小编Nee*_*eko的帖子

我们的应用程序上有一个包含三个片段的ViewPagerFragmentPagerAdapter.其中两个片段由每个片段的Recyclerview组成.

第一页(没有ViewPager的片段)正确显示.但是,当ViewPager尝试预加载下一页(RecyclerView)时,应用程序因NullPointerException以下日志崩溃而崩溃:

 java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.support.v7.widget.RecyclerView$ViewHolder.shouldIgnore()' on a null object reference
         at android.support.v7.widget.RecyclerView.findMinMaxChildLayoutPositions(RecyclerView.java:2839)
         at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2626)
         at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3011)
         at android.view.View.layout(View.java:15684)
         at android.view.ViewGroup.layout(ViewGroup.java:4981)
         at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1626)
         at android.view.View.layout(View.java:15684)
         at android.view.ViewGroup.layout(ViewGroup.java:4981)
         at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
         at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
         at android.view.View.layout(View.java:15684)
         at android.view.ViewGroup.layout(ViewGroup.java:4981)
         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:15684)
         at android.view.ViewGroup.layout(ViewGroup.java:4981)
         at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1000)
         at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:710)
         at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:724)
         at android.view.View.layout(View.java:15684)
         at android.view.ViewGroup.layout(ViewGroup.java:4981)
         at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:907)
         at android.view.View.layout(View.java:15684)
         at android.view.ViewGroup.layout(ViewGroup.java:4981)
         at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
         at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
         at android.view.View.layout(View.java:15684)
         at android.view.ViewGroup.layout(ViewGroup.java:4981) …