Develop Reference

Gson - is it possible int fields in quote (") when create json from object?

I am using gson lib to create json from objects. Backend developers are asking to create all values should be in "" quotes event int/long/boolean fields. For example my json looks like that:
{
"age": 26,
"email": "norman#futurestud.io",
"isDeveloper": true,
"name": "Norman"
}
-> i need the following format:
{
"age": "26",
"email": "norman#futurestud.io",
"isDeveloper": "true",
"name": "Norman"
}
Should i change all my fields from int to String or is there any way to do that? Thanks in advance!

To achieve this only way is to store Int as String and then converting the Data class to json String.As Gson use auto typecasting, you can't tell Gson to convert int to String and give you json.
Create the POJO according to your output json that is the only go.

Your code is JavaScript object literal, not a JSON.
Well try this out!
var obj = {"age": 26,"email": "norman#futurestud.io", "isDeveloper":
true, "name":
"Norman"};
for (var k in obj) {
if (obj.hasOwnProperty(k))
{
obj[k] = String(obj[k]);
}
}

Firebase add item to array dynamically

I am trying to make some kind of comments using Firebase for Android.
Just have one question, are there any way to add new items to array?
For example, if I have such kind of object
If I am trying to push, it will convert it to map
And I don't want to overwrite this object each time, because I will have multiuser support and it will fail at some point.
And I am trying to do it as a List to do not create DataTransferObjects for my models, and to support auto parsing using firebase.
Thanks! If there will be no ideas will go with creating Maps, actually.
My ObjectModel:
public class Company implements Parcelable {
private String id;
private String name;
private String description;
private List<Comment> comments;
}
Code for pushing item:
final DatabaseReference ref = companiesRef.child(companyId).child(NODE_COMMENTS).push();
return Single.create(e -> ref.setValue(comment)
.addOnCompleteListener(task -> {
e.onSuccess(task.isSuccessful());
}));

This is how it works, look at the example below I have stored "0" as my first commentID and "1" as my second commentID. As you can see, I stored the lastCommentID as the commentID for the last comment in the lists.
{
"comments": {
"0": {
"text": "mycomment",
"time": "142351516"
},
"1": {
"text": "secondcomment",
"time": "153426564"
}
}
"lastCommentId": "1"
}
So whenever you want to add new comment to the firebase you have to retrieve the lastCommentID first as a string and convert it to integer(E.g. 1) then add 1 to the value(E.g. 2) so that when you save the next comment it won't override the previous version.
Note that you have replace lastCommentID each time you add comment to the database.
{
"comments": {
"0": {
"text": "mycomment",
"time": "142351516"
},
"1": {
"text": "secondcomment",
"time": "153426564"
},
"2": {
"text": "thirdcomment",
"time": "153426564"
}
}
"lastCommentId": "2"
}

You do not need to have a Model Class to write in Firebase, you can parse a JSON to Java Objects dinamically with Jackson and push it into Firebase.
You can parse a JSON as Java Objects with Jackson
. For example you can obtain: Object, List, Hashmap, Integer, String,
etc. without POJO classes.
To see more please visit this answer

Retrofit response parsing suggestion

I am parsing the JSON response in retrofit model classes.
My issue is that the response is not constant means some time it will come with 2 params and some time more than that,
exp:
1st response:
{
"error": true,
"data": {
"order_id": [
"Order Id does not exists"
]
},
"code": 500
}
2nd response :
{
"error": false,
"data": [
"Order #P have sent successfully"
],
"code": 200
}
So in first response if the order id is not there than in response i will get order_id as a key but in 2nd response I will not get because it is success.
*** I can solve this issue by asking the back end guy to change the response but if in case, any other prefixed api response, if I will get this kind of result then how will I handle that??

You can use model class like this :
public class ResponseModel {
private boolean error;
private int code;
private JsonElement data;
// Setters, getters, etc. ...
}
Then you can check for error and code value and handle data object in the way you like. Both cases you mention will work with this model.
You can even serialize this data variable to some another model class when you will know what data you have inside.

For this case you should write custom Deserializer and check if data is array or jsonobject.
IMHO in general the idea of using same key for holding error info and non-error info is bad.

