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如果我可以将 Flow 和 StateFlow 与生命周期范围 \ viewLifecycleOwner.lifecycleScope 一起使用，那么在 ViewModel 中使用 LiveData 有什么意义

[英]What's the point of using LiveData in ViewModel if I can use Flow and StateFlow with lifecycleScope \ viewLifecycleOwner.lifecycleScope

原文 2020-07-22 20:37:43 5 1 android/ kotlin/ android-lifecycle/ kotlin-coroutines

Flow has a lot of operators, LiveData has only 3 (Transformations). Flow有很多算子， LiveData只有 3 个（Transformations）。 Is there any reason to keep using LiveData ~~except StateFlow is still experimental~~ ? ~~除了 StateFlow 仍处于试验~~ 阶段之外，还有什么理由继续使用 LiveData 吗？

UPD. UPD。 StateFlow, SharedFlow and corresponding operators are promoted to stable API in kotlinx.coroutines 1.4.0在 kotlinx.coroutines 1.4.0 中，StateFlow、SharedFlow 和相应的算子被提升为稳定的 API

1 个解决方案

There is not much reason to use LiveData nowadays.现在没有太多理由使用 LiveData。 (State)Flow/Coroutines also brings new possibilites via lifecycleScope.launchWhenCreated/Started/Resumed, hard to do with LiveData. (State)Flow/Coroutines 还通过lifecycleScope.launchWhenCreated/Started/Resumed 带来了新的可能性，LiveData 很难做到。

But there is one reason when LiveData is needed - DataBinding.但是需要 LiveData 有一个原因 - DataBinding。 It currently doesn't support observing Flow.它目前不支持观察 Flow。

EDIT: there is going to be support for StateFlow in DataBinding in Android Studio 4.3: https://twitter.com/manuelvicnt/status/1314621067831521282编辑：Android Studio 4.3 中的 DataBinding 将支持 StateFlow： https://twitter.com/manuelvicnt/status/1314621067831521282

使用 viewLifecycleOwner 的 lifecycleScope 从 Fragment 启动协程 - Launching a coroutine from a Fragment using viewLifecycleOwner's lifecycleScope

如何在 WebSocketListener 中使用暂停 function 或 viewModelScope/lifecycleScope？ - How can I use suspend function or viewModelScope/lifecycleScope in WebSocketListener?

使用 lifeCycleScope 后出现 IllegalStateException - IllegalStateException after using lifeCycleScope

使用 MainScope() 和 requireActivity().lifecycleScope 在片段内启动协程有什么区别？ - What's the difference between launching a coroutine inside a fragment using `MainScope()` and `requireActivity().lifecycleScope`?

lifecycleScope.launchWhenStarted 是否安全？如果不安全，在什么情况下？ - Is lifecycleScope.launchWhenStarted safe or not ? If it is not safe, for what case?

为什么片段的上下文在lifecycleScope中为空 - Why the fragment's context null inside lifecycleScope

为什么Android lifecycleScope可以自动取消 - Why Android lifecycleScope can be automatically cancelled

如何将WearableActivity与LiveData和ViewModel结合使用 - How can I use WearableActivity with LiveData and ViewModel

是否可以使用 Dagger 将当前 Activity 的 lifecycleScope 注入到非 Activity class 中？ - Can the lifecycleScope for the current Activity be injected into a non-Activity class using Dagger?

如何在 Jetpack Compose 的 viewModel 内将 DataStore 首选项的 Flow 转换为 StateFlow - How can I convert DataStore preferences' Flow to StateFlow inside a viewModel in Jetpack Compose

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