Hi I already used GSON for parsing simple jsonobjects. But this time my response data is much complex. So I am struggling to parse that data.My data looks like :
[{"creator":"1", "users":[{"userName":"nilesh", "userAge":"25"},{"userName":"Me", "userAge":"25"}]},
{"creator":"2", "users":[{"userName":"nilesh", "userAge":"25"},{"userName":"Me", "userAge":"25"}]}
]
So I wrote one parsing class in following ways
public class UserData
{
#SerializedName("creator")
public String creator;
public List<Users> users;
public static class Users
{
#SerializedName("userName")
public String userName;
#SerializedName("userAge")
public String userAge;
}
}
But this is not working. Am I doing some thing wrong need some help regarding this parsing. thank you.
I tried to parse like this :
Gson gson = new Gson();
UserData users = gson.fromJson(result, UserData.class);
And it gives me error like this :
01-04 12:36:04.337: E/AndroidRuntime(15651): Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2
It is because your JSON you posted is invalid.
It should be like this The posted json below is your json which is valid.
[
{
"creator": "1",
"users": [
{
"userName": "nilesh",
"userAge": "25"
},
{
"userName": "Me",
"userAge": "25"
}
]
},
{
"creator": "2",
"users": [
{
"userName": "nilesh",
"userAge": "25"
},
{
"userName": "Me",
"userAge": "25"
}
]
}
]
The json you have posted contains errors at following points
users [ should be "users" :[
userAge : should be "userAge":
This is what I was looking for
public class UserData
{
public String creator;
public List<Users> user;
public class Users
{
public String userName;
public String userAge;
}
}
and I parse in following manner
Gson gson = new Gson();
Type type = new TypeToken<List<UserData>>(){}.getType();
List<UserData > objList = gson.fromJson(result, type);
Related
I'm a newbie in Retrofit. How to parse the Json below using retrofit?
{
"data": {
"Aatrox": {
"id": 266,
"title": "a Espada Darkin",
"name": "Aatrox",
"key": "Aatrox"
},
"Thresh": {
"id": 412,
"title": "o Guardião das Correntes",
"name": "Thresh",
"key": "Thresh"
}
},
"type":"champion",
"version":"6.23.1"
}
You could make your model POJO contain a Map<String, Champion> to deserialize into, to deal with the dynamic keys.
Example:
public class ChampionData {
public Map<String, Champion> data;
public String type;
public String version;
}
public class Champion {
public int id;
public String title;
public String name;
public String key;
}
I'm not familiar with Retrofit besides that, but as someone in the comments said, the deserializing is done by Gson:
public ChampionData champions = new Gson().fromJson(json, ChampionData.class);
So to build on to the answer someone else posted, you can then do the following, assuming you've added the GsonConverterFactory:
public interface API {
#GET("path/to/endpoint")
Call<ChampionData> getChampionData();
}
Assuming Retrofit2, the first thing you need to do is call following when building your Retrofit instance.
addConverterFactory(GsonConverterFactory.create())
Then it's just a matter of writing a POJO (e.g. MyPojoClass) that maps to the json and then adding something like following to your Retrofit interface.
Call<MyPojoClass> makeRequest(<some params>);
I want to parse JSON Array and display result in listview. I have already ask in this community but didn't get helpful answer. Please give me code for this JSON.
JSON
[{
"city_id": "1",
"city_name": "Noida"
},
{
"city_id": "2",
"city_name": "Delhi"
},
{
"city_id": "3",
"city_name": "Gaziyabad"
},
{
"city_id": "4",
"city_name": "Gurgaon"
},
{
"city_id": "5",
"city_name": "Gr. Noida"
}]
URL
http://14.140.200.186/Hospital/newget_city.php
please help
As mentioned the question is too broad, just to give the approach I would take.
Build the model class in this case: City
I would advise using retrofit(http://square.github.io/retrofit/) for the network call, so build the interface
Make the network call
Add the retrieved results in a recyclerview adapter
Using Gson can do the json parsing job for you. Its easy to integrate and handy to parse json data. You simply need to create a class containing city_id and city_name.
City.java
public class City {
private String city_id;
private String city_name;
public City() {
}
public String getCityId() {
return city_id;
}
public String getCityName() {
return city_name;
}
}
Now add another class. E.g. CityList.java
import java.util.List;
public class CityList {
private List<City> cityList;
public CityList() {
}
public List<City> getCityList() {
return cityList;
}
}
Now from json string, parse the data into the CityList class.
