Problem mit Listener

[Lucaaa]

Hallo!.
Ich habe ein Spiel mit einem Menü und dem eigentlichen Spiel.
Mein Problem ist das, wenn ich das Menü durch das Game-Play erstetze (CardLayout) mein KeyListener und wenn ich es anderrum versuche der ActionListener nicht mehr funktioniert.
Bitte dringend um Hilfe!
Vielen Dank schonmal!

Die Hauptklasse:

package com.ludevstudio.brickbreaker;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.text.Position;
public class Main extends JFrame implements ActionListener{
 GamePlay playGround = new GamePlay(this);
 GameEnd gameEnd = new GameEnd(playGround, this);
 Menu menu = new Menu();
 
 JPanel masterContainer = new JPanel();
 
 CardLayout layout = new CardLayout();
 
 
 
 public static void main(String[] args) {
  new Main();
  
 }
 
 
 public Main() {
  setSize(800, 800);
  setDefaultCloseOperation(EXIT_ON_CLOSE);
  setResizable(false);
  setFocusable(true);
  setLocationRelativeTo(null);
  setLayout(null);
  
  initComponents();
  
  setVisible(true);
 
  }
 public void initComponents() {
  masterContainer.setBounds(0, 0, 800, 800);
  masterContainer.setVisible(true);
  masterContainer.setFocusable(true);
  masterContainer.setLayout(layout);
  this.add(masterContainer);
  
  gameEnd.setBounds(0, 0, 800, 800);
  gameEnd.setFocusable(true);
  masterContainer.add(gameEnd, "gameend");
  
  playGround.setBounds(0, 0, 800, 800);
  playGround.setFocusable(true);
  masterContainer.add(playGround, "playground");
  
  
  
 }
 
 
  @Override
  public void actionPerformed(ActionEvent e) {
   
   
  }
   public void showGameEnd() {
    layout.show(masterContainer, "gameend");
   }
   
   public void showGamePlay() {
    layout.show(masterContainer, "playground");
   }
}

Die GamePlay Klasse

package com.ludevstudio.brickbreaker;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class GamePlay extends JPanel implements KeyListener, ActionListener  {
  Timer timer;
  int delay = 1;
  
  Boolean play = false;
  
  // Komponenten
  Player player;
  Border border;
  Ball ball;
  Levels levels;
  MapGenerator mapGen;
  
  Main mainFrame;
  
 public GamePlay(Main mainFrame) {
  this.mainFrame = mainFrame;
  
  setFocusable(true);
  addKeyListener(this);
  
  timer = new Timer(delay, this);
 timer.start();
  
  
  player = new Player();
  border = new Border();
  ball = new Ball(player);
  levels = new Levels();
  mapGen = new MapGenerator(levels.level1, levels.getLevel1Colors());
  
 }
 public void paint (Graphics g) {
  
  // Hintergrund
  g.setColor(Color.BLACK);
  g.fillRect(0, 0, this.getWidth(), this.getHeight());
  
  // Player
  player.draw((Graphics2D)g);
  
  // Border
  border.draw((Graphics2D)g);
  
  // Ball
  ball.draw((Graphics2D)g);
  
  // Map
  mapGen.draw((Graphics2D)g);
 
 }
 
 
 @Override
 
 public void actionPerformed(ActionEvent arg0) {
  timer.start();
  
 if(play) { 
  ball.move();
  ball.rebound();
  
  if(ball.getBall().y>800) {
   mainFrame.showGameEnd();
   
  }
  
 }
  
  repaint();
  
 }
 
 
 
 
 @Override
 public void keyPressed(KeyEvent e) {
  if(e.getKeyCode()==KeyEvent.VK_LEFT) {
   play = true;
   player.moveLeft();
   repaint();
  } else if(e.getKeyCode()==KeyEvent.VK_RIGHT) {
   play = true;
   player.moveRight();
   repaint();
  }
 
 }
 
 
 
 
 
 
 
 @Override
 public void keyReleased(KeyEvent e) {
  
 }
 @Override
 public void keyTyped(KeyEvent e) {
  
 }
 
}

Die Menu (noch GameEnd ist aber am Ende das gleiche) Klasse

package com.ludevstudio.brickbreaker;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class GameEnd extends JPanel implements ActionListener{
 JButton btnPlay, btnExit;
 JLabel labelTitle, labelSubTitle, labelCopyRight;
 
 
 Main mainFrame;
 GamePlay gamePlay;
 
 public GameEnd(GamePlay gamePlay, Main mainFrame) {
  this.mainFrame = mainFrame;
  this.gamePlay = gamePlay;
  
  setLayout(null);
  setBackground(Color.BLACK);
  setVisible(true);
  initComponents();
 }
 
 public void initComponents() {
  Font titleFont = new Font ("segoe script", Font.BOLD, 100);
  Font SubTitlefont = new Font("segoe script", Font.BOLD, 20);
  Font font = new Font("segoe script", Font.BOLD, 50);
  
  
  
  labelTitle = new JLabel("BrickBreaker");
  labelTitle.setBounds(0, 60, 800, 130);
  labelTitle.setHorizontalAlignment(JLabel.CENTER);
  labelTitle.setFont(titleFont);
  labelTitle.setForeground(Color.RED);
  this.add(labelTitle);
  
  labelSubTitle = new JLabel("powered by LuDev Studio");
  labelSubTitle.setBounds(0, 150, 800, 50);
  labelSubTitle.setHorizontalAlignment(JLabel.CENTER);
  labelSubTitle.setFont(SubTitlefont);
  labelSubTitle.setForeground(Color.CYAN);
  this.add(labelSubTitle);
  
  
  btnPlay = new JButton("Play");
  btnPlay.setBounds(300, 350, 200, 80);
  btnPlay.setFont(font);
  btnPlay.addActionListener(this);
  this.add(btnPlay);
  
  btnExit = new JButton("Exit");
  btnExit.setBounds(300, 470, 200, 80);
  btnExit.setFont(font);
  btnExit.addActionListener(this);
  this.add(btnExit);
  
  labelCopyRight = new JLabel("@2017 LuDev Studio - All rights reserved.");
  labelCopyRight.setBounds(0, 730, 800, 30);
  labelCopyRight.setHorizontalAlignment(JLabel.CENTER);
  labelCopyRight.setFont(SubTitlefont);
  labelCopyRight.setForeground(Color.CYAN);
  this.add(labelCopyRight);
 }
 
 
 @Override
 public void actionPerformed(ActionEvent e) {
  if(e.getSource()==btnPlay) {
   mainFrame.showGamePlay();
  } else if(e.getSource()==btnExit) {
   System.exit(0);
  }
  
 }
}