display single array json data in android?

Question

i am trying to display json data in an android application but i have having difficulty i think is may have to do with the way the json file was formated .i want to get the value of name and code in the headers array. and it is not working

this is the json file

 {
"status": "SUCCESS",
"headers": 
{
"id": "4",
"name": "GLO",
"code": "GLO",
"background_color_code": "15B709",
"text_color_code": "ffffff",
"statusMessage": "Hi +234805, an ACCESS FEE of N20.00 will be charged in order to access this Platform"
},
"statusMessage": "Movies Loaded successfully",
"caption": "Discover"
}

this is the java code

 protected ArrayList<HashMap<String, String>> doInBackground(Void... arg0) {

            ArrayList<HashMap<String, String>> categoryList = new ArrayList<HashMap<String, String>>();
            jParser = new JSONParser();

            JSONObject json = jParser.getJSONFromUrl(URL_CATEGORY);

            try {
                  JSONObject categories =json.getJSONObject("headers");

                   String state = categories.getString("name");
                    String status = categories.getString("code");

                    HashMap<String, String> map = new HashMap<String, String>();
                    map.put(TAG_PIC, state);
                    map.put(TAG_NOTE, status);
                    categoryList.add(map);


            }catch (Throwable e){
                e.printStackTrace();
            }
            return categoryList;
        }

this is the error

07-25 11:05:50.766  15683-15697/com.example.cann I/System.out﹕ close [socket][/10.187.206.124:36118]
07-25 11:05:50.781  15683-15702/com.example.cann W/System.err﹕ org.json.JSONException: Value  at headers of type java.lang.String cannot be converted to JSONObject
07-25 11:05:50.782  15683-15702/com.example.cann W/System.err﹕ at org.json.JSON.typeMismatch(JSON.java:100)
07-25 11:05:50.782  15683-15702/com.example.cann W/System.err﹕ at org.json.JSONObject.getJSONObject(JSONObject.java:613)
07-25 11:05:50.782  15683-15702/com.example.cann W/System.err﹕ at com.example.cann.CategoryActivity$LoadComments.doInBackground(CategoryActivity.java:81)
07-25 11:05:50.782  15683-15702/com.example.cann W/System.err﹕ at com.example.cann.CategoryActivity$LoadComments.doInBackground(CategoryActivity.java:60)

are you able to get data in getJSONFromUrl method ? try to print response and put it here — Vickyexpert, Jul 25 '16 at 10:49
What do you get here `JSONObject json = jParser.getJSONFromUrl(URL_CATEGORY);` — Murat Karagöz, Jul 25 '16 at 10:54

score 1 · Answer 1 · edited Jul 25 '16 at 11:24

1

You can try with

try {
    JSONObject reader = new JSONObject(Your_URL);
    JSONArray jsonArray = reader.getJSONArray("headers");

    for (int i = 0; i < jsonArray.length(); i++) {
        JSONObject e = jsonArray.getJSONObject(i);
        String name= e.getString("name");
    }
} catch (JSONException e) {
    e.printStackTrace();
}

edited Jul 25 '16 at 11:24

Jordi Castilla

26,609
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answered Jul 25 '16 at 11:04

IntelliJ Amiya

74,896
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score 0 · Answer 2 · answered Jul 25 '16 at 10:53

0

Try this

 try {
        JSONObject rootJsonObject = new JSONObject(response);
        if (rootJsonObject.getString("status").equalsIgnoreCase("SUCCESS")) {
            JSONObject headerJsonObject = new JSONObject(rootJsonObject.getString("headers"));
            String name = headerJsonObject.getString("name");
            String code = headerJsonObject.getString("code");
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

answered Jul 25 '16 at 10:53

Dexto

1,151
9
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where does the response varable come from – arinze Jul 25 '16 at 10:59
that is the server response in string – Dexto Jul 25 '16 at 11:02
this is what i am getting 07-25 12:10:49.206 28912-28926/? W/System.err﹕ org.json.JSONException: End of input at character 0 of 07-25 12:10:49.208 28912-28926/? W/System.err﹕ at org.json.JSONTokener.syntaxError(JSONTokener.java:449) – arinze Jul 25 '16 at 11:11
JSONObject json = jParser.getJSONFromUrl(URL_CATEGORY);String response = json.toString(); – Dexto Jul 25 '16 at 11:18

score 0 · Answer 3 · answered Jul 25 '16 at 10:56

0

You can use Gson (Complete Tutorial) or Jackson (Complete Tutorial)

answered Jul 25 '16 at 10:56

am110787

316
1
2
9

Jordi Castilla · Answer 4 · 2016-07-25T11:47:27.750

0

Your method seems too much complex, appart, your problem is you need to read headers attribute before reading the other attributes.

Using com.google.gson.GSon

protected static void read() throws Exception {
    com.google.gson.Gson jParser = new com.google.gson.Gson();

    Reader r = new BufferedReader(new FileReader(new File(FILE_PATH)));

    // get all the object
    JsonObject json = jParser.fromJson(r, JsonObject.class);

    // get headers object
    JsonObject members = json.get("headers").getAsJsonObject();

    // get attributes inside headers!
    System.out.println(members.get("id"));
    System.out.println(members.get("name"));
    System.out.println(members.get("statusMessage"));
}

OUTPUT:

"4"
"GLO"
"Hi +234805, an ACCESS FEE of N20.00 will be charged in order to access this Platform"

Download here the jar files

What varable is FILE_PATH – arinze 3 mins ago

Is a path where I placed the file with content you put in your question, in my case:

String FILE_PATH = "D:\\Users\\jordi\\datos.txt";

but you must put your own path.... anyway, if you need get a Reader from an URL just use this example:

URL url = new URL("http://your-json-url");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

edited Jul 25 '16 at 11:47

answered Jul 25 '16 at 11:12

Jordi Castilla

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8
70
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looks like perfect . – IntelliJ Amiya Jul 25 '16 at 11:15
where is the gson varable. where do i download it – arinze Jul 25 '16 at 11:17
1

@arinze no need to GSON . Please check his logic just – IntelliJ Amiya Jul 25 '16 at 11:19
1

@arinze updated my answer with link to har, but Amiya is right, if you need to use your JSON library just take a look at the logic, if you can change to GSon – Jordi Castilla Jul 25 '16 at 11:23
what varable is filepath – arinze Jul 25 '16 at 11:45
as you can guess... the path to your file!!! `xD` in my case: `private static final String FILE_PATH = "D:\\Users\\jordi\\datos.txt";` but you must put your own path.... – Jordi Castilla Jul 25 '16 at 11:47
@arinze please kindly check my last update clarifying the source of the json – Jordi Castilla Jul 25 '16 at 11:52
did what you suggested this is what i am gettting "07-25 13:33:59.608 6292-6306/? W/System.err﹕ java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.gson.JsonElement com.google.gson.JsonObject.get(java.lang.String)' on a null object reference" – arinze Jul 25 '16 at 12:37
http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it – Jordi Castilla Jul 25 '16 at 12:54
also find here http://stackoverflow.com/a/38436453/3850595 an example of reading JSON from an URL – Jordi Castilla Jul 25 '16 at 13:01
1

@IntelliJAmiya I do... people don't like to listen how they can improve their code and delete her answer downvoting the suggestor ;). – Jordi Castilla Jul 26 '16 at 08:44

display single array json data in android?

4 Answers4