页面包含具有LayoutTransition（或animateLayoutChanges =“ true”）的ViewGroup，这会干扰滚动动画

问题描述

我将片段与ViewPager2一起使用，我注意到在运行Android 8或9的小米，宇龙，华硕，vivo等设备中发生了两个相关的IllegalStateException异常（我自己无法复制）：

I use fragments with ViewPager2, and I notice two relevant IllegalStateExceptions in production (I can't reproduce it myself) occurring in devices like Xiaomi, Yulong, asus, vivo running Android 8 or 9:

Fatal Exception: java.lang.IllegalStateException: Page can only be offset by a positive amount, not by -758
       at androidx.viewpager2.widget.ScrollEventAdapter.updateScrollEventValues(ScrollEventAdapter.java:280)
       at androidx.viewpager2.widget.ScrollEventAdapter.onScrolled(ScrollEventAdapter.java:178)
       at androidx.recyclerview.widget.RecyclerView.dispatchOnScrolled(RecyclerView.java:5173)
       at androidx.recyclerview.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:5338)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1029)
       at android.view.Choreographer.doCallbacks(Choreographer.java:834)
       at android.view.Choreographer.doFrame(Choreographer.java:760)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1015)
       at android.os.Handler.handleCallback(Handler.java:873)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:224)
       at android.app.ActivityThread.main(ActivityThread.java:7083)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:928)

和

Fatal Exception: java.lang.IllegalStateException: Page(s) contain a ViewGroup with a LayoutTransition (or animateLayoutChanges="true"), which interferes with the scrolling animation. Make sure to call getLayoutTransition().setAnimateParentHierarchy(false) on all ViewGroups with a LayoutTransition before an animation is started.
       at androidx.viewpager2.widget.ScrollEventAdapter.updateScrollEventValues(ScrollEventAdapter.java:272)
       at androidx.viewpager2.widget.ScrollEventAdapter.onScrolled(ScrollEventAdapter.java:178)
       at androidx.recyclerview.widget.RecyclerView.dispatchOnScrolled(RecyclerView.java:5173)
       at androidx.recyclerview.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:5338)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1029)
       at android.view.Choreographer.doCallbacks(Choreographer.java:841)
       at android.view.Choreographer.doFrame(Choreographer.java:769)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1015)
       at android.os.Handler.handleCallback(Handler.java:794)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:176)
       at android.app.ActivityThread.main(ActivityThread.java:6651)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)

环顾四周时，我通过了以下线程：（据我所理解的那样）似乎总结为将viewPager2的任何父布局上的 animateLayoutChanges 设置为false，这就是我所做的。不幸的是，那并不能解决我的问题。然后我找到了另一个线程：，这似乎无济于事。知道还有什么可能导致此问题吗？

While looking around, I passed by the following thread: https://issuetracker.google.com/issues/129530305, which as I understood correctly, seems to summarize to set animateLayoutChanges to false on any parent layout of viewPager2 and that's what I did. Unfortunately, that didn't solve my issue. Then I found another thread: java.lang.IllegalStateException: Page can only be offset by a positive amount, which seems to not help a lot. Any idea what else might cause the issue?

推荐答案

您需要在每个页面/片段上执行此操作

You need to perform this on each of your pages/Fragments

 View view = layoutInflater.inflate(R.layout.page, parent, false);
 ViewGroup viewGroup = view.findViewById(R.id.animated_viewgroup);
 viewGroup.getLayoutTransition().setAnimateParentHierarchy(false);

在这里查看官方文档

它指出

相同的错误日志在第一行中讨论

same your error log talks about on very first line

Fatal Exception: java.lang.IllegalStateException: Page(s) contain a ViewGroup with a LayoutTransition (or animateLayoutChanges="true"), which interferes with the scrolling animation. Make sure to call getLayoutTransition().setAnimateParentHierarchy(false) on all ViewGroups with a LayoutTransition before an animation is started.

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