Android Parse multiple JSON arrays

Question

I tried to parse multiple JSON arrays that my server returns to my application.

The structure of the returned message from the server looks like this:

[ json objects ][ json objects ]

returned message :

[{"latitude":"44.33","longitude":"44.33","name":"test1","Notification":"true"}][{"latitude":"44.33","longitude":"44.33","name":"test2","Notification":"false"}]

Now I tried to parse this and get the Notification status (true / false) but I did not get the item i needed.

  try {

       JSONArray jr = new JSONArray(answer);
       JSONObject jb = (JSONObject)jr.getJSONObject(0);
       JSONArray nof = jb.getJSONArray("Notification");
       Log.d("Json", String.valueOf(nof));
  }catch(Exception e)
  {
       e.printStackTrace();
  }

I would be happy if someone can help me to understand what I need todo to achieve my mission.

You can rather use GSON for parsing, it is much easier. Use GsonFormatter Android studio plug-in for creating model classes — Amey Jahagirdar
– Amey Jahagirdar, Commented Mar 24, 2017 at 8:24
what is answer in your first line? and do you get any error? — Prashant
– Prashant, Commented Mar 24, 2017 at 8:24
Yes I get the next error - " Value true at Notification of type java.lang.String cannot be converted to JSONArray " — asaproG
– asaproG, Commented Mar 24, 2017 at 8:27
Your return message is not a valid JSON. Try wrapping those arrays in an array with a key. Like this: hastebin.com/amohisened.json — erkangur
– erkangur, Commented Mar 24, 2017 at 8:27
You should use String nof = jb.getString("Notification"); instead of JSONArray nof = jb.getJSONArray("Notification"); and to print you can simply print value of nof like Log.d("Json", nof); — Prashant
– Prashant, Commented Mar 24, 2017 at 8:31

rafsanahmad007 · Accepted Answer · 2017-03-24 08:38:14Z

2

Your Json response is invalid...

This is the valid JSON:

  [
    [{
        "latitude": "44.33",
        "longitude": "44.33",
        "name": "test1",
        "Notification": "true"
    }],
    [{
        "latitude": "44.33",
        "longitude": "44.33",
        "name": "test2",
        "Notification": "false"
    }]
  ]

to parse it:

try{
JSONArray json = new JSONArray(answer);
for(int i=0;i<json.length();i++){
     JSONArray array = json.getJSONArray(i);
         for(int i=0;i<array.length();i++){
            JSONObject object = array.getJSONObject(i);
            String Notification = object.getString("Notification");

        }
    }
 }
 catch (JSONException e){
       e.printStackTrace();
}

edited Mar 24, 2017 at 8:38

answered Mar 24, 2017 at 8:33

rafsanahmad007

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6 Comments

Prashant Over a year ago

he is getting error when trying to get value of Notification , exception should be something else if it is invalid json. i thinks it's mistake in posting question , see comments in question

rafsanahmad007 Over a year ago

that why i said...it is not a valid JSON

asaproG Over a year ago

I try this but in the line " JSONArray array = json.getJSONArray(i); " I get the error - " Value at 0 of type org.json.JSONObject cannot be converted to JSONArray "

rafsanahmad007 Over a year ago

okay in your response u r getting ,,a JSON object...post the full response...the response u posted on question is wrong!

asaproG Over a year ago

The problem is the size of the array when I check him is 1 and it need to be 2 ( json.length() ) so in your code it's get only the first element and that make the problem. how I get all the elements of the array ?

|

Alberto Brambilla · Accepted Answer · 2017-03-24 08:29:22Z

0

That Json response can't be parsed as a whole. Formally it is not json valid, there are two json arrays that concatenate like that do not make a valid json.

You can wrap those array in a unique json object and that object is now parsable with your code.

{"array1":[],"array2":[]}

Then you can instantiate the jsonObject and get each array separately with their name

answered Mar 24, 2017 at 8:29

Alberto Brambilla

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2 Comments

asaproG Over a year ago

Thanks, but how I can convert my correct return string to the type like you answer ?

Alberto Brambilla Over a year ago

It depends on the language you are using on the server side to generate that json

Ankit Aman · Accepted Answer · 2017-03-24 08:42:58Z

0

Create a POJO of Response lets say Notification.java

JSONArray resultArray = response.getJSONArray("result");// your json response

// using Gson Library By google

compile 'com.google.code.gson:gson:2.7.0'

List<Notification> notificationList = new    Gson().fromJson(String.valueOf(resultArray),Notification.class);

answered Mar 24, 2017 at 8:42

Ankit Aman

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