Android Question How to create a xcustomlistview by code

[mberthe]

the project below doesn't work

#Region  Project Attributes
    #ApplicationLabel: B4A Example
    #VersionCode: 1
    #VersionName:
    'SupportedOrientations possible values: unspecified, landscape or portrait.
    #SupportedOrientations: unspecified
    #CanInstallToExternalStorage: False
#End Region

#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: True
    #BridgeLogger:true
#End Region

Sub Process_Globals
    
End Sub

Sub Globals
    Private clv2 As CustomListView
    Private xwstep As Int=30dip
    Private label1 As B4XView
End Sub

Sub Activity_Create(FirstTime As Boolean)
    clv2.Initialize("main","clv2")
    Activity.AddView(clv2.AsView,100dip,100dip,100dip,7*xwstep)
    For i=1 To 15
        clv2.Add(CreateListItem($"Item #${i}"$, 100dip, xwstep), $"Item #${i}"$)
    Next
    
End Sub

Sub CreateListItem(Text As String, Width As Int, Height As Int) As Panel
    Dim p As Panel
    p.Initialize("")
    p.SetLayout(0, 0, Width, Height)
    p.LoadLayout("CellItem")
    p.Color=Colors.Transparent
    label1.Text = Text
    Return p
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

The message :

Error occurred on line: 28 (Main)
java.lang.RuntimeException: Object should first be initialized (B4XView).
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:50)
at b4a.example.main._activity_create(main.java:389)
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 b4a.example.main.afterFirstLayout(main.java:104)
at b4a.example.main.access$000(main.java:17)
at b4a.example.main$WaitForLayout.run(main.java:82)
at android.os.Handler.handleCallback(Handler.java:743)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5621)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
** Activity (main) Resume **

Thank's for help

 

[mberthe]

Have you added XUI Views to your project? (Libraries Tab)

YES

 

[DonManfred]

Customviews should be loaded from a layout.
You can create a layout with just the xclv and use this layout whenever you need a clv.