J2ME RPG游戏开发 精灵帧序列
最近开发一款手机游戏  调用精灵的nextframe方法却只能循环到第二帧 请大家帮忙看下 谢啦

  



public class Game extends GameCanvas implements Runnable{

	private Sprite s,p;

	

	private LayerManager lm;

	private Image imgbg;

	private Image imgp;

	private int px,py;

	public Graphics offg;

	public int[] FRAME_SEQUENCE_DOWN={0, 1, 2, 3};

	public int[] FRAME_SEQUENCE_UP={12,13,14,15};

	public int[] FRAME_SEQUENCE_LEFT={4, 5, 6, 7};

	public int[] FRAME_SEQUENCE_RIGHT={8,9,10,11 };



	public Game() {

		super(true);

		px=12;

		py=23;

		lm=new LayerManager();

		try {

			imgbg=Image.createImage("/bg.png");

			imgp=Image.createImage("/frames.png");

		} catch (IOException e) {}	

		s=new Sprite(imgbg);

		p=new Sprite(imgp,24,36);

		

		lm.append(p);

		lm.append(s);

		lm.setViewWindow(0, 0, getWidth(), getHeight());

		offg=this.getGraphics();

		(new Thread(this)).start();

	}

	public void run() {

		while(true){

			input();

			

			offg.setColor(255);

			offg.fillRect(0,0,getWidth(),getHeight());

			lm.paint(offg,0, 0);

			

			paint();

			 try {

				Thread.currentThread();

				Thread.sleep(200);

			} catch (InterruptedException e) {

				

				e.printStackTrace();

			}

		}

		

	}

	public void paint(){

		this.flushGraphics();

	}

	public void input(){

		

		int k=this.getKeyStates();

		System.out.println("k="+k);

		if((k&GameCanvas.DOWN_PRESSED)>0){

			int[] FRAME_SEQUENCE_DOWN={0, 1, 2};

			p.setFrameSequence(FRAME_SEQUENCE_DOWN);

			p.nextFrame();

			System.out.println(p.getFrame());

			p.move(0, 4);

		}

		if((k&GameCanvas.UP_PRESSED)>0){

			p.setFrameSequence(FRAME_SEQUENCE_UP);

			p.nextFrame();

			p.move(0, -4);

		}

		if((k&GameCanvas.LEFT_PRESSED)>0){

			p.setFrameSequence(FRAME_SEQUENCE_LEFT);

			p.nextFrame();

			p.move(-4, 0);

		}

		if((k&GameCanvas.RIGHT_PRESSED)>0){

			p.setFrameSequence(FRAME_SEQUENCE_RIGHT);

			p.nextFrame();

			p.move(4,0);

		}

		if((k&GameCanvas.FIRE_PRESSED)>0){

			boolean vis=p.isVisible();

			p.setVisible(!vis);

		}

	}

}

------解决方案--------------------
input 是一直在执行的 但是不会进入到if语句里面  J2ME有这样一个机制问题 就是你一直按键但是键值只是第一次才是你想要的键值  System.out.println(p.getFrame()); 应该只打印了一遍 要想实现效果的话  应该在keyPressed里面去定义k