minicolor.java

Java 2实用编程百例,一些比较实用的J2SE小程序,可以通过这些程序熟悉JAVA基础知识

package ch09.section07;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

//颜色选择器主程序
public class MiniColor
    extends MIDlet
    implements CommandListener {
  private Display display;

  private MiniColorChooser chooser;

  //退出按钮
  private Command exitCommand = new Command("退出", Command.EXIT, 1);

  public MiniColor() {
    display = Display.getDisplay(this);
    chooser = new MiniColorChooser();
    //设置事件监听器
    chooser.addCommand(exitCommand);
    chooser.setCommandListener(this);

    chooser.setColor(0xffff00);
  }

  //应用程序入口
  public void startApp() {
    display.setCurrent(chooser);
  }

  //挂起应用程序
  public void pauseApp() {
  }

  //撤销应用程序
  public void destroyApp(boolean unconditional) {
  }

  //响应按钮事件
  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
      destroyApp(true);
      notifyDestroyed();
    }
  }
}