Develop Reference

JSONObject data send to JSONArray

JSONObject data = response.getJSONObject("data");
Iterator x = data.keys();
JSONArray jsonArray = new JSONArray();
while (x.hasNext()){
String key = (String) x.next();
jsonArray.put(data.get(key));
}
Log.d("TZX", String.valueOf(jsonArray));
I have JSONObject on variable data like this
{"type":"DISKON","result":"DUPE","data":{"1":{"Code":"DISC2","Description":"DISC SALES","Value":0},"2":{"Code":"DISC1.5%","Description":"DISC1.5%","Value":1.5},"3":{"Code":"DISC 2%","Description":"DISC 2%","Value":2}}}
How to i get Object "Value" on JSONObject for send to JSONArray on variable "jsonArray"
Sorry for my grammar and I'm newbie
谢谢

try this,
JSONObject data = response.getJSONObject("data");
JSONArray jsonArray = new JSONArray();
Iterator<?> keys = data.keys();
while (keys.hasNext()) {
String key = (String) keys.next();
if (data.get(key) instanceof JSONObject) {
jsonArray.put(((JSONObject) data.get(key)).getString("Value"));
}
}
Log.e("TZX", String.valueOf(jsonArray));

You are having array, so use JsonArray directly to parse data as in
JSONArray array = response.getJSONArray("data");
List<Integer> values = new ArrayList<>();
for(int i=0;i < array.length();i++){
values.add(array.getJSONObject(i).getInt("Value"));
}

You variable data is not JSONObject it's JSONArray.
data = [{"Code":"DISC2","Description":"DISC SALES","Value":0},{"Code":"DISC1.5%","Description":"DISC1.5%","Value":1.5},{"Code":"DISC 2%","Description":"DISC 2%","Value":2}]
To get JSONObject from array
JSONArray list = new JSONArray();
JSONObject obj = new JSONObject(data)
JSONArray jsonArray = new JSONArray(obj);
for(int i=0;i<json.length();i++){
JSONObject e = jsonArray.getJSONObject(i);
String value = e.getString("Value"));
list.put(value);
}

Trouble extracting values from JSON object in Java

Okay, I'm struggling here. I am getting the following JSON formated string from my php server (called "result") (edited! I was missing a curly brace at the end):
{"L1":[{"UserName":"User1","Avatar":"1"},{"UserName":"User2","Avatar":"2"},{"UserName":"User3","Avatar":"3"}],"L2":[{"UserName":"User4","Avatar":"4"},{"UserName":"User5","Avatar":"5"}]}
I'm trying to extract an ArrayList with the Avatar numbers from the L1 object(?). But I get an error
org.json.JSONException: Value
[{"UserName":"User1","Avatar":"1"},{"UserName":"User2","Avatar":"2"},{"UserName":"User3","Avatar":"3"}]
at L1 of type org.json.JSONArray cannot be converted to JSONObject
Here's my code:
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = new JSONArray(jsonObject.getJSONObject("L1"));
ArrayList<Integer> arrList = new ArrayList<>();
if (jsonArray != null) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject json = jsonArray.getJSONObject(i);
arrList.add(json.getInt("Avatar"));
AvatarList = arrList;
}
}
String query_result = "SUCCESS";
if (query_result.equals("FAILURE")) {
} else {
setAvatars(AvatarList);
}
} catch (JSONException e) {
Log.e("log_tag", "Error converting result "+e.toString());
}
If I use
jsonObject.getJSONArray("L1")
I get the same error.
Any suggestions?
Thanks in advance!
(edit: I made a mistake in the original post. There was a missing curly brace in the JSON string. Thanks to those who caught that)

Try the below one.Its working fine. I'm using json-simple-1.1.1 jar
String r="{\"L1\":[{\"UserName\":\"User1\",\"Avatar\":\"1\"},{\"UserName\":\"User2\",\"Avatar\":\"2\"},{\"UserName\":\"User3\",\"Avatar\":\"3\"}],\"L2\":[{\"UserName\":\"User4\",\"Avatar\":\"4\"},{\"UserName\":\"User5\",\"Avatar\":\"5\"}]}";
Object obj=JSONValue.parse(r);
JSONObject jsonObject = (JSONObject) obj;
JSONArray jsonArray = (JSONArray) jsonObject.get("L1");
ArrayList<Integer> arrList = new ArrayList<>();
if (jsonArray != null) {
for (int i = 0; i < jsonArray.size(); i++) {
JSONObject json = (JSONObject) jsonArray.get(i);
arrList.add((Integer.parseInt((String) json.get("Avatar"))));
AvatarList = arrList;
}
}
String query_result = "SUCCESS";
if (query_result.equals("FAILURE")) {
} else {
setAvatars(AvatarList);
}

This ended up working for me if anyone stumbles upon this. I don't really understand why this worked and my original method didn't... something to do with JSONObjects vs JSONArrays vs Strings and things like [, {, }, and ] probably.
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = new JSONArray(jsonObject.getString("L1"));
ArrayList<Integer> arrList = new ArrayList<>();
if (jsonArray != null) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject json = jsonArray.getJSONObject(i);
arrList.add(json.getInt("Avatar"));
AvatarList = arrList;
}
}

How to parse JSON array from file?

