Java Question Adding new functionalities and tags decoding to NFC library

[Rafal Galewski]

Good JOB

Thank You for Good Job.

I can Help You in this topic:

"I don't know how to put the "filter_nfc.xml" under "res/xml" directory."

You should go to Yor project folder then Objects\res\xml

And please create nfc_tech_filter.xml

But You have to change files setings to read-only


I would be waiting for posibilites create own key A and B and use it to format Mifare card to all sector.
And also writing data to choose sectores.

 

[Rafal Galewski]

The attachments are the new version of NFC library and a sample application. I added some extra java code to the library by Sherlok and Erel.

Here's how to use the lib:
1.initialize a "MiFare" object.
2.Call ReadSector() method with 3 parameters: SectorIndex, KeyData, KeyType
3.If succeeded, retrieve the data block by block with method GetBlockData()

Sub Read()
   Dim key(16) As Byte 
   Dim block_data() As Byte
   Dim bc As ByteConverter



   
   Dim i As Int
   For i  = 0 To 15
      key(i) = 255 '0xff
   Next

   'btnClear
   Dim mfc As MiFare
   Log("Check if the card is MF classic")
    If NFC.IsMifareClassic(Activity.GetStartingIntent) Then
      Dim StrData As String
      mfc.Initialize(Activity.GetStartingIntent)
      If True = mfc.ReadSector(0,key,0) Then' Read sector 0, key, type 0(as keyA)      
         Log("Read sector done")
         For i = 0 To 2 'read 3 blocks of data
            block_data = mfc.GetBlockData(i)
            StrData =  bc.HexFromBytes(block_data)
            Log( "data:" & StrData)
            If i = 0 Then
               Label1.Text = StrData
            Else If i = 1 Then
               Label2.Text = StrData
            Else If i = 2 Then
               Label3.Text = StrData
            End If
         Next
      End If
   End If
End Sub

In manifest editor, I added "android.nfc.action.NDEF_DISCOVERED" and "android.nfc.action.TAG_DISCOVERED" intent filter. Actually "android.nfc.action.TECH_DISCOVERED" is better than NDEF_DISCOVERED but it needs some code like:

  <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
          android:resource="@xml/filter_nfc" />

I don't know how to put the "filter_nfc.xml" under "res/xml" directory. Maybe Erel knows.

Good luck

When I try open sample project I have error missing 2 files:
-Main.bal
-UriView.bal

If You could please shere it.

Thank You :sign0098:

 

[Rafal Galewski]

If You could in future please add to this library method Save data in sector with key.
Becouse nowe we can only read data from sector.
But we can't save data in sectores.

Thank You

 

[jjcc]

When I try open sample project I have error missing 2 files:
-Main.bal
-UriView.bal

If You could please shere it.

Thank You :sign0098:

Sorry for the error and delay. It was in rush because I was busy on other project.

I've updated the code. Meanwhile, fixed a couple of bugs in Lib.

 

[Rafal Galewski]

NFC and sleep telephone

Standard NFC create intent only when we have telephone active ( no sleep).

But Can I sleep off when I put NFC TAG on my phone ?

I put a NFC TAG and telephone execute sleep off and start unblock procedure.

Pass PIN for example.

This can be realisase ?

maybe someone has an idea how to implement?

 

[Erel]

Please do not post duplicate questions.

 

[Rafal Galewski]

Please do not post duplicate questions.

I search good place to add post.

 

[walterf25]

NFC Help

Hello, i've tried this library and it seems like there's something missing, I copied both files .xml and .jar to my additional libraries folder, but when I open the example and try to run it i get an error, it seems as there's still missing a file.

the problem is at this line

Dim mfc As MiFare

that line remains in color red, which means that there's no library associated with MiFare, what am I missing?

thanks,
Walter

 

[jjcc]

Hello, i've tried this library and it seems like there's something missing, I copied both files .xml and .jar to my additional libraries folder, but when I open the example and try to run it i get an error, it seems as there's still missing a file.

the problem is at this line

Dim mfc As MiFare

that line remains in color red, which means that there's no library associated with MiFare, what am I missing?

thanks,
Walter

I think you have both versions and B4A was confused. B4A might search lib files in its standard location first.

To fix this, you can verify the NFC version in the "Libs" tab at the right side of IDE. If it's 1.00, then move the NFC.xml and NFC.jar in the standard lib location (i.e. "your location\Basic4Android\Libraries\").

Good luck!

 

[StevieDk]

Hello,
NFC lib works wonderfull, thanks all for your work. I will need to write on a MIFARE tag, as far as i know, that feature is not implemented yet.
I will like to help on it, so we can all have the utility. I am farely new on this blog, so i am not use on where / how to access java code of the lib so i can continue ( or try to) your excellent work.
Thanks

Steve

 

[vampirbcn]

Thanks, it works perfect in LG-P760 smartphone

 

[raphael75]

I've updated the code. Meanwhile, fixed a couple of bugs in Lib.
Attached Files:
NFC2.22.zip
File size: 8.9 KB

The ZIP file is called NFC2.22, but the version in the XML file is 1.22.

 

[sdujolo]

The ZIP file is called NFC2.22, but the version in the XML file is 1.22.

Thanks

 

[jjcc]

The ZIP file is called NFC2.22, but the version in the XML file is 1.22.

Yes. It was a typo. 1.22 is the correct version number.

 

[jjcc]

Hello,
NFC lib works wonderfull, thanks all for your work. I will need to write on a MIFARE tag, as far as i know, that feature is not implemented yet.
I will like to help on it, so we can all have the utility. I am farely new on this blog, so i am not use on where / how to access java code of the lib so i can continue ( or try to) your excellent work.
Thanks

Steve

Thanks Steve.

I have no problem to share the source code. If Erel agrees I can put the code into the Github. Most of the code belongs to Erel I think.

 

[Erel]

You can upload it.

 

[StevieDk]

Thanks Both, Erel and jjcc, i will try to do as good job as you did with the lib.

 

[jjcc]

I'll upload the source code later after I clean up some mess.

For now I have a new version with limited NfcV functions. A demo is attached to show how to use the NfcV functions. Only read no write for now.

I've tested a ISO 15693 tag(ICODE SLI/NXP SL2 ICS2001). It works fine.

 

[Chelu]

I have read many post about NFC.
Before wasting more time I would like to know if this library can do the following:
I want my phone it acts backup my RFID card.
I mean, no need to write, but I need a NFC reader detects my phone as my card
If this were possible, I wonder too if a trigger event or intent to make reading on my phone that could capture.

Thank you very much.

 

[jjcc]

Chelu,
The function you want is card simulation as opposed to reader which is a quite new function. I believe Android 4.4 supports the function.

The current lib can not meet your requirement.