B4J Question Beep in CustomView

Guenter Becker · Tuesday at 4:55 PM

Erel said:

Change your code to:

B4X:

Sub Beep
    Dim jo As JavaObject = Me
    jo.RunMethod("beep", Null)
End Sub

#if Java
public static void beep() {
    java.awt.Toolkit.getDefaultToolkit().beep();
}
#End If

Hello,
I used exactly the published code inside a CustomView (XUI) class. The code works but there is not sound. Why?

LucaMs · 2025-10-01T06:14:59+0100

Guenter Becker said:
inside a CustomView (XUI) class

Are you modifying the CustomListView source code? (Nothing negative, it's allowed; I'm just asking to make sure I understand correctly.)

Anyway, I think one of the first things to do when debugging is to write lots of logs; in this case, to verify that Sub Beep is actually being called by the rest of your project.

I'm also wondering if inline-java is necessary; is it possible there's no library for "playing" a beep (I don't remember, I'll have to look)?
Or maybe you don't want to use one?

LucaMs · 2025-10-01T06:18:58+0100

Also, try this one:
https://www.b4x.com/android/forum/threads/generate-beep-on-a-desktop.135209/post-855115

Guenter Becker · 2025-10-01T08:48:06+0100

LucaMs said:
Are you modifying the CustomListView source code? (Nothing negative, it's allowed; I'm just asking to make sure I understand correctly.)

Anyway, I think one of the first things to do when debugging is to write lots of logs; in this case, to verify that Sub Beep is actually being called by the rest of your project.

I'm also wondering if inline-java is necessary; is it possible there's no library for "playing" a beep (I don't remember, I'll have to look)?
Or maybe you don't want to use one?

Thank you for your response,
I'm developing a CustomView and one of its feature is to play a beep called by other Sub.
Due to developing in B4J there is no lib available to do so except you use a mediaplayer/streaming. Therefor in the B4J Forum erel published the shown code. I tested also the solutions of alternatives without Java code but they throw an error that they can't load the named AWT Toolkit.
Erels Code is firing no error but not sound. Checked PC sound is OK.

aeric · 2025-10-01T08:57:26+0100

Checked Windows Sound settings?

LucaMs · 2025-10-01T09:20:13+0100

Guenter Becker said:
Erels Code is firing no error but not sound.

A:

B4X:

Sub Beep
"Log("Sub Beep")

would help you, maybe.

@Star-Dust's code might be helpful, since it doesn't use inline Java; I'd try it:
https://www.b4x.com/android/forum/threads/generate-beep-on-a-desktop.135209/post-855115

aeric · 2025-10-01T09:35:53+0100

Guenter Becker said:
throw an error that they can't load the named AWT Toolkit.

Are you seeing this error:

B4X:

java.lang.IllegalAccessException: class anywheresoftware.b4j.object.JavaObject cannot access class sun.awt.windows.WToolkit (in module java.desktop) because module java.desktop does not export sun.awt.windows to unnamed module @7907ec20

Using StarDust's code, I get this error when using JDK 19 but works for JDK 11 and JDK 14.

If I use Erel's inline Java code, it works for all 3 JDKs.

LucaMs · 2025-10-01T09:41:51+0100

Sometimes it's frustrating to spend so much time on something trivial

Programmers should earn at least as much as politicians!
(Instead, "thanks" to the AIs, in a few years they won't even have a job, not junior programmers.)

Guenter Becker · 2025-10-01T10:06:17+0100

Youre right, I found other solution by using jAudioClip that works

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