B4J Question How to save and load items on the treetableview?

[prhymery]

hi, I am a newbee in this field.
I am using b4j very usefully to make my application.

I am trying to save items on treetableview which I input after program running

so, I tried to use "Flie.WriteList" and "File.RoadList".

when I use RoadList, however, there was some error occurred like this.

java.lang.ClassCastException: java.lang.String cannot be cast to javafx.scene.control.TreeItem
at b4j.example.main._button48_click(main.java:1628)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:625)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:234)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
at anywheresoftware.b4a.BA$1.run(BA.java:215)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Thread.java:748)


how can I save my treetableview data(items) and load these?

 

[MarkusR]

here is a tutorial
https://www.b4x.com/android/forum/threads/treetableview.81611/#content

it used a Dim tti As TreeTableItem

java.lang.ClassCastException: java.lang.String cannot be cast to javafx.scene.control.TreeItem

the error said the compiler can not make (cast) this needed object from a string.

 

[prhymery]

here is a tutorial
https://www.b4x.com/android/forum/threads/treetableview.81611/#content

it used a Dim tti As TreeTableItem


the error said the compiler can not make (cast) this needed object from a string.

Thanks, markusR.
I wrote the wrong question.
Actually, I want to save treetableitem in local storage.

 

[Erel]

Create a custom type with all the values you want to store.

Add all instances of this type to a list and save the list with B4XSerializator or KVS 2.

 

[prhymery]

Create a custom type with all the values you want to store.

Add all instances of this type to a list and save the list with B4XSerializator or KVS 2.

thanks, Erel.

I'll try it.