Develop Reference

get Json Object encased in another Json

i'm stuck with a JSon problem, i'm trying to get a value contained in a JSon Object witch is itself Contained in another JSon Object. The returned JSon is like this " {"id":25,"name":"aaaaaaaa:eeeeegh","dishes_number":2,"description":"tttttttttttttf","country":{"code":"FR","name":"France"},"type":{"id":2,"name":"Main course"}} "
and i want to get the value od code in Country and the id in Type
here's my code
try{
JSONArray json = new JSONArray(sb.toString());
Courses coun;
for(int i=0; i < json.length(); i++) {
JSONObject jsonObject = json.getJSONObject(i);
coun = new Courses();
// Log.i(TAG, "Nom Pays : " + jsonObject.get("name"))
coun.setName((String) jsonObject.get("name"));
coun.setId((int) jsonObject.get("id"));
coun.setCountryCode((String) jsonObject.get("code"));
coun.setDescription((String) jsonObject.get("description"));
/* coun.setCourseTypeId((int) jsonObject.get("code"));
coun.setDishesNumber((int) jsonObject.get("code")); */
repas.add(coun);
}
}catch (JSONException je){
je.printStackTrace();
};
it give me the answer " org.json.JSONException: No value for code " when i run the app
Thanks you for your help

try{
JSONArray json = new JSONArray(sb.toString());
Courses coun;
for(int i=0; i < json.length(); i++) {
JSONObject jsonObject = json.getJSONObject(i);
coun = new Courses();
// Log.i(TAG, "Nom Pays : " + jsonObject.get("name"))
coun.setName((String) jsonObject.get("name"));
coun.setId((int) jsonObject.get("id"));
//get des country
JSONObject country = jsonObject.getJSONObject("country");
//get code and other informations of country
coun.setCountryCode(country.getString("code"));
coun.setDescription((String) jsonObject.get("description"));
/* coun.setCourseTypeId((int) jsonObject.get("code"));
coun.setDishesNumber((int) jsonObject.get("code")); */
repas.add(coun);
}
}catch (JSONException je){
je.printStackTrace();
};

Code field is nested in the country, so you need to get country first:
((JSONObject)jsonObject.get("country")).get("code")
The same way you can get type and nested id field from it.
P.S. Me test code:
public static void main(String[] args) {
String jsonStr = "[{\"id\":25,\"name\":\"aaaaaaaa:eeeeegh\",\"dishes_number\":2,\"description\":\"tttttttttttttf\",\"country\":{\"code\":\"FR\",\"name\":\"France\"},\"type\":{\"id\":2,\"name\":\"Main course\"}}]";
try {
JSONArray json = new JSONArray(jsonStr);
for (int i = 0; i < json.length(); i++) {
JSONObject jsonObject = json.getJSONObject(i);
System.out.println(((JSONObject)jsonObject.get("country")).get("code"));
}
} catch (JSONException je) {
je.printStackTrace();
}
}
Output:
FR

Parsing another JSON Format

So here's the following code :
jObj = new JSONObject(valeurARenvoyer);
hauteur = jObj.getString("niveauEau");
debit = jObj.getString("debit");
date = jObj.getString("dateReleve");
batterie = jObj.getString("chargeBatterie");
presence = jObj.getString("etatPerimetrique");
bat = jObj.getString("chargeBatterie");
So i used this code to parse a JSON which was like that :
{"id":"15","id_Station":"Artiguelouve","Date_Releve":"2017-02-16 16:07:41","Niveau_Eau":"29","Charge_Batterie":"9","Etat_Perimetrique":"0","Debit":"13.35"}
It worked well, but now my JSON response looks like that :
{"Station":"Artiguelouve","debit":[{"niveauEau":0,"debit":32.5,"dateReleve":{"date":"2017-06-08 15:59:03","timezone_type":3,"timezone":"Europe\/Paris"},"idStation":"Artiguelouve","etatPerimetrique":true,"chargeBatterie":14590}]}
With this response i can't find how to parse this.
valeurARenvoyer is my JSON. Can you have any solution to do that please ?

