Fullscreen java app minimizes when screensaver turns on

Question

I have an app that sets a fullscreen frame but seems to minimize when the screensaver turns on. I want this app to be the only application that the users of the touchscreen kiosks can use so this is a problem. Is there anyway to prevent this?

These machines are left on 24/7 and we'd prefer to not lose lifetime on 600$ touchscreens. — davidahines, May 31 '11 at 19:52
This may be what you are looking for: http://stackoverflow.com/a/28375740/1686442 — Scott Wardlaw, Feb 06 '15 at 22:18

score 3 · Answer 1 · answered May 30 '11 at 15:33

The internet says that the cross-platform way to achieve this is to schedule keyboard events with this code:

import java.awt.Robot;
public void disableScreenSaver() throws AWTException {
  Robot r = new Robot();
  r.waitForIdle();
  r.keyPress(KeyEvent.VK_CONTROL);
  r.keyRelease(KeyEvent.VK_CONTROL);
}

and to schedule it to run every couple of minutes (e.g. with thread.sleep();). This way the screen-saver will not show up.

I have no idea, though, about a non-hackish, cross-platform solution, and I would be very happy to see one from someone who knows it :)

Don't use `thread.sleep();` in one thread in a loop for this. Use a `ScheduledExecutorService` instead. — Simon Forsberg, Mar 11 '14 at 08:34

score 1 · Answer 2 · edited May 23 '17 at 12:12

1

Probably (haven't tried it !) you'll get your answer by combining the answers to these questions:

Calling Win32 API method from Java

Need to disable the screen saver / screen locking in Windows C#/.Net

Of course this works only in Windows that's why I asked you about your OS :)

edited May 23 '17 at 12:12

Community

1
1

answered May 30 '11 at 15:52

Serafeim

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score 1 · Accepted Answer · answered May 30 '11 at 16:03

1

Another way is to add a window listener and reset state when it's deactivated:

        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowDeactivated(WindowEvent e) {
                frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
                // or go to fullscreen mode here
            }
        });

But disabling screensaver might be the best thing to start with.

answered May 30 '11 at 16:03

Denis Tulskiy

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This is more the avenue I was looking for. – davidahines May 31 '11 at 19:51

Fullscreen java app minimizes when screensaver turns on

3 Answers3