Develop Reference

Store key-less JSON to Realm using Retrofit

I want to save the following JSON from an online API directly to Realm using Retrofit. I am struggling to define the model because there are no keys and the values are dynamic.
JSON:
{
"Plants": {
"Green": [
"Ascia",
"Musca Arabica"
...
],
"Yellow": [
"Campona",
"Zirata",
...
],
...
}
}
Is this even doable? I know I can use a Map<String, Map<String, Set<String>>>, but makeing the Realm model is causing me trouble.

You could flatten it completely.
public class Data extends RealmObject {
#PrimaryKey
private String typeCategoryName; // "Plants_Green_Ascia"
#Index
private String type; // "Plants"
#Index
private String category; // "Green"
private String name; // "Ascia"
}
Then you could query it like
RealmResults<Data> data = realm.where(Data.class)
.equalTo("type", "Plants")
.equalTo("category", "Green")
.findAll();

How to parse inner JSON using GSON builder

My JSON like this:-
{
"status": "approved",
"work_flow": {
"id": 27,
"name": "xgfdhx",
"role": "xfhxfhg",
"user_image": null
}
}
And my GsonCode is this:-
EmployeeDTO eDTO = gson.fromJson(json, eDTO.class);
so
Log.d(TAG,"Response: "+eDTO.getStatus())-----o/p:- Approved
means I am successfully get the status but I had problem to iterate the inner JSON,
Can someone explain me or help me how to get the work_flow inner JSON data.
using GSON builder?

Try
1. Change this line EmployeeDTO eDTO = gson.fromJson(json, eDTO.class); to
EmployeeDTO eDTO = gson.fromJson(json, EmployeeDTO.class);
2. Add class EmployeeDTO.java
public class EmployeeDTO {
String status;
#SerializedName("work_flow")
WorkFlow workFlow;
}
3. Add class WorkFlow.java
public class WorkFlow {
int id;
String name;
String role;
String userImage;
}

Retrofit List of object assigns null to data

This is how my JSON response looks
[
{
"id": 1,
"PhName": "sample string 2",
"Longitude": 3.1,
"Latitude": 4.1,
"ApplicationUserId": "sample string 5"
},
{
"id": 1,
"PhName": "sample string 2",
"Longitude": 3.1,
"Latitude": 4.1,
"ApplicationUserId": "sample string 5"
}
]
this is my retrofit interface call
#GET("/api/GPS")
#Headers({
"Accept: application/json"
})
Call<List<UserResponse>> search(#Query("search") String search,
#Header("Authorization") String auth);
Pojo Class
public class UserResponse {
#SerializedName("Id")
int id;
#SerializedName("UserName")
String phName;
#SerializedName("Longitude")
int lon;
#SerializedName("Latitude")
int lat;
#SerializedName("ApplicationUserId")
String appUserId;
//getters and setters
}
Retrofit declaration
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(PerformLogin.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
Getting data and using it
MyApiEndpointInterface apiService =
retrofit.create(MyApiEndpointInterface.class);
Call<List<UserResponse>> call = apiService.search(query,"Bearer "+token);
call.enqueue(new Callback<List<UserResponse>>() {
#Override
public void onResponse(Call<List<UserResponse>> call, Response<List<UserResponse>> response) {
List<UserResponse> userList = response.body();
Log.w("My App", response.message());
for (int i = 0; i <userList.size() ; i++) {
Log.w("My App", userList.get(i).getPhName()+""+i);
}
//mAdapter = new MyAdapter(getContext(),userList);
//mRecyclerView.setAdapter(mAdapter);
}
#Override
public void onFailure(Call<List<UserResponse>> call, Throwable t) {
Log.w("My App", t.getMessage());
}
});
my response
W/My App: OK
W/My App: null 0
W/My App: null 1
W/My App: null 2
W/My App: null 3
In this case I am suppose to receive four result from the search and the names are giving me null.
Is there anything I am doing wrong or a better solution to this?

You are using wrong serialize name. You are trying to assign value from node UserName to phName, which is not available. So, you are getting null.
Change
#SerializedName("UserName")
String phName;
with
#SerializedName("PhName") // change this
String phName;
Also, #SerializedName("Id") should be #SerializedName("id"). It's case sensitive.

