java - KeyListener 不工作？

Question

好的，所以我的游戏有这个关键监听器，但它不起作用，但是当我创建一个新项目只是为了测试它是否对我有用时？所以这是我的游戏的一些代码:

public class GameKeyListener implements KeyListener {

private void pressMainWeapon() {
     Constants.MAIN_WEAPON_PRESSED = Constants.MAIN_WEAPON_PRESSED ? true : false;
    }

    private void pressSecondaryWeapon() {
     Constants.SECONDARY_WEAPON_PRESSED = Constants.SECONDARY_WEAPON_PRESSED ? true : false;
    }

    private void pressSkillsButton() {
        Constants.SKILLS_BUTTON_PRESSED = Constants.SKILLS_BUTTON_PRESSED ? true : false;
    }

       private void gameKeyPressed(int keyCode) {

              switch (keyCode) {      

                 case KeyEvent.VK_Q:
                     pressMainWeapon();
                    break;

                 case KeyEvent.VK_E:
                     pressSecondaryWeapon();
                     break;

                 case KeyEvent.VK_TAB:
                     pressSkillsButton();
                     break;

                 case KeyEvent.VK_W:
                     Constants.CHARACTER_Y -= 5;
                     break;

                 case KeyEvent.VK_A:
                     Constants.CHARACTER_X -= 5;
                     break;

                 case KeyEvent.VK_S:
                     Constants.CHARACTER_Y += 5;
                     break;

                 case KeyEvent.VK_D:
                     Constants.CHARACTER_X += 5;
                     break;

              }
           }

    private void gameKeyReleased(int keyCode) {  

    }

    private void gameKeyTyped(char keyChar) {  

    }

    @Override
    public void keyPressed(KeyEvent e) {
        gameKeyPressed(e.getKeyCode());
        System.out.println(e.getKeyChar());
    }

    @Override
    public void keyReleased(KeyEvent e) {
        gameKeyReleased(e.getKeyCode());
    }

    @Override
    public void keyTyped(KeyEvent e) {
        gameKeyTyped(e.getKeyChar());
    }

和

public class GraphicsMain {

static JFrame f = new JFrame("Gurillia");

private static GameCanvas gc = new GameCanvas();

public static void startGraphics() throws IOException {
    f.setVisible(true);     
    f.setIgnoreRepaint(true);

    f.setContentPane(gc);
    gc.setPreferredSize(new Dimension(Constants.GAME_WIDTH, Constants.GAME_HEIGHT));        

    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.pack();
    f.setResizable(false);

    f.addKeyListener(new GameKeyListener());
}

但这确实有效:

public class testkeylistener implements KeyListener {

@Override
public void keyPressed(KeyEvent arg0) {
    System.out.println(arg0.getKeyChar());
}

@Override
public void keyReleased(KeyEvent arg0) {
    // TODO Auto-generated method stub

}

@Override
public void keyTyped(KeyEvent arg0) {
    // TODO Auto-generated method stub

}

public static void main(String args[]) {
    JFrame f = new JFrame("test");
    f.setSize(1000,1000);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
    f.pack();
    f.addKeyListener(new testkeylistener());
}

那么问题是什么？

Answer 1

问题是您使用 KeyListener，而 Swing 被设计为使用 KeyBindings .差异可能是由于不同的焦点行为。

参见示例 this question KeyListener 只是偶尔工作