I'm trying to parse this JSON,
{
"listname": "red",
"lists": [
{
"id": "01",
"name": "paw",
"list": [
{
"id": "A",
"name": "pawa",
"bar": "foo"
},
{
"id": "B",
"name": "pawb",
"bar": "foo"
}
]
},
{
"id": "02",
"name": "pew",
"list": [
{
"id": "A",
"name": "pewa",
"bar": "foo"
},
{
"id": "B",
"name": "pewb",
"bar": "foo"
}
]
},
{
"id": "03",
"name": "piw",
"list": [
{
"id": "A",
"name": "piwa",
"bar": "foo"
},
{
"id": "B",
"name": "piwb",
"bar": "foo"
}
]
}
]
}
I put it on Asset Folder and I read it and it converts it to me to String since here all good, the problem is when I'm trying to get the name from each item of lists and trying to get all the names from the list I've tried it doing this :
JSONObject obj = new JSONObject(str);
JSONArray jsonMainArr = obj.getJSONArray("lists"); //first get the lists
for (int i = 0; i < jsonMainArr.length(); i++) {
JSONObject childJSONObject = jsonMainArr.getJSONObject(i);
String name = childJSONObject.getString("name");
Toast.makeText(context, name, Toast.LENGTH_SHORT).show();
}
JSONObject obj = new JSONObject(str);
JSONArray jsonMainArr = obj.getJSONArray("list"); //get the list
for (int i = 0; i < jsonMainArr.length(); i++) {
JSONObject childJSONObject = jsonMainArr.getJSONObject(i);
String name = childJSONObject.getString("name");
Toast.makeText(context, name, Toast.LENGTH_SHORT).show();
}
But it doesn't show anything... what I'm missing?
EDIT
This is how I read the JSON
public static String loadJSONFromAsset(Context ctx, String str) {
String json = null;
try {
InputStream is = ctx.getAssets().open(str);
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
Since your "list" is nested in the childJSONObject (from "lists") , nest your for loops to retrieve the this set of values (the JSONobject)
JSONObject obj = new JSONObject(str);
//first get the top-level "lists"
JSONArray jsonMainArr = obj.getJSONArray("lists");
for (int i = 0; i < jsonMainArr.length(); i++) {
JSONObject childJSONObject = jsonMainArr.getJSONObject(i);
String name = childJSONObject.getString("name");
Toast.makeText(context, name, Toast.LENGTH_SHORT).show();
//get the inner "list" from childJSONObject
JSONArray childJSONArray = childJSONObject.getJSONArray("list");
for (int j = 0; j < childJSONArray.length(); j++) {
JSONObject childJSONObjectB = childJSONArray.getJSONObject(j);
String name = childJSONObjectB.getString("name");
Toast.makeText(context, name, Toast.LENGTH_SHORT).show();
}
}
Related
How I can get only the "name" string of every object under "fields" Array, of main Array index at 0 & then next index using loop or with something super idea
[
{
"name": "Bank1",
"fields": [
{
"name": "Email",
"slug": "email",
"type": "input"
},
{
"name": "City",
"slug": "city",
"type": "input"
},
{
"name": "Screenshot",
"slug": "screenshot",
"type": "file"
},
{
"name": "Full Name",
"slug": "full-name",
"type": "input"
}
],
"status": "Active"
},
{
"name": "Bank2",
"fields": [
{
"name": "Email",
"slug": "email",
"type": "input"
},
{
"name": "City",
"slug": "city",
"type": "input"
},
{
"name": "Screenshot",
"slug": "screenshot",
"type": "file"
},
{
"name": "Submitted Date",
"slug": "submitted-date",
"type": "calendar"
}
],
"status": "Active"
}
]
Output I want:
Email
City
Screenshot
Full Name
Means in the output, I have got index 0, first object array data...
What I have done yet
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String p_name = jsonObject.getString("name");
ArrayList<String> arr = new ArrayList<>();
JSONArray ja = jsonObject.getJSONArray("fields");
int len = ja.length();
for (int j = 0; j < len; j++) {
JSONObject json = ja.getJSONObject(j);
arr.add(json.getString("name"));
}
}}catch block...
this gives me all indexes name data i want only specific index data
My Current Output:
Email
City
Screenshot
Full Name
Email
City
Screenshot
Submitted Date
If you want to get specific index data then you should pass if condition in for loop.
