Question

我有一个使用for循环填充的列表。我在具有此块的方法中运行此代码。我需要有关如何返回myReportLocations及其值的帮助

private fun getReportCoordinates(): ArrayList<HashMap<String, String>>{
        var reportLocations : ArrayList<HashMap<String, String>> = ArrayList()
        var myReportLocations : ArrayList<HashMap<String, String>> = ArrayList()

        Fuel.get("http://kite.pythonanywhere.com/api/v1/progress").header(Headers.COOKIE, cookie).responseJson { request: Request, response: Response, result: Result<FuelJson, FuelError> ->
            //incident_count = (count_occurrences('{', response.body().toString()) - 1).toString()
            for (i in 0..result.get().array().length() -1){
                //myReportLat = result.get().array().getJSONObject(i)["latitude"].toString()
                //myReportLong= result.get().array().getJSONObject(i)["longitude"].toString()
                var reportCoord: HashMap<String, String> = HashMap()

                //println("The coordinates are: " + myReportLat+ " : " + myReportLong)
                reportCoord.put("LocationID", i.toString())
                reportCoord.put("Latitude", result.get().array().getJSONObject(i)["latitude"].toString())
                reportCoord.put("Longitude", result.get().array().getJSONObject(i)["longitude"].toString())
                reportCoord.put("LocationName", "Progress Report")
                reportLocations.add(reportCoord)
            }

            /*for (x in 0..reportLocations.size -1){
                println("This is the " + x + "th coordinate " + reportLocations.get(x))
            }*/

            myReportLocations.addAll(reportLocations)//everything is stored here
        }
        myReportLocations//there nothing stored
        return myReportLocations
    }

Answer 1

以下是您的解决方案：

private fun getReportCoordinates(result: (list:ArrayList<HashMap<String, String>> -> Unit) {
    var reportLocations : ArrayList<HashMap<String, String>> = ArrayList()
    var myReportLocations : ArrayList<HashMap<String, String>> = ArrayList()

    Fuel.get("http://kite.pythonanywhere.com/api/v1/progress").header(Headers.COOKIE, cookie).responseJson { request: Request, response: Response, result: Result<FuelJson, FuelError> ->
        //incident_count = (count_occurrences('{', response.body().toString()) - 1).toString()
        for (i in 0..result.get().array().length() -1){
            //myReportLat = result.get().array().getJSONObject(i)["latitude"].toString()
            //myReportLong= result.get().array().getJSONObject(i)["longitude"].toString()
            var reportCoord: HashMap<String, String> = HashMap()

            //println("The coordinates are: " + myReportLat+ " : " + myReportLong)
            reportCoord.put("LocationID", i.toString())
            reportCoord.put("Latitude", result.get().array().getJSONObject(i)["latitude"].toString())
            reportCoord.put("Longitude", result.get().array().getJSONObject(i)["longitude"].toString())
            reportCoord.put("LocationName", "Progress Report")
            reportLocations.add(reportCoord)
        }

        /*for (x in 0..reportLocations.size -1){
            println("This is the " + x + "th coordinate " + reportLocations.get(x))
        }*/

         result(myReportLocations)
    }
}

Answer 2

这是一个异步调用。因此，列表将在返回后进行更新。您要做的就是将其转换为阻塞的网络呼叫。（尽管我会使用其他线程，否则如果您在主线程上执行此操作，则您的应用程序将冻结）

尝试：

df %>%         
    mutate(k2 =  x[as.character(k)])

}

如何访问存储在kotlin中的块中的变量中的值

2 个答案: