aboutmenu.java

本程序用JavaME语言描述了一个运行在手机上的电子书系统

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.ImageItem;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.StringItem;


public class AboutMenu extends Form implements CommandListener {
	
	private static TxtReader bookReader = null;
	private ImageItem ico = null;
	private StringItem info = null;
	private StringItem arr = null;
	private final static Command CMD_BACK = new Command("返回", Command.BACK,1);
	//...
	
	public AboutMenu(TxtReader tr){
		super("帮助");
		bookReader = tr;
		Image temp = null;
		try{
			temp = Image.createImage("/icon/icon.png");
		}catch(Exception e){
			e.printStackTrace();
		}
		ico = new ImageItem(null,temp,Item.LAYOUT_CENTER|Item.LAYOUT_TOP|Item.LAYOUT_2,null);
		info = new StringItem(null,"EBookReader final 1.0");
		arr = new StringItem(null,"All Rights Reserved");
		info.setLayout(Item.LAYOUT_CENTER|Item.LAYOUT_TOP|Item.LAYOUT_2);
		arr.setLayout(Item.LAYOUT_CENTER|Item.LAYOUT_TOP|Item.LAYOUT_2);
		this.append(ico);
		this.append(info);
		this.append(arr);
		this.addCommand(CMD_BACK);
		this.setCommandListener(this);
	}
	
	private void back(){
		Display.getDisplay(bookReader).setCurrent(bookReader.getDisplayable(TxtReader.MAINMANU));
	}
	
	
	//...

	public void commandAction(Command c, Displayable d) {
		if(c == CMD_BACK){
			back();
		}
	}

}