的KeyListener沒有在Java中

Question

正常工作，我有關於Java與用於鍵收聽類KeyListener相關的問題。在我的應用程序中，我首先用JavaFX工具包展示了一個介紹性視頻。我設置用於視頻JFXPanel一個KeyListener，它做工精細，它能夠讀取我在鍵盤按下，而視頻正在播放的按鍵。但問題是，當影片結束（可能是因爲它完成播放，因爲我通過使中斷線程按「逃生」鍵停止），我嘗試將新KeyListener添加到應用程序的主JFrame和我無法從中讀取任何密鑰。

你也應該問自己，爲什麼我添加了一個KeyListener到JFXPanel，然後視頻結束後我添加了一個新的KeyListener到應用程序的主JFrame，而不是隻有一個KeyListener從一開始就加入到JFrame。原因是，如果我這樣做，那麼我無法讀取任何按鍵，而在視頻播放，所以有人建議我加入KeyListener到JFXPanel。

這裏是我的應用程序的所有代碼：

/** 
* Main class of the application. 
*/ 
public class Main{ 

    // Define the variable for the window of the game. 
    public static JFrame window; 

    // Define the variable for the introductory video. 
    public static MediaPlayer video; 

    // Define the variable for a thread. 
    public static Thread thread; 

    /** 
    * Main function of the application. 
    */ 
    public static void main(String[] args){ 

    // Create a Swing thread. 
    SwingUtilities.invokeLater(new Runnable(){ 

     @Override 
     public void run(){ 

     // Prevent the JavaFX toolkit from closing. 
     Platform.setImplicitExit(false); 

     // Create the window of the game. 
     window = new JFrame(); 

     // Set the title. 
     window.setTitle("Chip"); 

     // Set the resolution as 1920 x 1280. 
     window.setSize(1926,1343); 

     // Set the location as in the middle of the screen. 
     window.setLocationRelativeTo(null); 

     // Set the operation when the window closes. 
     window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     // Disable the maximization and resizable mode. 
     window.setResizable(false); 

     // Show the window. 
     window.setVisible(true); 

     // Create a key listener. 
     KeyListener keyListener = createKeyListener(); 

     // Create a JavaFX panel. 
     JFXPanel panelJavaFX = new JFXPanel(); 

     // Add the key listener to the JavaFX panel. 
     panelJavaFX.addKeyListener(keyListener); 

     // Create a JavaFX thread. 
     Platform.runLater(new Runnable(){ 

      @Override 
      public void run(){ 

      // Create a new thread. 
      thread = new Thread(new Runnable(){ 

       public void run(){ 

       try{ 

        // Show the introductory video. 
        showVideo(panelJavaFX); 

        // Pause the execution of the application for 30 seconds (duration of the introductory video). 
        Thread.sleep(30000); 

       }catch (InterruptedException interruptedException){ 

        // Stop the video if an interruption has been occurred. 
        video.stop(); 

       } 

       // Set the background image. 
       String filename = "./media/image/background.jpg"; 
       window.setContentPane(new JLabel(new ImageIcon(filename))); 

       // Show the window. 
       window.setVisible(true); 

       // Add the key listener to the window of the game. 
       window.addKeyListener(keyListener); 

       } 

      }); 

      // Start the execution of the thread. 
      thread.start(); 

      } 

     }); 

     } 

    }); 

    } 

    /** 
    * Creates a key listener. 
    * @return Key listener. 
    */ 
    public static KeyListener createKeyListener(){ 

    // Create the key listener. 
    KeyListener keyListener = new KeyListener(){ 

     // Set the behavior whenever a key is pressed. 
     @Override 
     public void keyPressed(KeyEvent keyEvent){ 

     // Check if the "Escape" key is pressed. 
     if (keyEvent.getKeyCode() == KeyEvent.VK_ESCAPE){ 

      // Check if the introductory video it is being played. 
      if (video.getStatus().equals(Status.PLAYING)){ 

      // Make an interruption in the thread that is being executed. 
      thread.interrupt(); 

      } 

     } 

     } 

     // Set the behavior whenever a key is released. 
     @Override 
     public void keyReleased(KeyEvent keyEvent){} 

     // Set the behavior whenever a key is typed. 
     @Override 
     public void keyTyped(KeyEvent keyEvent){} 

    }; 

    // Return the key listener. 
    return keyListener; 

    } 

    /** 
    * Shows the introductory video. 
    * @param panelJavaFX JFXPanel used to display the video. 
    */ 
    public static void showVideo(JFXPanel panelJavaFX){ 

    // Set the size of the JaxaFX panel as the resolution of the introductory video (1920 x 1080). 
    panelJavaFX.setSize(1920,1080); 

    // Set the location of the JavaFX panel as in the middle of the window of the game. 
    int coordinateX = (window.getWidth() - panelJavaFX.getWidth() - window.getInsets().left - window.getInsets().right)/2; 
    int coordinateY = (window.getHeight() - panelJavaFX.getHeight() - window.getInsets().top - window.getInsets().bottom)/2; 
    panelJavaFX.setLocation(coordinateX,coordinateY); 

    // Define the video file. 
    String filename = "./media/video/introduction.mp4"; 
    video = new MediaPlayer(new Media(new File(filename).toURI().toString())); 

    // Add the video to the JavaFX panel. 
    panelJavaFX.setScene(new Scene(new Group(new MediaView(video)))); 

    // Add the JavaFX panel to the window of the game. 
    window.getContentPane().setLayout(null); 
    window.add(panelJavaFX); 

    // Play the video. 
    video.setAutoPlay(true); 

    } 

} 

Answer 1

正確回答這個問題是：

我加了指令window.requestFocus()指令window.addKeyListener(keyListener)之前，現在它可以讀取「逃跑的時候「視頻播放後按下」鍵。