Code Quality Rank: L4
Programming language: Java
License: Apache License 2.0
Tags: Messaging     Projects    
Latest version: v3.2.0

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EventBus is a publish/subscribe event bus for Android and Java.

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  • simplifies the communication between components
    • decouples event senders and receivers
    • performs well with Activities, Fragments, and background threads
    • avoids complex and error-prone dependencies and life cycle issues
  • makes your code simpler
  • is fast
  • is tiny (~60k jar)
  • is proven in practice by apps with 1,000,000,000+ installs
  • has advanced features like delivery threads, subscriber priorities, etc.

EventBus in 3 steps

  1. Define events:

    public static class MessageEvent { /* Additional fields if needed */ }
  2. Prepare subscribers: Declare and annotate your subscribing method, optionally specify a thread mode:

    @Subscribe(threadMode = ThreadMode.MAIN)  
    public void onMessageEvent(MessageEvent event) {/* Do something */};

    Register and unregister your subscriber. For example on Android, activities and fragments should usually register according to their life cycle:

    public void onStart() {

    public void onStop() {

3. Post events:

    EventBus.getDefault().post(new MessageEvent());

Read the full [getting started guide](https://greenrobot.org/eventbus/documentation/how-to-get-started/).

There are also some [examples](https://github.com/greenrobot-team/greenrobot-examples).

**Note:** we highly recommend the [EventBus annotation processor with its subscriber index](https://greenrobot.org/eventbus/documentation/subscriber-index/).
This will avoid some reflection related problems seen in the wild.  

Add EventBus to your project
<a href="https://search.maven.org/search?q=g:org.greenrobot%20AND%20a:eventbus"><img src="https://img.shields.io/maven-central/v/org.greenrobot/eventbus.svg"></a>

Available on <a href="https://search.maven.org/search?q=g:org.greenrobot%20AND%20a:eventbus">Maven Central</a>.

Via Gradle:
implementation 'org.greenrobot:eventbus:3.2.0'

Via Maven:


R8, ProGuard

If your project uses R8 or ProGuard add the following rules:

-keepattributes *Annotation*
-keepclassmembers class * {
    @org.greenrobot.eventbus.Subscribe <methods>;
-keep enum org.greenrobot.eventbus.ThreadMode { *; }

# And if you use AsyncExecutor:
-keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {

Homepage, Documentation, Links

For more details please check the EventBus website. Here are some direct links you may find useful:





How does EventBus compare to other solutions, like Otto from Square? Check this [comparison](COMPARISON.md).


Copyright (C) 2012-2020 Markus Junginger, greenrobot (https://greenrobot.org)

EventBus binaries and source code can be used according to the [Apache License, Version 2.0](LICENSE).

Other projects by greenrobot

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Essentials is a set of utility classes and hash functions for Android & Java projects.

greenDAO is an ORM optimized for Android: it maps database tables to Java objects and uses code generation for optimal speed.

*Note that all licence references and agreements mentioned in the EventBus README section above are relevant to that project's source code only.