(Android) Java: JSON Parsing

I found a lot of tutorials here, how to parse JSON Data of an JSON Array.
But my JSON File is a little bit complicate (for me). It has the following structure:
JSON File (excerpt)
{
"data": {
"schedule_id": {
"12": {
"name": "CP",
"d_id": [
"7"
]
},
"17": {
"name": "WT",
"d_id": [
"88",
"14"
]
}
}
}
}
Java Code (excerpt)
Info: I've parsed the json into "json" using HTTP GET in another Activity.
JSONObject dataJsonData = json.getJSONObject("data").getJSONObject("schedule_id");
Now I would parse through the ids using a "for"-loop:
ArrayList<String> parsedNameList = new ArrayList<String>();
for (int i = 0; i < idontknow; i++) {
String s = new Integer(i).toString();
parsedNameList.add(dateJsonData.getJSONObject(i).getString("name"));
}
This would add each value of "name" to the ArrayList.
But there are 2 problems:
1. The "schedule_id"s are messed up and incomplete. For example, there is no id "0" and, like in given json, the ids "13, 14, 15, 16" are missing.
2. The "schedule_id"s will be changed every day and will be mixed.
So I don't think, that I can use the predefined integer "i" because some integers aren't a "schedule_id". I could use this loop and would ignore empty entries in the ArrayList, but the JSON contains more than 200 ids - I think it would be more efficient, if there is another way to parse through this json.
I found some informations of the getJSONArray method, but the "d_id"s are Arrays - not the "schedule_ids".
Does anyone has an idea? Is there maybe a placeholder for the parameter of the getString method?
PS: Excuse my english, I'm from germany :)

I think this should work
Iterator keys = dataJsonData.keys();
while(keys.hasNext()) {
// loop to get the dynamic key
String currentDynamicKey = (String)keys.next();
// get the value of the dynamic key
String currentDynamicValue = dataJsonData .getString(currentDynamicKey);
parsedJsonList.add(currentDynamicValue );
}
Source: How to parse a dynamic JSON key in a Nested JSON result?

According to your context, it is better to change the json structure,if you have access to web service.
Request for json structure to be like this,
{
"data":{
"schedule":[
{
"id":12,
"name":"CP",
"d_id":[
"7"
]
},
{
"id":12,
"name":"CP",
"d_id":[
"7",
"88"
]
},
{
"id":200,
"name":"AT",
"d_id":[
"7",
"88"
]
}
]
}
}
Otherwise too much iteration can slow down you CPU.

Parsing json file with gson

I have a problem creating a mapping for a json that i want to parse using json. It's very specific, its about a json file with a json array with objects in it.
my jsonfile starts like this:
[
{
"venue": {
"venue_seasons": [
{
"created_at": "2011-12-25T23:00:28Z",
"updated_at": "2011-12-28T15:13:53Z",
"start_timestamp": 1293840000,
"id": 337,
"end": "2011-12-24T00:00:00Z",
"enabled": true,
"start": "2011-01-01T00:00:00Z",
"season_openings": [ … ],
"end_timestamp": 1324684800
},
{ … }
],
"address": "someadress",
"city": "cityname",
"name": "name",
"created_at": "2011-03-31T07:55:33Z",
etcetera
}
"venue":{another venue
So first an array, than an object (venue) with a lot of objects in it (i removed most of them, because thats not important for my question), and some arrays (like season_openings).
My parsing code works like this, im using gson. The inputstream works fine.
Reader reader = new InputStreamReader(inputStream);
JsonResponse venueResponse = gson.fromJson(reader, JsonResponse.class);
List<Venues> results = venueResponse.venue;
with the class JsonResponse:
public class JsonResponse {
public List<Venues> venue;
}
and Venues.class:
public class Venues {
public List<VenueSeasons> venue_seasons;
#SerializedName("adress")
public String getAdress;
#SerializedName("city")
public String getCity;
#SerializedName("country")
public String getCountry; etcetera
}
But when i run this code i get an error:
Unable to start activity ComponentInfo{com.hera.android.JSON/com.hera.android.JSON.TestParser2Activity}: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2
Ofcourse i can read the error: it expects an objects but get an array. I varied a lot with different jsonresponse.class and even with putting the whole json array in a json object (what is not really a solution because i need to work with this type of jsonfile). But everytime i get this or a similar error.
I think I'm close to a solution, can anyone see what i just can't and give me a helping hand?
Thanks.

Try calling Gson like this:
List<Venues> venues = gson.fromJson(reader, new TypeToken<List<Venues>>() {}.getType());
This works because your JSON document is a List, not an object that has a list as one of its properties.