Java Question how I can caller callsub function from Java library?

[Roberto P.]

Hi All,

I created a library in Java and I need to know how to use the "CallSub" function to call a function that is in the application.

I hope it is clear.

thank in advance
Regards

 

[Erel]

You should never use CallSub from Java. You need to use ba.raiseEventFromUI. For further discussion please start a new thread here:

https://www.b4x.com/android/forum/forums/libraries-developers-questions.32/

 

[Roberto P.]

I don't make a call to the UI, but at procedure that is launched.

I don't found any examples with BA.raiseEventFromUI

 

[Semen Matusovskiy]

To understand internals, you can look java modules inside Objects subfolder.
Unlike B4A doesn't offer official way, to call in both directions is enough simple.

For instance (tested in B4A 8.3 only):

#BridgeLogger : true

Sub Process_Globals

   Private NativeMe As JavaObject

End Sub

Sub Globals

End Sub

Sub Activity_Create(FirstTime As Boolean) 
 
   If FirstTime Then NativeMe.InitializeContext
      Dim stringParameter As String = "Hello World!"
      Dim longParameter   As Long   = -123456789012345678   
      Dim stringReply As String = NativeMe.RunMethod ("FirstMethod", Array (stringParameter, longParameter))   
      Log (stringReply) 'will print "String = Hello World! Long = -123456789012345678"

End Sub

Sub SecondMethod (stringParameter As String, longParameter As Long)   
   
    Log ("String = " & stringParameter & "  Long = " & longParameter) ' will print "String = *** Hello World!  Long = -123456789000000000"
   
End Sub

#If JAVA
public String FirstMethod (String Text, long Value) {   
   try { _secondmethod ("*** " + Text, Value + 12345678); } catch (Exception e) { return ""; };
   return "String = " + Text + " Long = " + Value;
}
#End If

 

[Roberto P.]

I thank you for the suggestion, but this is not the case. because my library was written all in Java. So, I have to find a way to send a message to the application written with B4A

I hope it is clear
thank

 

[DonManfred]

So, I have to find a way to send a message to the application written with B4A

https://www.b4x.com/android/forum/threads/java-creating-libraries-for-basic4android.6810/#content

 

[Dabzy1978]

So, you have an application written in Java, which uses your library, this is on your desktop, and you want to fling a message to an app on a device thats built with B4A?

Could you not use TCP/IP to communicate between them both?

https://www.b4x.com/android/help/network.html

Or do you require, say a C++ application calling an external function in a DLL kinda setup?

Its been a long day at work and I'm confused.com, but thought I'd throw that in there!

Dabz

 

[Semen Matusovskiy]

What about intents ? They specially designed for communication between independent applications.

 

[Erel]

Use ba.raiseEvent or ba.raiseEventFromUI. All other suggestions are wrong.

 

[Roberto P.]

Hi all
summarize, I managed to launch the call with the following steps

1 - declare events
@Events(values={"end_fiscal_printer", "end_not_fiscal_printer"})

2-declare variables
    protected BA         m_ba;
    protected Object     m_Object;

3-assign value at variables
public void Inizialize(BA ba) {
                
            // valorizzo il parametro
            this.m_ba         = ba;
            this.m_Object    = ba;
        }

4-trigger event
 if (m_ba.subExists("end_not_fiscal_printer")) {
    m_ba.raiseEvent(m_Object, "end_not_fiscal_printer");
    }

functions are case sensitive, better to use all lowercase

I thank everyone for help

 

[Erel]

functions are case sensitive, better to use all lowercase

Subs are always lower cased during compilation.