mygamecanvas.java

j2me实例代码

package game;

import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

public class MyGameCanvas extends GameCanvas implements Runnable {

	public MyGameCanvas(){
		super(true);
	}
	boolean conti=true;
	int rate=0;
	public void run(){
		long st=0;
		long et=0;
		Graphics g=this.getGraphics();
		while(conti){
			st=System.currentTimeMillis();
			input();
			render(g);
			et=System.currentTimeMillis();
			if((et-st)<rate){
				try{
					Thread.sleep(rate-(et-st));
				}catch(Exception e){}
			}
			
		}
	}
	int x=50;
	int y=10;
	public void input(){
		int keystate=this.getKeyStates();
		if((keystate & UP_PRESSED)!=0){
			y=y-2;
		}else if((keystate & DOWN_PRESSED)!=0){
			y=y+2;
		}
	}
	public void render(Graphics g){
		g.setColor(255,255,255);
		g.fillRect(0,0,getWidth(),getHeight());
		g.setColor(0,0,0);
		g.drawString("Test",x,y,0);
		x++;
		if(x>getWidth())
			x=0;
		flushGraphics();
	}
	public void start(){
		Thread t=new Thread(this);
		t.start();
	}
	public void exit(){
		conti=false;
	}
	public void keyPressed(int keycode){
		System.out.println("key events");
	}

}