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

Stack Overflow | Navas pk | 1 month ago
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  1. 0
    samebug tip
    Call notifyDataSetChanged instead of notifyItemRemoved due to a bug in RecyclerView
  2. 0
    samebug tip
    This probably occurs because you are calling notifyItemInserted(position);, notifyItemChanged(position), or notifyItemRemoved(position); from a background thread (or from a callback, which runs on a background thread). Use a Handler to solve it.
  3. 0
    samebug tip
    Try to reset the previous listener before making any changes to the view.
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  5. 0
    samebug tip
    You cannot update your adapter contents in the background. Prepare your data on the background thread and then pass it to the main thread to update the adapter and call notify.
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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.animateDisappearance()
  2. Android v7
    RecyclerView.onLayout
    1. android.support.v7.widget.SimpleItemAnimator.animateDisappearance(SimpleItemAnimator.java:78)
    2. android.support.v7.widget.RecyclerView.animateDisappearance(RecyclerView.java:3246)
    3. android.support.v7.widget.RecyclerView.access$700(RecyclerView.java:147)
    4. android.support.v7.widget.RecyclerView$4.processDisappeared(RecyclerView.java:422)
    5. android.support.v7.widget.ViewInfoStore.process(ViewInfoStore.java:231)
    6. android.support.v7.widget.RecyclerView.dispatchLayoutStep3(RecyclerView.java:3086)
    7. android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2914)
    8. android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3277)
    8 frames
  3. Android Platform
    ViewGroup.layout
    1. android.view.View.layout(View.java:16655)
    2. android.view.ViewGroup.layout(ViewGroup.java:5477)
    3. android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
    4. android.view.View.layout(View.java:16655)
    5. android.view.ViewGroup.layout(ViewGroup.java:5477)
    6. android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
    7. android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1732)
    8. android.widget.LinearLayout.onLayout(LinearLayout.java:1497)
    9. android.view.View.layout(View.java:16655)
    10. android.view.ViewGroup.layout(ViewGroup.java:5477)
    11. android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
    12. android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
    13. android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
    14. android.view.View.layout(View.java:16655)
    15. android.view.ViewGroup.layout(ViewGroup.java:5477)
    16. android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
    17. android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
    18. android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
    19. android.view.View.layout(View.java:16655)
    20. android.view.ViewGroup.layout(ViewGroup.java:5477)
    20 frames
  4. com.android.launcher3
    SlidingUpPanelLayout.onLayout
    1. com.android.launcher3.SlidingUpPanelLayout.onLayout(SlidingUpPanelLayout.java:588)
    1 frame
  5. Android Platform
    FrameLayout.onLayout
    1. android.view.View.layout(View.java:16655)
    2. android.view.ViewGroup.layout(ViewGroup.java:5477)
    3. android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
    4. android.widget.FrameLayout.onLayout(FrameLayout.java:273)
    4 frames
  6. com.android.launcher3
    DragLayer.onLayout
    1. com.android.launcher3.DragLayer.onLayout(DragLayer.java:525)
    1 frame
  7. Android Platform
    FrameLayout.onLayout
    1. android.view.View.layout(View.java:16655)
    2. android.view.ViewGroup.layout(ViewGroup.java:5477)
    3. android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
    4. android.widget.FrameLayout.onLayout(FrameLayout.java:273)
    5. android.view.View.layout(View.java:16655)
    6. android.view.ViewGroup.layout(ViewGroup.java:5477)
    7. android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
    8. android.widget.FrameLayout.onLayout(FrameLayout.java:273)
    9. android.view.View.layout(View.java:16655)
    10. android.view.ViewGroup.layout(ViewGroup.java:5477)
    11. android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
    12. android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
    13. android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
    14. android.view.View.layout(View.java:16655)
    15. android.view.ViewGroup.layout(ViewGroup.java:5477)
    16. android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
    17. android.widget.FrameLayout.onLayout(FrameLayout.java:273)
    17 frames
  8. Android
    PhoneWindow$DecorView.onLayout
    1. com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2694)
    1 frame
  9. Android Platform
    ActivityThread.main
    1. android.view.View.layout(View.java:16655)
    2. android.view.ViewGroup.layout(ViewGroup.java:5477)
    3. android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171)
    4. android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931)
    5. android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
    6. android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
    7. android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
    8. android.view.Choreographer.doCallbacks(Choreographer.java:670)
    9. android.view.Choreographer.doFrame(Choreographer.java:606)
    10. android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
    11. android.os.Handler.handleCallback(Handler.java:739)
    12. android.os.Handler.dispatchMessage(Handler.java:95)
    13. android.os.Looper.loop(Looper.java:148)
    14. android.app.ActivityThread.main(ActivityThread.java:5438)
    14 frames
  10. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    1 frame
  11. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:762)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
    2 frames