Intermittent: Null Pointer Exception when setting adapter second time with updated list

[mdrafiwynk]

Fatal Exception: java.lang.NullPointerException
Attempt to invoke virtual method 'void android.view.View.clearAccessibilityFocus()' on a null object reference

Stack Trace :

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.clearAccessibilityFocus()' on a null object reference
at android.view.ViewGroup.removeViewInternal(ViewGroup.java:5594)
at android.view.ViewGroup.removeViewAt(ViewGroup.java:5550)
at com.rubensousa.dpadrecyclerview.DpadRecyclerView.removeViewAt(DpadRecyclerView.kt:367)
at androidx.recyclerview.widget.RecyclerView$5.removeViewAt(RecyclerView.java:915)
at androidx.recyclerview.widget.ChildHelper.removeViewAt(ChildHelper.java:168)
at androidx.recyclerview.widget.RecyclerView$LayoutManager.removeViewAt(RecyclerView.java:8940)
at androidx.recyclerview.widget.RecyclerView$LayoutManager.removeAndRecycleViewAt(RecyclerView.java:9211)
at androidx.recyclerview.widget.RecyclerView$LayoutManager.removeAndRecycleAllViews(RecyclerView.java:10624)
at androidx.recyclerview.widget.RecyclerView.removeAndRecycleViews(RecyclerView.java:1212)
at androidx.recyclerview.widget.RecyclerView.setAdapterInternal(RecyclerView.java:1236)
at androidx.recyclerview.widget.RecyclerView.setAdapter(RecyclerView.java:1194)
at tv.airtel.xstream.adapters.ContentListAdapter$ContentListViewHolder.bindItem(ContentListAdapter.kt:618)
at tv.airtel.xstream.adapters.ContentListAdapter.onBindViewHolder(ContentListAdapter.kt:197)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7254)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7337)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6194)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6460)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6300)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6296)
at com.rubensousa.dpadrecyclerview.layoutmanager.layout.linear.LinearLayoutEngineer.initLayout(LinearLayoutEngineer.kt:63)
at com.rubensousa.dpadrecyclerview.layoutmanager.layout.StructureEngineer.layoutChildren(StructureEngineer.kt:205)
at com.rubensousa.dpadrecyclerview.layoutmanager.layout.PivotLayout.layoutChildren(PivotLayout.kt:124)
at com.rubensousa.dpadrecyclerview.layoutmanager.layout.PivotLayout.onLayoutChildren(PivotLayout.kt:89)
at com.rubensousa.dpadrecyclerview.layoutmanager.PivotLayoutManager.onLayoutChildren(PivotLayoutManager.kt:129)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4309)
at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:4012)
at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4578)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1915)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1915)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1915)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1915)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1915)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1891)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1729)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1638)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:789)
at android.view.View.layout(View.java:24421)
at android.view.ViewGroup.layout(ViewGroup.java:6443)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:4258)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3583)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2465)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:9305)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1339)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1348)
at android.view.Choreographer.doCallbacks(Choreographer.java:952)
at android.view.Choreographer.doFrame(Choreographer.java:882)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1322)
at android.os.Handler.handleCallback(Handler.java:958)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:205)
at android.os.Looper.loop(Looper.java:294)
at android.app.ActivityThread.main(ActivityThread.java:8177)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

[rubensousa]

@mdrafiwynk

Can you explain what you mean with setting adapter second time? Please show me a small code example that triggers this crash

[mdrafiwynk]

For example : First time I set adaptor with 10 itmes and then i removed one time from any position and then set adaptor again with 9 items.

[rubensousa]

@mdrafiwynk

But can you show me how you trigger those updates exactly? It's important for me to check how you're triggering the updates so I can reproduce the issue myself

[rubensousa]

So you're using setAdapter multiple times, is that it?

[mdrafiwynk]

Yes. I am using nested recyler view and inside each parent recycler view nested recyler view adapter is called every time when anything added or removed in rail. Ex - Continue watching rail

[rubensousa]

Can you please share a small demo project with those setAdapter calls then?

[rubensousa]

@mdrafiwynk any update here?

[mdrafiwynk]

Sorry. But i didn't have time to create demo. Also I am not sure this is the Rott cause for this or not. But this is very frequently observed when use nested recyler view