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1.Caused by: java.lang.IllegalStateException: Required view 'button' with ID 2131165211 for method 'clickBtn' was not found. If this view is optional add '@Nullable' (fields) or '@Optional' (methods) annotation.
绑定view的时候添加@Nullable注解。
绑定方法的时候使用@Optional注解。
2.Caused by: org.greenrobot.eventbus.EventBusException: Subscriber class com.example.mytestapp.eventbus.TestEventBusfirstActivity and its super classes have no public methods with the @Subscribe annotation
每个注册eventbus的地方都需要添加public订阅方法
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