Accessing local variable in lambda in Kotlin

Question

I want to save data acquired from Volley, But lambda used in VolleyRequest function(which gets json data from server) blocks it.

How should I change local variable that is in outside of lambda? Thanks in advance.

class ConDataforReturn( val title:String , val imgDataList: ArrayList<ConImgData>)

fun getConData(context: Context, idx : String):ConDataforReturn{
        val params = HashMap<String,String>()
        var cd = arrayListOf<ConImgData>()
        var title =""
        params.put("package_idx",idx)
        Log.e("idx size",idx.length.toString())
        VolleyRequest(context,params,"https://dccon.dcinside.com/index/package_detail") { response ->
            val answer = JSONObject(response)
            var json = answer.getJSONArray("detail")

            title = answer.getJSONObject("info").getString("title")
            Log.d("title",title)//Prints right data
            for (i in 0..(json.length() - 1)) {
                val v = json.getJSONObject(i)
                cd.add(ConImgData(v.getString("title"), v.getString("ext"), v.getString("path")))
            }

        }
        return ConDataforReturn(title,cd)//returns ConDataforReturn("",arrayListOf<ConImgData>())
    }

maybe this is of some use to you ?

a_local_nobody
– a_local_nobody

2020-01-28 05:33:15 +00:00
Commented Jan 28, 2020 at 5:33 — a_local_nobody
– a_local_nobody, Commented Jan 28, 2020 at 5:33

Willi Mentzel · Accepted Answer · 2020-01-28 08:25:41Z

2

Here the the code from were you are calling this method

getConData(this, "id") { condata ->

}

Now, your method look like this,

fun getConData(context: Context, idx : String, returnConData : (condata : ConDataforReturn) -> Unit){
        val params = HashMap<String,String>()
        var cd = arrayListOf<ConImgData>()
        var title =""
        params.put("package_idx",idx)
        Log.e("idx size",idx.length.toString())
        VolleyRequest(context,params,"https://dccon.dcinside.com/index/package_detail") { response ->
            val answer = JSONObject(response)
            var json = answer.getJSONArray("detail")

            title = answer.getJSONObject("info").getString("title")
            Log.d("title",title)//Prints right data
            for (i in 0..(json.length() - 1)) {
                val v = json.getJSONObject(i)
                cd.add(ConImgData(v.getString("title"), v.getString("ext"), v.getString("path")))
            }
            returnConData(ConDataforReturn(title,cd)) //returns ConDataforReturn("",arrayListOf<ConImgData>())
        }
    }

edited Jan 28, 2020 at 8:25

Willi Mentzel

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answered Jan 28, 2020 at 5:49

Patibandha Parth

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1 Comment

Patibandha Parth Over a year ago

Refer this official link [kotlinlang.org/docs/reference/lambdas.html ] for Kotlin Higher Order function.

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