I have JSON from file.
{
"from_excel":[
{
"solution":"Fisrt",
"num":"1"
},
{
"solution":"Second",
"num":"2"
},
{
"solution":"third",
"num":"3"
},
{
"solution":"fourth",
"num":"4"
},
{
"solution":"fifth",
"num":"5"
}
]
}
and want to parse list of Solution and Num.
Used lib org.json.simple.*
Try this one
Object obj = parser.parse(new FileReader("E:\\json.txt"));
JSONObject jsonObject = (JSONObject) obj;
out.println(jsonObject.get("from_excel"));
JSONObject obj_new = (JSONObject) jsonObject.get("from_excel");
JSONArray solution = (JSONArray) obj_new.get("solution");
Iterator iterator = solution.iterator();
while (iterator.hasNext()) {
out.println(iterator.next());
}
What am I doing wrong?
If try to write
JSONObject solutions = (JSONArray) jsonObject.get("from_excel");
If try to write
JSONArray array = obj.getJSONArray("from_excel");
get error

working solution
JSONParser parser = new JSONParser();
JSONObject jsonObject;
try {
jsonObject = (JSONObject) parser.parse(new FileReader("E:\\json.txt"));
out.println("<br>"+jsonObject);
JSONArray from_excel = (JSONArray)jsonObject.get("from_excel");
// for row output 1
for(Object o: from_excel){
out.println("<br>"+o);
}
// for row output 2
Iterator iterator = from_excel.iterator();
while (iterator.hasNext()) {
out.println("<br>"+iterator.next());
}
// for item output 3
for (int i = 0; i < from_excel.size(); i++) {
JSONObject jsonObjectRow = (JSONObject) from_excel.get(i);
String num = (String) jsonObjectRow.get("num");
String solution = (String) jsonObjectRow.get("solution");
out.println("<br>num="+num+"; solution="+solution);
}
} catch (Exception e) {
out.println("Error: "+e);
}

There is no "solution" array in the JSON. "from_excel" is the array. So your code should look like this :
Object obj = parser.parse(new FileReader("E:\\json.txt"));
JSONObject jsonObject = (JSONObject) obj;
out.println(jsonObject.get("from_excel"));
JSONArray solutions = (JSONArray) jsonObject.get("from_excel");
Iterator iterator = solutions.iterator();
while (iterator.hasNext()) {
out.println(iterator.next());
}

from_excel is JSON array not an object. So you should achieve it is array.
JSONObject jsonObject = (JSONObject) obj;
JSONArray array = obj.getJSONArray("from_excel");
then iterate the array and get each jsonobject. Something like the below
for(int i = 0 ; i < array.length() ; i++){
array.getJSONObject(i).getString("solution");
}

Array inside JSONArray iteration in java

My Json is:
{
"Response": {
"Asset": [
{
"id": 2461,
"name": "TestAsset7771",
"model_name": "TestModel777",
"serial_number": "TestAsset7771",
"current_data": {
"timestamp": "",
"name": "Temperature",
"value": "?"
}
},
{
"id": 2448,
"model_id": 1229,
"name": "TestAsset777",
"model_name": "TestModel777",
"serial_number": "TestAsset777",
"current_data": {
"timestamp": "",
"name": "Temperature",
"value": "?"
}
}
]
}
}
My code is:
JSONObject outerObject = new JSONObject(jsonObj.toString());
JSONObject innerObject = outerObject.getJSONObject("Response");
JSONArray jsonArray = innerObject.getJSONArray("Asset");
for (int i = 0, size = jsonArray.length(); i < size; i++)
{
JSONObject objectInArray = jsonArray.getJSONObject(i);
String[] elementNames = JSONObject.getNames(objectInArray)
for (String elementName : elementNames)
{
String value = objectInArray.getString(elementName);
System.out.printf("name=%s, value=%s\n", elementName, value);
}
}
For inner array - ie current data, am getting values as:
name=current_data,
value={"timestamp":"","name":"Temperature","value":"?"}
How can i put another inner array so that i can get values of
"timestamp":"", "name":"Temperature", "value":"?" in separate variables instead of complete JSON

