Java setPressedIcon not working

问题

I have menu in my application, and I want to set menu item normal state icon, and pressed state icon. Normal state icon is added, but when I press menu item, normal state icon is not changed by pressed state icon. What is problem here:

        JMenu m=new JMenu(text);
        m.setBackground(getTheme().colors.menuColor());
        m.setOpaque(false);
        m.setIcon(core.getIcon(text, "normal"));
        m.setPressedIcon(core.getIcon("webmaps", "pressed"));

回答1:

This issue has been seen before. The inherited setPressedIcon does not change the background Icon on the the JMenu (or indeed JMenuItem). You could use a MenuListener on the component as a workaround:

m.addMenuListener(new MenuListener() {

    @Override
    public void menuSelected(MenuEvent e) {
        JMenu menu = (JMenu) e.getSource();
        menu.setIcon(core.getIcon("webmaps", "pressed"));
    }

    @Override
    public void menuDeselected(MenuEvent e) {
        JMenu menu = (JMenu) e.getSource();
        menu.setIcon(core.getIcon(text, "normal"));
    }

    @Override
    public void menuCanceled(MenuEvent e) {
        JMenu menu = (JMenu) e.getSource();
        menu.setIcon(core.getIcon(text, "normal"));
    }
});

来源：https://stackoverflow.com/questions/15034573/java-setpressedicon-not-working