Parsing individual elements of a JSON array

Question

I want to parse a json array and get its individual elements in android. I have my json file in asset folder. This is type of my json:

{
   "name":"hello",
   "data":[1,2,3,4]
}

I want to get the elements of "data" key such as "1","2","3",& "4" so that I can add it to an array list.The file name is gaitData.json. I tried this method but its not able to read individual elements of array "data". Please help!!

     InputStream is = MainActivity.this.getAssets().open("gaitdata.json");
        int size = is.available();
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();
        json=new String(buffer,"UTF-8");
        JSONObject object=new JSONObject(json);
        JSONArray hip_min=object.getJSONArray("hip_min");

After this step I iterate the hip_min array using for loop but that does not work either.

Are you you looking to learn the specifics of JSON or just want to parse it as quick as possible? If the latter I would recommend: github.com/square/moshi — Blundell
– Blundell, Commented Jul 14, 2019 at 20:11

MALNEEDI VAMSI · Accepted Answer · 2019-07-16 20:21:14Z

1

You can get array values like this,

String jsonString = getAssetJsonData("gaitdata.json");
ArrayList<String> list = new ArrayList<>();
try {
    JSONObject jsonObject = new JSONObject(jsonString);
    JSONArray jsonArray = (JSONArray) jsonObject.get("data");
    if (jsonArray != null) {
            for (int i = 0; i < jsonArray.length(); i++) {
                String str = (String) jsonArray.get(i).getValue();
                list.add(str);
            }
    }
} catch (JSONException e) {
       e.printStackTrace();
}

Here is getAssetJsonData() method,

public String getAssetJsonData(String fileName) {
        String json = null;
        try {
            InputStream is = getAssets().open(fileName);
            int size = is.available();
            byte[] buffer = new byte[size];
            is.read(buffer);
            is.close();
            json = new String(buffer, "UTF-8");
       } catch (IOException ex) {
            ex.printStackTrace();
            return null;
       }

        Log.e("data", json);
        return json;
    }

edited Jul 16, 2019 at 20:21

answered Jul 14, 2019 at 20:17

MALNEEDI VAMSI

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3 Comments

Kundan Jha Over a year ago

but 'jsonArray = (JSONArray) jsonObject.get("data"); ' will give me the entire array is it? How will I access the elements within it. Shall I use again get method.

Kundan Jha Over a year ago

also it tell me handle exception for the first code you type and when I do so it does not read the data.

Kundan Jha Over a year ago

Thanks for the support. Finally now I am able to parse the data using json. Thumbs up for you!!.

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