J2ME手机键盘测试例子

http://www.j2mehome.com 2009-07-01 20:17 点击: 我要评论()

摘要：今天有空，想想自己一个月前学习J2ME的时候，一直不知道如何编写监听手机键盘的代码，现在把我当时的想法写下来吧。先贴一个入门级别的代码，再分析： package com.srk.local.key; imp
Tags：手机例子 void 键盘

今天有空，想想自己一个月前学习J2ME的时候，一直不知道如何编写监听手机键盘的代码，现在把我当时的想法写下来吧。

先贴一个入门级别的代码，再分析：

package com.srk.local.key;

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;

public class KeyActionMIDlet extends MIDlet implements CommandListener {
    private Command exitCommand;
    private MainCanvas currentDisplay;
    public KeyActionMIDlet() {
        currentDisplay = new MainCanvas();
        exitCommand = new Command("退出", Command.EXIT, 1);
    }

    protected void startApp() throws MIDletStateChangeException {
        System.out.println("startApp()!");
        currentDisplay.addCommand(exitCommand);
        new Thread(currentDisplay).start();
        currentDisplay.setCommandListener(this);
        Display.getDisplay(this).setCurrent(currentDisplay);
    }

    protected void pauseApp() {
        System.out.println("pauseApp()!");
    }

    protected void destroyApp(boolean _boolean) throws
            MIDletStateChangeException {
        System.out.println("destroyApp()!");
    }

    public void commandAction(Command command, Displayable displayable) {
        if (command == exitCommand) {
            try {
                destroyApp(false);
                notifyDestroyed();
            } catch (MIDletStateChangeException e) {
                e.printStackTrace();
            }
        }
    }

}

class MainCanvas extends Canvas implements Runnable {
    private String buttonPressed;
    private boolean leftPressed, rightPressed, upPressed, downPressed;
    private int px, py, pu, pd;
    public MainCanvas() {
        init();
    }

    public void paint(Graphics g) {
        g.setColor(0xFFFFFF);
        g.fillRect(0, 0, this.getWidth(), this.getHeight());
        g.setColor(0x000000);
        g.drawString(buttonPressed, this.getWidth() / 2, this.getHeight() / 2,
                     Graphics.LEFT | Graphics.TOP);
        g.drawString("J2ME", px, py, Graphics.HCENTER | Graphics.TOP);
    }

public void run() {