无法正确设置精灵动画-Android

Question

我正在尝试模拟游戏应用中角色的动作。

角色将接受四个方向（左，右，上，下）的移动。

当前，我使用2D Spritesheet（以我的情况为4行和列；每个Sprite的宽度= 58，高度= 79，因此整个Spritesheet的大小为232x316）来完成工作。 / p>

但是，当我尝试为角色设置动画时，动画只会迭代Spritesheet的第一行。如何让它在全部16个精灵中循环显示？

还是我应该在这种情况下使用4个单独的Spritesheet？

非常感谢任何输入！

public class MainActivity extends AppCompatActivity {

private GameView gameView;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    gameView = new GameView(this);
    setContentView(gameView);
}

@Override
protected void onResume() {
    super.onResume();
    gameView.resume();
}
@Override
protected void onPause() {
    super.onPause();
    gameView.pause();
}
class GameView extends SurfaceView implements Runnable {
    private Thread gameThread;
    private SurfaceHolder ourHolder;
    private volatile boolean playing;
    private Canvas canvas;
    private Bitmap bitmapRunningMan;
    private boolean isMoving;
    private float runSpeedPerSecond = 500;
    private float manXPos = 10, manYPos = 10;
    private int frameWidth = 58, frameHeight = 79;
    private int frameCount = 16;
    private int currentFrame = 0;
    private long fps;
    private long timeThisFrame;
    private long lastFrameChangeTime = 0;
    private int frameLengthInMillisecond = 100;
    private Rect frameToDraw = new Rect(0, 0, frameWidth, frameHeight);
    private RectF whereToDraw = new RectF(manXPos, manYPos, frameWidth, frameHeight);
    public GameView(Context context) {
        super(context);
        ourHolder = getHolder();
        bitmapRunningMan = BitmapFactory.decodeResource(getResources(), R.drawable.ninja);
        bitmapRunningMan = Bitmap.createScaledBitmap(bitmapRunningMan, frameWidth * frameCount, frameHeight * frameCount, false);
    }
    @Override
    public void run() {
        while (playing) {
            long startFrameTime = System.currentTimeMillis();
            update();
            draw();
            timeThisFrame = System.currentTimeMillis() - startFrameTime;
            if (timeThisFrame >= 1) {
                fps = 1000 / timeThisFrame;
            }
        }
    }
    public void update() {
        if (isMoving) {
            manXPos = manXPos + runSpeedPerSecond / fps;
            if (manXPos > getWidth()) {
                manYPos += (int) frameHeight;
                manXPos = 10;
            }
            if (manYPos + frameHeight > getHeight()) {
                manYPos = 10;
            }
        }
    }
    public void manageCurrentFrame() {
        long time = System.currentTimeMillis();
        if (isMoving) {
            if (time > lastFrameChangeTime + frameLengthInMillisecond) {
                lastFrameChangeTime = time;
                currentFrame++;
                if (currentFrame >= frameCount) {
                    currentFrame = 0;
                }
            }
        }
        frameToDraw.left = currentFrame * frameWidth;
        frameToDraw.right = frameToDraw.left + frameWidth;

    }
    public void draw() {
        if (ourHolder.getSurface().isValid()) {
            canvas = ourHolder.lockCanvas();
            canvas.drawColor(Color.WHITE);
            whereToDraw.set((int) manXPos, (int) manYPos, (int) manXPos + frameWidth, (int) manYPos + frameHeight);
            manageCurrentFrame();
            canvas.drawBitmap(bitmapRunningMan, frameToDraw, whereToDraw, null);
            ourHolder.unlockCanvasAndPost(canvas);
        }
    }
    public void pause() {
        playing = false;
        try {
            gameThread.join();
        } catch(InterruptedException e) {
            Log.e("ERR", "Joining Thread");
        }
    }
    public void resume() {
        playing = true;
        gameThread = new Thread(this);
        gameThread.start();
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN :
                isMoving = !isMoving;
                break;
        }
        return true;
    }
}

}