// EchoClientMIDlet.java// Andrew Davison, ad@fivedots.coe.psu.ac.th, August 2005/* This screen starts the device and services search, and reports    its ongoing status. At the end of the search, a services    list screen (ServicesList) is displayed.   A service is chosen from the list, and a form allows the user to    send messages and receive echoed responses from the server.   The echoed messages are changed to uppercase.*/import javax.microedition.midlet.*;import javax.microedition.lcdui.*;import java.util.*;public class EchoClientMIDlet extends MIDlet                                   implements CommandListener {  // UUID and name of the echo service  private static final String UUID_STRING = "11111111111111111111111111111111";         // 32 hex digit string (will become 128 bit ID)  private static final String SERVICE_NAME = "echoserver";   // use lowercase  // GUI elements  private Form form;  private Gauge searchGauge;  private int gaugeIndex;  private StringItem statusSI;  private Command exitCmd;  private Display display;  private ServiceFinder serviceFinder;  public EchoClientMIDlet()   {    // build GUI    form = new Form("Searching");    exitCmd = new Command("Exit", Command.EXIT, 1);    form.addCommand(exitCmd);     statusSI = new StringItem("Status: ", "Starting...");    searchGauge = new Gauge("Bluetooth Service Search", false,                         Gauge.INDEFINITE, Gauge.CONTINUOUS_RUNNING);    form.append(statusSI);    gaugeIndex = form.append(searchGauge);     form.setCommandListener(this);    // start searching for services    serviceFinder = new ServiceFinder(this, UUID_STRING, SERVICE_NAME);  } // end of EchoClientMIDlet()  protected void startApp()   { display = Display.getDisplay(this);    display.setCurrent(form);  } // end of startApp()  protected void pauseApp() {}  protected void destroyApp(boolean unconditional)   // callable from here, ServicesList, and ClientForm  { notifyDestroyed(); }  public void commandAction(Command c, Displayable d)   { if (c == exitCmd)      destroyApp(true);  }  // end of commandAction()  // ----------------- reporting from ServiceFinder --------------  public void setStatus(String msg)  { statusSI.setText(msg);  }  public void searchError(String msg)  // show error message and remove gauge  { statusSI.setText(msg);    searchGauge.setValue(Gauge.CONTINUOUS_IDLE);    form.delete(gaugeIndex);   } // end of searchError()  public void showServices(Hashtable searchTable)  // show the services list screen, so the user can choose a service  { ServicesList sl = new ServicesList(searchTable, this, display);    display.setCurrent(sl);  }} // end fo EchoClientMIDlet class