EX: to get output of index 0 like,
Email
City
Screenshot
Full Name
Your code would be like below.
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
for (int i = 0; i < jsonArray.length(); i++) {
if(i==0){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String p_name = jsonObject.getString("name");
ArrayList<String> arr = new ArrayList<>();
JSONArray ja = jsonObject.getJSONArray("fields");
int len = ja.length();
for (int j = 0; j < len; j++) {
JSONObject json = ja.getJSONObject(j);
arr.add(json.getString("name"));
}
}
}}catch block...
int i=gotIndex;//here you can give your exact index that you want
JSONObject jsonObject = jsonArray.getJSONObject(i);
String p_name = jsonObject.getString("name");
ArrayList<String> arr = new ArrayList<>();
JSONArray ja = jsonObject.getJSONArray("fields");
int len = ja.length();
for (int j = 0; j < len; j++) {
JSONObject json = ja.getJSONObject(j);
arr.add(json.getString("name"));
}
here you used the loop you can use the json object out side the loop with using the index number i (jsonObject = jsonArray.getJSONObject(i))
Hi All I am trying to parse a JSON String that contains a multidimensional array. I keep getting the following error in the logs -> W/System.err: org.json.JSONException: No value for nutrients and this error corresponds to the following line -> JSONArray jsonArray1 = jsonObject.getJSONArray("nutrients");
Can someone please help me with this issue. thanks in advance
The JSON String I am trying to parse ->
{
"results": [
{
"id": 654959,
"title": "Pasta With Tuna",
"image": "https://spoonacular.com/recipeImages/654959-312x231.jpg",
"imageType": "jpg",
"nutrition": {
"nutrients": [
{
"title": "Calories",
"amount": 420.823,
"unit": "kcal"
},
{
"title": "Protein",
"amount": 24.4751,
"unit": "g"
},
{
"title": "Fat",
"amount": 10.3277,
"unit": "g"
},
{
"title": "Carbohydrates",
"amount": 57.6915,
"unit": "g"
}
]
}
}
My Java code to parse it ->
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.getJSONArray("results");
for (int i = 0; i < jsonArray.length(); i++) {
int id = jsonArray.getJSONObject(i).getInt("id");
String title = jsonArray.getJSONObject(i).getString("title");
String image = jsonArray.getJSONObject(i).getString("image");
Log.i("a", "" + title);
JSONArray jsonArray1 = jsonObject.getJSONArray("nutrients");
for(int e = 0; e < jsonArray1.length(); e++) {
JSONObject jsonObject1 = jsonArray1.getJSONObject(e);
double calories = jsonObject1.getDouble("amount");
Log.i("calories", "" + calories);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
Your JSON is invalid.
Here is a valid one
{
"results": [
{
"id": 654959,
"title": "Pasta With Tuna",
"image": "https://spoonacular.com/recipeImages/654959-312x231.jpg",
"imageType": "jpg",
"nutrition": {
"nutrients": [
{
"title": "Calories",
"amount": 420.823,
"unit": "kcal"
},
{
"title": "Protein",
"amount": 24.4751,
"unit": "g"
},
{
"title": "Fat",
"amount": 10.3277,
"unit": "g"
},
{
"title": "Carbohydrates",
"amount": 57.6915,
"unit": "g"
}
]
}
}
]
}
Then your Java code
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.getJSONArray("results");
JSONObject resultsObject=jsonArray.getJSONObject(0);
int id = resultsObject.getInt("id");
String title = resultsObject.getString("title");
String image =resultsObject.getString("image");
Log.i("a", "" + title);
JSONObject nutrition = resultsObject.getJSONObject("nutrition");
JSONArray nutrients = nutrition.getJSONArray("nutrients");
for(int e = 0; e < nutrients.length(); e++) {
JSONObject jsonObject1 = nutrients.getJSONObject(e);
double calories = jsonObject1.getDouble("amount");
Log.i("calories", "" + calories);
}
} catch (JSONException e) {
e.printStackTrace();
}
Hope Helpful!
I am new to android and json. I want to implement some logic where i can get the data from sub1 from json inside json inside another json.
Is there any way to get that data?
This is how my json file looks like.
