Blank icon on system tray

Question

I'm trying to add an icon to the system tray, however, when I run the application the icon is blank.

My project structure is like this:

root/
  libs/
    ...
  src/
    com/
      projname/
        logic/
          ...
        ui/
          MyClass.java
          ...
  res/
    icon.png

I'm trying to add the icon inside MyClass.java, like so:

private void addToSystemTray() throws AWTException {

    if (!SystemTray.isSupported()) {
        return;
    }

    // get the SystemTray instance
    SystemTray tray = SystemTray.getSystemTray();

    // load an image
    Image image = Toolkit.getDefaultToolkit().getImage(getClass().getClassLoader().getResource("icon.png"));

    // construct tray icon
    TrayIcon trayIcon = new TrayIcon(image, "My Project");

    // add the tray image
    tray.add(trayIcon);
}

I marked the res/ folder as Resources Root on IntelliJ, and I also built the .jar to check if the icon was being added to it - and it is.

What am I doing wrong?

Answer 1

Most probably your image is larger than the tray icon size and gets cropped. That's why you see the icon as blank. So you have to set, trayIcon.setImageAutoSize(true);

JavaDoc:

public void setImageAutoSize(boolean autosize)

Sets the auto-size property. Auto-size determines whether the tray image is automatically sized to fit the space allocated for the image on the tray. By default, the auto-size property is set to false.

If auto-size is false, and the image size doesn't match the tray icon space, the image is painted as-is inside that space — if larger than the allocated space, it will be cropped.

If auto-size is true, the image is stretched or shrunk to fit the tray icon space.