Its better to use Gson to parse JSON. Anyway, if you decide to follow as this is, try as :
You have a class like this:
class CurrentData{
String name,timestamp,value;
void print(){
System.out.printf("name=%s, timestamp=%s, value=%s\n", name,timestamp, value);
}
}
Now, change your for loop as follows:
for (String elementName : elementNames)
{
if(!elementName.equals("current_data")){
String value = objectInArray.getString(elementName);
System.out.printf("name=%s, value=%s\n", elementName, value);
}
else{
CurrentData obj=new CurrentData();// You can use array of objects declaring outside the loop as your need
JSONObject curr_object=objectInArray.getJSONObject("current_data");
obj.name=curr_object.getString("name");
obj.timestamp=curr_object.getString("timestamp");
obj.value=curr_object.getString("value");
obj.print();
}
}

for (String elementName : elementNames)
{
JSONObject jsonobject = jsonarray.getJSONObject(elementName);
System.out.printf( "name=%s, value=%s\n",jsonobject.getString("name"),jsonobject.getString("value"));
}

"value" is another jason object, so you can just call "getJasonObject()" to obtain the item and then proceed with that new array as normal.
Edit: I made a fail (not enough C0FFEE in my memory) and corrected thanks to the comment.

JSONObject outerObject = new JSONObject(jsonObj.toString());
JSONObject innerObject = outerObject.getJSONObject("Response");
JSONArray jsonArray = innerObject.getJSONArray("Asset");
for (int i = 0, size = jsonArray.length(); i < size; i++) {
JSONObject objectInArray = jsonArray.getJSONObject(i);
JSONObject currentData = objectInArray.getJSONObject("current_data");
if (currentData != null) {
String timestamp = currentData.getString("timestamp");
String name = currentData.getString("name");
String value = currentData.getString("value");
// Assign above results to array elements or whatever
}
}

//nested jsonarray
FileReader inp=new FileReader("xyz.json");
JSONParser parser=new JSONParser();
Object obj=parser.parse(inp);
JSONArray jsonArray=(JSONArray) obj;
int len=jsonArray.size();
for(i:len)
{
JSONArray json1=(JSONArray) jsonArray.get(i);
Iterato iterator=json1.iterator();
while(iterator.hasNext())
System.out.println(iterator.next());
}

Parsing JSON Array with JSON OBJECT

I have some JSON with the following structure:
{"cit": [
"ALL",
"Aceh Barat",
"Aceh Besar",
"Aceh Jaya",
"Aceh Selatan",
"Aceh Tengah",
"Aceh Timur",
"Aceh Utara"]}
i have try to parsing my json like this :
JSONObject jsonObject = new JSONObject(result);
JSONArray city=jsonObject.getJSONArray("cit");
for (int j=0; j < city.length(); j++){
JSONObject cit = city.getJSONObject(j);
String kot = cit.toString(j);
kota.add(kot);
}
on post execute :
ArrayAdapter<String> SpinnerKota = new ArrayAdapter<String>(Pencarian.this, android.R.layout.simple_list_item_1, kota);
spin_kota.setAdapter(SpinnerKota);
but nothing happen, is there any wrong with my code? i hope someone can help me to solve my problem.

"cit": [ // json array cit
"ALL", // index 0 is ALL
Also there is no json object inside json array cit. So you don't need this JSONObject cit = city.getJSONObject(j).
Change
String kot = cit.toString(j);
To
String kot = (String) city.get(j);
Use the below
JSONObject jsonObject = new JSONObject("myjson string");
JSONArray city=jsonObject.getJSONArray("cit");
for(int i=0;i<city.length();i++)
{
String cities = (String) city.get(i);
Log.i("All Cities",cities);
kota.add(cities);
}

Do it like this
JSONArray json = jParser.getJSONFromUrl(URL);
JSONObject c = json.getJSONObject(0);
JSONArray city = c.getJSONArray("cit");
for (int j=0; j < city.length(); j++){
String kot = cit.get(j);
kota.add(kot);
}

Object obj = yourJsonResult;
JSONObject jsonObject = (JSONObject) obj;
JSONArray msg = (JSONArray) jsonObject.get("cit");
Iterator<String> iterator = msg.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}

you can do it as following code this is tested
String jsonSource="{'cit': ['ALL','Aceh Barat','Aceh Besar','Aceh Jaya','Aceh Selatan','Aceh Tengah','Aceh Timur','Aceh Utara']}";
try {
JSONObject jsonObject=new JSONObject(jsonSource);
JSONArray jsonArray=jsonObject.getJSONArray("cit");
int length = jsonArray.length();
String [] cities = new String [length];
if (length > 0) {
for (int i = 0; i < length; i++) {
cities[i] = jsonArray.getString(i);
}
}
//to check we can print our string array
for (int i = 0; i < cities.length; i++) {
Log.d("JSON parsing ",cities[i]);
}
} catch (JSONException e) {
e.printStackTrace();
}