Gson gson = new Gson();
CityList myCityList = gson.fromJson(jsonString, CityList.class);
Add the gradle dependency for Gson in build.gradle
compile 'com.google.code.gson:gson:2.3'
I receive this jason as a response from a WS:
[
[
"test0",
"test0"
],
[
"test1",
"test1"
],
[
"test2",
"test2"
],
[
"test3",
"test3"
],
[
"test4",
"test4"
],
[
"test5",
"test5"
]
]
Notice that there are no name-value fields the json is an array of strings arrays.
I tried several attemps to parse the response. I tried with a pojo with a List of strings but I have the same error always:
retrofit.RetrofitError: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
MyPOJO for retrofit callback is the next one:
public class VotePollResults {
private List<PartialResult> fields;
public List<PartialResult> getFields() {
return fields;
}
public void setFields(List<PartialResult> fields) {
this.fields = fields;
}
public class PartialResult {
private String description;
private Integer votes;
public PartialResult(String description, Integer votes) {
this.description = description;
this.votes = votes;
}
public String getDescription() {
return description;
}
public Integer getVotes() {
return votes;
}
}
}
I have a List with a custom object, the one that handle that json structure.
Well I resolved the issue.
I have to use this as callback on retrofit
Callback<List<List<String>>>
Hope this helps to someone...
It looks like you are trying to parse Object instead of Array. In case of you response this code will work:
String[][] items = gson.fromJson(s, String[][].class);
Trying out Gson for the first time instead of looping through the JSON objects for speed.
This is my input data set for parsing
{
"data": [
{
"access_token": "XXXXX",
"category": "Community",
"name": "Startup notes by Vrashabh",
"id": "XXXXX",
"perms": [
"ADMINISTER",
"EDIT_PROFILE",
"CREATE_CONTENT",
"MODERATE_CONTENT",
"CREATE_ADS",
"BASIC_ADMIN"
]
},
{
"access_token": "XXXX",
"category": "Community",
"name": "Clean Bangalore",
"id": "XXXXX",
"perms": [
"ADMINISTER",
"EDIT_PROFILE",
"CREATE_CONTENT",
"MODERATE_CONTENT",
"CREATE_ADS",
"BASIC_ADMIN"
]
},
{
"access_token": "XXXXX",
"category": "Internet/software",
"name": "Getmeetin",
"id": "XXXXX",
"perms": [
"ADMINISTER",
"EDIT_PROFILE",
"CREATE_CONTENT",
"MODERATE_CONTENT",
"CREATE_ADS",
"BASIC_ADMIN"
]
}
],
"paging": {
"cursors": {
"before": "MTU3MzE3MTA0MjkyMjY4MQ==",
"after": "MjcyMTIwMzE2Mjk3NzI5"
}
}
}
And this is my gson mapping class
public class AccountsResponse {
ArrayList<AcResponseData> data;
ArrayList<PagingData> paging;
public class AcResponseData {
public String access_token;
public String category;
public String name;
public String id;
public String[] perms;
}
public class PagingData{
public Cursors cursors;
}
public class Cursors{
public String before;
public String after;
}
}
Code for parsing the data
AccountsResponse responseAccounts = gsonResponse.fromJson(response.getRawResponse(), AccountsResponse.class);
I Know I am supposed to not expect magic in terms of data conversion, I found the other questions on SO that ask me to implement TypeToken but I couldn't get it working for this case. How do I use TypeToken to get this data into the ORM
I wouldn't mind not reading that paging data also actually, if that needs to be eliminated from the ORM
UPDATE
Changed the ORM as below but now I get
java.lang.StackOverflowError
The problem is in your AccountsResponse class. It should be an object PagingData not an ArrayList, because from the json response in your question, "paging" is a JSON object not a JSON array. So, you should declare paging as a PagingData object not as an ArrayList of PagingData objects. That should fix it.
public class AccountsResponse {
ArrayList<AcResponseData> data;
PagingData paging;
public class AcResponseData {
public String access_token;
public String category;
public String name;
public String id;
public String[] perms;
}
public class PagingData{
public Cursors cursors;
}
public class Cursors{
public String before;
public String after;
}
}
Let me know if this helps.
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?