Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.
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Latest commit fd2c571 Aug 16, 2016 @greenrobot committed on GitHub Update


EventBus is a publish/subscribe event bus optimized for Android.


  • 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 (~50k jar)
  • is proven in practice by apps with 100,000,000+ installs
  • has advanced features like delivery threads, subscriber priorities, etc.

    Build Status

EventBus in 3 steps

  1. Define events:

    public class MessageEvent { /* Additional fields if needed */ }
  2. Prepare subscribers: Register your subscriber (in your onCreate or in a constructor):


    Declare your subscribing method:

    public void onEvent(AnyEventType event) {/* Do something */};
  3. Post events:;

This getting started guide shows these 3 steps in more detail.

Add EventBus to your project

Please ensure that you are using the latest version by checking here


compile 'org.greenrobot:eventbus:3.0.0'



Or download EventBus from Maven Central

Homepage, Documentation, Links

For more details on EventBus please check 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.


Copyright (C) 2012-2016 Markus Junginger, greenrobot (

EventBus binaries and source code can be used according to the Apache License, Version 2.0.

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