How to set the application icon for a libGDX desktop application?

Question

I am trying to setup an application icon from the -desktop specific class with:

package org.osgameseed.games.animalflip;

import com.badlogic.gdx.Files;
import com.badlogic.gdx.backends.lwjgl.LwjglApplication;
import com.badlogic.gdx.backends.lwjgl.LwjglApplicationConfiguration;

public class Main {
    public static void main(String[] args) {
        LwjglApplicationConfiguration cfg = new LwjglApplicationConfiguration();
        cfg.title = "AnimalFlip";
        cfg.useGL20 = false;
        cfg.width = 800;
        cfg.height = 600;
        cfg.addIcon("data/ic_launcher.png", Files.FileType.Internal);

        new LwjglApplication(new AnimalFlipGame(), cfg);
    }
}

The icon is not set (at least on Linux), any idea on how to set it ?

Answer 1

Take a look into the api (addIcon(...)):

. 。 Icons are tried in the order added, the first one that works is used. Typically three icons should be provided: 128x128 (for Mac), 32x32 (for Windows and Linux), and 16x16 (for Windows).

Maybe your icon has the wrong dimensions, so it won't get set. Else it should work!

Answer 2

that brought the Icon into my Mac-Dock! ;) Be sure to call it in your Lwjgl-Thread

/**
 * workaround for Mac
 */
private static void setApplicationIcon() {
    try {
        Class<?> cls = Class.forName("com.apple.eawt.Application");
        Object application = cls.newInstance().getClass().getMethod("getApplication").invoke(null);

        FileHandle icon = Gdx.files.local("icons/icon.png");
        application.getClass().getMethod("setDockIconImage", java.awt.Image.class)
                .invoke(application, new ImageIcon(icon.file().getAbsolutePath()).getImage());
    } catch (Exception e) {
        // nobody cares!
    }
}