Implicit Menu : List « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. List

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.List;
import javax.microedition.midlet.MIDlet;

public class J2MEListImplicit extends MIDlet implements CommandListener {
  private Display display;

  private List list;

  private Command exit;

  Alert alert;

  public J2MEListImplicit() {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    list = new List("Menu:", List.IMPLICIT);
    list.append("New", null);
    list.append("Open", null);
    list.addCommand(exit);
    list.setCommandListener(this);
  }

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

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command command, Displayable displayable) {
    if (command == List.SELECT_COMMAND) {
      String selection = list.getString(list.getSelectedIndex());
      alert = new Alert("Option Selected", selection, null, null);
      alert.setTimeout(Alert.FOREVER);
      alert.setType(AlertType.INFO);
      display.setCurrent(alert);
    } else if (command == exit) {
      destroyApp(false);
      notifyDestroyed();
    }
  }
}

31.11.List
	31.11.1.	Use List
	31.11.2.	Use List option to hold choice
	31.11.3.	List with strings and images
	31.11.4.	Implicit Menu
	31.11.5.	List check box
	31.11.6.	List radio button