json - Kotlin klaxon 解析谷歌方向 Api

Question

对不起我的英语（谷歌翻译）。我试图在 Kotlin上使用 klaxon （ https://github.com/cbeust/klaxon ）从答案谷歌方向得到两点之间的距离。

 fun distanceDier (start: LatLng, end: LatLng, mode: String) {
    val url = ("http://maps.googleapis.com/maps/api/directions/json?"
            + "origin=" + start.latitude + "," + start.longitude
            + "&destination=" + end.latitude + "," + end.longitude
            + "&sensor=false&units=metric&mode=" + mode)
    val result = URL("$url").readText()
    val parser: Parser = Parser()
    val stringBuilder: StringBuilder = StringBuilder(result)
    val json: JsonObject = parser.parse(stringBuilder) as JsonObject
    println("distance : ${json.string("routes.legs.distance.text")},")
    println("$url") //test

设定点

 distanceDier(LatLng(53.402971, 91.083748),LatLng(53.529799, 91.410684),"TravelMode")

日志：

FATAL EXCEPTION: main
                                                      Process: ru.kbais.coal4, PID: 4494
                                                      java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity {ru.kbais.coal4/ru.kbais.coal4.MainActivity}: android.os.NetworkOnMainThreadException

放置错误

val result = URL("$url").readText()

网址： http ://maps.googleapis.com/maps/api/directions/json?origin=53.402971,91.083748&destination=53.529799,91.410684&sensor=false&units=metric&mode=TravelMode

如何从 Json 文件中获取距离以及错误代码是什么？

Answer 1

 fun distanceDier (start: LatLng, end: LatLng, mode: String) {
val url = ("http://maps.googleapis.com/maps/api/directions/json?"
        + "origin=" + start.latitude + "," + start.longitude
        + "&destination=" + end.latitude + "," + end.longitude
        + "&sensor=false&units=metric&mode=" + mode)
//val result = URL(url).readText()
//an extension over string (support GET, PUT, POST, DELETE with httpGet(), httpPut(), httpPost(), httpDelete())
url.httpGet().responseString { request, response, result ->
    //do something with response
    when (result) {
        is Result.Failure -> {

        }
        is Result.Success -> {
            val res = result.value
            println("Result: $result")
            val parser: Parser = Parser()
            val stringBuilder: StringBuilder = StringBuilder(res)
            val json: JsonObject = parser.parse(stringBuilder) as JsonObject
            println("distance : ${json.lookup<String?>("routes.legs.distance.text")},")

        }
    }
}
}