Question

我试图处理最多五个并发的keyPressed事件。

我已尝试分别侦听keyPressed和keyReleased事件以及从ArrayList添加/删除keyCodes。这适用于两个键，有时三个，但不止于此，并且在当前按下的键发生keyReleased事件之前不再注册keyPressed事件：

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;

public class KeyboardHandler implements KeyListener {
public static ArrayList<Integer> keys = new ArrayList<Integer>();

public void keyTyped(KeyEvent e) {

}

public void keyPressed(KeyEvent e) {

    // System.out.println("Key pressed: " + e.getKeyCode());

    if (!keys.contains((Integer) e.getKeyCode())) {
        keys.add((Integer) e.getKeyCode());
        // System.out.println("Key added to keylist: " + e.getKeyCode());
    }


}

public void keyReleased(KeyEvent e) {
    // System.out.println("Key released: " + e.getKeyCode());

    if (keys.contains((Integer) e.getKeyCode())) {
        keys.remove((Integer) e.getKeyCode());
        // System.out.println("Key removed from keylist: " + e.getKeyCode());
    }
}

public static void handleKeyInput() {
// I then go on to handle the items in the array list appropriately 
//using this method that is called by a thread.

我得出的结论是，这与使用arraylist无关，因此最终查看了键绑定。据我所知，关键绑定是处理关键事件的更好方法。但是，我的问题仍然存在，在释放当前按下的键之前，按下的键不会超过三个：

import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.KeyStroke;

import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;

public class KeyBinding extends JComponent{
    public KeyBinding(){

        InputMap im = this.getInputMap(WHEN_IN_FOCUSED_WINDOW);
        ActionMap am = getActionMap();

        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_W, 0, false), "w_pressed");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_W, 0, true), "w_released");

        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, 0, false), "a_pressed");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, 0, true), "a_released");

        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_S, 0, false), "s_pressed");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_S, 0, true), "s_released");

        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_D, 0, false), "d_pressed");
        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_D, 0, true), "d_released");

        am.put("w_pressed", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("W key is pressed");
            }


        });

        am.put("w_released", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("W key is released");
            }


        });

        am.put("a_pressed", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("A key is pressed");
            }


        });

        am.put("a_released", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("A key is released");
            }


        });

        am.put("s_pressed", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("S key is pressed");
            }


        });

        am.put("s_released", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("S key is released");
            }


        });

        am.put("d_pressed", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("D key is pressed");
            }


        });

        am.put("d_released", new AbstractAction(){

            public void actionPerformed(ActionEvent e) {
                System.out.println(" key is released");
            }


        });
    }
}

我在Mac上运行Eclipse，可能是某些特定于操作系统的错误，还是我做错了什么？我只学习了几个星期的Java，这让我很难过。我讨厌询问非特定问题，只是发布代码块 - 我似乎很懒，但我已经尝试过但未能自己解决这个问题 - 所有的帮助都得到了大量的赞赏。

KeyListener和Key Bindings都不会处理多个键事件

0 个答案: