greenrobot/EventBus

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EventBus是一个轻量级的发布/订阅事件总线，它简化了Android应用中组件间的通信，解耦发送者和接收者。适用于Activities、Fragments和后台线程，避免生命周期问题。快速、小巧且在大量安装的应用中得到验证，具备高级特性如交付线程、订阅者优先级等。

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EventBus…

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
Define events:

public static class MessageEvent { /* Additional fields if needed */ }
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:

@Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this);
}

@Override
public void onStop() {
super.onStop();
EventBus.getDefault().unregister(this);
}
Post events:

EventBus.getDefault().post(new MessageEvent());
Read the full getting started guide.

There are also some examples.

Note: we highly recommend the EventBus annotation processor with its subscriber index. This will avoid some reflection related problems seen in the wild.

Add EventBus to your project

Available on Maven Central.

Via Gradle:

implementation ‘org.greenrobot:eventbus:3.2.0’
Via Maven:

org.greenrobot eventbus 3.2.0 R8, ProGuard If your project uses R8 or ProGuard add the following rules:

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

And if you use AsyncExecutor:

-keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {
(java.lang.Throwable);
}
Homepage, Documentation, Links
For more details please check the EventBus website. Here are some direct links you may find useful:

Features

Documentation

Changelog

FAQ

How does EventBus compare to other solutions, like Otto from Square? Check this comparison.

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

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