Android Question B4XCOMBO on CustomListView - Finding clv item

[Andrew (Digitwell)]

I have a B4xCombobox on a panel in a custom list view which has multiple instances of the panel.

When the user changes a combobox the _SelectedIndexChanged event is called.

Normally I would use:

    Private vw As B4XView = Sender

    Private indx As Int  = clv.GetItemFromView(vw) ' Crash on this line
    Log("Clv Index = "& indx)
End Sub

But this causes a crash. Is there any way to find out which item in a CLV is pressed ?

Thanks

Spoiler: Crash log

Error occurred on line: 875 (LandingPage)
java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View
at anywheresoftware.b4a.objects.B4XViewWrapper.asViewWrapper(B4XViewWrapper.java:69)
at anywheresoftware.b4a.objects.B4XViewWrapper.getParent(B4XViewWrapper.java:166)
at b4a.example3.customlistview._getitemfromview(customlistview.java:408)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.keywords.Common.CallSub4(Common.java:1068)
at anywheresoftware.b4a.keywords.Common.CallSubNew2(Common.java:1023)
at uk.co.digitwell.tickedit.b4xcombobox._raiseevent(b4xcombobox.java:159)
at uk.co.digitwell.tickedit.b4xcombobox._cmbbox_itemclick(b4xcombobox.java:145)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA$1.run(BA.java:335)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:180)
at android.app.ActivityThread.main(ActivityThread.java:6944)

 

[walterf25]

I have a B4xCombobox on a panel in a custom list view which has multiple instances of the panel.

When the user changes a combobox the _SelectedIndexChanged event is called.

Normally I would use:

    Private vw As B4XView = Sender

    Private indx As Int  = clv.GetItemFromView(vw) ' Crash on this line
    Log("Clv Index = "& indx)
End Sub

But this causes a crash. Is there any way to find out which item in a CLV is pressed ?

Thanks

Spoiler: Crash log

Error occurred on line: 875 (LandingPage)
java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View
at anywheresoftware.b4a.objects.B4XViewWrapper.asViewWrapper(B4XViewWrapper.java:69)
at anywheresoftware.b4a.objects.B4XViewWrapper.getParent(B4XViewWrapper.java:166)
at b4a.example3.customlistview._getitemfromview(customlistview.java:408)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.keywords.Common.CallSub4(Common.java:1068)
at anywheresoftware.b4a.keywords.Common.CallSubNew2(Common.java:1023)
at uk.co.digitwell.tickedit.b4xcombobox._raiseevent(b4xcombobox.java:159)
at uk.co.digitwell.tickedit.b4xcombobox._cmbbox_itemclick(b4xcombobox.java:145)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA$1.run(BA.java:335)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:180)
at android.app.ActivityThread.main(ActivityThread.java:6944)

Private vw As View = Sender

Try changing

Private vw As B4XView = Sender

To

Private vw As View = Sender

Regards,
Walter

 

[Andrew (Digitwell)]

Walter,

I'm not sure that will make any difference as GetItemFromView takes a B4XView.
the error becomes :
java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View

 

[walterf25]

Walter,

I'm not sure that will make any difference as GetItemFromView takes a B4XView.
the error becomes :
java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View

How about if you change it to this

Dim index As Int = CLV.GetItemFromView(Sender)

That should also work.
Walter

 

[Andrew (Digitwell)]

Sorry.
same error as above.
java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View

I think I have a workaround.
I made the mBase item of the B4xCombo public.

so the code is now:

    Private b4xcb As B4XComboBox = Sender

    Private vw As B4XView= b4xcb.mBase
    
    Private indx As Int  = clv.GetItemFromView(vw)
    Log("Clv Index = "& indx)

This now works but is not ideal as I don't like to alter provided controls.

 

[walterf25]

Sorry.
same error as above.
java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View

I think I have a workaround.
I made the mBase item of the B4xCombo public.

so the code is now:

    Private b4xcb As B4XComboBox = Sender

    Private vw As B4XView= b4xcb.mBase
   
    Private indx As Int  = clv.GetItemFromView(vw)
    Log("Clv Index = "& indx)

This now works but is not ideal as I don't like to alter provided controls.

Interesting, how about if you change the code to this

Dim vw as Spinner = Sender
Dim index As Int = CLV1.GetItemFromView(vw)

Essentially if you are using B4A the control is a spinner, so this should work.

Walter

 

[Andrew (Digitwell)]

Sorry walter, same error as before.

java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View

I think the problem is that the Sender is the B4xCombo class which is not inherited from View.

 

[walterf25]

Sorry walter, same error as before.

java.lang.ClassCastException: uk.co.digitwell.tickedit.b4xcombobox cannot be cast to android.view.View

I think the problem is that the Sender is the B4xCombo class which is not inherited from View.

You can try adding the following sub to the B4XComboBox class

Public Sub AsView As B4XView
    #if B4J
    return cmbBox
    #Else If B4i
    return mBtn
    #Else
    return cmbBox
    #End If
End Sub

And then to find out the view's index

Dim vw as B4XView = Sender
Dim index As Int = CLV1.GetItemFromView(vw.AsView)

Walter

 

[Andrew (Digitwell)]

Good idea.
I will also add that as a wish

 

[Erel]

Are you using the latest version of B4XComboBox? It is included in XUI Views. mBase is a public field which you can use to access the base view.

 

[Andrew (Digitwell)]

No I wasn't I wasn't I was using the stand alone class.

I have replaced and all works fine.

 

[roberto64]

share the whole example
regards