EventBus3.1.1 解决 Caused by: org.greenrobot.eventbus.EventBusException: Subscriber class ... and its ...

      小菜今天自己写测试 Demo 时，需要用到 EventBus，目前集成 3.1.1 版本，集成的方式很简单，在某个 Fragment 实践应用中，却一直报入下错：
Caused by: org.greenrobot.eventbus.EventBusException: Subscriber class com.roating.ace.frag.FragmentSign and its super classes have no public methods with the @Subscribe annotation

      出问题就解决嘛，尝试如下：

1. 检查 EventBus 集成是否添加混淆文件：

-keepattributes *Annotation*
-keepclassmembers class ** {
    @org.greenrobot.eventbus.Subscribe <methods>;
}
-keep enum org.greenrobot.eventbus.ThreadMode { *; }
 
# Only required if you use AsyncExecutor
-keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {
    <init>(java.lang.Throwable);
}