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- 四种状态:运行状态(可见,有焦点)
暂停状态(可见,无焦点)
停止状态(不可见,无焦点)
销毁状态(删除或所在Activity结束)
- 11个生命周期方法:onAttach()
onCreate()
onCreateView()
onActivityCreated()
onStart()
onResume()
onPause()
onStop()
onDestroyView()
onDestroy()
onDetach()
- getFragmentManager beginTransaction replace/add/remove (popBackStack/addOnBackStack) commit