B4J Question Exposing a Java code variable in a class to the main module

jkhazraji · Sep 1, 2023

Hi B4X community,
I have the following as a part of a Java code in a class:

B4X:

#if Java
   {
   //
   //....
        String msg ="blabla";
        ba.raiseEvent(null,"get_msg",msg);
   //.....
   //
   }
 
#end if

Is the ba.raiseEvent written correctly?
How would I expose 'msg' variable to the main module of the b4j app and use it there ?

jkhazraji · Sep 1, 2023

And there was silence,
I was able to do it by reading and digging in the forum using multiple parameters:
Edited:

1- Inside the inline Java code:

B4X:

#If Java
String msg1="I am message no. 1";
String msg2="I am message no. 2";
anywheresoftware.b4a.objects.collections.Map Params = new anywheresoftware.b4a.objects.collections.Map();
Params.Initialize();
Params.Put("msg1",msg1);
Params.Put("msg2",msg2);
ba.raiseEvent(this, "get_msgs", new Object[]{Params});
#end if

2- Construct the Sub inside the class:

B4X:

Private Sub get_msgs(Params as Map)

  CallSubDelayed2(Main,"getData",Params)

End Sub

3- In the Main module:

B4X:

Private Sub getData(Params As Map)
    Log("By CallSubDelayed2:")
    Log($"${Params.Get("msg1")}"$)
    Log($"${Params.Get("msg2")}"$)
End Sub

Hope it is of general benefit.

B4J Question Exposing a Java code variable in a class to the main module

jkhazraji

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jkhazraji

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B4J Question Exposing a Java code variable in a class to the main module

jkhazraji

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jkhazraji

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