Exemplo de como lançar e detectar NFC PushRegistry

Comments

(no comments yet)

Log in or Join to leave comments.

Dados do artigo

---

Artigo

Tradução:

Originado de NFC PushRegistry launch and detect example

Por valderind4

Última alteração feita por hamishwillee em 19 Dec 2011

MIDlet exemplo de registro e lançamento usando NFC push registry e de captura do evento que o MIDlet lançou da tag. Note que o push registration pode ser feito no arquivo JAD.

package com.nokia.nfc.sample.app;
 
import javax.microedition.contactless.ContactlessException;
import javax.microedition.contactless.DiscoveryManager;
import javax.microedition.contactless.ndef.NDEFMessage;
import javax.microedition.contactless.ndef.NDEFRecordListener;
import javax.microedition.contactless.ndef.NDEFRecordType;
import javax.microedition.io.PushRegistry;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
 
/*
 * Example of launching midlet using push registry
 * and getting event of the tag that launched the midlet.
 */
public class PushAndDetectExample extends MIDlet implements NDEFRecordListener {
 
    private Form form;
    private TextField pushTextField;
    private DiscoveryManager dm;
 
    protected void startApp() throws MIDletStateChangeException {
 
        // Create UI
        form = new Form("Form");
        pushTextField = new TextField("Pushregistration", "", 255,
                TextField.UNEDITABLE);
        form.append(pushTextField);
        Display.getDisplay(this).setCurrent(form);
 
        // Register target to discovery
        dm = DiscoveryManager.getInstance();
        try {
            dm.addNDEFRecordListener(this, new NDEFRecordType(
                    NDEFRecordType.EXTERNAL_RTD,
                    "urn:nfc:ext:yourcompany.com:pushdetectexample"));
        } catch (ContactlessException e) {
            // Catch ContactlessException
        }
 
        try {
            // Make list of connections that are already registered
            String[] regConns = PushRegistry.listConnections(false);
 
            // Boolean to tell if wanted TargetType is already registered
            boolean registered = false;
 
            // Go trough list to see if wanted TargetType is already registered
            for (int i = 0; i < regConns.length; i++) {
                if (regConns[i]
                        .equals("ndef:external_rtd?name=urn:nfc:ext:yourcompany.com:pushdetectexample")) {
                    registered = true;
                }
            }
            // If TargetType is not registered - register it
            if (!registered) {
                // Register this MIDlet to be launched when any tag with right
                // TargetType is touched
                PushRegistry
                        .registerConnection(
                                "ndef:external_rtd?name=urn:nfc:ext:yourcompany.com:pushdetectexample",
                                "com.nokia.nfc.sample.app.PushAndDetectExample", "*");
                pushTextField.setString("Succeeded");
            } else {
                // If target was alredy regisered write that on screen
                pushTextField.setString("Connection already registered");
            }
        } catch (Exception e) {
            // In case of exception write message on screen
            pushTextField.setString("Exception: " + e.getMessage());
        }
    }
 
    protected void pauseApp() {
        // TODO Auto-generated method stub
    }
 
    protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
        // TODO Auto-generated method stub
    }
 
    public void recordDetected(NDEFMessage ndefMessage) {
        // Write notification on the form when NDEF message is detected
        form.append("Record detected\n");
    }
}