mycanvas.java

实现菜单 这只是主程序 ~~后面还有的~~是一个很经典的 实例

import java.io.IOException;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class MyCanvas extends Canvas {
	Image start,back,help,score;
	int y=60;
	//int action=0;
	MenuCanvas gc;
	private Display dis;
	NewGame newGame;
	ScoreGame scoreGame;
	AboutGame aboutGame;
	Display display;

	public MyCanvas(Display disp, MenuCanvas canvas) {
		dis=disp;	
		gc=canvas;
		newGame=new NewGame(dis,this);
		scoreGame=new ScoreGame(dis,this);
		aboutGame=new AboutGame(dis,this);
		
			try {
				start=Image.createImage("/start.png");
				back=Image.createImage("/back.png");
				help=Image.createImage("/help.png");
				score=Image.createImage("/score.png");
			} catch (IOException e) {
				// TODO 自动生成 catch 块
				e.printStackTrace();
			}
	// TODO 自动生成构造函数存根
}


	protected void paint(Graphics g) {
		// TODO 自动生成方法存根
		g.setColor(255,255,255);
		g.fillRect(0,0,getWidth(),getHeight());
		//if(action==0){
			drawMenu(g);
		/*}else if(action==1){
			drawGame(g);
		}else if(action==2){
			drawScore(g);
		}else if(action==3){
			drawHelp(g);
		}
		*/
	}
	private void drawMenu(Graphics g) {
		// TODO 自动生成方法存根
		g.drawImage(start,0,0,Graphics.TOP|Graphics.LEFT);
		g.setColor(255,250,250);
		g.drawRect(100,y,35,15);
		
		g.drawString("新游戏",100,60,Graphics.TOP|Graphics.LEFT);
		g.drawString("高分榜",100,80,Graphics.TOP|Graphics.LEFT);
		g.drawString("帮 助",100,100,Graphics.TOP|Graphics.LEFT);
		g.drawString("退 出",100,120,Graphics.TOP|Graphics.LEFT);
		
	}
	/*private void drawScore(Graphics g) {
		// TODO 自动生成方法存根
		g.drawImage(score,0,0,Graphics.TOP |Graphics.LEFT);
	}
	private void drawHelp(Graphics g) {
		// TODO 自动生成方法存根
		g.drawImage(help,0,0,Graphics.TOP |Graphics.LEFT);
		
	}

	private void drawGame(Graphics g) {
		// TODO 自动生成方法存根
		g.setColor(0,0,255);
		
	}
	*/



	protected void keyPressed(int keyCode){
		//if(action==0){
		if(keyCode==50 || keyCode==-1){
			if(y==60){
				y=120;
			}else{
				y=y-20;
			}
			
		}else if(keyCode==56 || keyCode==-2){
			if(y==120){
				y=60;
			}else {
				y=y+20;
			}
			
		}else if(keyCode==53||keyCode==-5){
			if(y==120){
			   gc.exit();
			}else if(y==100){
				dis.setCurrent(aboutGame);
			}else if(y==80){
				dis.setCurrent(scoreGame);
			}else if(y==60){
				dis.setCurrent(newGame);
			}
		}
	//}else{
		//action=0;
	//}
		repaint();	
	}

}