activity切换生命周期,recyclerview缓存机制

publicclasslifecycleactivityextendsappcompatactivity { @ overrideprotectedvoidoncreate (@ nullablebundlesavedinstancestanceste ) mylifecycleobservermylifecycleobserver=newmylifecycleobserver (； getLifecycle ().addobserver ) mylifecycleobserver； } @ overrideprotectedvoidondestroy () { super.onDestroy )； } publicclassmylifecycleobserverimplementslifecycleobserver { @ onlifecycleevent (life cycle.event.on _ create ) public } @ onlifecycleevent (life cycle.event.on _ destroy ) public void onDestroy ) ) log.e ) lifecycle_tag )，) onDestroy ) }上述方案也可以在fragment中使用