Lifecycle,LifecycleOwner,LiveData如何监听Activity生命周期?
Lifecycle是一个抽象类,里面有2个枚举类:1.Event,对应Activity生命周期的各个方法2.State,记录当前处于什么状态publicabstractclassLifecycle{@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)@NonNullAtomicReferencemInternalScopeRef=newAtomicReferenc