How to send event from Service to Activity with Otto event bus?

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To post from any thread (main or background) and receive on the main thread, try something like

public class MainThreadBus extends Bus {
  private final Handler mHandler = new Handler(Looper.getMainLooper());

  @Override
  public void post(final Object event) {
    if (Looper.myLooper() == Looper.getMainLooper()) {
      super.post(event);
    } else {
      mHandler.post(new Runnable() {
        @Override
        public void run() {
          MainThreadBus.super.post(event);
        }
      });
    }
  }
}

Note: credit goes to Jake Wharton and “pommedeterresaute” at https://github.com/square/otto/issues/38 for the general approach. I just implemented it with a wrapper class rather than a subclass.

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