android - 在数据绑定(bind)上调用 setLifecycleOwner 时，我应该传递从 getViewLifecycleOwner 返回的 Fragment 实例还是所有者

Question

哪种方法是正确的:

1. 将 Fragment 实例作为 lifecycleOwner 传递:

   override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
       val binding = FragmentEventSettingsBinding.inflate(inflater, container, false)
       binding.lifecycleOwner = this
       return binding.root
   }
   

2. 传递 fragment 的viewLifecycleOwner:

   override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
       val binding = FragmentEventSettingsBinding.inflate(inflater, container, false)
       binding.lifecycleOwner = viewLifecycleOwner
       return binding.root
   }
   

Answer 1

推荐的解决方案是通过支持库 28.0.0 和 AndroidX 1.0.0 中添加的 getViewLifecycleOwner() 或 getViewLifecycleOwnerLiveData() 使用 fragment 的 View 生命周期，这样每次 fragment 的 View 被销毁时 LiveData 都会删除观察者

引用:5 common mistakes when using Architecture Components