Java游戏精灵卡住

Question

只要我通过CardLayout切换到另一个JPanel，我遇到卡住精灵的问题。

import java.awt.CardLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.ArrayList; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 

public class Game extends JFrame implements Runnable { 

    private viewA v1; 
    private viewB v2; 
    private viewC v3; 
    private viewD v4; 
    private Player player; 
    private CardLayout c1; 
    private JPanel contPanel; 

    // ############## VIEW A BUTTONLISTENER 
    public class ViewAButtonList implements ActionListener{ 

     public void actionPerformed(ActionEvent ev){ 
      try{ 
      c1.show(contPanel, "1"); 

      } catch (Exception ex){ 

      ex.printStackTrace(); 
      } 

     } 


    } 
    // ############## VIEW B BUTTON LISTENER 
    public class ViewBButtonList implements ActionListener{ 

     public void actionPerformed(ActionEvent ev){ 
      try{ 
      c1.show(contPanel, "2"); 

      } catch (Exception ex){ 

      ex.printStackTrace(); 
      } 

     } 


    } 
    // ############## VIEWC BUTTON ACTIONEVENT 
    public class ViewCButtonList implements ActionListener{ 

     public void actionPerformed(ActionEvent ev){ 
      try{ 
      c1.show(contPanel, "3"); 

      } catch (Exception ex){ 

      ex.printStackTrace(); 
      } 

     } 


    } 
    // ############## VIEW D BUTTON ACTION EVENT 
    public class ViewDButtonList implements ActionListener{ 

     public void actionPerformed(ActionEvent ev){ 
      try{ 
      c1.show(contPanel, "4"); 

      } catch (Exception ex){ 

      ex.printStackTrace(); 
      } 

     } 


    } 





    public Game() { 
     player = new Player(); 
     // load player settings from server 
     // .. 
     // contPanel = new JPanel(); 
    //load views v1 = new ViewA(Player); v2=new ViewB(Player); v3 = new ViewC(Player); v4 =new ViewD(Player); 

    c1 = new CardLayout(); 

    contPanel.setLayout(c1); 


    contPanel.add(v1,"1"); 

    contPanel.add(v2,"2"); 

    contPanel.add(v3"3"); 

    contPanel.add(v4,"4"); 

     c1.show(contPanel, "2"); 
     currPos =2; 

     this.add(contPanel); 

     setSize(652, 480); 
     setLocationRelativeTo(null); 
     setTitle("GAME"); 
     setResizable(false); 
     setVisible(true);//go to end of view B (x=0), change to View A, close view B 


     // Create 4 of each button to place in each seperate view (to swtich back and forth) 
     // ................ 


    } 

    public static void main(String[] args) { 
     javax.swing.SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       new Game(); 
      } 
     }); 
    } 

    @Override public void run() {   // TODO Auto-generated method stub 
    } } 

现在..一切从画面进行切换的角度来看的作品..但我的球员精灵被开关卡住后在屏幕上，但在最初的负荷，我可以用方向键左右移动的精灵。我不确定在新的ViewA（播放器）上传递播放器可能是罪魁祸首..但我有一种感觉，那就是......无法弄清楚我做错了什么..

这里是播放器：

import java.awt.Image; import java.awt.Rectangle; import java.awt.event.KeyEvent;

import java.util.ArrayList;

import javax.swing.ImageIcon;

公共类播放器{

private String playersprite = "playersprite.png"; 

private int dx; 
private int dy; 
private int x; 
private int y; 
private int width; 
private int height; 
private boolean isFired; 
private boolean visible; 
private Image image; 
private ArrayList missiles; 


public Player() { 
    ImageIcon ii = new ImageIcon(this.getClass().getResource(playersprite)); 
    image = ii.getImage(); 
    width = image.getWidth(null); 
    height = image.getHeight(null); 
    missiles = new ArrayList(); 
    visible = true; 
    isFired=false; 
    //default spawn location 
    x = 600; 
    y = 400; 
} 


public void move() { 

    x += dx; 
    y += dy; 


    if(x<=0){x=0;}  if(x>=640-20){x=640-20;}  if(y<=0){y=0;} 
    if(y>=400){y=400;} 
} 

public int getX() { 
    return x; 
} 

public int getY() { 
    return y; 
} 

public void setX(int x){ 
    this.x=x; 
} 
public void setY(int y){ 
    this.y=y; 
} 

public Image getImage() { 
    return image; 
} 

public ArrayList getMissiles() { 
    return missiles; 
} 

public void setVisible(boolean visible) { 
    this.visible = visible; 
} 

public boolean isVisible() { 
    return visible; 
} 

public Rectangle getBounds() { 
    return new Rectangle(x, y, 32, 32); 
} 


public void keyPressed(KeyEvent e) { 

    System.out.println("X: "+x+",Y: "+y); 


    int key = e.getKeyCode(); 

    if (key == KeyEvent.VK_SPACE) { 
     if(isFired==false){ 
      isFired=true; 
     fire(); 
     } else return; 
    } 

    if (key == KeyEvent.VK_LEFT) { 
     dx = -2; 
    } 

    if (key == KeyEvent.VK_RIGHT) { 
     dx = 2; 
    } 

    if (key == KeyEvent.VK_UP) { 
     dy = -2; 
    } 

    if (key == KeyEvent.VK_DOWN) { 
     dy = 2; 
    } 
} 

public void fire() { 

    System.out.println("Player used weapon"); 
    // missiles.add(new Missile(x, y)); 
} 

public void keyReleased(KeyEvent e) { 
    int key = e.getKeyCode(); 

    if (key == KeyEvent.VK_LEFT) { 
     dx = 0; 
    } 

    if (key == KeyEvent.VK_RIGHT) { 
     dx = 0; 
    } 

    if (key == KeyEvent.VK_UP) { 
     dy = 0; 
    } 

    if (key == KeyEvent.VK_DOWN) { 
     dy = 0; 
    } 
    if (key == KeyEvent.VK_SPACE) { 
     isFired=false; 
    } 
} } 

Answer 1

KeyListener要求他们注册的组件都可获得焦点，并有重点，这意味着当您单击有点像JButton焦点移动到按钮与组分一个KeyListener不再有键盘焦点，因此将不再接收关键事件。

相反，我们建议您使用Key Bindings作为这个API必须克服这些局限性