1:基本概念

1. 对于自己自定义的一些组件，想要它们在fragment或activity中随fragment或acitivity同生同死，避免手动在onCreate或onDestroy里创建和销毁，可以令自己的组件继承LifecycleObserver接口, 然后在fragment或activity中addObserver(LifecycleObserver)。
2. LifecycleObserver没有具体要实现的方法，只需要在自己实现的继承lifecycleObserver的类中的方法上加上注释，例如

   @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)//绑定fragment的创建时刻
   
   @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)//绑定fragment的销毁时刻

   其他可参考：

   public enum Event {
           /**
            * Constant for onCreate event of the {@link LifecycleOwner}.
            */
           ON_CREATE,
           /**
            * Constant for onStart event of the {@link LifecycleOwner}.
            */
           ON_START,
           /**
            * Constant for onResume event of the {@link LifecycleOwner}.
            */
           ON_RESUME,
           /**
            * Constant for onPause event of the {@link LifecycleOwner}.
            */
           ON_PAUSE,
           /**
            * Constant for onStop event of the {@link LifecycleOwner}.
            */
           ON_STOP,
           /**
            * Constant for onDestroy event of the {@link LifecycleOwner}.
            */
           ON_DESTROY,
           /**
            * An {@link Event Event} constant that can be used to match all events.
            */
           ON_ANY;

    

2：

jetpack-lifecycle