Parsing json to pojo, which consist of lists, Using GSON

Parsing json to pojo, which consist of lists, Using GSON - java

I've got a problem when I try to parse a json string into my custom class, which consists of a list of another pojo.
the error I get is:
java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 226
And the class I try to parse is:
package com.example.client.models;
import java.util.List;
public class Catalog {
private List<Artist> list;
public Catalog() { }
/**
* #param list
*/
public Catalog(List<Artist> list) {
super();
this.list = list;
}
/**
* #return the list
*/
public List<Artist> getList() {
return list;
}
/**
* #param list the list to set
*/
public void setList(List<Artist> list) {
this.list = list;
}
}
And the artist class:
package com.example.client.models;
import java.io.File;
import java.util.List;
public class Artist {
private String artistName;
private List<Album> albumList;
private File artistFile;
public Artist() { }
/**
* #param artistName
* #param albumList
* #param artistFile
*/
public Artist(String artistName, List<Album> albumList, File artistFile) {
super();
this.artistName = artistName;
this.albumList = albumList;
this.artistFile = artistFile;
}
/**
* #return the artistName
*/
public String getArtistName() {
return artistName;
}
/**
* #param artistName the artistName to set
*/
public void setArtistName(String artistName) {
this.artistName = artistName;
}
/**
* #return the albumList
*/
public List<Album> getAlbumList() {
return albumList;
}
/**
* #param albumList the albumList to set
*/
public void setAlbumList(List<Album> albumList) {
this.albumList = albumList;
}
/**
* #return the artistFile
*/
public File getArtistFile() {
return artistFile;
}
/**
* #param artistFile the artistFile to set
*/
public void setArtistFile(File artistFile) {
this.artistFile = artistFile;
}
}
The Album class:
package com.example.client.models;
import java.io.File;
import java.util.List;
public class Album {
private String albumName;
private List<Song> songList;
private File albumFile;
public Album() { }
/**
* #param albumName
* #param songList
* #param albumFile
*/
public Album(String albumName, List<Song> songList, File albumFile) {
super();
this.albumName = albumName;
this.songList = songList;
this.albumFile = albumFile;
}
/**
* #return the albumName
*/
public String getAlbumName() {
return albumName;
}
/**
* #param albumName the albumName to set
*/
public void setAlbumName(String albumName) {
this.albumName = albumName;
}
/**
* #return the songList
*/
public List<Song> getSongList() {
return songList;
}
/**
* #param songList the songList to set
*/
public void setSongList(List<Song> songList) {
this.songList = songList;
}
/**
* #return the albumFile
*/
public File getAlbumFile() {
return albumFile;
}
/**
* #param albumFile the albumFile to set
*/
public void setAlbumFile(File albumFile) {
this.albumFile = albumFile;
}
}
and finally the song class:
package com.example.client.models;
import java.io.File;
public class Song {
private String songName;
private File songFile;
public Song() { }
/**
* #param songName
* #param songFile
*/
public Song(String songName, File songFile) {
super();
this.songName = songName;
this.songFile = songFile;
}
/**
* #return the songName
*/
public String getSongName() {
return songName;
}
/**
* #param songName the songName to set
*/
public void setSongName(String songName) {
this.songName = songName;
}
/**
* #return the songFile
*/
public File getSongFile() {
return songFile;
}
/**
* #param songFile the songFile to set
*/
public void setSongFile(File songFile) {
this.songFile = songFile;
}
}
I already have validated the json string, therefore I guess my problem lays in the GSON parsing. I hope you can help me with my problem
It would be nice if you could give an example or a hint of what to do.
Thanks on beforehand! ;)
EDIT
Hey again
I've included a sample of the JSON string i'm using:
{
"list":[
{
"artistName":"tmpArtistName",
"albumList":[
{
"albumName":"tmpAlbumName",
"songList":[
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
},
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
}
],
"albumFile":"/home/pi/tmpAlbumFile"
},
{
"albumName":"tmpAlbumName",
"songList":[
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
},
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
}
],
"albumFile":"/home/pi/tmpAlbumFile"
}
],
"artistFile":"/home/pi/tmpArtistFile"
},
{
"artistName":"tmpArtistName",
"albumList":[
{
"albumName":"tmpAlbumName",
"songList":[
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
},
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
}
],
"albumFile":"/home/pi/tmpAlbumFile"
},
{
"albumName":"tmpAlbumName",
"songList":[
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
},
{
"songName":"tmpSongName",
"songFile":"/home/pi/tmpSongFile"
}
],
"albumFile":"/home/pi/tmpAlbumFile"
}
],
"artistFile":"/home/pi/tmpArtistFile"
}
]
}

