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I have some JSON (shown below), I am trying to parse through the entire JSON, and each object will be a new instance of a class that declares the variables below. What is the best way to do this? Should I use a JSONReader or use JSONObject and JSONArray. Ive been reading some tutorials and asking some general questions, but I havent seen any examples of how to parse out data like this.

{
    "id": 356,
    "hassubcategories": true,
    "subcategories": [
        {
            "id": 3808,
            "CategoryName": "Current Products",
            "CategoryImage": null,
            "hassubcategories": true,
            "subcategories": [
                {
                    "id": 4106,
                    "CategoryName": "Architectural",
                    "CategoryImage": "2637",
                    "hassubcategories": true,
                    "subcategories": [
                        {
                            "id": 391,
                            "CategoryName": "Flooring",
                            "CategoryImage": "2745",
                            "hassubcategories": false
                        }
                    ]
                }
            ]
        },
        {
            "id": 3809,
            "CategoryName": "Non-Current Products",
            "CategoryImage": null,
            "hassubcategories": true,
            "subcategories": [
                {
                    "id": 4107,
                    "CategoryName": "Desk",
                    "CategoryImage": "2638",
                    "hassubcategories": true,
                    "subcategories": [
                        {
                            "id": 392,
                            "CategoryName": "Wood",
                            "CategoryImage": "2746",
                            "hassubcategories": false
                        }
                    ]
                }
            ]
        }
    ]
}
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4 Answers 4

up vote 1 down vote accepted

if i were to do it, i will parse the whole string to a JSONObject

JSONObject obj = new JSONObject(str);

then i see that your subcategories is an JSONArray. So i will convert it like this

JSONArray arr = new JSONArray(obj.get("subcategories"));

with this you can do a loop and instantiate your class object

for(int i = 0; i < arr.length; i++)
JSONObject temp = arr.getJSONObject(i);
Category c = new Category();
c.setId(temp.get("id"));
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up vote 1 down vote

GSON is the easiest way when you have to work with nested objects.

like this:

//after the fetched Json:
Gson gson = new Gson();

Event[] events = gson.fromJson(yourJson,  Event[].class);

//somewhere nested in the class:
static class Event{
    int id;
    String categoryName;
    String categoryImage;
    boolean hassubcategories;
    ArrayList<Event> subcategories;
}

You can check this tutorial, http://androidsmith.com/2011/07/using-gson-to-parse-json-on-android/ or http://www.javacodegeeks.com/2011/01/android-json-parsing-gson-tutorial.html or http://www.androidhive.info/2012/01/android-json-parsing-tutorial/

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up vote 0 down vote

The example JSON data you posted does not seem to follow the JSON's data structure. You will need to construct you data exactly the same way as taught in the third link posted by Mustafa. This is a really great tutorial. I followed the steps and it really works!

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up vote 0 down vote

You can use JSON Object/ JSON Array only if the size of your json data is less than 1MB. Else you should go with JSONReader. JSONReader actually use streaming approach while JSONObject and JSONArray eventually load all the data on RAM at once which causes OutOfMemoryException in case of bigger json.

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