Question 185219 in Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

How do I convert a JSONArray to a multidimensional arraylist?

My code:

try {
    JSONArray array = new JSONArray(response.body());
    List<JSONArray> arr = new ArrayList<>();
    for (int i = 0; i < array.length(); i++) {
        arr.add(array.getJSONArray(i));
    }
    Log.d("arr",arr.toString());
}catch (JSONException e) {
    throw new RuntimeException(e);
}

This is my arr:

[["bdbd","hdhs","hdhd","1234567890","[[shhs, sbbs, married], [sjsn, snsn, unmarried]]"]]

I want to convert the last element inside my arr

"[[shhs, sbbs, married], [sjsn, snsn, unmarried]]"

to a multidimensional ArrayList (ArrayList<ArrayList<String>>). How do I do this?

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    After finding no other solution, I just iterated over the whole string and appended each element to the arraylist like this:

    String temp = arr.get(0).get(4).toString();
String details = "";
ArrayList<String> temp1 = new ArrayList<>();
ArrayList<ArrayList<String>> final = new ArrayList<>();
for(int i=2; i<temp.length()-1; i++){
    if(temp.charAt(i) != ',' && temp.charAt(i) != ' ' && temp.charAt(i) != '['){
        if(temp.charAt(i) != ']')
            details += temp.charAt(i);
        else{
            temp1.add(details);
            final.add(temp1);
            temp1 = new ArrayList<>();
            details = "";
        }
    }
    else{
        if(!details.equals("")) {
            temp1.add(details);
        }
        details = "";
    }
}

  2. 0

    There is a one liner solution. Don’t use json.org library use Jackson Json library. In this case all you veed to do is

    ObjectMapper om = new ObjectMapper();
List<Object> myList = om.readValue(response.body(), List.class);

    Also, there is a JsonUtil class that is a thin wrapper over ObjectMapper that allows you to do the same without instantiating ObjectMapper:

    List<Object> myList = JsonUtils.readObjectFromJsonString(response.body(), List.class);

    JsonUtils comes with MgntUtils OpenSource library written and maintained by me. You can get it as a Maven artifact or on Github (including javadoc and source code). Here is Javadoc for JsonUtils class

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search