showscreen.java

J2ME手机游戏开发技术详解,适合初学者阅读使用

import javax.microedition.midlet.*; 
import javax.microedition.lcdui.*; 
public class ShowScreen extends MIDlet implements CommandListener{ 
        private Display display; 
        private Form props; 
   
  private Command backCommand = new Command("BACK", Command.BACK, 2); 
  private Command cancelCommand = new Command("CANCEL", Command.CANCEL,1); 
  private Command exitCommand = new Command("EXIT", Command.EXIT, 1); 
  private Command helpCommand = new Command("HELP", Command.HELP, 1); 
  private Command itemCommand = new Command("ITEM", Command.ITEM, 1); 
  private Command okCommand = new Command("OK", Command.OK, 1); 
  private Command screenCommand = new Command("SCREEN", Command.SCREEN,1); 
  private Command stopCommand = new Command("STOP", Command.STOP, 1); 
        public ShowScreen(){ 
                display = Display.getDisplay(this); 
         } 
        public void startApp() { 
                props = new Form("Hello World"); 
                props.append("Hello World!\n"); 
                props.addCommand(backCommand); 
                props.addCommand(cancelCommand); 
                props.addCommand(exitCommand); 
                props.addCommand(helpCommand); 
                props.addCommand(itemCommand); 
                props.addCommand(okCommand); 
                props.addCommand(screenCommand); 
                props.addCommand(stopCommand); 
                props.setCommandListener(this); 
                display.setCurrent(props); 
         } 
        public void showScreen(String cmd) { 
                Form form=new Form("show cmd"); 
                form.append(cmd); 
                form.addCommand(exitCommand); 
                form.setCommandListener(this); 
                display.setCurrent(form); 
         
        } 
        public void commandAction(Command c, Displayable s){ 
                if (c == exitCommand)
                { 
                        destroyApp(false); 
                    notifyDestroyed(); 
                }        
                else if(c==helpCommand) 
                { 
                        showScreen("help"); 
                } 
                else if(c==backCommand) 
                { 
                        showScreen("back"); 
                } 
                else if(c==cancelCommand) 
                { 
                        showScreen("cancel"); 
                } 
                else if(c==itemCommand) 
                { 
                        showScreen("item"); 
                } 
                else if(c==okCommand) 
                { 
                        showScreen("ok"); 
                } 
                else if(c==screenCommand) 
                { 
                        showScreen("screen"); 
                } 
                if(c==stopCommand) 
                { 
                        showScreen("stop"); 
                } 
         } 
        public void destroyApp(boolean unconditional)  
        { 
         } 

        public void pauseApp()  
        { 
                display.setCurrent(null); 
                props = null; 
         } 
}