Encontrando os dispositivos móveis disponíveis – J2ME
O exemplo abaixo lista os dispositivos que estão remotamente disponíveis para o dispositivo local. Ele lista também os dispositivos que tem o bluetooth desligado.
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.bluetooth.*;
import java.util.Vector;
import java.util.Hashtable;
import java.util.Enumeration;
import java.io.IOException;
public class BluetoothMidlet extends MIDlet implements
CommandListener, Runnable, DiscoveryListener {
private Display display;
private Command discover,exit;
LocalDevice local;
private DiscoveryAgent discoveryAgent;
private Hashtable bluetoothDevices = new Hashtable();
List deviceList;
public BluetoothMidlet() {
display = Display.getDisplay(this);
discover = new Command("Encontrar",Command.SCREEN, 0);
exit = new Command("Sair",Command.EXIT, 0);
// Lista de dispositivosDevice List
deviceList = new List("Selecione o dispositivo", List.IMPLICIT);
deviceList.addCommand(exit);
deviceList.setCommandListener(this);
}
public void startApp() {
Form form = new Form("Devices");
form.addCommand(discover);
form.addCommand(exit);
form.setCommandListener(this);
display.setCurrent(form);
}
public void pauseApp() {}
public void destroyApp(boolean unconditional) {}
private void doBluetoothDiscovery() {
Thread t = new Thread(this);
t.start();
}
// Implementa Runnable
public void run() {
bluetoothDiscovery();
}
public void printString(String s) {
System.out.println(s);
}
private void bluetoothDiscovery() {
LocalDevice localDevice;
try {
localDevice = LocalDevice.getLocalDevice();
} catch (BluetoothStateException e) {
printString("BluetoothStateException: " + e);
return;
}
discoveryAgent = localDevice.getDiscoveryAgent();
RemoteDevice devices[];
try {
devices = discoveryAgent.retrieveDevices(DiscoveryAgent.CACHED);
if (devices != null) {
for (int i=0; i < devices.length; i++) {
bluetoothDevices.put(devices[i].getFriendlyName(false),
devices[i]);
printString("Device (cached): " + d
evices[i].getFriendlyName(false) +
" " + devices[i].getBluetoothAddress() );
}
}
devices = discoveryAgent.retrieveDevices(DiscoveryAgent.PREKNOWN);
if (devices != null) {
for (int i=0; i < devices.length; i++) {
bluetoothDevices.put(devices[i].getFriendlyName(false),
devices[i]);
printString("Device (cached): " +
devices[i].getFriendlyName(false) +
" " + devices[i].getBluetoothAddress() );
}
}
} catch (IOException e) {
printString("Exception (b2): " + e);
}
try {
discoveryAgent.startInquiry(DiscoveryAgent.GIAC, this);
} catch (BluetoothStateException e) {
printString("Exception (b3): " + e);
}
printString("retorna de bluetoothDiscovery()");
}
public void commandAction(Command c, Displayable d) {
if(c == exit) {
notifyDestroyed();
destroyApp(true);
}
if(c == discover) {
doBluetoothDiscovery();
}
}
private void bluetoothCopyDeviceTableToList() {
for (int i=deviceList.size(); i > 0; i--) {
deviceList.delete(i-1);
}
for (Enumeration e = bluetoothDevices.keys(); e.hasMoreElements(); ) {
try {
String name = (String) e.nextElement();
deviceList.append( name, null );
} catch (Exception exception) {
}
}
display.setCurrent(deviceList);
}
// ************************************************
// Implementa BT DiscoveryListener
// ************************************************
public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) {
try {
printString("deviceDisc: " + btDevice.getFriendlyName(false));
// Adiciona o dispositivo
bluetoothDevices.put(btDevice.getFriendlyName(false), btDevice);
} catch (Exception e) {
printString("Exception (b4): " + e);
}
}
public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {
}
public void serviceSearchCompleted(int transID, int respCode) {
}
public void inquiryCompleted(int discType) {
printString("inquiryCompleted! " + discType);
bluetoothCopyDeviceTableToList();
}
// ************************************************
// ************************************************
}
