String to JSONArray in Java

Question

I'm trying to parse a Json result from a url (the Philips Hue emulator in this case) into a JsonArray in Android Studio. I have the following code so far:

String jsonString = serviceHandler.makeServiceCall(BASE_URL, ServiceHandler.GET);
JSONArray lights;

if (jsonString != null) {
        try {
            JSONObject jsonObject = new JSONObject(jsonString);

            lights = jsonObject.getJSONArray("lights");

            for (int i = 0; i < lights.length(); i++) {
                JSONObject l = lights.getJSONObject(i);

                String name = l.getString("name");
                String bri = l.getString("bri");
                String hue = l.getString("hue");
                String sat = l.getString("sat");
                String status = l.getString("on");
            }
        } catch (JSONException ex) {
            ex.printStackTrace();
        }
    } else {
        Log.e("ServiceHandler", "Cannot get data from the url");
    }

But, when I try to run this code I get a (...)

type org.json.JSONObject cannot be converted to JSONArray

error. I have tried some other ways to convert the string into a JsonArray or to loop through the string, but without success.

What I'm doing wrong??

Edit: The data in jsonString:

{"lights":{"1":{"state":{"on":false,"bri":254,"hue":4444,"sat":254,"xy":[0.0,0.0],"ct":0,"alert":"none","effect":"none","colormode":"hs","reachable":true},"type":"Extended color light","name":"Hue Lamp 1","modelid":"LCT001","swversion":"65003148","uniqueid":"00:17:88:01:00:d4:12:08-0a","pointsymbol":{"1":"none","2":"none","3":"none","4":"none","5":"none","6":"none","7":"none","8":"none"}},"2":{"state":{"on":false,"bri":254,"hue":23536,"sat":144,"xy":[0.346,0.3568],"ct":201,"alert":"none","effect":"none","colormode":"hs","reachable":true},"type":"Extended color light","name":"Hue Lamp 2","modelid":"LCT001","swversion":"65003148","uniqueid":"00:17:88:01:00:d4:12:08-0b","pointsymbol":{"1":"none","2":"none","3":"none","4":"none","5":"none","6":"none","7":"none","8":"none"}},"3":{"state":{"on":true,"bri":254,"hue":65136,"sat":254,"xy":[0.346,0.3568],"ct":201,"alert":"none","effect":"none","colormode":"hs","reachable":true},"type":"Extended color light","name":"Hue Lamp 3","modelid":"LCT001","swversion":"65003148","uniqueid":"00:17:88:01:00:d4:12:08-0c","pointsymbol":{"1":"none","2":"none","3":"none","4":"none","5":"none","6":"none","7":"none","8":"none"}}},"schedules":{"1":{"time":"2012-10-29T12:00:00","description":"","name":"schedule","command":{"body":{"scene":null,"on":true,"xy":null,"bri":null,"transitiontime":null},"address":"/api/newdeveloper/groups/0/action","method":"PUT"}}},"config":{"portalservices":false,"gateway":"192.168.2.1","mac":"00:00:88:00:bb:ee","swversion":"01005215","linkbutton":false,"ipaddress":"192.168.178.31:5510","proxyport":0,"swupdate":{"text":"","notify":false,"updatestate":0,"url":""},"netmask":"255.255.255.0","name":"Philips hue","dhcp":true,"proxyaddress":"","whitelist":{"newdeveloper":{"name":"test user","last use date":"2016-04-06T16:51:26","create date":"2012-10-29T12:00:00"}},"UTC":"2012-10-29T12:05:00"},"groups":{"1":{"name":"Group 1","action":{"on":true,"bri":254,"hue":33536,"sat":144,"xy":[0.346,0.3568],"ct":201,"alert":null,"effect":"none","colormode":"xy","reachable":null},"lights":["1","2"]}},"scenes":{}}

can you show what you are trying to parsing?

