Java - using thread with GUI

Question

I'm having an issue with my GUI when I try to change the color of a button after 2 seconds when its has been clicked. What I want to do is to click on a white square button, then a color comes up, after 2 seconds I want it to return to it's original color (white). How can achieve this?

My code on click:

cards[index].setBackground(cards[index].getTrueColor());
try
{
    Thread.sleep(2000);
    cards[cardPos.get(0)].setBackground(Color.white);
}
catch(Exception e) {}

So this goes back to color white, but in an instance, doesn't wait to seconds. Really appreciate a little help here. Thanks!

You need to say what GUI framework you are using. Is it Swing (Desktop), Android (Mobile Phones) or GWT (Web sites)? — Jonas
– Jonas, Commented Aug 13, 2011 at 11:01

Nate W. · Accepted Answer · 2011-08-13 11:10:11Z

3

This calls for a Timer instead of Thread.sleep. You'll want to set the timer with a delay of 2 seconds, and then have it reset the color of your button. For example, in Swing:

// onButtonClick
final Card card = cards[index];
card.setBackground(card.getTrueColor());
new Timer(2000, new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        // Change color back
        card.setBackground(Color.WHITE);
    } 
}).start();

How to Use Swing Timers

edited Aug 13, 2011 at 11:10

answered Aug 13, 2011 at 10:56

Nate W.

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Comments

Rakhita Wickramatunge · Accepted Answer · 2011-08-13 10:48:01Z

1

You can use the AsynkTask class in Android. You can use the onPreExecute method to execute the initial task, and then you can wait and change the button color after 2 sec, this can be done in doInBackground method and you can publish the results to UI by calling publish progress method, and finally you can use the onPostExecute method.

http://developer.android.com/reference/android/os/AsyncTask.html

answered Aug 13, 2011 at 10:48

Rakhita Wickramatunge

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