Android Question call Sub From in Line java to B4a Class Module

[david7374]

Hi everyone
in activity, it's easy to call sub from in Line java to b4a, for example
[CODE lang="b4x" title="call sub from java to b4a in activity"]Sub Activity_Create(FirstTime As Boolean)

Private jo As JavaObject
jo.InitializeContext
jo.RunMethod("startPreview1",Null)

End Sub

Private Sub send_qv(s As String)
Log(s)
End Sub

#if java

public void startPreview1() {
subQvEvent("send","Mohammad");
}

public void subQvEvent(String EventName,String values) {

processBA.raiseEventFromUI(this, EventName.toLowerCase(BA.cul) + "_qv", values);

}

#End If
[/CODE]


but in b4aClass, I do not understand where the error comes from, here is my code
[CODE lang="b4x" title="call sub from in Line java to b4a in b4aClass Module"]Public Sub Initialize

Private jo As JavaObject
jo.InitializeNewInstance(Application.PackageName&".check.thisQv", Array(Null))
jo.RunMethod("startPreview1",Null)

End Sub

Private Sub send_qv(s As String)
Log(s)
End Sub


#if java

public class thisQv{

import anywheresoftware.b4a.BA;

public BA processBA;
public BA ba;


public void startPreview1() {
subQvEvent("send","Mohammad");
}

public void subQvEvent(String EventName,String values) {

processBA.raiseEventFromUI(this, EventName.toLowerCase(BA.cul) + "_qv", values);

}

}
#End If[/CODE]

and this error :
[CODE lang="b4x" title="error"]Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void anywheresoftware.b4a.BA.raiseEventFromUI(java.lang.Object, java.lang.String, java.lang.Object[])' on a null object reference
[/CODE]


These are other codes that I tried and unfortunately got the same error.
[CODE lang="b4x" title="call sub from java to b4a in b4aClass"]
processBA.raiseEventFromUI(this, EventName.toLowerCase(BA.cul) + "_qv", values);

ba.raiseEvent(this,EventName.toLowerCase(BA.cul) + "_qv", values);

ba.raiseEvent(ba,EventName.toLowerCase(BA.cul) + "_qv", values);

ba.raiseEvent2(null, true, EventName.toLowerCase(BA.cul) + "_qv",false,values);[/CODE]



My main question is that, How call Sub From in Line java to B4a Class Module.
Thanks.

 

[Erel]

1. Don't waste your time with activities. Switch to B4XPages.
2.

'in a B4XPages class:
Me.As(JavaObject).RunMethod("startPreview1", Null)

'in the java code:
getBA().raiseEventFromUI(...)

 

[david7374]

Thanks Erel.
In fact, with your help, I learned how to call a function from Java to B4XPages.
But my main problem still persists. How to do it in standard class?
I use classes to categorize code as well as more scalability and readability.
Sometimes I need to use Java functions in classes. These functions may give us the output function after doing a series of tasks, which I need to use these values of this output function in b4a.
For example, when downloading a file, we have two functions, one is the download progress, the values of which are specified when downloading, and the other is called when the download is complete.
[CODE lang="b4x" title="Progress Download and Complete"]#if java

protected void onProgressUpdate(String... progress) {
// setting progress percentage
}

protected void onProgressComplete() {

}

#End if[/CODE]

If we want to use functions, we have to refer the values of these functions to b4a.
In B4XPages Class and activities it's ok. but standard class?
I have not yet found a solution to this issue in the standard class.

 

[agraham]

How to do it in standard class?

Should be the same the same. B4XPages are standard class modules.

 

[david7374]

B4XPages are standard class modules.

Thanks yeah, it was solved. I did not pay attention to this point at all,
Yes, exactly the problem was solved.
Thankful.

Here is my code:
[CODE lang="b4x" title="call sub from in line java to b4a in b4aClass"]Public Sub Initialize


Me.As(JavaObject).RunMethod("startPreview1", Null)

End Sub

Private Sub send_qv(s As String)
Log(s)
End Sub


#if java


public void startPreview1() {
subQvEvent("send","Mohammad");
}

public void subQvEvent(String EventName,String values) {

getBA().raiseEventFromUI(this, EventName.toLowerCase(BA.cul) + "_qv", values);

}

#End If
[/CODE]