在Flowable with RxJava中将Retrofit API响应与上载进程相结合

Question

tldr; 如何将API网络响应Single<ResponseReportObject>与Flowable<Double>发射器结合使用，以显示上传进度以及来自UI中API的网络响应。

我是RxJava的新手，目前，我已按照此示例显示我的Retrofit API调用的上传进度：https://medium.com/@PaulinaSadowska/display-progress-of-multipart-request-with-retrofit-and-rxjava-23a4a779e6ba所以现在，我正在尝试执行示例中的第一个侧注在上面的链接，但我不知道如何实现这一目标。

这是我在关注博文后所拥有的：

 fun sendReportWithAttachments(remoteReportObject: RemoteReportObject): Flowable<Double> {
    return Flowable.create({
        try {
            val fileParts = prepareFileParts(remoteReportObject.attachments, it)
            val reportPart = createPartFromReport(remoteReportObject)

            val response = reportEndpoint.postReportWithAttachments(reportPart, fileParts).blockingGet()
            it.onComplete()
        } catch (e: Exception) {
            it.tryOnError(e)
        }
    }, BackpressureStrategy.LATEST)
}

它会正确地将上传进程发送到UI，但它不会对API的响应做任何处理。所以为了结合我已经尝试过的结果：

fun sendReportWithAttachments(remoteReportObject: RemoteReportObject): Flowable<ResponseBodyWithProgress> {
var response: Single<ResponseReportObject>? = null
val progression: Flowable<Double> = Flowable.create({
    try {
        val fileParts = prepareFileParts(remoteReportObject.attachments, it)
        val reportPart = createPartFromReport(remoteReportObject)

        // network call and the parsed response
        response = reportEndpoint.postReportWithAttachments(reportPart, fileParts)

        it.onComplete()
    } catch (e: Exception) {
        it.tryOnError(e)
    }
}, BackpressureStrategy.LATEST)

// todo wrap the response with the progression in a wrapper Flowable object called ResponseBodyWithProgress
return Flowable.zip(response?.toFlowable(), progression,
        BiFunction<ResponseReportObject?, Double, ResponseBodyWithProgress> {
            responseReportObject: ResponseReportObject, progress: Double ->
            ResponseBodyWithProgress(responseReportObject, progress)
        })
}

但不幸的是，这不起作用。我相信我应该使用.zip运算符，但我不确定如何在这种情况下应用它。我希望有人能引导我朝着正确的方向前进。