itemdemo.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 ItemDemo extends MIDlet implements CommandListener,ItemCommandListener{
    private Form mainForm;
    private Command OK_CMD;
    private Command EXIT_CMD;
    private Command LINK_CMD;
    private Command BUTTON_CMD;
    private Display display;
    private StringItem link_stringItem;
    private StringItem button_stringItem;
    private Alert hlAlert;
    private Alert bAlert;
    public ItemDemo(){
        OK_CMD=new Command("OK",Command.OK,1);
        EXIT_CMD=new Command("EXIT",Command.EXIT,1);
        LINK_CMD=new Command("LINK",Command.ITEM,2);
        BUTTON_CMD=new Command("BUTTON",Command.ITEM,2);
        mainForm=new Form("Item演示");
        //if click hyperlink "here",display anAlert
        link_stringItem=new StringItem(null,"链接",Item.HYPERLINK);
        link_stringItem.setItemCommandListener(this);
        link_stringItem.setDefaultCommand(LINK_CMD);
        button_stringItem=new StringItem(null,"请点击按键",Item.BUTTON);
        button_stringItem.setItemCommandListener(this);
        button_stringItem.setDefaultCommand(BUTTON_CMD);
        hlAlert=new Alert("Item.HYPERLINK","请联系。。。"
                ,null,AlertType.INFO);
        bAlert=new Alert("Item.Button","您按下了按钮!"
                ,null,AlertType.INFO);
        mainForm.append("有任何问题 ,请点击");
        mainForm.append(link_stringItem);
        mainForm.append(button_stringItem);
        mainForm.addCommand(OK_CMD);
        mainForm.addCommand(EXIT_CMD);
        mainForm.setCommandListener(this);
    }
    public void startApp() {
        display=Display.getDisplay(this);
        display.setCurrent(mainForm);
    }
    public void pauseApp() {
    }
    public void destroyApp(boolean unconditional) {
    }
    public void commandAction(Command c ,Displayable d){
        if(c==EXIT_CMD){
            destroyApp(false);
            notifyDestroyed();
        }

    }
    public void commandAction(Command c,Item i){
        if(c==LINK_CMD){
            display.setCurrent(hlAlert,mainForm);
        }
        else if(c==BUTTON_CMD){
            display.setCurrent(bAlert,mainForm);
        }
    }
}