Android: Dynamically Get JSON Array Key Name From JSON

Question

I have a json link, if we open it I get a following result

{
"Status": "Success",

"All_Details": [{
    "Types": "0",
    "TotalPoints": "0",
    "ExpiringToday": 0
}],
"First": [{
    "id": "0",
    "ImagePath": "http://first.example.png"
}],
"Second": [{
    "id": "2",
    "ImagePath": "http://second.example.png"
}],
"Third": [{
    "id": "3",
    "ImagePath": "http://third.example.png"
}],

}

What I need is, I want to dynamically get all the key names like status, All_details, First etc.

And I also want to get the data inside the All_details and First Array. I used following method

@Override
        public void onResponse(JSONObject response) throws JSONException {
            VolleyLog.d(TAG, "Home Central OnResponse: " + response);

            String statusStr = response.getString("Status");
            Log.d(TAG, "Status: " + statusStr);

            if (statusStr.equalsIgnoreCase("Success")) {
                Iterator iterator = response.keys();
                while (iterator.hasNext()) {
                    String key = (String)iterator.next();
                }
            }
        }

I get all the key names in get stored in the String key. But I am unable to open get the values inside the JSON array, for eg. I need to get the values inside first and second array using the String(Key). How can I do that.???

score 10 · Accepted Answer · edited Sep 03 '18 at 23:02

First, to get the keynames, you can easily iterate through the JSONObject itself as mentioned here:

Iterator<?> keys = response.keys();
while( keys.hasNext() ) {
    String key = (String)keys.next();
    if ( response.get(key) instanceof JSONObject ) {
        System.out.println(key); // do whatever you want with it
    }
}

Then, to get the values of the array:

    JSONArray arr = response.getJSONArray(key);
    JSONObject element;
    for(int i = 0; i < arr.length(); i++){
        element = arr.getJSONObject(i); // which for example will be Types,TotalPoints,ExpiringToday in the case of the first array(All_Details) 
    }

@IndependentDev You are welcome, and glad I could help you :) — Muhammed Refaat, Mar 08 '16 at 11:54

score 1 · Answer 2 · answered Mar 08 '16 at 11:10

If you want to get the JSON array from the response JSONObject you can use the JSONArray class. JSONObject has a method to get a JSONArray: getJSONArray(String). Remember to catch the JSONException when trying this. This exception will be thrown if there is no key for example.

Your code could look like this (only the while loop):

while (iterator.hasNext()) {
    String key = (String)iterator.next();
    try {
        JSONArray array = response.getJSONArray(key);
        // do some stuff with the array content
    } catch(JSONException e) {
        // handle the exception.
    }
}

You can get the values from the array with the methods of JSONArray (see the documentation)

score 0 · Answer 3 · answered Mar 08 '16 at 11:05

0

Something like this will allow you to iterate on array and individual fields once you have extracted the keys using what you have done. Instead of "Types" use the key variable you will create before this.

JSONArray allDetails = response.getJsonArray("All_Details")

for (int i = 0 ; i < allDetails.length(); i++) {
    JSONObject allDetail = allDetails.getJSONObject(i);
    allDetails.getString("Types");
}

answered Mar 08 '16 at 11:05

Bhushan Bhangale

10,921
5
43
71

I dont need this method. I want to dynamically get the array names(for eg: All_details) and using this I want to dynamically get the values inside that array. – Encipherer Mar 08 '16 at 11:36

score 0 · Answer 4 · answered Mar 08 '16 at 11:10

0

First of all I want to inform you that it's not a valid JSON. Remove the last Comma (,) to make it valid.

Then you can Iterate like here

JSONArray myKeys = response.names();

answered Mar 08 '16 at 11:10

Shree Krishna

8,474
6
40
68

score 0 · Answer 5 · answered Mar 08 '16 at 12:02

Try this one

Iterator keys = jsonObject.keys();
    while (keys.hasNext()) {
        try {
            String dynamicKey = (String) keys.next();//Your dynamic key
            JSONObject item = jsonObject.getJSONObject(dynamicKey);//Your json object for that dynamic key
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

Android: Dynamically Get JSON Array Key Name From JSON

5 Answers5

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