parsing json object with jsonarray in android

Question

hi hello I am new to android.I am getting response from server. But i get the following response..

getting the following error

Value {"Elec":"Cup1"} at 1 of type java.lang.String cannot be converted to JSONObject

The responce is as follows

{"Electronics":["{\"Elec\":\"Cup0\"}","{\"Elec\":\"Cup1\"}","{\"Elec\":\"Cup2\"}","{\"Elec\":\"Cup3\"}","{\"Elec\":\"Cup4\"}","{\"Elec\":\"Cup5\"}","{\"Elec\":\"Cup6\"}","{\"Elec\":\"Cup7\"}","{\"Elec\":\"Cup8\"}","{\"Elec\":\"Cup9\"}"],"Printable":["{\"Print\":\"Mug0\"}","{\"Print\":\"Mug1\"}","{\"Print\":\"Mug2\"}","{\"Print\":\"Mug3\"}","{\"Print\":\"Mug4\"}","{\"Print\":\"Mug5\"}","{\"Print\":\"Mug6\"}","{\"Print\":\"Mug7\"}","{\"Print\":\"Mug8\"}","{\"Print\":\"Mug9\"}"]}

And i send and receive the responce is as follows

 class SliderImages extends AsyncTask<String, String, String> {
 @Override
 protected String doInBackground(String... urls) {
 return POST1(urls[0]);
 }
 @Override
 public void onPostExecute(String result) {
 }
}
public String POST1(String url) {
 InputStream inputStream;
 String result = "";
 try {
 arraylist = new ArrayList<HashMap<String, String>>();
 // 1. create HttpClient
 HttpClient httpclient = new DefaultHttpClient();
 // 2. make POST request to the given URL
 HttpPost httpPost = new HttpPost(url);
 String json = "";
 // 3. build jsonObject
 JSONObject jsonObject = new JSONObject();
 // 4. convert JSONObject to JSON to String
 json = jsonObject.toString();
 Log.d("JsonStringSend", json);
 // ** Alternative way to convert Person object to JSON string usin Jackson Lib
 // ObjectMapper mapper = new ObjectMapper();
 // json = mapper.writeValueAsString(person);
 // 5. set json to StringEntity
 StringEntity se = new StringEntity(json);
 // 6. set httpPost Entity
 httpPost.setEntity(se);
 // 7. Set some headers to inform server about the type of the content
 httpPost.setHeader("Accept", "application/json");
 httpPost.setHeader("Content-type", "application/json");
 // 8. Execute POST request to the given URL
 HttpResponse httpResponse = httpclient.execute(httpPost);
 // 9. receive response as inputStream
 inputStream = httpResponse.getEntity().getContent();
 // 10. convert inputstream to string
 if (inputStream != null) {
 result = convertInputStreamToString(inputStream);
 Log.d("JSONResponce", result);
 JSONObject jsonObj = new JSONObject(result);
 contacts = jsonObj.getJSONArray("Electronics");
 for (int i = 1; i < contacts.length()-1; i++) {
 JSONObject c = contacts.getJSONObject(i);
 String id = c.getString("Print");
 Log.e("Errrrrrrr",""+id);
 }
 }
 } catch (IOException e) {
 e.printStackTrace();
 } catch (JSONException e) {
 e.printStackTrace();
 }
 // 11. return result
 return result;
}
private String convertInputStreamToString(InputStream inputStream) throws IOException {
 BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
 String line = "";
 String result = "";
 while ((line = bufferedReader.readLine()) != null)
 result += line;
 inputStream.close();
 return result;
}

So the get the following error

Value {"Elec":"Cup1"} at 1 of type java.lang.String cannot be converted to JSONObject

Please help me

Thanks in advance

• bhumika rijiya: see my answer.....

Answer 1

This is the result after formatting your json in jsoneditoronline.org

enter image description here

Notice that the objects inside the 'Electronics' array are not JSONObject but String instead.

