Kotlin如何将JSONArray映射到Type(流) [英] Kotlin how to Map JSONArray to Type (Stream)

问题描述

我正在尝试将我的JSONArray映射到Array<String?>.

I'm trying to map my JSONArray to a Array<String?>.

我正在这样做:

fun getTextResponse(responseJson: JSONObject): Array<String?>{
        val resultData = responseJson.getJSONArray("data")
                .getJSONObject(0)
                .getJSONArray("result")

        return resultData.map{ it.getString("label") }.toTypedArray()
}

但是it的类型不是JSONObject，有什么办法可以强制将其键入JSONObject吗?

But it is not typed as a JSONObject, is there any way I can force type it to JSONObject ?

推荐答案

问题是resultData具有类型JSONArray，这是不覆盖Kotlin/Java Array接口的JSON实用程序类因此没有map函数.

The problem is that resultData has a type of JSONArray, which is a JSON utility class that doesn't overrides Kotlin/Java Array interface and thus doesn't have a map function.

您必须按索引检索每个字符串并生成新的数组，如下所示:

You have to retrieve each string by index and generate new array like this:

fun getTextResponse(responseJson: JSONObject): Array<String?> {
    val resultData = responseJson.getJSONArray("data")
            .getJSONObject(0)
            .getJSONArray("result")
    return Array<String?>(resultData.length()) { i -> resultData.getString(i) }
}

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