Loop through multiple JsonObject

Question

How can I loop through JSON with this type of structure:

{
    "name": "Jane John Doe",
    "email": "[email protected]"
},
{
    "name": "Jane Doe",
    "email": "[email protected]"
},
{
    "name": "John Doe",
    "email": "[email protected]"
}

I tried the below code but I only got the last item.

List<Object> response = new ArrayList<>();

JSONObject jsonObject = new JSONObject(json);
Iterator<?> iterator = jsonObject.keys();
while (iterator.hasNext()) {
    Object key = iterator.next();
    Object value = jsonObject.get(key.toString());

    response.add(value);
}

Seems like your JSON is not a JSONObject , but a JSONArray. — Kirill Simonov
– Kirill Simonov, Commented Feb 4, 2018 at 20:59
JSONArray jsonArray = new JSONArray(json); should solve your problem i think. Then loop and place them in the array. — Mohammad Tabbara
– Mohammad Tabbara, Commented Feb 4, 2018 at 21:02
I got a type mismatch error, json object couldn't be converted to json array. — Joshua
– Joshua, Commented Feb 4, 2018 at 21:41

Pratik Satani · Accepted Answer · 2018-02-05 06:12:13Z

3

As per your code you just get the key and value of the first object.

JSONObject jsonObject = new JSONObject(json);

from above code, you just get the first object from JSON.

Iterator<?> iterator = jsonObject.keys();
while (iterator.hasNext()) {
Object key = iterator.next();
Object value = jsonObject.get(key.toString());
response.add(value);
}

From above code, you will get the key and values of first JSON object.

Now, if you want to get all object value then you have to change your code as per below :

Change JSON like below:

[{
  "name": "Jane John Doe",
  "email": "[email protected]"
},
{
  "name": "Jane Doe",
  "email": "[email protected]"
},
{
  "name": "John Doe",
  "email": "[email protected]"
}]

Change java code as per below:

List<HashMap<String,String>> response = new ArrayList<>();
JSONArray jsonarray = null;
    try {
        jsonarray = new JSONArray(json);
        for(int i=0;i<jsonarray.length();i++) {
            JSONObject jsonObject = jsonarray.getJSONObject(i);
            Iterator<?> iterator = jsonObject.keys();
            HashMap<String,String> map = new HashMap<>();
            while (iterator.hasNext()) {
                Object key = iterator.next();
                Object value = jsonObject.get(key.toString());
                map.put(key.toString(),value.toString());

            }
            response.add(map);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

edited Feb 5, 2018 at 6:12

answered Feb 5, 2018 at 6:03

Pratik Satani

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1 Comment

Joshua Over a year ago

Yea, that way I can hold each item separately and operate on them.

Ratilal Chopda · Accepted Answer · 2018-02-05 05:59:21Z

Your JSON is not a JSONObject, but a JSONArray,

your response should like this Valid JSON

[{
    "name": "Jane John Doe",
    "email": "[email protected]"
}, {
    "name": "Jane Doe",
    "email": "[email protected]"
}, {
    "name": "John Doe",
    "email": "[email protected]"
}]

Parsing Snippet of code

try
{
    JSONArray jsonArray = new JSONArray("Your Json Response");

    for (int i = 0; i < jsonArray.length(); i++) {

        JSONObject jsonObject = jsonArray.getJSONObject(i);

        String userName = jsonObject.getString("name");
        String userEmail = jsonObject.getString("email");

        Log.i("TAG Name " + i, " : " + userName);
        Log.i("TAG Mail " + i, " : " + userEmail);

    }
} 
catch (JSONException e) 
{
    // TODO Auto-generated catch block
    e.printStackTrace();
}

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