Java 这个键绑定有什么问题？

为什么当我按W或D时它会上升

有什么问题

---

D应该向右

您正在覆盖动作图中的值，因为您在向上和向右动作中使用了相同的动作名称“pressed”

public void buttons(){
     int c = WHEN_IN_FOCUSED_WINDOW;

        Action right = new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                player.setVX(2);
            }
        };
        Action stop = new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                player.setVX(0);
                player.setVY(0);
            }
        };

        Action up = new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                player.setVY(-2);
            }
        };
           getInputMap(c).put(KeyStroke.getKeyStroke("D"), "pressed");
           getActionMap().put("pressed", right);
           getInputMap(c).put(KeyStroke.getKeyStroke("released D"), "released");
           getActionMap().put("released", stop);
           getInputMap(c).put(KeyStroke.getKeyStroke("W"), "pressed");
           getActionMap().put("pressed", up);
           getInputMap(c).put(KeyStroke.getKeyStroke("released W"), "released");
           getActionMap().put("released", stop);

 }

应通过以下方式解决此问题：

getInputMap(c).put(KeyStroke.getKeyStroke("D"), "pressed");
getActionMap().put("pressed", right);
getInputMap(c).put(KeyStroke.getKeyStroke("released D"), "released");
getActionMap().put("released", stop);
getInputMap(c).put(KeyStroke.getKeyStroke("W"), "pressed");
getActionMap().put("pressed", up); // this overwrites the "pressed" action name above with the up action
getInputMap(c).put(KeyStroke.getKeyStroke("released W"), "released");
getActionMap().put("released", stop); // similarly, this is redundant because you have the same thing above

---

您正在覆盖动作图中的值，因为您对向上和向右动作使用相同的动作名称“按下”

public void buttons(){
     int c = WHEN_IN_FOCUSED_WINDOW;

        Action right = new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                player.setVX(2);
            }
        };
        Action stop = new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                player.setVX(0);
                player.setVY(0);
            }
        };

        Action up = new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                player.setVY(-2);
            }
        };
           getInputMap(c).put(KeyStroke.getKeyStroke("D"), "pressed");
           getActionMap().put("pressed", right);
           getInputMap(c).put(KeyStroke.getKeyStroke("released D"), "released");
           getActionMap().put("released", stop);
           getInputMap(c).put(KeyStroke.getKeyStroke("W"), "pressed");
           getActionMap().put("pressed", up);
           getInputMap(c).put(KeyStroke.getKeyStroke("released W"), "released");
           getActionMap().put("released", stop);

 }

应通过以下方式解决此问题：

getInputMap(c).put(KeyStroke.getKeyStroke("D"), "pressed");
getActionMap().put("pressed", right);
getInputMap(c).put(KeyStroke.getKeyStroke("released D"), "released");
getActionMap().put("released", stop);
getInputMap(c).put(KeyStroke.getKeyStroke("W"), "pressed");
getActionMap().put("pressed", up); // this overwrites the "pressed" action name above with the up action
getInputMap(c).put(KeyStroke.getKeyStroke("released W"), "released");
getActionMap().put("released", stop); // similarly, this is redundant because you have the same thing above

---

您确定是键绑定而不是

setVX

方法吗？将调试语句添加到每个

actionPerformed

方法中，查看按

D

是否实际调用

setVX

（通过

actionPerformed

方法）是的，我的setVX是正确的，但当我摆脱setVY actionPerformed之后，我的VX工作就完成了。。我不知道为什么当我放弃我的VY性能时它会起作用。试着向每个

actionPerformed

方法添加调试语句，看看调用了什么以及调用的顺序。我想这可能与你的

停止

操作有关。我不知道执行的操作有什么问题。。可能它只接受两个actionperform not 3您确定这是键绑定而不是

setVX

方法吗？将调试语句添加到每个

actionPerformed

方法中，查看按

D

是否实际调用

setVX

（通过

actionPerformed

方法）是的，我的setVX是正确的，但当我摆脱setVY actionPerformed之后，我的VX工作就完成了。。我不知道为什么当我放弃我的VY性能时它会起作用。试着向每个

actionPerformed

方法添加调试语句，看看调用了什么以及调用的顺序。我想这可能与你的

停止

操作有关。我不知道执行的操作有什么问题。。也许它只接受两个动作，而不是三个动作