Question

拥有下一个数据模型：

data class Response(
        private val success: Boolean, 
        private val error: Error, 
        private val data: Data
)

我希望success == false或数据对象错误对象success == true我Observable流中的Observable.just(Response(true, Error(), Data())) .filter { response -> response.success } .switchIfEmpty { } //Wanted response.error here .subscribe { response-> } //Wanted response.data here instead of full response.。

我尝试了以下方法：

<StackLayout Grid.Column="2" Orientation="Vertical" VerticalOptions="Center" WidthRequest="132">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Tapped="shelfOption_Tapped"/>
</StackLayout.GestureRecognizers>
</StackLayout>

有人知道如何实现这个目标吗？

Answer 1

在这种情况下你应该使用密封类

sealed class Response {
    data class Success(val data: Data) : Response()
    data class Error(val error: Error) : Response()
}

并进入你的rx observable：

   ... //observableChain
   .subscribe { result: Response -> 
        when (result) {
            is Success -> handleSuccess(result.data)
            is Error -> handleError(result.error)
        }
   }

Answer 2

我使用flatMap代替filter实现了我的目标，这使我能够实现if-else流程：

Observable.just(Response(true, Error(), Data()))
        .flatMap { response ->
            if(response.success) Observable.just(response.error)
            else Observable.just(response.data)
        }
        .subscribe { result->
            when(result) {
                is Data -> //handle data
                is Error -> //handle error
            }
        }

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2 个答案: