Displayable_Demo.rar_DEMO

/* * DisplayableDemo.java * * Created on 2010年11月1日, 上午10:14 */ import javax.microedition.midlet.*; import javax.microedition.lcdui.*; /** * 演示Displayable类的使用方法 * @author WN * @version */ public class DisplayableDemo extends MIDlet implements CommandListener { //Display管理 Display display = null; //Form对象 Form form = new Form("演示Displayable的使用"); //创建命令按钮 static final Command cmdGetTitle = new Command("获得标题", Command.ITEM,1); static final Command cmdSetTitle = new Command("设置标题", Command.ITEM,1); static final Command cmdGetWidth = new Command("显示宽度", Command.ITEM,1); static final Command cmdGetHeight = new Command("显示高度", Command.ITEM,1); static final Command cmdExit = new Command("退出", Command.STOP, 2); int count = 0; public void startApp() throws MIDletStateChangeException { //设置Displayable对象 form.addCommand(cmdExit); form.addCommand(cmdGetTitle); form.addCommand(cmdSetTitle); form.addCommand(cmdGetWidth); form.addCommand(cmdGetHeight); form.setCommandListener(this); display = Display.getDisplay(this); //获得当前MIDlet的Display对象 display.setCurrent(form); //设置form对象为当前显示对象 } public void pauseApp() { } public void destroyApp(boolean unconditional) { notifyDestroyed(); } /** * 处理命令按钮事件 */ public void commandAction(Command c, Displayable d) { String label = c.getLabel(); if (label.equals("退出")) { destroyApp(true); } else if(label.equals("获得标题")) { form.append("获得标题：" + form.getTitle()+"\n"); } else if(label.equals("设置标题")) { count++; form.setTitle("这是 第" + count + "次设置标题\n"); } else if(label.equals("显示宽度")) { form.append("宽度：" + form.getWidth() + "\n"); } else if(label.equals("显示高度")) { form.append("高度：" + form.getHeight() + "\n"); } } }