Java and NFC

Hi,

i hope i have start this thread in the right section.


I have start with the theme nfc (near field communication) with this code:

Read serial number of NDEF (NFC) tag - Forum Nokia Wiki

that was simple.

But what i have to do, if i have more than one target to analyze?
For example in than way:

Code:

---

public void targetDetected(TargetProperties[] prop) {

      if(prop[0].getUid().equals("9816628c")){

      form.append("Option1");
      form.append("\\NEXT CHOICE");

          if(prop[1].getUid().equals("12e6a1d4")){
          form.append("Option2");

            }
            else{
            form.append("FAILTURE2");
            }
      }
      else{
      form.append("FAILTURE");
      }
  }

---

In this way the second tag, I can't analyze.

Any suggestions please ??

Thx nunu

What is that piece of code supposed to do ?
What more do you want it to do?

Please use code tags to format your code to preserve indentation.

Sorry

My aim is to choice, between different tagets.

How i can format java code?

Quote:

---

f(prop[0].getUid().equals("9816628c")){

---

What's a target? Is some part of the above a "target"?

Put [code ] and [/code ] without spaces around the code.

Thx,

Quote:

---

if(prop[1].getUid().equals("12e6a1d4")){

---

is the second target, which choice with the device.
but the targetlistner works only with prop[0].

I need to analyzed, one target, after one target.

Quote:

---

TargetProperties[] prop

---

The args to the method is an array.
You can use a loop to look at each element in the array, index from 0 to prop.length-1

Replace prop[0] with prop[i] where i is the loop index.

This way I have try.

but every target is set on the first place prop[0].

Quote:

---

every target is set on the first place prop[0].

---

What is a "target"?
What are in the rest of the elements in prop?

Code:

---

public class ReadSerial extends MIDlet implements TargetListener {
 
    private Form form;
    private TextField textField;
 
    protected void startApp() throws MIDletStateChangeException {
        // Get instance of NFC Discovery Manager
        DiscoveryManager dm = DiscoveryManager.getInstance();
 
        // Register NDEF_TAG target to discovery
        try {
            dm.addTargetListener(this, TargetType.NDEF_TAG);
        } catch (IllegalStateException e) {
            // Catch IllegalStateException
        } catch (ContactlessException e) {
            // Catch ContactlessException
        }
 
        // Initialize and show user interface elements
        form = new Form("ReadSerial");
        textField = new TextField("Unique identifier:", "", 255, TextField.UNEDITABLE);
        form.append(textField);
        Display.getDisplay(this).setCurrent(form);
    }
 
    protected void pauseApp() {
    }
 
    protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
    }
 
    public void targetDetected(TargetProperties[] prop) {
        // Set unique identifier of the detected target on the Text Field
        textField.setString(prop[0].getUid());
    }
 
}

---

this is an example form the Nokia-Forum. (link in the first post)

Sorry, your question seems to be about how to get info from some hardware device.
I'm just a java programmer and don't know anything about your hardware.

You'll have to read the doc for the device to see what to ask it to get the desired info.

Thx

it is a standard API,
the connection to the device is build throw the MIDlet and the method targetDetected().

Connecting isn't a problem. only save the tags(targets).