Because this method is running action twice

Question

I have a method where he performs another method depending on the button clicked. Only he seems to be running the methods called twice, and I do not know why. Can anyone help me and explain to me why this is? Follows the source

Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
        @Override
        public void eventDispatched(final AWTEvent event) {
            final KeyEvent evt = (KeyEvent) event;
            switch (evt.getKeyCode()) {
                case KeyEvent.VK_F1: { 
                    //F1
                    doSomething(); // this method is running twice

                    break;
                }
                case KeyEvent.VK_F2: {
                    //F2
                    doSomething();
                    break;
                }
                }, AWTEvent.KEY_EVENT_MASK);

Thanks

Answer 1

You are receiving an event for KEY_PRESSED and KEY_RELEASED.

You need to check if, in addition to the KeyEvent having the correct KeyCode you want to make sure it is the correct action, ie KEY_PRESSSED. One way to fix this is add a check for the action before you go into your switch statement.

Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
    @Override
    public void eventDispatched(final AWTEvent event) {
        if (event.getKeyChar() == KeyEvent.KEY_PRESSED)
        {
            final KeyEvent evt = (KeyEvent) event;
            switch(event.getKeyCode()){
                 //switch statement code
            }
        }   
    }, AWTEvent.KEY_EVENT_MASK);

Another thing you could do is create a KeyEventDispatcher and add it to the KeyboardFocusManager like this:

    //create KeyEventDispatcher myKeyEventDispatcher
    KeyboardFocusManager focusManager = KeyboardFocusManager.
            getCurrentKeyboardFocusManager(); 
    focusManager.addKeyEventDispatcher(myKeyEventDispatcher);

That way you will only get key event and you can dispatch them yourself

Answer 2

The problem appears to be that both the key-press and key-released methods are triggering the event. I would recommend using java.awt.event.KeyListener, which has separate event handlers for the press and release events.