Android Question android.app.FragmentManagerImpl.moveToState java.lang.IllegalArgumentException

[Tomas Petrus]

Hey guys I am having reports from google with this error..

Exception java.lang.IllegalArgumentException:
  at android.app.FragmentManagerImpl.moveToState (FragmentManager.java:1297)
  at android.app.FragmentManagerImpl.addAddedFragments (FragmentManager.java:2431)
  at android.app.FragmentManagerImpl.executeOpsTogether (FragmentManager.java:2210)
  at android.app.FragmentManagerImpl.removeRedundantOperationsAndExecute (FragmentManager.java:2166)
  at android.app.FragmentManagerImpl.execPendingActions (FragmentManager.java:2067)
  at android.app.FragmentManagerImpl$1.run (FragmentManager.java:742)
  at android.os.Handler.handleCallback (Handler.java:958)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at android.os.Looper.loopOnce (Looper.java:230)
  at android.os.Looper.loop (Looper.java:319)
  at android.app.ActivityThread.main (ActivityThread.java:8919)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:578)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1103)

I cannot replicate it.
So I asked chat GPT and he adviced to do B4xPages.ShowPage by CallDelayed so I tried to change all this callings to go through

Sub SafeShowPage(PageID As String)
    ' Always delay the page switch to make sure the Activity and fragments are ready
    CallSubDelayed2(Me, "InternalShowPage", PageID)
End Sub

Private Sub InternalShowPage(PageID As String)
    If B4XPages.GetPage(PageID) <> Null Then
        B4XPages.ShowPage(PageID)
    Else
        Log("Page " & PageID & " does not exist.")
    End If
End Sub

But it seems it doesnt help..Same error popup from new version again..
Any advice ?
I have no idea what can cause this.

the app have tousands lines of code..

Thanks

 

[Erel]

No reason to use CallSubDelayed here.

I don't think that the error is related to page switch. Are you using Google Map? Is this all the information you have on this error?

 

[Tomas Petrus]

Yes, google map is in the project, its main part, localize you on map, draw route of your ride, show taxis on map etc..
I thought initialy that it has something to do with it but could find it..
And yes this is full error...nothing more

 

[Erel]

The reason that I asked about GoogleMaps is that it uses a Fragment to manage its state. This feature is rarely used in B4A.

I cannot say why this error happens here. We need more information. Check where you access the map from. Make sure that it only happens after the Ready event.