MainActivity.java

public class MainActivity extends Activity {

     private EventBus bus = EventBus.getDefault();

     private TextView view;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        view = (TextView) findViewById(R.id.text);
        // Registrar o eventbus
        bus.register(this);
     }

    @Override
    protected void onDestroy() {
      // Destruir o registro
      bus.unregister(this);
      super.onDestroy();
    }
    
    //Método que atualiza o TextView de acordo com o evento obtido
    public void onEvent(Evento evento){
      view.setText(evento.getAlerta());
    }
}