appearancemode.java

在eclipse的环境下

import java.io.IOException;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
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;

public class AppearanceMode extends MIDlet implements ItemCommandListener{
	Display display = null;
	Form form = new Form("显示模式演示");
	ImageItem ii = null;
	StringItem si = null;

	public AppearanceMode() {
		super();
		
		Command cmdSelect = new Command("选择", Command.ITEM, 1);
		
		si = new StringItem("这是标签：", 
				"这是内容",
				Item.BUTTON);
		si.addCommand(cmdSelect);
		si.setItemCommandListener(this);
		form.append(si);
		
		Image img = null;
		try {
			img = Image.createImage("/boat.png");
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		if (img != null) {
			ii = new ImageItem("这是标签：",	//标签 
				img, 						//要显示的图像
				Item.LAYOUT_CENTER | 		//布局居中
				Item.LAYOUT_NEWLINE_BEFORE |
				Item.LAYOUT_EXPAND, 	
				null,						//图像不能显示时的提示文字
				Item.BUTTON);				//表面模式
			ii.addCommand(cmdSelect);
			ii.setItemCommandListener(this);
			form.append(ii);
		}
	}

	protected void startApp() throws MIDletStateChangeException {
		display = Display.getDisplay(this);
		display.setCurrent(form);
	}

	protected void pauseApp() {
		// TODO 自动生成方法存根
	}

	protected void destroyApp(boolean arg0)
		throws MIDletStateChangeException {
		// TODO 自动生成方法存根
	}

	public void commandAction(Command c, Item item) {
		if (item == si) {
			si.setLabel("文本按钮被按下了！");
			si.setLayout(Item.LAYOUT_EXPAND);
		} else if (item == ii) {
			ii.setLabel("图形按钮被按下了！");
		}
	}

}