Android Question Getting UID from an nfc-v tag (NFC2 lib)

[pixsys]

Hello,
I'm using the nfc2 library to handle nfc-v tags, calling runasync with transceive (and related byte payload).

Is there a way to use the same system to retrieve the Unique Tag Id? As far as i know it should be visible after the _connected event, but i see no way to retrieve it.

I'm using b4a v7.00 beta and NFC2 v2.00

Thanks

 

[Erel]

Should be possible. Can you post the Connected event code?

 

[pixsys]

Sure, the code is very standard, it just starts the read procedure

Private Sub TagTech_Connected (Success As Boolean)

    Dim CurrentTag As TagTechnology= TagTech  'tagtech is global and used in the connect call in activity_resume
    Log($"Connected: ${Success}"$)

    If Success = False Then
        Log(LastException)
    Else
        Read_Chunks(0,7,"ReadDone",False)
    End If
End Sub

What i noticed while debugging is, at that point the TagTechnology object has an array called mID (inside mtag). Is that the UID? And how can i programmatically access it?

EDIT:
found a possible solution on an old post on these boards:

Dim j As JavaObject = TagTech
        Dim tag As JavaObject = j.RunMethod("getTag", Null)
        Dim Id() As Byte = tag.RunMethod("getId", Null)

Testing right now, but seems to work. Still not sure if the same can be achieved throu runasync-> transceive, probably depends on the type of tag

 

[Erel]

The code you found is the correct way to get the id.