消費者在Kotlin中找不到

Question

我想將此Java示例轉換為kotlin。

但...

{responseBody-> .....}類型不匹配。

fun handleAudioMessageEvent(event: MessageEvent<AudioMessageContent>) {
    handleHeavyContent(
        event.replyToken,
        event.message.id
    ) { responseBody ->
        val provider = event.message.contentProvider
        val mp4: DownloadedContent
        if (provider.isExternal) {
            mp4 = DownloadedContent(null, provider.originalContentUrl)
        } else {
            mp4 = saveContent("mp4", responseBody)
        }
        reply(event.replyToken, AudioMessage(mp4.uri, 100))
    }
}
.
.
.
private fun handleHeavyContent(
    replyToken: String, messageId: String,
    messageConsumer: Consumer<MessageContentResponse>
) {
    val response: MessageContentResponse
    try {
        response = lineMessagingClient?.getMessageContent(messageId)
            ?.get()!!
    } catch (e: InterruptedException) {
        reply(replyToken, TextMessage("Cannot get image: " + e.message))
        throw RuntimeException(e)
    } catch (e: ExecutionException) {
        reply(replyToken, TextMessage("Cannot get image: " + e.message))
        throw RuntimeException(e)
    }

    messageConsumer.accept(response)
}

類型不匹配。

必需：消費者

找到：（???）->單位

Answer 1

如果您將handleHeavyContent的聲明更改為此，我猜它會起作用：

private fun handleHeavyContent(
    replyToken: String, messageId: String,
    messageConsumer: (MessageContentResponse) -> Unit
)