Aiyaz Parmar
– Aiyaz Parmar

2016-04-06 16:33:55 +00:00
Commented Apr 6, 2016 at 16:33 — Aiyaz Parmar
– Aiyaz Parmar, Commented Apr 6, 2016 at 16:33
lights is not a type jsonarray post your json string

Rod_Algonquin
– Rod_Algonquin

2016-04-06 16:34:20 +00:00
Commented Apr 6, 2016 at 16:34 — Rod_Algonquin
– Rod_Algonquin, Commented Apr 6, 2016 at 16:34
lights is a JSONObject and not an array

Pedro Oliveira
– Pedro Oliveira

2016-04-06 16:35:47 +00:00
Commented Apr 6, 2016 at 16:35 — Pedro Oliveira
– Pedro Oliveira, Commented Apr 6, 2016 at 16:35
Added the jsonString data. Lights is a JSONArray.

NVO
– NVO

2016-04-06 16:35:58 +00:00
Commented Apr 6, 2016 at 16:35 — NVO
– NVO, Commented Apr 6, 2016 at 16:35
here lights is jsonobject you can't parse it to jsonarray

Aiyaz Parmar
– Aiyaz Parmar

2016-04-06 16:36:12 +00:00
Commented Apr 6, 2016 at 16:36 — Aiyaz Parmar
– Aiyaz Parmar, Commented Apr 6, 2016 at 16:36

Ravi Theja · Accepted Answer · 2016-04-06 16:46:37Z

1

the key "lights" maps to a JSONObject and you are converting it to a JSONArray hence the exception.Change the line

lights = jsonObject.getJSONArray("lights");

to

JSONObject lights = jsonObject.getJSONObject("lights");

answered Apr 6, 2016 at 16:46

Ravi Theja

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Comments

Dmitri Timofti · Accepted Answer · 2016-04-06 16:53:49Z

The problem is that "lights" is not a JSONArray but a JSONObject. So to retrieve the contents of "lights" you need to iterate through all the objects of "lights" using the keys() method.

Replace the code from your try block with the following code to iterate through all the objects inside "lights".

 JSONObject jsonObject = new JSONObject(jsonString);
 JSONObject lights = jsonObject.getJSONObject("lights");
 Iterator<String> keyIterator = lights.keys();

 while (keys.hasNext()) {
     String key = keyIterator.next();
     JSONObject l = lights.getJSONObject(key);

     String name = l.getString("name");
     String bri = l.getString("bri");
     String hue = l.getString("hue");
     String sat = l.getString("sat");
     String status = l.getString("on");
 }

Pooya · Accepted Answer · 2016-04-06 16:51:02Z

The following code should work for you:

String jsonString = serviceHandler.makeServiceCall(BASE_URL, ServiceHandler.GET);

if (jsonString != null) {
    try {
        JSONObject jsonObject = new JSONObject(jsonString);


        for (int 1 = 1; i <= 3; i++) {
            JSONObject l = jsonObject.getJSONObject("lights").getJSONObject(Integer.toString(i));

            String name = l.getString("name");
            String bri = l.getString("bri");
            String hue = l.getString("hue");
            String sat = l.getString("sat");
            String status = l.getString("on");
        }
    } catch (JSONException ex) {
        ex.printStackTrace();
    }
} else {
    Log.e("ServiceHandler", "Cannot get data from the url");
}

Community · Accepted Answer · 2017-05-23 12:24:14Z

0

How to parse the JSON objects with each different key and value, using Java? visit this link.. and there you can access different key and values with that. so you don't have to worry about key. and you are having key like "1" and "2" and so on. so just iterate through lights object and you will get your answer. if you have any problem with that feel free to ask.

JSONObject json = new JSONObject("<jsonString>");
Iterator<String> keys = json.keys();

while (keys.hasNext()) {
    String key = keys.next();
    System.out.println("Key :" + key + "  Value :" + json.get(key));
}

from this you will get key and after that you have to just get values of that object.

edited May 23, 2017 at 12:24

CommunityBot

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answered Apr 6, 2016 at 16:42

Aiyaz Parmar

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Comments

user6166867 · Accepted Answer · 2016-04-07 14:12:45Z

0

In your JSONObject every key maps to a JSONObject not to a JSONArray. So you have to read like this from your JSONObject

JSONObject lights = jsonObject.getJSONObject("lights");

JSONObject schedules = jsonObject.getJSONObject("schedules");

JSONObject config = jsonObject.getJSONObject("config");

JSONObject groups = jsonObject.getJSONObject("groups");

JSONObject scenes = jsonObject.getJSONObject("scenes");

Hope it will help for you.

answered Apr 7, 2016 at 14:12

user6166867

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