为什么我对 JSONObject 的键的第二次迭代没有运行？

我有一个JSONObject我正在用来创建一个表。但是，当我第二次使用这些键创建每个单元格时，它什么也没做。我添加了日志语句来测试这一点。不key打印单数 s。叫我难住了。

class MovieFragment : Fragment(), FinraDataInterface {

    private lateinit var binding: MovieFragmentBinding

    val finraDataInterface: FinraDataInterface = this

    override fun drawTable(jsonArrayData: JSONArray) {
//         ------ Draw the table -----
//         Draw the keys first
        val headerRow = TableRow(requireActivity())
        Log.d("jsonArray", jsonArrayData[0].toString())
        val firstRecord = jsonArrayData[0] as JSONObject
        val keys = firstRecord.keys()

        for (key in keys) {
            val textView = TextView(requireActivity())
            textView.text = key
            headerRow.addView(textView)
        }
        binding.table.addView(headerRow)

        // Draw the data second
        for (i in 0 until jsonArrayData.length()) {
            val record = jsonArrayData[i] as JSONObject
            Log.d("Record", record.toString())
            val tableRow = TableRow(requireActivity())
            Log.d("Table Row", "Table Row created")
            Log.d("Keys", listOf(keys).toString())

            // Error is right here.
            for (key in keys) {
                Log.d("key", key)
                val textView = TextView(requireActivity())
                val cellText = record[key] as String
                textView.text = cellText
                tableRow.addView(textView)
            }
            binding.table.addView(tableRow)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        binding = MovieFragmentBinding.inflate(layoutInflater)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        finraGetBondInfo("AMC")
    }




    private fun finraGetBondInfo(companyName: String) {
        val url = "https://www.finra.org/finra-data/fixed-income/corp-and-agency"

        val queue = Volley.newRequestQueue(requireActivity())
        var cfruid = ""

        val stringRequest = object: StringRequest(Request.Method.GET, url,
            { response ->
                Log.d("A", "Response is: " + response.substring(0,500))
            },
            { error ->
                Log.e("Error", error.toString())
            })
        {
            override fun  parseNetworkResponse(response : NetworkResponse) : Response<String> {
                // since we don't know which of the two underlying network vehicles
                // will Volley use, we have to handle and store session cookies manually
                Log.i("response", response.headers.toString());
                val cookies = HttpCookie.parse(response.headers?.get("Set-Cookie"))
                Log.d("Cookies:", cookies[0].toString())
                val indexOfEqualSign = cookies[0].toString().indexOf('=')
                cfruid = cookies[0].toString().substring(indexOfEqualSign + 1)
                Log.d("Cfruid:", cfruid)


                return super.parseNetworkResponse(response)
            }
        }

        queue.add(stringRequest)

        // Create our JSON Object for the finra call
        val json = JSONObject()
        val fieldsArray = JSONArray()
        fieldsArray.put("issueSymbolIdentifier")
        fieldsArray.put("issuerName")
        fieldsArray.put("isCallable")
        fieldsArray.put("productSubTypeCode")
        fieldsArray.put("couponRate")
        fieldsArray.put("maturityDate")
        fieldsArray.put("industryGroup")
        fieldsArray.put("moodysRating")
        fieldsArray.put("standardAndPoorsRating")
        fieldsArray.put("lastSalePrice")
        fieldsArray.put("lastSaleYield")
        json.put("fields", fieldsArray)

        json.put("dateRangeFilters", JSONArray())
        json.put("domainFilters", JSONArray())
        json.put("compareFilters", JSONArray())

        val multiJson = JSONObject()
        multiJson.put("fuzzy", false)
        multiJson.put("searchValue", companyName)
        multiJson.put("synonym", true)
        val subfieldsJson = JSONObject()
        subfieldsJson.put("name", "issuerName")
        subfieldsJson.put("boost", 1)
        val fieldsArray2 = JSONArray()
        fieldsArray2.put(subfieldsJson)
        multiJson.put("fields", fieldsArray2)
        val multiArray = JSONArray()
        multiArray.put(multiJson)

        json.put("multiFieldMatchFilters", multiArray)
        json.put("orFilters", JSONArray())
        json.put("aggregationFilter", JSONObject.NULL)
        val sortFieldsArray = JSONArray()
        sortFieldsArray.put("+issuerName")
        json.put("sortFields", sortFieldsArray)
        json.put("limit", 50)
        json.put("offset", 0)
        json.put("delimiter", JSONObject.NULL)
        json.put("quoteValues", false)

        Log.d("JSON", json.toString())


        val url2 = "https://services-dynarep.ddwa.finra.org/public/reporting/v2/data/group/FixedIncomeMarket/name/CorporateAndAgencySecurities"
        val request2 = object: JsonObjectRequest(Request.Method.POST, url2, json,
            { response ->
                // TODO replace this with our calls to make tab2 display bond data
                val returnBody =  response["returnBody"] as JSONObject
                var stringData = returnBody["data"] as String
                stringData = stringData.replace("\\n", "").replace("\\", "")
                val jsonArrayData = JSONArray(stringData)

                finraDataInterface.drawTable(jsonArrayData)
            },
            { error ->
                Log.e("Error", error.toString())
            })
        {
            override fun getHeaders(): MutableMap<String, String> {
                val headers = HashMap<String, String>()
                headers["Authority"] = "services-dynarep.ddwa.finra.org"
                headers["Accept"] = "application/json, text/plain, */*"
                headers["Cookie"] = "XSRF-TOKEN=$cfruid;"
                headers["Origin"] = "https://www.finra.org"
                headers["Referer"] = "https://www.finra.org/"
                headers["X-XSRF-token"] = cfruid
                headers["user-agent"] =  "python-requests/2.31.0"
                Log.d("headers:", headers.toString())
                return headers
            }

            override fun getBodyContentType(): String {
                return "application/json"
            }
        }
        queue.add(request2)

    }

}

让我特别困惑的是，使用键创建标题行的第一个 for 循环工作正常。我尝试将内容转换为不同的类型，看看是否存在某种类型错误。然而，这只是第二个 for 循环没有运行。我没有收到任何错误消息。我缺少什么？谢谢。