A simple workaround would be to get the object as a String first then parse it into a JSONObject like:

 // 10. convert inputstream to string
 if (inputStream != null) {
 result = convertInputStreamToString(inputStream);
 Log.d("JSONResponce", result);
 JSONObject jsonObj = new JSONObject(result);
 contacts = jsonObj.getJSONArray("Electronics");
 // Note contacts.length() NOT contacts.length() - 1
 for (int i = 1; i < contacts.length(); i++) {
 String cString = contacts.getString(i);
 JSONObject c = new JSONObject(cString);
 String id = c.getString("Print");
 Log.e("Errrrrrrr",""+id);
 }
 }

The best option would be however to correct the data returned from the server.

• LoadMore: what is c string inside for loop
• LoadMore: I have one ,more problem
• LoadMore: what should i do when there are more values in electronic
• efemoney: @LoadMore What do you mean by 'more values'. The code will still work because you're iterating through and accessing the array by index.

Answer 2

for (int i = 1; i < contacts.length()-1; i++)

to

for (int i = 0; i < contacts.length(); i++)

Answer 3

Instead calling getString or getJsonObject use jsonObject.get(key) and check the instance like below.

Object obj = jsonObject.get(key);
if(obj instanceof String) {
 // retrieve the string
} else if(obj instanceof JsonObject) {
 // retrieve the Json object
}

To get the values from JsonObject use jsonObject.optString or .optJsonObject, instead jsonObject.getString or .getJsonObject.

Answer 4

Try this,

 String response = "{\"Electronics\":[\"{\\\"Elec\\\":\\\"Cup0\\\"}\",\"{\\\"Elec\\\":\\\"Cup1\\\"}\",\"{\\\"Elec\\\":\\\"Cup2\\\"}\",\"{\\\"Elec\\\":\\\"Cup3\\\"}\",\"{\\\"Elec\\\":\\\"Cup4\\\"}\",\"{\\\"Elec\\\":\\\"Cup5\\\"}\",\"{\\\"Elec\\\":\\\"Cup6\\\"}\",\"{\\\"Elec\\\":\\\"Cup7\\\"}\",\"{\\\"Elec\\\":\\\"Cup8\\\"}\",\"{\\\"Elec\\\":\\\"Cup9\\\"}\"],\"Printable\":[\"{\\\"Print\\\":\\\"Mug0\\\"}\",\"{\\\"Print\\\":\\\"Mug1\\\"}\",\"{\\\"Print\\\":\\\"Mug2\\\"}\",\"{\\\"Print\\\":\\\"Mug3\\\"}\",\"{\\\"Print\\\":\\\"Mug4\\\"}\",\"{\\\"Print\\\":\\\"Mug5\\\"}\",\"{\\\"Print\\\":\\\"Mug6\\\"}\",\"{\\\"Print\\\":\\\"Mug7\\\"}\",\"{\\\"Print\\\":\\\"Mug8\\\"}\",\"{\\\"Print\\\":\\\"Mug9\\\"}\"]}";
 try {
 JSONObject jsonObj = new JSONObject(response);
 JSONArray Electronics = jsonObj.getJSONArray("Electronics");
 JSONArray Printable = jsonObj.getJSONArray("Printable");
 for (int i = 1; i < Electronics.length(); i++) {
 String cString = Electronics.getString(i);
 JSONObject c = new JSONObject(cString);
 String Elec = c.getString("Elec");
 Log.e("Elec", "" + Elec);
 }
 for (int i = 1; i < Printable.length(); i++) {
 String cString = Printable.getString(i);
 JSONObject c = new JSONObject(cString);
 String Print = c.getString("Print");
 System.out.println(" Print --> " + Print);
 }
 } catch (Exception e) {
 System.out.println(" time error --> " + e.toString());
 }

Logcat,

07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup1 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup2 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup3 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup4 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup5 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup6 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup7 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup8 07-23 01:48:12.808 8134-8134/com.example.peacock.abc E/Elec: Cup9 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug1 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug2 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug3 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug4 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug5 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug6 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug7 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug8 07-23 01:48:12.808 8134-8134/com.example.peacock.abc I/System.out: Print --> Mug9

I hope u solve your problem soon....