MotionLayout中断了（嵌套）子视图的重绘 [英] MotionLayout breaks the redrawing of (nested) subviews

问题描述

我在 MotionLayout 中无法刷新视图时遇到问题。

I'm having problems with views not refreshing in MotionLayout.

似乎在某些时候刷新了 MotionLayout 的/ redraw机制被破坏，子视图（包括嵌套视图）在屏幕上更新自身时出现随机问题。我到目前为止所经历的：

Seems like at some point the refresh/redraw mechanism of MotionLayout becomes broken and the subviews (including the nested ones) are having random problems updating themselves on the screen. What I have experienced so far:

1. RecyclerView 有时没有刷新。当有新数据可用时，就会发生这种情况，我正在使用 Paging 库来填充数据。我通过在到达新数据时滚动1个像素的解决方法进行了修复- recyclerView.smoothScrollBy（0,1）。之后， RecyclerView 开始重绘自身。


2. 打开键盘后，它会随机混乱嵌套的子视图重绘。 github 此处中存在一个问题，一个人在复制所有这些内容通过将 EditText 添加到正式的 MotionLayout 示例中。我看到的一些问题示例：
   
   
   
   
   • 我正在使用 TextInputLayout 和 app：endIconMode = clear_text 在 MotionLayout->中； ConstraintLayout->当我开始键入内容时（也在关闭键盘后），有时有时不会显示TextInputLayout 和 X 按钮。
   
   
   • TextView 被部分重绘！我在 TextView <中显示无结果 或无帖子 文本/ code>，根据某种逻辑在它们之间进行切换，但是在UI中仅显示否 而不刷新整个文本。我已经调试了它，Layout Inspector说一切都很好，文本视图的值为无结果 ，但是在屏幕上看不到它。
   
   
   • 其他一些动画已损坏，例如嵌套的 SwipeRefreshLayout
   
   

1. RecyclerView is not refreshed sometimes. This happens when new data is available, I'm using Paging library to fill the data. I have fixed it with a workaround of scrolling 1 pixel when I got new data there - recyclerView.smoothScrollBy(0,1). After that the RecyclerView starts redrawing itself just fine.
2. When the keyboard is opened it randomly messes the nested subview redrawing. There is an issue in github ⁠here where a guy reproduces all this by adding an EditText to official MotionLayout examples. Some examples of the problems that I'm seeing:
   • I'm using TextInputLayout with app:endIconMode="clear_text" in MotionLayout -> ConstraintLayout -> TextInputLayout and the X button is sometimes not shown when I start typing (also after closing the keyboard).
   • TextView is redrawn partially! I'm showing "No Results" or "No Posts" text in a TextView, switching between them based on some logic, but instead of refreshing the whole text only "No" is shown in the UI. I have debugged it, Layout Inspector says everything is fine, the text view value is "No Results", but I don't see it on the screen.
   • Some other animations are broken, like indeterminate progress animation of nested SwipeRefreshLayout

重要提示：在执行过渡时，所有刷新/重绘问题均已修复！当我进入3个嵌套子视图被冻结/部分绘制的混乱状态时，我只需要按下一个触发我的过渡的按钮，它们全部都快乐地重绘自己！

IMPORTANT: All the refresh/redraw issues are fixed when I do a transition! When I come to some messed state where 3 nested subviews are frozen/partially drawn, then I just need to press a button that triggers my transition, and all of them are happily redrawing themselves!

如果这是已知问题，以及是否有解决方法，请告诉我。我可以做1个像素的不可见过渡，但是我什至无法检测 MotionLayout 刷新何时中断，处理键盘和 RecyclerView 似乎无法涵盖所有​​情况。否则，我将不得不回到 ConstraintLayout 并考虑自己实现惊人的 OnSwipe 功能（即使可能在 ConstraintLayout ）中。

Please let me know if this is a known problem and if there is a workaround for this. I could do invisible 1 pixel transition maybe, but I cannot even detect when the MotionLayout refreshing becomes broken, handling keyboard and new data of RecyclerView doesn't seem to cover all the cases. Otherwise, I will have to move back to ConstraintLayout and think on implementing the amazing OnSwipe functionality myself (if that is even possible in ConstraintLayout).

推荐答案

不是一个真正的答案，但也是渴望发表评论：

Not really an answer, but too long for a comment:

由于您面临的问题可能有多个根本原因，我建议创建一个Sandbox项目并一次安全地重现每个问题和简单的环境。

Since you are facing multiple problem with possibly multiple root causes, I would suggest to create a Sandbox project and reproduce each problem at a time in a safe and simple environment.

对我来说，您似乎对分页库有一个问题（在这种情况下，不是MotionLayout），而对EditText则存在另一个问题。

To me it seem like you have one problem with the paging lib (not with motionLayout in this case) and another problem with the EditText.

您应检查不带ML的分页代码，并检查EditText问题，而不要滚动视图。我知道这没有多大帮助，但也许可以作为解决这些问题的指南。请记住，MotionLayout仍处于beta中，尤其是2.0.0-beta02和beta03版本因回归错误而非常混乱。更新到最新版本（到目前为止为beta04），或继续使用稳定版本。

You should check your paging code without ML and check your EditText problem without any scrolling views. I know this is not much of a help, but maybe a guide how to tackle these problems. Mind that MotionLayout is still in beta and especially release 2.0.0-beta02 and beta03 was pretty messy with regression errors. Update to the newest version (beta04 as of now) or continue using a stable version.

有时，它还有助于搜索 MotionLayout的官方门票

Sometimes it also helps to search the official tickets for MotionLayout

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