CODEWITHSUNDEEP
javaandroidarraysjson
PowerMan2015
PowerMan2015

Reputation: 1418

JSONArray Parsing error

I need help with parsing a JSON array.

[
    {
        "Header1": [
            {
                "path": "upload/images/1430572021716.jpg"
            },
            {
                "path": "upload/images/1430574003703.jpg"
            }
        ]
    },
    {
        "Header2": [
            {
                "path": "upload/images/1430574124119.jpg"
            },
            {
                "path": "upload/images/1430574203001.jpg"
            }
        ]
    }
]

I am receiving the above JSONArray perfectly. I want to iterate through the array and extract both the header text "Header1" and the value of path

I keep running into the following error message

at 0 of type org.json.jsonarray cannot be converted to jsonobject

after some research, this is due to the system not being able to parse to a JSON array. It does work if I change the "list" array to an objct, however this is not an array and i loose the ability to iterate through it.

Here is the code i tried to parse the array with

    JSONArray mArray;

    mArray = json;

    //download json array
    for (int i = 0; i < mArray.length(); i++) {
        if(mArray != null) {
            JSONArray list = mArray.getJSONArray(i);
            if(list != null) {
                for(int a = 0; a < list.length();a++) {
                    JSONObject elem = list.getJSONObject(a);
                    if (elem != null) {
                            listdata.add(elem.getString("path"));

                    }
                }
            }
        }
    }

Upvotes: 1

Views: 1065

Answers (4)

rajitha
rajitha

Reputation: 1

This works for JavaScript and very simple.

//mArray is your json array
let newArray = JSON.stringify(mArray);
mArray = JSON.parse(newArray);

Upvotes: 0

N Jay
N Jay

Reputation: 1824

A much easier way for you to handle this would be to use GSON library and create POJO class to resemble ur JSON here is a nice website to do that

Upvotes: 1

Jon Skeet
Jon Skeet

Reputation: 1500185

You're trying to treat each element of the top-level array as another array - it's not, it's an object. That object then has another field whose value is an array. So you want something like:

for (int i = 0; i < json.length(); i++) {
    JSONObject container = json.getJSONObject(i);
    // We don't know the property name, but there's only one, apparently...
    String key = container.keys().next();
    JSONArray subarray  = container.getJSONArray(key);
    for (int j = 0; j < subarray.length(); j++) {
        listdata.add(subarray.getJSONObject(j).getString("path"));
    }
}

Upvotes: 2

Mena
Mena

Reputation: 48404

The second level of your JSON consists in your JSON array elements.

What you need, as you already mention, is to get them as JSONObject.

Then you getJSONArray from that object:

//download json array
for (int i = 0; i < mArray.length(); i++) {
    if(mArray != null) {
        JSONObject element = mArray.getJSONObject(i);
        JSONArray list = element.getJSONArray("Header1");
        if(list != null) {

However, since the "Header..." keys are changing, you might need to infer the key by invoking keys().

Upvotes: 1

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