Solve This J2ME Bluetooth Exception

Question

I am new to J2ME. I am learning J2ME Bluetooth application development. I have written some simple code to get the name of my local Bluetooth device. It is working fine in the emulator. But when I try it in my phone then it throws following error.

1. If Bluetooth in my phone is off, then it throws: javax.bluetooth.BlueToothStateException.
2. If Bluetooth in my phone is on, then it throws: javax.bluetooth.bluetoothstateexception: initialize - GetProperty failed

Please help me to get rid of this error, so that I can move forward with my learning process.

Here is my code:

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.bluetooth.*;

public class BluetoothApp3Midlet extends MIDlet implements CommandListener
{
private Display display;
private Form form;
private Command exit;
private LocalDevice local = null;

public void BluetoothApp3Midlet()
{

}

public void startApp() 
{
    form = new Form("Bluetooth Details");
    exit = new Command("Exit",Command.EXIT,1);
    form.addCommand(exit);
    form.setCommandListener(this);
    display = Display.getDisplay(this);
    form.append("Hello");
    form.append("World");
    if(hasBluetoothAPI())
    {
        try
        {
            local = LocalDevice.getLocalDevice();
            String address = local.getBluetoothAddress();
            String name = local.getFriendlyName();
            form.append("Address: "+address+"\n");
            form.append("Name: "+name+"\n");
        }
        catch(Exception e)
        {
            form.append("Error: "+e+"\n");
        }
    }
    else
    {
        form.append("BluetoothAPI not found\n");
    }

    display.setCurrent(form);
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

public void commandAction(Command cmd, Displayable d)
{
    if( cmd == exit )
    {
        this.destroyApp(true);
        this.notifyDestroyed();
    }
}

public static boolean hasBluetoothAPI ()
{
    try
    {
        Class.forName ("javax.bluetooth.LocalDevice");
        return true;
    }
    catch (Exception ex)
    {
        return false;
    }
}
}

Answer 1

you code is incomplete. you need to implement the other methods as described in this tutorial.

This tutorial describes Bluetooth Connection very well.

You can Also look at this PDF file.

Answer 2

You have to add DiscoveryAgent in your code like:

DiscoveryAgent agent;
agent=local.getdiscoveryagent(discoveryagent.giac,this);
agent.startinquiry(discoveryagent.giac,this);