dependencies {

  //最新版本
  compile 'org.greenrobot:eventbus:3.0.0' 

  //可以翻倍提高EventBus使用效率
  provided 'de.greenrobot:eventbus-annotation-processor:3.0.0-beta1'

}

/**
 * Activity基类
 */
protected EventBus eb;

 @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //单例模式获取到实例并注册
    eb = EventBus.getDefault();
    eb.register(this);

  }


 @Override
  protected void onDestroy() {
    //反注册
    eb.unregister(this);
    super.onDestroy();
  }


 //主线程
 @Subscribe(threadMode = ThreadMode.MAIN)
 public void onMainEvent(EventBean event) {
 }

 //主线程 粘性(比如传递intent使用)
 @Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
 public void onMainStickEvent(EventBean event) {
 }

 //后台
 @Subscribe(threadMode = ThreadMode.BACKGROUND)
 public void onBackgroundEvent(EventBean event) {
 }

 //重新开启一个线程来执行
 @Subscribe(threadMode = ThreadMode.ASYNC)
 public void onAsyncEvent(EventBean event) {
 }

//根据不同需求自定义
/**
 * 自定义Event消息
 */
public class EventBean {

  public int id;//类型标识

  public Object data;//数据对象

  //省略constructor & getter & setter
}

继承自基类Activity后：

eb.post(new EventBean(1, "data"));

//粘性
eb.postSticky(new EventBean(1, "data"));