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我在使我的KeyBoardFocusManger與我的全屏Window一起工作時出現問題。無論如何，它只是不會得到鍵盤輸入。我使用了System.exit(0)和println()來查找對按鍵/釋放/類型方法的任何調用，但不會引發錯誤。我試過KeyListeners;但是當我讀到this後，我改爲KeyboardFocusManager，同樣的事情仍然發生。我真的很絕望;從我可以判斷，Window沒有得到鍵盤的焦點？全屏窗口無法使用KeyListener或KeyBoardFocusManager獲取鍵盤輸入
這裏是我的主：
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
// Determine if full-screen mode is supported directly
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gs = ge.getDefaultScreenDevice();
if (gs.isFullScreenSupported()) {
Frame frame = new Frame(gs.getDefaultConfiguration());
SpaceInvaderUI spaceInvaderUI = new SpaceInvaderUI(frame);
// Enter full-screen mode
gs.setFullScreenWindow(spaceInvaderUI);
} else {
JOptionPane.showMessageDialog(null, "Does not support full screen!", "Error 0x01", JOptionPane.ERROR_MESSAGE);
System.exit(1);
}
}
});
}
這裏是包含KeyBoardFocusManger的UI，並在addListeners()方法添加：
class SpaceInvaderUI extends Window {
private JPanel drawingPanel;
private Image background;
private JButton btnExit;
public SpaceInvaderUI(Frame frame) {
super(frame);
try {
background = ImageIO.read(getClass().getResourceAsStream("background.png"));
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "Could not extract resource: " + ex.getMessage(), "Error 0x02", JOptionPane.ERROR_MESSAGE);
System.exit(2);
}
createWindow();
}
private void createComponents() throws HeadlessException {
drawingPanel = new DrawingPanel(background, this);
btnExit = new JButton("Exit");
}
private void createWindow() {
createComponents();
addListeners();
addComponentsToWindow();
}
private void addComponentsToWindow() {
add(drawingPanel, BorderLayout.CENTER);
add(btnExit, BorderLayout.SOUTH);
}
private void addListeners() {
KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
manager.addKeyEventDispatcher(new MyDispatcher());
btnExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
System.exit(0);
}
});
}
private class MyDispatcher implements KeyEventDispatcher {
@Override
public boolean dispatchKeyEvent(KeyEvent e) {
if (e.getID() == KeyEvent.KEY_PRESSED) {
System.out.println("pressed");
System.exit(0);
} else if (e.getID() == KeyEvent.KEY_RELEASED) {
System.out.println("released");
System.exit(0);
} else if (e.getID() == KeyEvent.KEY_TYPED) {
System.out.println("Typed");
System.exit(0);
}
return false;
}
}
}
的退出按鈕，只是因爲我厭倦了通過taskmanager殺死我的應用程序。最後，這裏是我的面板上該遊戲將採取地方，我的背景畫上：
public class DrawingPanel extends JPanel {
private final Image background;
private final SpaceInvaderUI invaderUI;
DrawingPanel(Image background, SpaceInvaderUI invaderUI) {
this.background = background;
this.invaderUI = invaderUI;
}
@Override
protected void paintComponent(Graphics grphcs) {
super.paintComponent(grphcs);
grphcs.drawImage(background.getScaledInstance((int) invaderUI.getWidth(), (int) invaderUI.getHeight(), Image.SCALE_SMOOTH), 0, 0, this);
}
}
預先感謝您。
編輯：我現在已經使用我drawingPanel一鍵綁定嘗試，但是當我按下F2 仍然什麼也沒有發生：
class SpaceInvaderUI extends Window {
private JPanel drawingPanel;
private Image background;
private JButton btnExit;
public SpaceInvaderUI(Frame frame) {
super(frame);
try {
background = ImageIO.read(getClass().getResourceAsStream("background.png"));
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "Could not extract resource: " + ex.getMessage(), "Error 0x02", JOptionPane.ERROR_MESSAGE);
System.exit(2);
}
createWindow();
}
private void createComponents() throws HeadlessException {
drawingPanel = new DrawingPanel(background, this);
btnExit = new JButton("Exit");
}
private void createWindow() {
createComponents();
addListeners();
addComponentsToWindow();
}
private void addComponentsToWindow() {
add(drawingPanel, BorderLayout.CENTER);
add(btnExit, BorderLayout.SOUTH);
}
private void addListeners() {
Action exit = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
};
drawingPanel.getInputMap().put(KeyStroke.getKeyStroke("F2"),
exit);
btnExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
System.exit(0);
}
});
}
}
它不是一個框架，但一個窗口，我可以用一個按鈕來關閉它，但我想在遊戲中使用的「ESC」鍵退出並彈出菜單等 –
然後我猜鍵聯結正是能爲工作您。 –