We Keep Coding

ArrayList of Strings to JSON

I have an ArrayList that contains values as follows
"One"
"Two"
"Three" etc.
I am trying to generate an JSON Object / Array out of this. My code is below:
peopleNames = personAdapter.getArrayListNames();
peoplePhones= personAdapter.getArrayListPhones();
JSONNames = new JSONObject();
JSONPhones = new JSONObject();
for (int i = 0; i < peopleNames.size(); i++){
try {
System.out.println(peopleNames.get(i));
JSONNames.put("Name",peopleNames.get(i));
} catch (JSONException e) {
e.printStackTrace();
}
}
for (int i = 0; i < peoplePhones.size(); i++){
try {
JSONPhones.put("Phone",peoplePhones.get(i));
} catch (JSONException e) {
e.printStackTrace();
}
}
jsonArrayNames = new JSONArray();
System.out.println(jsonArrayNames.toString());
However my output is just:
[{"Name":"One"}]

Why don't you merge the data ? I think, from your adapter, you're able to get people directly, right ? If so, I propose you the following :
people = personAdapter.getPersons();
JSONArray jsonArray = new JSONArray();
for (int i = 0; i < people.size(); i++) {
JSONObject object = new JSONObject();
object.put("Name", people.name());
object.put("Phone", people.phone());
jsonArray.put(object);
}
The resulted JSON will be :
[
{"Name":"One",
"Phone": "OnePhone"},
{"Name":"Two",
"Phone": "TwoPhone"},
]

Transform a JsonArray into an ArrayList

I have this json that i got using the YoutubeAPI :
{
"items": [
{
"id": {
"videoId": "ob1ogBV9_iE"
},
"snippet": {
"title": "13 estrellas ",
"description": "Pueden encontrar estas "
}
},
{
"id": {
"videoId": "o9vsXyrola4"
},
"snippet": {
"title": "Rayos Cósmicos ",
"description": "Este es un programa piloto "
}
}
]
}
i want to save the fiel "id" on an ArrayList but i have some problems this is the code im using:
JSONArray jsonArray = myResponse.getJSONArray("items");
In this line im creating an JSONarray with the JSONobject i created first
ArrayList<String> list = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
try {
JSONObject json = jsonArray.getJSONObject(i);
list.add(json.getString("videoID"));
} catch (JSONException e) {
e.printStackTrace();
}
}
My question is how can i access to this field? and how can i save it

You've got two main issues. The first is that "videoID" and "videoId" are not the same string. So you're checking for a key that doesn't exist.
Your second problem is that the "videoId" key doesn't exist in the top level object, it's inside the "id" object, so you need to drill down an extra layer to get it:
JSONArray jsonArray = myResponse.getJSONArray("items");
ArrayList<String> list = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
try {
JSONObject json = jsonArray.getJSONObject(i);
JSONObject id = json.getJSONObject("id");
list.add(id.getString("videoId"));
} catch (JSONException e) {
e.printStackTrace();
}
}
System.out.println(list); // [ob1ogBV9_iE, o9vsXyrola4]

Try with correct case for videoId, like
list.add(json.getString("videoId"));

JSON Error: I don't know what type of json file i have. Object or Array? "A JSONArray text must start with '[' at character 1"

This is my JSON file
{
"PartDetails": {
"MyPricing": [{
"BreakQuantity": 200,
"UnitPrice": 0.3787,
"TotalPrice": 75.74
}, {
"BreakQuantity": 600,
"UnitPrice": 0.2932,
"TotalPrice": 175.92
}, {
"BreakQuantity": 1000,
"UnitPrice": 0.2525,
"TotalPrice": 252.5
}, {
"BreakQuantity": 2600,
"UnitPrice": 0.25,
"TotalPrice": 650
}]
}
This is part of my java code. I am trying to pull out MyPricing. I am very new to JSON. Some help would be nice. I don't quite know the syntax that well yet. I have been watching some videos to this point to no avail.
JSONParser parser = new JSONParser();
try {
Object obj = parser.parse(new FileReader("C:/Users/Public/Documents/JSON/JSONFile.json"));
// String jsonString="";
JSONObject jsonObject = new JSONObject(obj.toString()).getJSONObject("PartDetails");
System.out.println(jsonObject);
JSONArray jsonArray = new JSONArray("MyPricing");
for (int i = 0; i < jsonArray .length(); i++) {
JSONObject _jObj = jsonArray.getJSONObject(i);
JSONObject _jObjTarget = _jObj.getJSONObject("target");
String _indicator_name = _jObjTarget.getString("indicator_name");
System.out.println("Indicator Name : " + _indicator_name);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}

JSONArray jsonArray = new JSONArray("MyPricing"); -creates a new json array out of the string "MyPricing" (the string is not an array so this fails)
try:
JSONArray jsonArray = jsonObject.getJSONArray("MyPricing"); - this takes the array that lies inside your object

Can't get value from JSON Data - YouTube API -

I'v try to get an value from a json data (YouTube V3 API).
String jsonText = readFromUrl(channerUrl);// channerUrl = Youtube V3 API Link
JSONObject json = new JSONObject(jsonText);
System.out.println(json.getString("videoId"));
But i have this in my log :
I/System.out: org.json.JSONException: No value for videoId
The data from YouTube is :
{
"kind": "youtube#playlistItemListResponse",
"etag": "\"xxxx"",
"nextPageToken": "xxx",
"pageInfo": {
"totalResults": 321,
"resultsPerPage": 1
},
"items": [
{
"kind": "youtube#playlistItem",
"etag": "\"xxxx"",
"id": "xxxx",
"contentDetails": {
"videoId": "The Value Want"
}
}
]
}
Why i have No value for videoId ?
Thank you
EDIT (didn't work too) : (jsonText) is the link of the JSON Data
JSONObject json = new JSONObject(jsonText);
List<String> list = new ArrayList<String>();
JSONArray array = json.getJSONArray("items");
for(int i = 0 ; i < array.length() ; i++){
list.add(array.getJSONObject(i).getString("contentDetails"));
System.out.println(json.getString("contentDetails"));
}

