Also, I suspect YMMV across different Android releases and vendors.

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