How do I show a notification in IntelliJ?

Question

Figured out how to show one of those little notification bubble messages in the top right of the screen, answer below.

Answer 1

Turns out, you have to make a NotificationGroup instance, and then use that to make a Notification, and pass the notification and the Project to Notifications.Bus.notify().

public class VoiceApplicationComponentImpl implements ApplicationComponent, VoiceApplicationComponent {
    ...
    public static final NotificationGroup GROUP_DISPLAY_ID_INFO =
        new NotificationGroup("My notification group",
            NotificationDisplayType.BALLOON, true);
    ...
    void showMyMessage(String message) {
        ApplicationManager.getApplication().invokeLater(new Runnable() {
            @Override
            public void run() {
                Notification notification = GROUP_DISPLAY_ID_INFO.createNotification(message, NotificationType.ERROR);
                Project[] projects = ProjectManager.getInstance().getOpenProjects();
                Notifications.Bus.notify(notification, projects[0]);
            }
        });
    }

Note: you'll probably have a better way to get the current Project, right now I just assume there's one open project. This means my method doesn't work on startup (projects array is empty).

Another note: you'll probably not need to wrap with the invokeLater but I did, because I was calling showMyMessage in a different thread.