Your SerializedName fields and the JSON fields don't match.
JSON: id -> GSON: Id
JSON: PhName -> GSON: UserName
Those two don't add up. You have to alter your annotations accordingly:
#SerializedName("id")
int id;
#SerializedName("PhName")
String phName;

Read JSONArray from JSONObject using GSON Android

How to read a JSONArray from a JSONObject using GSON.
I am trying to read this JSON String:
String str = { "text" : [
{
"id": 1,
"msg":"abc"
},
{
"id": 2,
"msg":"xyz"
},
{
"id": 3,
"msg":"pqr"
}
] }
The class is:
Class A {
int id;
String msg;
// And setters and getters
}
This code does not work:
class Test {
A [] text;
}
Test t = gson.fromJson(response, Test.class);
Also
class Test {
ArrayList<A> text = new ArrayList<A>();
}
Test t = gson.fromJson(response, Test.class);
How else can i read the string using my Test class?
Please help...

Update your class
public class A {
#SerializedName("id")
int id;
#SerializedName("msg")
String msg;
// And All setter and getter
}

The values given as "JSON String" are values to initiate the A class. And they are an array of As. What might work is
A[] t = gson.fromJson(response, A[].class);
Deserializing arrays is described in the manual, 5.4 Array Examples.

Gson parser class for dynamic json key value - Android

I've used gson library for parsing json response. its working well. now i got a problem .
i've got below response from webservice. the json key value is not static, it will dynamically change.
how to write a parser class to parse the below response.
Formatted JSON:
{
"meta": {
"code": 201,
"dataPropertyName": "activity",
"currentTime": "2014-02-05 06:15:04",
"listedCount": "2"
},
"activity": [
{
"comments": [
{
"raja": {
"type": "Liked",
"userPhoto": "663.png",
"userId": "74",
"userName": {
"1_0": "longjump"
},
"postOwner": "you",
"postDetails": {
"471": {
"postImage": "972.png",
"postId": "471",
"postType": "1"
}
},
"dateTime": "2014-02-05 05:24:56",
"sameOwner": "1"
}
}
]
},
{
"follow": [
{
"you": {
"type": "follow",
"followByUserName": {
"0_0": "olivepop",
"1_0": "yadidroy",
"2_0": "chitra"
},
"followUserName": "you",
"followByUserPhoto": "242.png",
"followUserPhoto": "953.png",
"dateTime": "2014-01-09 06:50:42"
}
}
]
}
],
"notifications": [
"Activities has been retrieved successfully"
]
}

Use this parser class
Meta meta = new Meta();
ArrayList<Activity> activity = new ArrayList<ActivityParser.Activity>();
ArrayList<String> notifications = new ArrayList<String>();
public class Meta
{
String code,dataPropertyName,currentTime,listedCount;
}
public class Activity
{
ArrayList<HashMap<String, CommentsItem>> comments = new ArrayList<HashMap<String,CommentsItem>>();
public class CommentsItem
{
String type,userPhoto,userId,postOwner,dateTime,sameOwner;
HashMap<String, String> userName = new HashMap<String,String>();
HashMap<String, PostDetails> postDetails = new HashMap<String,PostDetails>();
public class PostDetails
{
String postImage,postId,postType;
}
}
ArrayList<HashMap<String, FollowItem>> follow = new ArrayList<HashMap<String,FollowItem>>();
public class FollowItem
{
String type,followUserName,followByUserPhoto,followUserPhoto,dateTime;
HashMap<String, String> followByUserName = new HashMap<String,String>();
}
}

If possible get a JSON response with all possible "Key" values and then get the POJO class auto build from below link:
POJO FOR GSON
It will automatically handle all the posibilities. But make sure the RESPONCE you are providing while generating the POJO should hold all the possible combinations of your Key [changing once].
HOPE THIS HELPS!!

Depending on your specification, you can make a Default Webservice response model.java which would be something like:
String success;
#SerializedName("error_msg")
String errorMessage;
#SerializedName("error_code")
String errorCode;
JsonObject data;
where the Parent of the object with dynamic keys would be the "data".
Use Gson, map the model class:
webserviceResponse= gson.fromJson(contentResponse,WebserviceResponse.class);
if (StringUtils.isNotEmpty(webserviceResponse.getSuccess()) &&
StringUtils.equalsIgnoreCase(webserviceResponse.getSuccess(), "success")) {
//check for the dynamic key name
JsonObject job = webserviceResponse.getData();
dynamicallyDefinedKeyClass= gson.fromJson(job.get("dynamicKeyValue"), DynamicallyDefinedKeyClass.class);
}
Will edit my answer on question edit, in any way if it can help
Just a suggestion - raja, you etc. can be values for a key - name or commentsBy ? Where are you getting this response from?