Using Kotlin to parse nested json array/object-CodePudding

I've read a few posts on here saying to use gson or something else. Android Kotlin parsing nested JSON

I am planning on switching to gson later but wondering how to parse with kotlin.

JSON object:

{
   "childScoresList":[     // line 1,2 gets the JSON array
   {
         "child_id":"1",
         "score_date":"2022-03-27",
         "category_id":"1",
         "category_name":"Preschool Math",    // line 3,4 gets this data
         "classes":[
         {
               "category_name":"Preschool Math",    
               "class_name":"Number Blocks",       // How do I get class_name which is nested? 
               "class_id":"1",
               "class_description":"Ones, Tens, Hundreds Blocks used to create given numbers.",
               "skills":[
               {
                     "skill_id":"1",
                     "skill_name":"Place Value",   // After I figure out class_name, skill_name should be very similar
                     "skill_description":"Knowing the place value of specific elements.",
                     "skill_score":"50"
               },

Kotlin code:

1   val obj = JSONObject(response.toString())
2   val jsonArray = obj.getJSONArray("childScoresList")
3   for (i in 0 until jsonArray.length()) {
4        val categoryName = jsonArray.getJSONObject(i).getString("category_name")
5    }

How do I get data in class_name? I tried various things but could not get it to work.

CodePudding user response：

You must first get JSONArray from the object according to the following code and then access the class_name variable

val obj = JSONObject(js)
val jsonArray = obj.getJSONArray("childScoresList")
for (i in 0 until jsonArray.length()) {
    val classes = jsonArray.getJSONObject(i).getJSONArray("classes")
    for (x in 0 until classes.length()) {
        val categoryName = classes.getJSONObject(x).getString("category_name")
        val className = classes.getJSONObject(x).getString("class_name")
    }
}