Keylistener does not work after clicking a button

Question

I have a keylistener attached to my frame in java, I can detect keystrokes when I press any key, however a strange thing happens. My game is a minesweeper, I have a restart button that basically clears the board and overwrites it. Strange, when I press the button with the mouse, everything clears up fine, and the board remains in memory, but the keylistener stops working. Even a stranger, I have a jmenuitem that basically does an automatic button click. So this is like restartbutton.doclick ()

if I click on jmenuitem to restart it, reboots, clears everything, and the keylistener function still functions. I can even see that a button is pressed. Any ideas why this could be happening?

thanks

this is attached to my main frame. This is a listener that stops working after clicking a button.

frame.addKeyListener(new KeyListener(){ public void keyReleased(KeyEvent e){ } public void keyPressed(KeyEvent e){ System.out.println("hey"); int keycode = e.getKeyCode(); if(e.isControlDown() & keycode==KeyEvent.VK_C){ balh blah balh } } public void keyTyped(KeyEvent e){ } }); 

Answer 1

Suggestions:

• Your focus problem is when the KeyListener stops working because the container it is listening to has lost focus on JButton.
• One solution is to prevent JButton from getting focus by calling setFocusable(false) on it.
• But I recommend that you do not use KeyListener at all, if possible, but rather key bindings, since you do not have this problem with bindings, and is also a higher-level construct.

Edit
Regarding

what would be the best way to change this to key binding?

It’s best to go through the keyword tutorial and follow the recommendations found there.

Answer 2

This is a focus problem, you can use this code to give focus again

getTopLevelAncestor().requestFocus();

Answer 3

Based on the answer to this similar question , I applied KeyEventDispatcher instead of using default listeners. I believe that this feature will be quite global, so you may need to check and make sure that the right things are visible / focused.

  KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher( new KeyEventDispatcher() { public boolean dispatchKeyEvent(KeyEvent e) { if (e.getID() == KeyEvent.KEY_PRESSED) { System.out.println("tester"); } return false; } 

Answer 4

I managed to solve this problem by setting the container container true for the setFocused property:

 frame.setFocusable(true);