Page(s) contain a ViewGroup with a LayoutTransition (or animateLayoutChanges=“true”), which interferes with the scrolling animation

问题

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)

and

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)

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?

回答1:

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);

As looking at official documentation here

https://developer.android.com/reference/androidx/viewpager2/widget/ViewPager2

It states that

If your pages contain LayoutTransitions, then those LayoutTransitions must have animateParentHierarchy set to false. Note that if you have a ViewGroup with animateLayoutChanges="true" in your layout xml file, a LayoutTransition is added automatically to that ViewGroup. You will need to manually call getLayoutTransition().setAnimateParentHierarchy(false) on that ViewGroup after you inflated the xml layout.

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.

来源：https://stackoverflow.com/questions/60004140/pages-contain-a-viewgroup-with-a-layouttransition-or-animatelayoutchanges-tr