java.lang.NullPointerException: Attempt to read from field 'int android.support.v7.widget.RecyclerView$ItemAnimator$ItemHolderInfo.left' on a null object reference

google.com | 4 months ago
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    NullPointerException when expanding some/most items using support library v23.2.0

    GitHub | 9 months ago | jhavatar
    java.lang.NullPointerException: Attempt to read from field 'int android.support.v7.widget.RecyclerView$ItemAnimator$ItemHolderInfo.left' on a null object reference
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    RecyclerView crashes when fast scroll with load more android

    Stack Overflow | 7 months ago | awaistoor
    java.lang.NullPointerException: Attempt to read from field 'int android.support.v7.widget.RecyclerView$ItemAnimator$ItemHolderInfo.left' on a null object reference

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Root Cause Analysis

  1. 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()
  2. Android v7
    RecyclerView.onLayout
    1. android.support.v7.widget.SimpleItemAnimator.animateChange(SimpleItemAnimator.java:130)
    2. android.support.v7.widget.RecyclerView.animateChange(RecyclerView.java:3062)
    3. android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2924)
    4. android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071)
    4 frames
  3. Android Platform
    ViewGroup.layout
    1. android.view.View.layout(View.java:15614)
    2. android.view.ViewGroup.layout(ViewGroup.java:4968)
    3. android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
    4. android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
    5. android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
    6. android.view.View.layout(View.java:15614)
    7. android.view.ViewGroup.layout(ViewGroup.java:4968)
    8. android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
    9. android.widget.FrameLayout.onLayout(FrameLayout.java:508)
    10. android.view.View.layout(View.java:15614)
    11. android.view.ViewGroup.layout(ViewGroup.java:4968)
    11 frames
  4. android.support.design
    CoordinatorLayout.onLayout
    1. android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1037)
    2. android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:747)
    3. android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)
    4. android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1133)
    5. android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:760)
    5 frames
  5. Android Platform
    ActivityThread.main
    1. android.view.View.layout(View.java:15614)
    2. android.view.ViewGroup.layout(ViewGroup.java:4968)
    3. android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
    4. android.widget.FrameLayout.onLayout(FrameLayout.java:508)
    5. android.view.View.layout(View.java:15614)
    6. android.view.ViewGroup.layout(ViewGroup.java:4968)
    7. android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
    8. android.widget.FrameLayout.onLayout(FrameLayout.java:508)
    9. android.view.View.layout(View.java:15614)
    10. android.view.ViewGroup.layout(ViewGroup.java:4968)
    11. android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
    12. android.widget.FrameLayout.onLayout(FrameLayout.java:508)
    13. android.view.View.layout(View.java:15614)
    14. android.view.ViewGroup.layout(ViewGroup.java:4968)
    15. android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
    16. android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
    17. android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
    18. android.view.View.layout(View.java:15614)
    19. android.view.ViewGroup.layout(ViewGroup.java:4968)
    20. android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
    21. android.widget.FrameLayout.onLayout(FrameLayout.java:508)
    22. android.view.View.layout(View.java:15614)
    23. android.view.ViewGroup.layout(ViewGroup.java:4968)
    24. android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2102)
    25. android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1859)
    26. android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1077)
    27. android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5884)
    28. android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
    29. android.view.Choreographer.doCallbacks(Choreographer.java:580)
    30. android.view.Choreographer.doFrame(Choreographer.java:550)
    31. android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
    32. android.os.Handler.handleCallback(Handler.java:739)
    33. android.os.Handler.dispatchMessage(Handler.java:95)
    34. android.os.Looper.loop(Looper.java:135)
    35. android.app.ActivityThread.main(ActivityThread.java:5312)
    35 frames
  6. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    2. java.lang.reflect.Method.invoke(Method.java:372)
    2 frames
  7. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
    2 frames