Java 按下按键后立即继续运动？

Question

好吧，当我按下任意键箭头时，红色框会移动，是的，它移动 10px，然后停止 1 秒并继续移动，而不是立即移动而不停止。

发生问题的示例:

_{(来源:gyazo.com)}

你能看到它是如何停止 1 或 0.5 秒然后继续的吗？

如何修复它？

我正在使用KeyEventDispatcher

我的按键检测:

整个源代码:

public class Game extends Frame {

    private class Keyboard implements KeyEventDispatcher {

        private Game game;

        public Keyboard(Game game) {
            this.game = game;
        }

        @Override
        public boolean dispatchKeyEvent(KeyEvent e) {
            if (e.getID() == KeyEvent.KEY_PRESSED) {
                this.movement(e);
            } else if (e.getID() == KeyEvent.KEY_RELEASED) {
            } else if (e.getID() == KeyEvent.KEY_TYPED) {
            }
            return false;
        }

        public void movement(KeyEvent e) {
            int keyCode = e.getKeyCode();
            switch( keyCode ) { 
                case KeyEvent.VK_UP:
                    game.movePlayer(0, -10);
                    break;
                case KeyEvent.VK_DOWN:
                    game.movePlayer(0, 10);
                    break;
                case KeyEvent.VK_LEFT:
                    game.movePlayer(-10, 0);
                    break;
                case KeyEvent.VK_RIGHT :
                    game.movePlayer(10, 0);
                    break;
             }
        }   
    }

    private static final long serialVersionUID = 1L;

    private int coordinateX = 1;
    private int coordinateY = 1;

    public int width = 300;
    public int height = width / 16 * 9;
    public int scale = 3;   
    public int mouseY = MouseInfo.getPointerInfo().getLocation().y;
    public int mouseX = MouseInfo.getPointerInfo().getLocation().x; 
    private Player player = new Player(0, 0);

    public Game() {
        Dimension size = new Dimension(width * scale, height * scale);
        setPreferredSize(size);     
        frame.setSize(width, height);
        frame.setResizable(false);
        frame.setTitle("First game");
        JPanel j = new JPanel();
        j.setVisible(true);
        JLabel text = new JLabel("coords");
        j.add(text);
        frame.add(this);
        frame.pack();
        frame.add(j);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
        manager.addKeyEventDispatcher(new Keyboard(this));      
    }

    private void movePlayer(int x, int y) {
        /**
         * Main region area
         */

        int pX = 0, pY = 0;
        if (y == 0) { // x
            if (player.getX() + x + 100 > frame.getContentPane().getWidth() || player.getX()  + x < 0) {
                if (player.getX() + x < 0) {
                    player.setX(0);
                    return;
                }
                if (player.getX() + x > 0) {
                    player.setX(frame.getContentPane().getWidth() - 100);
                    return;
                }
                return;
            }

            pX = x;

        }
        else if (x == 0) { // y
            if (player.getY() + y + 100 > frame.getContentPane().getHeight() || player.getY()  + y < 0) {
                if (player.getY() + y < 0) {
                    player.setY(0);
                    return;
                }               
                if (player.getY() + y > 0) {
                    player.setY(frame.getContentPane().getHeight() - 100);
                    return;
                }
                return;
            }        
            pY = y;
        }

        player.updatePosition(pX, pY);
    }  

    public void update() {

    }

    public void render() {
        bs = getBufferStrategy();
        if (bs == null) {
            createBufferStrategy(3);
            return;
        }
        g = bs.getDrawGraphics();
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, getWidth(), getHeight());

        g.setColor(Color.RED);
        g.fillRect(player.getX(), player.getY(), 100, 100);
        g.dispose();
        bs.show();
    }   

}

框架.java:

public class Frame extends Canvas {

    public static final long serialVersionUID = 8L;

    public static JFrame frame = new JFrame();
    public static Threads thread;
    public static Game game;
    public Graphics g;
    public BufferStrategy bs;


    /**
     * @param args
     */

    public static void main(String[] args) {
        thread = new Threads(new Game());
        thread.start();
    }
}

Answer 1

问题在于 KeyStrokes 的重复率。这是由操作系统控制的。

解决方案是使用 Swing Timer 在按下按键后立即安排动画。

参见Motion Using the Keyboard了解更多信息和完整的工作示例。

此外，您不应该使用 KeyListener，而应该使用 KeyBindings。