Crash on Sync Changes to a Shared Folder

[quantology]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

1. Another user on my instance shared a folder with me, with edit and sync permissions
2. I selected "sync" in the nextcloud app on my device, causing the data to be mirrored in my /Android/media/(nextcloud)/(account)/ folder
3. I created a new folder and new files in that folder
4. I navigated to the synced folder in the app

Expected behaviour

I expected to see my new folder & files

Actual behaviour

A fullscrean error modal appeared with the following message:

Cause of error

Exception in thread "main" java.lang.UnsupportedOperationException
    at java.util.AbstractList.add(AbstractList.java:155)
    at java.util.AbstractList.add(AbstractList.java:113)
    at com.owncloud.android.ui.adapter.OCFileListAdapter.bindListItemViewHolder(OCFileListAdapter.java:610)
    at com.owncloud.android.ui.adapter.OCFileListAdapter.bindHolder(OCFileListAdapter.java:502)
    at com.owncloud.android.ui.adapter.OCFileListAdapter.onBindViewHolder(OCFileListAdapter.java:490)
    at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7747)
    at com.owncloud.android.ui.adapter.OCFileListAdapter.onBindViewHolder(OCFileListAdapter.java:1089)
    at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7847)
    at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6646)
    at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6917)
    at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6757)
    at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6753)
    at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2362)
    at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1662)
    at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1622)
    at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:687)
    at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4645)
    at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:4348)
    at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4919)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at androidx.swiperefreshlayout.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:704)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1891)
    at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1880)
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1640)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at com.google.android.material.appbar.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:145)
    at com.google.android.material.appbar.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:43)
    at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:2461)
    at androidx.coordinatorlayout.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:918)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at androidx.drawerlayout.widget.DrawerLayout.onLayout(DrawerLayout.java:1263)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    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:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    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:797)
    at android.view.View.layout(View.java:25822)
    at android.view.ViewGroup.layout(ViewGroup.java:6457)
    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:5164)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:4293)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:3127)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:10807)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1630)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1639)
    at android.view.Choreographer.doCallbacks(Choreographer.java:1235)
    at android.view.Choreographer.doFrame(Choreographer.java:1164)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1613)
    at android.os.Handler.handleCallback(Handler.java:1070)
    at android.os.Handler.dispatchMessage(Handler.java:125)
    at android.os.Looper.dispatchMessage(Looper.java:333)
    at android.os.Looper.loopOnce(Looper.java:263)
    at android.os.Looper.loop(Looper.java:367)
    at android.app.ActivityThread.main(ActivityThread.java:9332)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:566)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:837)

App information

• ID: com.nextcloud.client
• Version: 340000090
• Build flavor: generic

Device information

• [redacted]

Firmware

• SDK: 36
• Release: 16
• Incremental: 2026060601

Android version

16

Device brand and model

Pixel

Stock or custom OS?

Stock

Nextcloud android app version

34.0.0

Nextcloud server version

31.0.10

Using a reverse proxy?

Yes

Android logs

No response

Server error logs

Additional information

No response

[alperozturk96]

fixed via #17152