creates a Form with two items, an interactive Gauge and a StringItem : Form « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. Form

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Gauge;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;

public class J2MEGaugeTracker extends MIDlet implements ItemStateListener {
  private Gauge mGauge;

  private StringItem mStringItem;

  public J2MEGaugeTracker() {
    int initialValue = 5;
    mGauge = new Gauge("GaugeTitle", true, 10, initialValue);
    mStringItem = new StringItem(null, "[value]");
    itemStateChanged(mGauge);
  }

  public void itemStateChanged(Item item) {
    if (item == mGauge)
      mStringItem.setText("Value = " + mGauge.getValue());
  }

  public void startApp() {
    Form form = new Form("GaugeTracker");
    form.append(mGauge);
    form.append(mStringItem);
    form.setItemStateListener(this);

    Display.getDisplay(this).setCurrent(form);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }
}

31.3.Form
	31.3.1.	Form demo
	31.3.2.	extends Form to create a new form
	31.3.3.	Add controls to form
	31.3.4.	GUI test
	31.3.5.	Add or remove controls from a form
	31.3.6.	creates a Form with two items, an interactive Gauge and a StringItem