The Gson parser is apparently unable to deserialize strings directly into File objects. Instead it expects a matching JSON object (surrounded by { and }) in order to proceed with the unmarshalling. In order to get around this, you can simply register a type adapter to handle the file attributes:
public class FileTypeAdapter extends TypeAdapter<File> {
#Override
public void write(final JsonWriter out, final File value)
throws IOException {
if (value == null) {
out.nullValue();
} else {
out.value(value.getAbsolutePath());
}
}
#Override
public File read(final JsonReader in) throws IOException {
if (in.hasNext()) {
final String name = in.nextString();
return name != null ? new File(name) : null;
}
return null;
}
}
To use this, the rest of your code would remain the same, but replace the creation of your Gson parser:
final Gson gson = new Gson();
With this:
final Gson gson = new GsonBuilder().registerTypeAdapter(File.class,
new FileTypeAdapter()).create();
That should fix the issue.
On a side note, the Jackson library can handle these kind of deserializations with no special customization, if you are inclined and able to switch.

Related

Gson.fromJson(json, Custom.class) empty string

i'm developing a small web application.
That's my problem:
This is executed when a user try to add a new record in my Datatable
#RequestMapping(value="/saveJokerRule", method= RequestMethod.POST, consumes= "application/json", produces = "application/json")
#ResponseBody
public String saveJokerRule(#RequestBody String json) {
System.out.println("JSON EDITOR:" + json.toString());
EditorResponse editorResponse = new EditorResponse();
JokerRuleForm jokerRuleForm = new GsonBuilder().serializeNulls().create().fromJson(json, JokerRuleForm.class);
...
}
This is the valid json received by the server and printed by a System call:
{"action":"create","data":{"0":{"jokerRule":{"group":1,"campaignPhase":"","dailyLimit":"","weeklyLimit":"","monthlyLimit":"","validFrom":"","activity":1}}}}
That's the JokerRuleForm classs
public class JokerRuleForm {
#Expose
String action;
#Expose
#SerializedName("data")
Map<String, JokerRuleView> data;
...
}
That's the JokerRuleView class
public class JokerRuleView {
String idJokerRule;
private AgentGroup group;
private JokerRule jokerRule;
private Activity activity;
public class JokerRule{
private String campaignPhase;
private Integer dailyLimit;
private Integer weeklyLimit;
private Integer monthlyLimit;
private Date validFrom;
private Date dateUpdate;
private String group;
private String activity;
/**
* #return the campaignPhase
*/
public String getCampaignPhase() {
return campaignPhase;
}
/**
* #param campaignPhase the campaignPhase to set
*/
public void setCampaignPhase(String campaignPhase) {
this.campaignPhase = campaignPhase;
}
/**
* #return the dailyLimit
*/
public Integer getDailyLimit() {
return dailyLimit;
}
/**
* #param dailyLimit the dailyLimit to set
*/
public void setDailyLimit(Integer dailyLimit) {
this.dailyLimit = dailyLimit;
}
/**
* #return the weeklyLimit
*/
public Integer getWeeklyLimit() {
return weeklyLimit;
}
/**
* #param weeklyLimit the weeklyLimit to set
*/
public void setWeeklyLimit(Integer weeklyLimit) {
this.weeklyLimit = weeklyLimit;
}
/**
* #return the monthlyLimit
*/
public Integer getMonthlyLimit() {
return monthlyLimit;
}
/**
* #param monthlyLimit the monthlyLimit to set
*/
public void setMonthlyLimit(Integer monthlyLimit) {
this.monthlyLimit = monthlyLimit;
}
/**
* #return the validFrom
*/
public Date getValidFrom() {
return validFrom;
}
/**
* #param validFrom the validFrom to set
*/
public void setValidFrom(Date validFrom) {
this.validFrom = validFrom;
}
/**
* #return the dateUpdate
*/
public Date getDateUpdate() {
return dateUpdate;
}
/**
* #param dateUpdate the dateUpdate to set
*/
