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Thread: KeyListener is not working

  1. #1
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    Post KeyListener is not working

    I'm programming a game, but the keyListener doesn't work. Here is the source code:

    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
     
    public class InputHandler implements KeyListener{
     
    	public InputHandler(Game game) {
    		game.addKeyListener(this);
    	}
     
    	public class Key {
     
    		private boolean pressed = false;
     
    		public boolean isPressed() {
    			return pressed;
    		}
     
    		public void toggle(boolean isPressed) {
    			pressed = isPressed;
     
    		}
    	}
     
     
    	public Key up = new Key();
    	public Key down = new Key();
    	public Key left = new Key();
    	public Key right = new Key();
     
    	public void keyPressed(KeyEvent e) {
    		toggleKey(e.getKeyCode(),true);
    	}
     
    	public void keyReleased(KeyEvent e) {
    		toggleKey(e.getKeyCode(),false);
    	}
     
    	public void keyTyped(KeyEvent e) {
     
    	}
     
    	public void toggleKey(int keyCode, boolean isPressed) {
    		if(keyCode == KeyEvent.VK_W){
    			up.toggle(isPressed);
    			}
    		if(keyCode == KeyEvent.VK_S){
    			down.toggle(isPressed);
    			}
    		if(keyCode == KeyEvent.VK_A){
    			left.toggle(isPressed);
    			}
    		if(keyCode == KeyEvent.VK_D){
    			right.toggle(isPressed);
    			}
    	}
     
     
    }

    and in class Game:
    ...
    public InputHandler input = new InputHandler(this);
    ...
    //in a method, that gets called every gametick:
    if(input.up.isPressed()==true){
    	System.out.println("up"); //This doesn't work!
    }

    My Question is: Why will it not say "up", if I press "w" ? Thanks in advance for every aswer
    Last edited by Micha S.; June 1st, 2014 at 06:38 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: KeyListener is not working

    Are the listener methods called? The component needs the focus to receive key events.

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE GOES HERE
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    Micha S. (June 1st, 2014)

  4. #3
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    Default Re: KeyListener is not working

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    Please post your code correctly per the above link and Norm's instructions.

  5. #4
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    Default Re: KeyListener is not working

    They don't get called, I just noticed that. ^^
    How do I set the focus? I have already tried "frame.requestFocus();" in the constructor of Game.. but actually, I have no Idea what that should do
    I never did something like that

    --- Update ---

    Okay, I tried it again and somehow it works and I have no idea, why it's working now ^^ (added frame.requestFocus(); to the Game class) Thank you, Norm, for helping and I hope my code is posted appropriately now

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