J2ME StringItem和ImageItem组件测试

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.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemCommandListener;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


//StringItem 组件的测试：
//	作用：配合不同的外观在屏幕上显示一串字符
//	构造方法：三个参数--第一个是Label，第二个是内容，第三个是外观(PLAIN,BUTTON,HYPERLINK)
//  提取外观：getAppearanceMode(); 获得外观

//案例：包含Item 和 部分高级 UI
public class StringItemTest extends MIDlet implements CommandListener,ItemCommandListener {

	//初始化变量
	private Display display ; 
	private Form mainForm;
	private final static Command CMD_GO = new Command("Go",Command.ITEM,1);
	private final static Command CMD_PRESS = new Command("Press",Command.ITEM,1);
	private final static Command CMD_EXIT = new Command("Exit",Command.EXIT,1);
	//destroyApp
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	// pauseApp
	protected void pauseApp() {
		// TODO Auto-generated method stub

	}

	//startApp
	protected void startApp() throws MIDletStateChangeException {
		System.out.println("程序启动成功，开始执行.....");
		// TODO Auto-generated method stub
		display = Display.getDisplay(this);
		mainForm = new Form("String Item Demo");
		mainForm.append("This is a simple label");
		
		//文本
		StringItem item = new StringItem("This is StringItem label:","This is StringItem text");
		mainForm.append(item);
		
		//超连接    三个参数：第三个表示外观--超链接
		item = new StringItem("Hyper-Link:","hyperlink",Item.HYPERLINK);
		item.setDefaultCommand(CMD_GO);		//设置StringItem 默认命令为：CMD_GO
		item.setItemCommandListener(this);
		mainForm.append(item);

		//按钮
		item = new StringItem("Button","Button",Item.BUTTON);
		item.setDefaultCommand(CMD_PRESS);
		item.setItemCommandListener(this);
		mainForm.append(item);
		
		System.out.println("容器添加命令..");

		// 为Form 容器添加设置命令
		mainForm.addCommand(CMD_EXIT);
		mainForm.setCommandListener(this);
		display.setCurrent(mainForm);
		imageItem();

	}

	public void commandAction(Command c, Displayable d) {
		// TODO Auto-generated method stub
		try {
			destroyApp(false);

			//MIDlet 和AMS 进行通信，通知应用管理软件自己状态的变换，调用notifyDestroyed();
			// notifyPaused();
			notifyDestroyed();
		} catch (MIDletStateChangeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public void commandAction(Command c, Item i) {
		// TODO Auto-generated method stub
		if(c==CMD_GO){
			String text ="Go to the URL.....";
			Alert a = new Alert("URL",text,null,AlertType.INFO);
			display.setCurrent(a);
		}else if(c==CMD_PRESS){
			String text = "Do an action....";
			Alert a = new Alert("Action",text,null,AlertType.INFO);
			display.setCurrent(a);
		}
		// 打印测试
		System.out.println("选中的命令为："+c.getLabel());
		System.out.println(i.getLabel());
	}

	//ImageItem组件测试
	//构造方法的五个参数：1、Item的Label;  2、图片； 3、等效先  ； 4、取代文字(图片无法显示的时候) ； 5、外观
	public void imageItem(){
		this.pauseApp(); //暂停
		Image image = null;
		try{
			image = Image.createImage("/eclipse.png");
		}catch(Exception ex){

		}
		mainForm = new Form("ImageItem 测试");
		mainForm.append(image);

		//图片 1 
		ImageItem iil = new ImageItem("图片 1",image,Item.LAYOUT_CENTER|Item.LAYOUT_NEWLINE_BEFORE,"图片 1 取代文字",Item.BUTTON);
		mainForm.append(iil);

		//图片 2 
		ImageItem ii2 = new ImageItem("图片 2",image,Item.LAYOUT_CENTER|Item.LAYOUT_NEWLINE_BEFORE,"图片 2 取代文字",Item.HYPERLINK);
		mainForm.append(ii2);

		display.setCurrent(mainForm);
	}

}