Android Question Message to the compiler?

Jerryk · Jun 27, 2025

I am creating my own custom view. Since my logic is based on Tags, I need to check for the uniqueness of the tag value.
View has a function AddLabel (pTag as String, ....).
I need to prevent using the same Tag when calling:
xxxxx.AddLabel("tag1",...) repeatedly.
I can detect the duplicate in the GetAllViewsRecursive loop, but how do I pass it to the compiler? Passing it via message seems unsystematic to me. Or another solution?

stevel05 · Jun 28, 2025

To raise the error have a look at https://www.b4x.com/android/forum/threads/b4x-throwables-library.125771/#content.

b4x-de · Jun 28, 2025

Please post some example or code snippet. I don't fully understand, why you try to pass something to the compiler.

DonManfred · Jun 28, 2025

Jerryk said:
I need to prevent using the same Tag when calling:
xxxxx.AddLabel("tag1",...) repeatedly.

Add a private map or list to your Customview.
Check this map or list when using AddLabel. Return an error if the tag is already available in the map/list.

stevel05 · Jun 28, 2025

To raise the error have a look at https://www.b4x.com/android/forum/threads/b4x-throwables-library.125771/#content.

Jerryk · Jun 28, 2025

YES! I used Throwables library:

B4X:

Private Sub CheckDuplication (pTag As String)
    If lTags.IndexOf(pTag) <> -1 Then 'check if tag exist in list
        Dim TH As Throwables
        TH.Initialize
        TH.Throw(Throwables_Static.NewIllegalArgumentException("Duplicate tag: " & pTag))
    End If
End Sub

Android Question Message to the compiler?

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