How use system default icons pack in Java Swing?-CodePudding

I want use the default icons of my OS (kali linux gnome) in my Java application. I don't know if need to import the entire icons pack or if i just use some java swing method. Can you explain to me how to proceed?

CodePudding user response：

The simplest approach is to just use an icon file directly:

Icon icon = new ImageIcon("/usr/share/icons/Adwaita/32x32/actions/document-open.png");

But really, icons are more complicated than that. There is a whole specification for how icon themes work. It includes a moderately complex algorithm for matching a desired icon by type and size.

Java SE has no way to read SVG images that I know of, so either you would need to locate a robust, stable SVG library for Java, or you would need to ignore a theme’s scalable directories.

The only way I know to obtain the end user’s current icon theme is with a command like:

ProcessBuilder builder = new ProcessBuilder(
    "gsettings", "get", "org.gnome.desktop.interface", "icon-theme");
builder.redirectError(ProcessBuilder.Redirect.INHERIT);

String themeName;
Process iconThemeCommand = builder.start();
try (InputStream commandOutput = iconThemeCommand.getInputStream()) {
    themeName = new String(commandOutput.readAllBytes()).trim();
}
iconThemeCommand.waitFor();

There is also the problem of being multi-platform. Obviously Windows and OSX won’t have a /usr/share/icons/Adwaita directory. You can bundle an icon theme tree with your application, but it’s probably under GPL or a similar license, so you would have to release your software under that license (or never release it at all) and include a copy of that license with your program, along with a notice to users where to obtain your program’s source.

CodePudding user response：

Not completely sure if this is what you are asking but these will set the look and feel OS specific:

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());