Gauge Non Interactive : Gauge « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. Gauge

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Gauge;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class J2MEGaugeNonInteractive extends MIDlet implements CommandListener {
  private Display display;

  private Form form;

  private Command exit;

  private Command start;

  private Gauge gauge;

  private boolean isSafeToExit;

  public J2MEGaugeNonInteractive() {
    display = Display.getDisplay(this);
    gauge = new Gauge("Progress Tracking", false, 100, 0);
    exit = new Command("Exit", Command.EXIT, 1);
    start = new Command("Start", Command.SCREEN, 1);
    form = new Form("");
    form.append(gauge);
    form.addCommand(start);
    form.addCommand(exit);
    form.setCommandListener(this);
    isSafeToExit = true;
  }

  public void startApp() {
    display.setCurrent(form);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) throws MIDletStateChangeException {

  }

  public void commandAction(Command command, Displayable displayable) {
    if (command == exit) {
      try {
        destroyApp(isSafeToExit);
        notifyDestroyed();
      } catch (MIDletStateChangeException Error) {
        Alert alert = new Alert("Busy", "Please try again.", null, AlertType.WARNING);
        alert.setTimeout(1500);
        display.setCurrent(alert, form);
      }
    } else if (command == start) {
      form.removeCommand(start);
      new Thread(new GaugeUpdater()).start();
    }
  }

  class GaugeUpdater implements Runnable {

    public void run() {
      isSafeToExit = false;
      try {
        while (gauge.getValue() < gauge.getMaxValue()) {
          Thread.sleep(1000);
          gauge.setValue(gauge.getValue() + 1);
        }
        isSafeToExit = true;
        gauge.setLabel("Process Completed.");
      } catch (InterruptedException Error) {
        throw new RuntimeException(Error.getMessage());
      }
    }
  }
}

31.15.Gauge
	31.15.1.	Add Gauge to a form
	31.15.2.	Use active and inactive Gauge
	31.15.3.	new Gauge(null, false, 100, 50)
	31.15.4.	Gauge Tracker
	31.15.5.	Gauge Non Interactive
	31.15.6.	Gauge Interactive