Type-safe and thread-safe, one-to-many event bus in Java, optimized for speed and low-garbage on Android.

Event classes can be posted to any object that is registered to receive that particular type. Any registered received can specify a preferred thread to execute the response on, and any number of receivers and objects may register for a given event type.

Available under the Apache 2.0 license.

Basic usage

public class Demo {
	class SomethingChanged {
		String content;
	public Demo () {
		// Create the EventBus
		EventBus eventBus = new EventBus();
		// Register subscribers
		eventBus.register(this, SomethingChanged.class, somethingChanged());
		// Post an event
		SomethingChanged event = new SomethingChanged();
		event.content = "Hello world!";
	private EventListener<SomethingChanged> somethingChanged () {
		return new EventListener<SomethingChanged>() {
			public void onEvent (SomethingChanged event) {
				System.out.println("content=" + event.content);

Multi-threaded usage (Android)

public class Model {
	public static EventBus eventBus = new EventBus();
	public class WorkComplete { }
	public void runTaskInBackground() {
		// Do some work on this background thread
		eventBus.post(new WorkComplete());

public class Demo extends Activity {
	public void onPause() {
	public void onResume() {
		eventBus.register(this, createThreadPreference(), WorkComplete.class, workComplete());
	private EventListener<WorkComplete> workComplete() {
		return new EventListener<WorkComplete>() {

			public void onEvent (WorkComplete event) {
				// This will execute on the UI thread
	private ThreadPreference createThreadPreference() {
		return new ThreadPreference(new ThreadExecutor() {

			public void post (final Object event, final EventListener<Object> listener) {
				// This is invoked on the event-source's thread
				runOnUiThread(new Runnable() { public void run() {
					// Invoke the listener ourselves, on the Activity's UI thread
Become a better Android Developer
Millions of developers are learning at MindOrks

Online Training Program

Featured Blogs

Our Team

MindOrks is Certainly one of the best online blog to stay on top of all the Android development news, coding and design patterns. Finally a blog I can count on to keep myself updated with latest and greatest things happening in Android world.

Vipul Shah
Android Developer

Become Pro in Android by watching videos