public void setDateUpdate(Date dateUpdate) {
this.dateUpdate = dateUpdate;
}
/**
* #return the group
*/
public String getGroup() {
return group;
}
/**
* #param group the group to set
*/
public void setGroup(String group) {
this.group = group;
}
/**
* #return the activity
*/
public String getActivity() {
return activity;
}
/**
* #param activity the activity to set
*/
public void setActivity(String activity) {
this.activity = activity;
}
}
public class Activity {
String idActivity;
String name;
/**
* #return the name
*/
public String getName() {
return name;
}
/**
* #param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* #return the idGroup
*/
public String getIdActivity() {
return idActivity;
}
/**
* #param idGroup the idGroup to set
*/
public void setIdActivity(String idActivity) {
this.idActivity = idActivity;
}
}
public class AgentGroup {
String idGroup;
String name;
/**
* #return the name
*/
public String getName() {
return name;
}
/**
* #param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* #return the idGroup
*/
public String getIdGroup() {
return idGroup;
}
/**
* #param idGroup the idGroup to set
*/
public void setIdGroup(String idGroup) {
this.idGroup = idGroup;
}
}
/**
* #return the idJokerRule
*/
public String getIdJokerRule() {
return idJokerRule;
}
/**
* #param idJokerRule the idJokerRule to set
*/
public void setIdJokerRule(String idJokerRule) {
this.idJokerRule = idJokerRule;
}
/**
* #return the agentGroup
*/
public AgentGroup getGroup() {
return group;
}
/**
* #param agentGroup the agentGroup to set
*/
public void setGroup(AgentGroup group) {
this.group = group;
}
/**
* #return the jokerRule
*/
public JokerRule getJokerRule() {
return jokerRule;
}
/**
* #param jokerRule the jokerRule to set
*/
public void setJokerRule(JokerRule jokerRule) {
this.jokerRule = jokerRule;
}
/**
* #return the activity
*/
public Activity getActivity() {
return activity;
}
/**
* #param activity the activity to set
*/
public void setActivity(Activity activity) {
this.activity = activity;
}
}
JokerRuleForm jokerRuleForm = new GsonBuilder().serializeNulls().create().fromJson(json, JokerRuleForm.class);
When executing this line i got a NumberFormatException empty string and i think it dailyLimit's or date's fault because it's empty and fromJson() method can't do what he need to do.
I've read something about a TypeAdapter that seems can fit to my case, but i don't really know how to proceed and i'm not sure is a valid solution.
Can someone help me?

The limit fields e.g. dailyLimit are empty strings in your JSON. This was suggested in JsonParseException when encountering an empty value for an int or long #472 issue but Gson team closed it because it makes no sense to parse "" as int.
One of the users provided a solution in his comment which allows to leniently parse the number values. I'd not go this route myself and fix JSON instead, but it's up to you:
public static final TypeAdapter<Number> UNRELIABLE_INTEGER = new TypeAdapter<Number>() {
#Override
public Number read(JsonReader in) throws IOException {
JsonToken jsonToken = in.peek();
switch (jsonToken) {
case NUMBER:
case STRING:
String s = in.nextString();
try {
return Integer.parseInt(s);
} catch (NumberFormatException ignored) {
}
try {
return (int)Double.parseDouble(s);
} catch (NumberFormatException ignored) {
}
return null;
case NULL:
in.nextNull();
return null;
case BOOLEAN:
in.nextBoolean();
return null;
default:
throw new JsonSyntaxException("Expecting number, got: " + jsonToken);
}
}
#Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
}
};
public static final TypeAdapterFactory UNRELIABLE_INTEGER_FACTORY = TypeAdapters.newFactory(int.class, Integer.class, UNRELIABLE_INTEGER);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(UNRELIABLE_INTEGER_FACTORY)
.create();

