问题描述
我正在尝试从 flow
收集事件。
视图模型
val events = MutableStateFlow<HomeEvent>(HomeEvent.Empty)
val uiEvents: StateFlow<HomeEvent> = events
private suspend fun emitEvent(homeEvent: HomeEvent) {
events.emit(homeEvent)
}
private fun downloadHomeData() {
viewmodelScope.launch(dispatchers.io + exceptionHandler) {
longRunningTaskSync()
emitEvent(HomeEvent.displayHomeAnimation())
longRunningTaskSync2()
emitEvent(HomeEvent.displayProgressiveLoadingImages())
longRunningTaskSync3()
emitEvent(HomeEvent.displayTitles())
emitEvent(HomeEvent.displayProgressiveLoadingPosts())
emitEvent(HomeEvent.displayProgressiveLoadingComments())
emitEvent(HomeEvent.displayKpi())
}
}
HomeFragment
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
lifecycleScope.launch {
repeatOnLifecycle(Lifecycle.State.STARTED) {
try {
viewmodel.uiEvents.collect { event ->
when (event) {
is HomeEvent.displayHomeAnimation -> { }
is HomeEvent.displayProgressiveLoadingImages -> { }
is HomeEvent.displayKpi -> { }
is HomeEvent.displayTitles -> { }
is HomeEvent.displayProgressiveLoadingPosts -> { }
is HomeEvent.displayProgressiveLoadingComments -> { }
is HomeEvent.Empty -> { }
}
}
} catch (t: Throwable) {
}
}
}
}
在上面的例子中,MutableStateFlow
未能发出一些事件。
但每次我在连续发射之间放置 delay(200)
时,一切正常。
除非我错了,否则它应该按发射顺序发射所有事件。这是预期的行为吗?我是否遗漏了文档中的某些内容?还是我做错了什么?
解决方法
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