add this code to get response
JSONObject jsonObject = new JSONObject(jsonResponse);//put your json response
JSONArray jsonArray = null;
try {
String station = jsonObject.getString("Station");
jsonArray = jsonObject.getJSONArray("debit");
for(int i=0;i<jsonArray.length();i++)
{
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
int niveauEau = jsonObject1.getInt("niveauEau");
int debit = jsonObject1.getInt("debit");
String isStation = jsonObject1.getString("idStation");
boolean etatPerimetrique = jsonObject1.getBoolean("etatPerimetrique");
int chargeBatterie = jsonObject1.getInt("chargeBatterie");
JSONObject jsonObject2 = jsonObject1.getJSONObject("dateReleve");
String date = jsonObject2.getString("date");
int timezone_type = jsonObject2.getInt("timezone_type");
String timezone = jsonObject2.getString("timezone");
}
} catch (JSONException e) {
e.printStackTrace();
}

try this code
try {
JSONObject jsonObject = new JSONObject(valeurARenvoyer);
JSONArray jsonArray = jsonObject.getJSONArray("debit");
for(int i = 0; i < jsonArray.length(); i++){
// you can get niveauEau, debit, idStation, etatPerimetrique,
// chargeBatterie, dateReleve JsonObject values in this loop
}
} catch (JSONException e) {
e.printStackTrace();
}

Creating an ArrayList from a JSON Object

So I have a JSON just like the picture below stored as MYJSON--
My plan is to retrieve all the object from childObject0 and store them in an ArrayList so they can be processed later. So I did-
ArrayList<String> childLists = new ArrayList<String>();
try {
JSONArray childArray = MYJSON.getJSONArray("childObject0");
for (int i = 0; i<jArray.length(); i++
) {
//I lost it here! How can I append to `childList` from `childArray`?
}
} catch (JSONException e) {
e.printStackTrace();
}
Can't figure out how to append. Is this right approach? childObject0 is dynamic and the count changes time to time.
Thanks

Since each object in childObject0 is json, you can store it as an ArrayList<JSONObject>. That should make the objects easier to process than as Strings.
ArrayList<JSONObject> childList = new ArrayList<JSONObject>();
try {
JSONArray childArray = MYJSON.getJSONArray("childObject0");
for (int i = 0; i < childArray.length(); i++) {
childList.add(childArray.getJSONObject(i));
}
} catch (JSONException e) {
e.printStackTrace();
}

Android, cannot iterate through JSONArray inside for-loop

I'm trying the following to iterate through each JSONObject in an JSONArray but it's not working. I check the length of the JSONArray in the Log and it gives me the correct lenght, but I can't get the JSONObject at each element of the JSONArray. Also, each element should be a JSONObject with 8 key/value pairs. Any feedback is greatly appreciated, thanks.
if (getMyJSONArray() != null) {
newJSONArray = getMyJSONArray();
try {
// Did this because the JSONArray was inside a JSONArray
innerJSONArray = newJSONArray.getJSONArray(0);
} catch (JSONException e) {
e.printStackTrace();
}
if (innerJSONArray != null) {
// This gives me the right length
Log.i("innerJSONArray.length: ", String.valueOf(innerJSONArray.length()));
for (int i = 0; innerJSONArray.length() < 0; i++) {
try {
// This doesn't work
JSONObject jsonObject1 = innerJSONArray.getJSONObject(i);
// This doesn't work either
JSONObject jsonObject2 = new JSONObject(innerJSONArray.getString(i));
…(more code below to use if the part above works)
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}

In your for loop innerJSONArray.length() < 0; should be i < innerJSONArray.length().
Then this line should work as expected:
JSONObject jsonObject1 = innerJSONArray.getJSONObject(i);

Using Java to decode JSON array of objects

I have JSON as follows:
[{"0":"1","id":"1","1":"abc","name":"abc"},{"0":"2","id":"2","1":"xyz","name":"xyz"}]
It is an array of objects.
I need to parse it using Java. I am using the library at :
http://code.google.com/p/json-simple/downloads/list
Example 1 at this link approximates what I require:
http://code.google.com/p/json-simple/wiki/DecodingExamples
I have the following code:
/** Decode JSON */
// Assuming the JSON string is stored in jsonResult (String)
Object obj = JSONValue.parse(jsonResult);
JSONArray array = (JSONArray)obj;
JSONObject jsonObj = null;
for (int i=0;i<array.length();i++){
try {
jsonObj = (JSONObject) array.get(i);
} catch (JSONException e) {
e.printStackTrace();
}
try {
Log.d(TAG,"Object no." + (i+1) + " field1: " + jsonObj.get("0") + " field2: " + jsonObj.get("1"));
} catch (JSONException e) {
e.printStackTrace();
}
}
I am getting the following exception:
java.lang.ClassCastException: org.json.simple.JSONArray
// at JSONArray array = (JSONArray)obj;
Can someone please help?
Thanks.

Instead of casting your Object to JSONArray, you should do it like this:
JSONArray mJsonArray = new JSONArray(jsonString);
JSONObject mJsonObject = new JSONObject();
for (int i = 0; i < mJsonArray.length(); i++) {
mJsonObject = mJsonArray.getJSONObject(i);
mJsonObject.getString("0");
mJsonObject.getString("id");
mJsonObject.getString("1");
mJsonObject.getString("name");
}