Java and NFC

[nunu]

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:

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

[Norm]

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.

[nunu]

Sorry

My aim is to choice, between different tagets.

How i can format java code?

[Norm]

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.

[nunu]

Thx,

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.

[Norm]

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.

[nunu]

This way I have try.

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

[Norm]

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

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

[nunu]

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)

[Norm]

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.

[nunu]

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).