Value of type java.lang.String cannot be converted to JSONArray

Question

I have a very big constant JSONArray coming from Webservice, in order to reduce data transfer, I wanted to put it in Android. I logged all JSONArray(coming from webservice), put it inside a string and converted to JSONArray. Here is the code I wrote :

String additionString =  ""Additions":[{"AdditionID":0,"Type":-1,"Long":" ","Short":" "},{"AdditionID":8,"Type":6,"Long":"English,"Short":"Eng"},{"AdditionID":11,"Type":2,"Long":"French","Short":"Fr."},{"AdditionID":12,"Type":2,"Long":"German","Short":"Ger."}]";

JSONArray AdditionArray = new JSONArray(additionString);

And I'm getting this error for that :

Value Additions of type java.lang.String cannot be converted to JSONArray

By the way, the string looks like this in Android Studio :

 String additionString =  "\"Additions\":[{\"AdditionID\":0,\"Type\":-1,\"Long\":\" \",\"Short\":\" \"},{\"AdditionID\":8,\"Type\":6,\"Long\":"English,\"Short\":\"Eng\"},{\"AdditionID\":11,\"Type\":2,\"Long\":\"French\",\"Short\":\"Fr.\"},{"AdditionID":12,"Type":2,"Long":"German","Short":"Ger."}]";

How can I convert that String to JSONArray? Thanks.

the syntax you are using is used to extract json element not put the new one.. — Iamat8, Nov 19 '15 at 09:40
@Mohit Why can't I generate a new JSONArray like this? or how can I generate one with that log? — jason, Nov 19 '15 at 09:41
`"Additions":[....]` is not a json array, more over, it is not valid json at all — Selvin, Nov 19 '15 at 09:41
[this answer](http://stackoverflow.com/a/17810270/2553431) will help you understand how to make `JSONArray` — Iamat8, Nov 19 '15 at 09:52

score 2 · Accepted Answer · answered Nov 19 '15 at 09:44

 ""Additions":[{"AdditionID":0,"Type":-1,"Long":" ","Short":" "},{"AdditionID":8,"Type":6,"Long":"English,"Short":"Eng"},{"AdditionID":11,"Type":2,"Long":"French","Short":"Fr."},{"AdditionID":12,"Type":2,"Long":"German","Short":"Ger."}]"

is neither a valid JSONObject nor a valid JSONArray. A JSONObject starts and ends with {}

{
    "Additions": [
        {
            "AdditionID": 0,
            "Type": -1,
            "Long": " ",
            "Short": " "
        },
        {
            "AdditionID": 8,
            "Type": 6,
            "Long": "English",
            "Short": "Eng"
        }
    ]
}

a valid JSONArray would be

[
    {
        "AdditionID": 0,
        "Type": -1,
        "Long": " ",
        "Short": " "
    },
    {
        "AdditionID": 8,
        "Type": 6,
        "Long": "English",
        "Short": "Eng"
    }
]

Navin Gupta · Answer 2 · 2015-11-19T10:09:05.080

1

A JSONArraystarts with [] and JSONObject starts with{}.

So if you want to convert String in JSONArray than change your string to

String additionString =  "[{'AdditionID':0,'Type':-1,'Long':' ','Short':' '},
{'AdditionID':8,'Type':6,'Long':'English','Short':'Eng'},
{'AdditionID':11,'Type':2,'Long':'French','Short':'Fr.'},
{'AdditionID':12,'Type':2,'Long':'German','Short':'Ger.'}]";

edited Nov 19 '15 at 10:09

answered Nov 19 '15 at 09:57

Navin Gupta

793
6
20

score 1 · Answer 3 · answered Nov 19 '15 at 10:13

There is problem in json string you are parsing("Long":"English does not end with ").Also, string should be a jsonobject(within {}) or jsonArray. So,You can do the required one as follows:

String s="{\"Additions\":[{\"AdditionID\":0,\"Type\":-1,\"Long\":\" \",\"Short\":\" \"},{\"AdditionID\":8,\"Type\":6,\"Long\":\"English\",\"Short\":\"Eng\"},{\"AdditionID\":11,\"Type\":2,\"Long\":\"French\",\"Short\":\"Fr.\"},{\"AdditionID\":12,\"Type\":2,\"Long\":\"German\",\"Short\":\"Ger.\"}]}";


        JSONObject jsonObject=new JSONObject(s);
        JSONArray jsonArray=jsonObject.getJSONArray("Additions");

        System.out.print(jsonArray.getJSONObject(0).getString("Type"));

Value of type java.lang.String cannot be converted to JSONArray

3 Answers3