{
"Aeronautical": [],
"Automobile": [],
"Civil": [],
"Computer": [
{
"sub1": [
{
"id": "1",
"name": "name1",
"year": "2019",
"url": "some_url"
},
{
"id": "2",
"name": "Name 2",
"year": "2018",
"url": "some url"
},
{
"id": "3",
"name": "Name 4",
"year": "2018",
"url": "some url"
}
]
}
]
}
sub1 is inside another array , so first you should get data from computer array
JSONObject obj = null;
try {
obj = new JSONObject(json);
JSONArray arr = obj.getJSONArray("Computer");
for (int i = 0; i < arr.length(); i++)
{
JSONObject obj_computers = arr.getJSONObject(i);
JSONArray sub1 = obj_computers.getJSONArray("sub1");
for (int j = 0; j < sub1 .length(); j++)
{
JSONObject sub1_data = sub1.getJSONObject(j);
Log.i("test" ,sub1_data.toString());
}
}
} catch (JSONException e) {
e.printStackTrace();
}
The Android SDK includes the org.json lib. You can use the JSONObject class.
String jsonString = /* obtain some JSON however you need to*/;
JSONObject root = new JSONObject(jsonString);
JSONObject sub1 = root.getJSONObject("sub1");
I omitted exception handling, but this is the basic idea.
I have the below following type of json structure which is coming from url.
[{
"id": 1,
"name": "TV",
"fromcenter": {
"car": "60 Mins",
"bus": "20 Mins"
},
"location": {
"latitude": -33.7181,
"longitude": 10.3160
}
}, {
"id": 2,
"name": "Fridge",
"fromcenter": {
"car": "30 Mins"
},
"location": {
"latitude": -33.8433,
"longitude": 11.2411
}
}, {
"id": 3,
"name": "Mixie",
"fromcenter": {
"car": "20 Mins",
"bus": "40 Mins"
},
"location": {
"latitude": -3.8910,
"longitude": 11.27777
}
}]
I am able to parse everything except the "bus" because the bus is not available in id 2. So I am getting error as value "bus" not found. JSONException.
Let me know how to solve this? Below is what I tried.
try {
JSONArray array = new JSONArray(response);
goodModelArrayList = new ArrayList<>();
for (int i = 0; i < array.length(); i++) {
JSONObject e = array.getJSONObject(i);
spinnerModel = new MyTransport();
fromcenter = new Fromcenter();
location = new Location();
for (int j = 0; j < e.length(); j++) {
JSONObject object = e.getJSONObject("location");
latitude = object.getString("latitude");
longitude = object.getString("longitude");
}
for (int k = 0; k < e.length(); k++) {
JSONObject object = e.getJSONObject("fromcenter");
car = object.getString("car");
//bus = object.getString("bus"); //I am not able to get the bus. It throws JSONException error.
}
spinnerModel.setId(String.valueOf(e.getString("id")));
spinnerModel.setName(e.getString("name"));
spinnerModel.setFromcenter(car);
//spinnerModel.setBus(bus); //I am not able to store the datas.
spinnerModel.setLocation(latitude);
spinnerModel.setLocations(longitude);
goodModelArrayList.add(spinnerModel);
}
} catch (Exception e) {
e.printStackTrace();
}
you can interrogate if the object has the property before reading it
if (object.has("bus")) {
bus = object.getString("bus");
}
Straight forward one word.
Use optString instead of getString
optString eliminates this issue. Bus is not present in 2nd item.
So use
String bus= object.optString("bus");
I have a JSONArray contained in another JSONArray in a JSON Object like the following:
{
"protocol": "test",
"query": [
{
"locked": false,
"ids": [
{
"id": 1,
"locked": false
},
{
"id": 1,
"locked": false
}
]
},
{
"locked": false,
"ids": [
{
"id": 1,
"locked": false
},
{
"id": 1,
"locked": false
}
]
}
],
}
here i want to get the ids arrays, i can get the query arrays like that:
private JSONArray getDB_Query(String json) throws JSONException{
JSONObject jsonObj = null;
try {
jsonObj = new JSONObject(json);
} catch (JSONException e) {
Login.errorMessage.setText(sys_err);
}
JSONArray query = jsonObj.getJSONArray("query");
return query;
}
Now if I want to get the ids, is that true :
jsonObj = new JSONObject(query.toString()); // query is the JSONArray I retrieved from the above method
for(int i= 0; i < query.length(); i ++){
JSONArray ids_query = jsonObj.getJSONArray("ids");
}
update your last for loop like:
for(int i= 0; i < query.length(); i ++){
JSONArray ids_query = query.getJSONObject(i).getJSONArray("ids");
}