Android Question Need help using an external Jar

[abruce]

Hi,
I am trying to use an external jar for a built in rfid scanner.

The supplier of the rfid reader is Idtronic (http://www.en.idtronic-rfid.com/) and the unit I am developing for is called C4RED (http://www.en.idtronic-rfid.com/handheld-computers/c4-red)

The rfid reader is a reader for 125 kHz tags, and Idtronic has supplied the jars that are needed and I also found a Android studio example (Lf125KManager) in the SDK download.

I have tried to follow the example for the Picasso external jar in another thread, but since I am no java expert, I have got into trouble when I try to use the callback function in the jar (at least I think it's a callback function, but it is called "Handler" in the documentation and in the Android Studio example.

I have the following B4A code:

Sub Activity_Create(FirstTime As Boolean)
'Do not forget to load the layout file created with the visual designer. For example:
Activity.LoadLayout("Main")
Dim jo As JavaObject = GetLf125Manager
Dim handler1 As Object = jo.CreateEvent("com.handheld.LF125K.handler", "SetHandler", Null)
GetLf125Manager.RunMethod("Open", handler1)
End Sub



Sub GetLf125Manager As JavaObject
Dim jo As JavaObject
Return jo.InitializeStatic("com.handheld.LF125K.Lf125KManager")
End Sub

Sub GetContext As JavaObject
Return GetBA.GetField("context")
End Sub

Sub GetBA As JavaObject
Dim jo As JavaObject
Dim cls As String = Me
cls = cls.SubString("class ".Length)
jo.InitializeStatic(cls)
Return jo.GetFieldJO("processBA")
End Sub

It is the line in bold I get a runtime error on

** Activity (main) Resume **
** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
Error occurred on line: 52 (Main)
java.lang.ClassNotFoundException: com$handheld$LF125K$handler


(Could not upload the C4RED SDK (file too large) but it can be found here:

http://download.idtronic.de/Handheld/C4 RED SDK.zip

)

Any help is appreciated.

Best regards
Anders Bruce

 

[Erel]

Please use [code]code here...[/code] tags when posting code.

There are several mistakes in your code.
1. You should use InitializeNewInstance when you initialize the manager.
2. The handler cannot be created with CreateEvent.

It will be easier to create a small wrapper for this SDK.