Programming a Custom User Interface - Beginning J2ME: From Novice to Professional - page 245

import javax.microedition.lcdui.*;
public class KeyCanvas
extends Canvas {
private Font mFont;
private String mMessage = "[Press keys]";
public KeyCanvas() {
mFont = Font.getFont(Font.FACE_PROPORTIONAL,
Font.STYLE_PLAIN, Font.SIZE_MEDIUM);
}
public void paint(Graphics g) {
int w = getWidth();
int h = getHeight();
// Clear the Canvas.
g.setGrayScale(255);
g.fillRect(0, 0, w - 1, h - 1);
g.setGrayScale(0);
g.drawRect(0, 0, w - 1, h - 1);
g.setFont(mFont);
int x = w / 2;
int y = h / 2;
g.drawString(mMessage, x, y, Graphics.BASELINE | Graphics.HCENTER);
}
protected void keyPressed(int keyCode) {
int gameAction = getGameAction(keyCode);
switch(gameAction) {
case UP: mMessage = "UP"; break;
case DOWN: mMessage = "DOWN"; break;
case LEFT: mMessage = "LEFT"; break;
case RIGHT: mMessage = "RIGHT"; break;
case FIRE: mMessage = "FIRE"; break;
case GAME_A: mMessage = "GAME_A"; break;
case GAME_B: mMessage = "GAME_B"; break;
case GAME_C: mMessage = "GAME_C"; break;
case GAME_D: mMessage = "GAME_D"; break;
default: mMessage = ""; break;
}
repaint();
}
}