Android Question java.lang.ClassCastException - java.lang.Object cannot be cast to cz.flashcards3000.b4xpagesmanager

[Jerryk]

In my application, I start the receiver right at the beginning of the program, its task is to trigger a reminder at the specified time.

Public Sub Start_receiver
    Wait For (SetNextEvent) Complete (t As Long)
    Wait For (CheckAndRequestNotificationPermission) Complete (HasPermission As Boolean)
    If HasPermission Then
    Else
        Return   
    End If
    Wait For (GetScheduleExactAlarmPermission) Complete (HasPermission As Boolean)
    CancelScheduledService(schedule)
    StartServiceAtExact(schedule, t, True)
End Sub

schedule module

Private Sub Receiver_Receive (FirstTime As Boolean, StartingIntent As Intent)
'    called from StartReceiverAt
    If StartingIntent.Action = "" Then
        
        StartNotification
        
'        schedule next event
        Wait For (SetNextEvent) Complete (t As Long)
        StartReceiverAt(Me, t, True)
    End If
    
'    called from notification button
    If StartingIntent.Action = "inanhour" Then
        Dim p As Period
        p.Hours = 1
        Dim NextTime As Long = DateUtils.AddPeriod(DateTime.Now, p)

        Sleep(1000)
        StartReceiverAt(Me, NextTime, True)
        ntf.Cancel(4)
    End If
End Sub

Private Sub StartNotification
'    create notification
    Dim sched As String = Starter.loc_schedule
    Dim n As NB6
    smiley = LoadBitmapResize(File.DirAssets, "ic_launcher.png", 24dip, 24dip, False)
    n.Initialize("default", Application.LabelName, "DEFAULT").AutoCancel(True).SmallIcon(smiley)
    Dim cs As CSBuilder
    n.AddButtonAction(smiley, cs.Initialize.Color(Colors.Green).Bold.Append(Starter.loc_inanhour).PopAll, Me, "inanhour")
    ntf = n.Build("Flash cards", sched, "tag1", Main)
    ntf.Notify(4)
End Sub

Public Sub SetNextEvent As ResumableSub
    Dim cas As String = Starter.rem_time
    Dim t, tret As Long
    Dim sf As StringFunctions
    sf.Initialize
    Dim l As List = sf.split(cas, ":")
    Dim h As String = l.Get(0)
    Dim m As String = l.Get(1)
    t = DateUtils.SetDateAndTime(DateTime.GetYear(DateTime.Now), _
        DateTime.GetMonth(DateTime.Now), DateTime.GetDayOfMonth(DateTime.Now), h, m, 0)

    If t > DateTime.Now Then
        tret = t
    Else
        tret = DateTime.Add(t, 0, 0, 1) 'next day
    End If
    Return tret
End Sub

Only two devices in Crashlytics: OnePlus 8 Pro and Samsung Galaxy S9 throw an error:

Fatal Exception: java.lang.RuntimeException: Unable to start receiver cz.flashcards3000.schedule: java.lang.RuntimeException: java.lang.ClassCastException: java.lang.Object cannot be cast to cz.flashcards3000.b4xpagesmanager
at android.app.ActivityThread.handleReceiver(ActivityThread.java:4564)
at android.app.ActivityThread.-$$Nest$mhandleReceiver()
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2312)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:240)
at android.os.Looper.loop(Looper.java:351)
at android.app.ActivityThread.main(ActivityThread.java:8423)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)

Caused by java.lang.RuntimeException: java.lang.ClassCastException: java.lang.Object cannot be cast to cz.flashcards3000.b4xpagesmanager
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:258)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:201)
at cz.flashcards3000.schedule.onReceive(schedule.java:42)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:4548)
at android.app.ActivityThread.-$$Nest$mhandleReceiver()
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2312)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:240)
at android.os.Looper.loop(Looper.java:351)
at android.app.ActivityThread.main(ActivityThread.java:8423)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)

Caused by java.lang.ClassCastException: java.lang.Object cannot be cast to cz.flashcards3000.b4xpagesmanager
at cz.flashcards3000.b4xpages._getmanager(b4xpages.java:60)
at cz.flashcards3000.b4xpages._getpage(b4xpages.java:74)
at cz.flashcards3000.schedule$ResumableSub_Receiver_Receive.resume(schedule.java:115)
at cz.flashcards3000.schedule._receiver_receive(schedule.java:72)
at java.lang.reflect.Method.invoke(Method.java)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:221)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:201)
at cz.flashcards3000.schedule.onReceive(schedule.java:42)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:4548)
at android.app.ActivityThread.-$$Nest$mhandleReceiver()
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2312)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:240)
at android.os.Looper.loop(Looper.java:351)
at android.app.ActivityThread.main(ActivityThread.java:8423)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)



How do I fix this? Should I just give up if it only shows up on two devices?

 

[Erel]

This is the relevant error:

at cz.flashcards3000.b4xpages._getpage(b4xpages.java:74)
at cz.flashcards3000.schedule$ResumableSub_Receiver_Receive.resume(schedule.java:115)
at cz.flashcards3000.schedule._receiver_receive(schedule.java:72)

I don't think that it happened with this exact code. Maybe something has changed?

If you think that nothing has changed then compile in release mode and check the code in: schedule.java:115 (Objects\src\...\schedule.java)