RecyclerView ViewPager java.lang.NullPointerException android.support.v7.widget.RecyclerView$ItemAnimator$ItemHolderInfo.left

我正在将ViewPager与Recyclerview一起使用，但在创建时它崩溃了

我正在用Recyclerview.Adapter尝试AsyncListUtil，它成功了。当我将片段移动到ViewPager时，它开始像这样崩溃。有什么见解吗

            FATAL EXCEPTION: main
            Process: com.dekanski.popularmovies, PID: 6554
            java.lang.NullPointerException: Attempt to read from field 'int android.support.v7.widget.RecyclerView$ItemAnimator$ItemHolderInfo.left' on a null object reference
             at android.support.v7.widget.SimpleItemAnimator.animateChange(SimpleItemAnimator.java:130)
             at android.support.v7.widget.RecyclerView.animateChange(RecyclerView.java:3062)
             at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2924)
             at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1627)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1037)
             at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:747)
             at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:761)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
             at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
             at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
             at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
             at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
             at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
             at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
             at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
             at android.view.View.layout(View.java:15671)
             at android.view.ViewGroup.layout(ViewGroup.java:5038)
             at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2086)
             at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1843)
             at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
             at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
             at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
             at android.view.Choreographer.doCallbacks(Choreographer.java:580)
             at android.view.Choreographer.doFrame(Choreographer.java:550)
             at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
             at android.os.Handler.handleCallback(Handler.java:739)
             at android.os.Handler.dispatchMessage(Handler.java:95)
             at android.os.Looper.loop(Looper.java:135)
             at android.app.ActivityThread.main(ActivityThread.java:5254)
             at java.lang.reflect.Method.invoke(Native Method)
             at java.lang.reflect.Method.invoke(Method.java:372)
             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

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我已经弄明白了。。。我没有将

app:layout\u behavior=“@string/appbar\u scrolling\u view\u behavior”

包含到ViewPager中，因此CoordinatorLayout不知道如何正确完成它的工作。

可能是这个问题

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仍然发生在23.1.1上，在使用更具体的

notifyItem{Inserted，Removed，…}

变体替换对

RecyclerView.Adapter.notifyDataSetChanged（）

的所有调用后，崩溃似乎对我来说已经消失了。

它似乎在支持23.2.1版的23.2.0版本中得到了修复。使用23.2.1：

compile 'com.android.support:design:23.2.1'

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它看起来更像是新支持库23.1中引入ItemHolderInfo的bug。在更新到23.1之前，我没有出现此崩溃。是否有指向AOSP错误报告的链接？似乎在23.1.1上已修复，您应该尝试一下。我在23.2.0上遇到了相同的错误（以及其他一些错误，包括延迟和其他小故障）-现在恢复到23.1.1可以解决此问题。这是我的问题。总而言之，当你的物品ID不是唯一的时，就会发生这种情况。3个小时之后：（即使使用23.2.1，猴子也会出现同样的崩溃