drawcanvas.java

几个不错的手机程序例子

/*
 * DrawCanvas.java
 *
 * Copyright 2001 SkyArts. All Rights Reserved.
 */
import javax.microedition.lcdui.*;

/**
 * 输入按键的KeyCode显示所用的Canvas类
 *
 * @author  Hideki Yonekawa
 * @version 1.0
 */
class DrawCanvas extends Canvas {
	/** 存放keycode字符串的变量 */
	private String	keyCodeSt;

	/** 构造函数 */
	DrawCanvas() {}

	/** 按下按键时所调用的方法 */
	protected void keyPressed(int keyCode) {
		keyCodeSt = String.valueOf(keyCode);
		repaint();
	}

	/** 进行描绘的方法 */
	protected void paint(Graphics g) {
		//背景涂白
		g.setColor(0x00FFFFFF);
		g.fillRect(0, 0, getWidth(), getHeight());

		//色彩指定为黑色
		g.setColor(0x00000000);
		//描绘出文本
		g.drawString("KeyCode:" + keyCodeSt, 0, 0, Graphics.TOP|Graphics.LEFT);
	}
}