Because videoId is under items object.
Get item first then get its first child then fet the videoId
Edit: use
array.getJSONObject(i).getJSONObject("contentDetails").getString("videoId")
And remove the println line
Then outside the loop just print the list that contains the videoIds

use this code :
JSONObject json = new JSONObject(jsonText);
List<String> list = new ArrayList<String>();
JSONArray array = null;
try {
array = json.getJSONArray("items");
} catch (JSONException e) {
e.printStackTrace();
}
for(int i = 0 ; i < array.length() ; i++){
// list.add(array.getJSONObject(i).getString("contentDetails"));
try {
System.out.println(array.getJSONObject(i).getJSONObject("contentDetails").getString("videoId"));
} catch (JSONException e) {
e.printStackTrace();
}
}

try
{
JSONObject mJsonObject = new JSONObject(strValue);
JSONArray items = mJsonObject.getJSONArray("items");
String nextToken = mJsonObject.getString("nextPageToken").toString();
for(int i = 0;i<items.length();i++)
{
JSONObject snipetts = items.getJSONObject(i);
JSONObject snipet = snipetts.getJSONObject("snippet");
JSONObject thumbnails = snipet.getJSONObject("thumbnails");
JSONObject highImage = thumbnails .getJSONObject("high");
String title = snipet.get("title").toString();
String urlImage = highImage.get("url").toString();
String videoID = snipetts.getString("id");
String description = snipet.getString("description");
String publishDate = snipet.getString("publishedAt");
}
}
catch (Exception e)
{
e.printStackTrace();
}

Parsing JSON Not Showing out of range

I'm working on parsing JSON file in my java and the JSON file goes like this
{"System":[{"System1":{"DisplayName":"fabcd","InternalName":"AD","SystemCode":"0001","SystemName":"vnid"},"System2":{"DisplayName":"akdfkajfl","InternalName":"AD","SystemCode":"0001","SystemName":"kjdfkafdk"}}]}
I cannot access the all objects inside "System" array. Please help me on this. My code is this
Systems = jObj.getJSONArray("System");
Log.d("Array", Systems.toString());
JSONObject first = Systems.getJSONObject(0);
Log.d("CSystems",first.toString());
// looping through All Contacts
for(int i = 0; i <=Systems.length(); i++){
JSONObject c = Systems.getJSONObject(i);
Log.d("SubSystems", Systems.getString(0));
}
Thanks.

Shouldn't for loop be looping over first instead of Systems? (With changes to account for the fact it's an object, not an array.)

To parse
try
{
JSONObject jObj = new JSONObject("My Json string");
JSONArray jr = jObj.getJSONArray("System");
JSONObject jb= jr.getJSONObject(0);
JSONObject system1 = jb.getJSONObject("System1");
String name = system1.getString("DisplayName");
String internalname = system1.getString("InternalName");
String SystemCode = system1.getString("SystemCode");
String SystemName = system1.getString("SystemName");
JSONObject system2 = jb.getJSONObject("System2");
String name1= system2.getString("DisplayName");
String internalname1 = system2.getString("InternalName");
String SystemCode1 = system2.getString("SystemCode");
String SystemName1 = system2.getString("SystemName");
Log.i("..........",name+"..."+internalname+"..."+SystemCode+"..."+SystemName);
Log.i("..........",name1+"..."+internalname1+"..."+SystemCode1+"..."+SystemName1);
}catch(Exception e)
{
e.printStackTrace();
}
or
Same as above.
try
{
JSONObject jObj = new JSONObject("My json string");
JSONArray jr = jObj.getJSONArray("System");
for(int i = 0; i<jr.length(); i++){
JSONObject c = jr.getJSONObject(i);
for(int j = 1;j<3; j++){
JSONObject jb = c.getJSONObject("System"+(j));
Log.i("SubSystems", jb.getString("DisplayName"));
Log.i("SubSystems", jb.getString("InternalName"));
Log.i("SubSystems", jb.getString("SystemCode"));
Log.i("SubSystems", jb.getString("SystemName"));
}
}
}catch(Exception e)
{
e.printStackTrace();
}
or change your json to
{
"System": [
{
"DisplayName": "fabcd",
"InternalName": "AD",
"SystemCode": "0001",
"SystemName": "vnid"
},
{
"DisplayName": "akdfkajfl",
"InternalName": "AD",
"SystemCode": "0001",
"SystemName": "kjdfkafdk"
}
]
}
To parse. Changing json to above parsing is much more easier.
try
{
JSONObject jObj = new JSONObject("My json string);
JSONArray jr = jObj.getJSONArray("System");
for(int i = 0; i<jr.length(); i++){
JSONObject c = jr.getJSONObject(i);
Log.i("SubSystems", c.getString("DisplayName"));
Log.i("SubSystems", c.getString("InternalName"));
Log.i("SubSystems", c.getString("SystemCode"));
Log.i("SubSystems", c.getString("SystemName"));
}
}catch(Exception e)
{
e.printStackTrace();
}
You can also look at https://code.google.com/p/google-gson/