Question

我试图根据按下的箭头键移动我的照片，但是按键侦听器没有检测到任何按键。我附加了面板的代码，我添加到驱动程序中的框架。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;

public class RacePanel extends JPanel
{
//variables
private ImageIcon backGround = new ImageIcon("images/back.png");
private Penguin p;
private ImageIcon icon1 = new ImageIcon("images/PenguinR.png");
private ImageIcon icon2 = new ImageIcon("images/PenguinL.png");
private int x = 10;
//move left and right methods
public void moveLeft(Penguin x)
{
   x.setImageIcon(icon2);
  x.setX(x.getX() - 5);

}
public void moveRight(Penguin x)
{
  x.setImageIcon(icon1);
  x.setX(x.getX() + 5);

}




public RacePanel()
{  
  JPanel RacePanel = new JPanel();  
  super.addKeyListener(new Key());
  setFocusable(true);
  p = new Penguin();
  Timer t = new Timer(50, new Listener());
  t.start();

}

 private class Key implements KeyListener
 {
  public Key()
  { 
     addKeyListener(this);
  }

  public void keyTyped(KeyEvent e)
  {
  }

  public void keyPressed(KeyEvent e)
  {

     if(e.getKeyCode() == KeyEvent.VK_RIGHT)
     {
        moveRight(p);
     }
     if(e.getKeyCode() == KeyEvent.VK_LEFT)
     {
        moveLeft(p);
     }   
     if(e.getKeyCode() == KeyEvent.VK_UP)
     {
        System.out.println("i am listening");
     }
     repaint();         
    }

    public void keyReleased(KeyEvent e)
   {   


   }
   }


   //graphics
  public void paintComponent(Graphics g)
  {
  g.drawImage(backGround.getImage(),0,0,800,600,null);
  g.drawImage(p.getImageIcon().getImage(),p.getX(),p.getY(),50,100,null);
  }
  //action listener .05 second loop
   private class Listener implements ActionListener
  {
  public void actionPerformed(ActionEvent e)
  {

     repaint();  
  }
  }



  }

我知道它没有识别按键，因为我添加了一行代码来打印＆＃34;我正在倾听＆＃34;如果按下向上箭头并且没有打印任何内容。我也知道问题不是因为计时器导致我通过将moveRight方法添加到actionPerformed方法来测试它。

关键听众没有检测到按键？

0 个答案: