CODEWITHSUNDEEP
javaswingmavenjnlpsplash-screen
Krystek
Krystek

Reputation: 31

Java SplashScreen in Java Web Start

I am trying to move my Java Swing project to Java Web Start and I have problem with the splash screen. This application uses Maven.

When I load my application via the command-line or by an external exe, it displays the splash screen correctly.

final SplashScreen splash = SplashScreen.getSplashScreen();

When I run application via Java Web Start, it always return null.

Yes, I know about splash screen section in JNLP file.

<icon kind="splash" href="splash.png"/>

But this will show splash screen before the application is loaded and not when the application is running. In other words, it isn't a replacement for the --splash switch.

In the manifest file, I have:

   SplashScreen-Image: (URL to resource,  file in jar)

This works well only when I run jar file and not in Java Web Start.

Has anybody had this same problem and found any solution for this? I need a splash screen because the application takes several seconds to start and nothing is displayed for user in this time.

Upvotes: 3

Views: 1461

Answers (3)

mikemil
mikemil

Reputation: 1241

To show a splash screen for JNLP clients, call the start() method passing the splash image path. To remove the splash screen, call the stop() method.

public class ShowSplash 
{
   private static JWindow splashFrame;

   public void start(String splashImagePath) throws Exception
   {
      JLabel label;
      ImageIcon image;
      URL url;

      splashFrame = new JWindow();
      url         = ShowSplash.class.getResource(splashImagePath);
      image       = new ImageIcon(url);
      label       = new JLabel(image);

      splashFrame.add(label, BorderLayout.CENTER);
      splashFrame.pack();
      splashFrame.setLocationRelativeTo(null);
      splashFrame.setVisible(true);
   }

   public void stop() throws Exception
   {
      splashFrame.dispose();

      splashFrame = null;
   }
}

Upvotes: 2

Krystek
Krystek

Reputation: 31

Thanks for answers, but I have problem with replace SplashRenderer with JWindow.

Here is code:

    splashFrame = new JWindow();

    splashFrame.setBackground(Color.white);

    JPanel splashPanel = new JPanel();

    splashPanel.setLayout(new BorderLayout());

    JLabel image = new JLabel(img);

    splashPanel.add(image); 

    splashFrame.setContentPane(splashPanel);
    splashFrame.pack();
    splashFrame.setLocationRelativeTo(null);
    splashFrame.setAlwaysOnTop(true);
    splashPanel.paintImmediately(0, 0, splashPanel.getSize().width, splashPanel.getSize().height);
    splashFrame.setSize(splashPanel.getSize().width,splashPanel.getSize().height);
    splashFrame.setLocation(100, 100);
    splashFrame.setVisible(true);

The Window is always in back, no metter if I set setAlwyasOnTop or if I set this methods in background thread. SplashRender in this case always stays on top, but JWindow not.

Currently effect is - When I start APP the Window is not visible during start up, but it's shows when MainFrame appear.

Upvotes: 0

Andrew Thompson
Andrew Thompson

Reputation: 168825

The JWS based splash screen uses totally different functionality (and a different loading philosophy) to the AWT based SplashScreen. The JWS splash is always a loose file that is referenced in the JNLP file. We cannot get access to draw on the JNLP splash.

Upvotes: 1

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