JAXB XML Unmarshaller error. Getting null value for all Object

I get the following error when I tried to parse the below string
<?xml version="1.0" encoding="UTF-8"?>
<CC5Response>
<OrderId>ORDER-17305KXSH11966</OrderId>
<GroupId>ORDER-173053333KXSH11966</GroupId>
<Response>Approved</Response>
<AuthCode>0293333584</AuthCode>
<HostRefNum>73051033333011833</HostRefNum>
<ProcReturnCode>00</ProcReturnCode>
<TransId>17305K33245XSH11968</TransId>
<ErrMsg></ErrMsg>
<Extra>
<SETTLEID>1</SETTLEID>
<TRXDATE>20171101 10:23:18</TRXDATE>
<ERRORCODE></ERRORCODE>
<CARDBRAND>VISA</CARDBRAND>
<CARDISSUER>CDM</CARDISSUER>
<NUMCODE>00</NUMCODE>
</Extra>
</CC5Response>
Code snippet for Unmarshalling is given below
JAXBContext jaxbContext = JAXBContext.newInstance(CC5Response.class);
XMLInputFactory xif = XMLInputFactory.newFactory();
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
XMLStreamReader xsr = xif.createXMLStreamReader(IOUtils.toInputStream(sb.toString(), "UTF-8"));
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
CC5Response res = (CC5Response) jaxbUnmarshaller.unmarshal(xsr);
System.out.println("*************"+res.toString());
bean class is given below
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType
#XmlRootElement(name = "CC5Response")
public class CC5Response {
#XmlAttribute
private String ProcReturnCode;
// #XmlAttribute
// private Extra Extra;
/*public Extra getExtra() {
return Extra;
}
public void setExtra(Extra extra) {
Extra = extra;
}*/
#XmlAttribute
private String AuthCode;
#XmlAttribute
private String OrderId;
#XmlAttribute
private String TransId;
#XmlAttribute
private String ErrMsg;
#XmlAttribute
private String Response;
#XmlAttribute
private String HostRefNum;
#XmlAttribute
private String GroupId;
I always get a plain object with null values.

To enable JAXB unmarshaller to work fine, you should simulate your XML into right structure of JAVA classes ... Follow the following steps and it will work with you.
Your XML should be like :
<?xml version="1.0" encoding="UTF-8"?>
<CC5Response>
<OrderId>ORDER-17305KXSH11966</OrderId>
<GroupId>ORDER-173053333KXSH11966</GroupId>
<Response>Approved</Response>
<AuthCode>0293333584</AuthCode>
<HostRefNum>73051033333011833</HostRefNum>
<ProcReturnCode>00</ProcReturnCode>
<TransId>17305K33245XSH11968</TransId>
<ErrMsg>error message</ErrMsg>
<Extra>
<SETTLEID>1</SETTLEID>
<TRXDATE>20171101 10:23:18</TRXDATE>
<ERRORCODE>0000</ERRORCODE>
<CARDBRAND>VISA</CARDBRAND>
<CARDISSUER>CDM</CARDISSUER>
<NUMCODE>00</NUMCODE>
</Extra>
</CC5Response>
We will create 2 necessary classes in Java :
2.1 create class named "CC5Response.java" like :
#XmlRootElement(name = "CC5Response")
public class CC5Response {
private String ProcReturnCode;
private String AuthCode;
private String OrderId;
private String TransId;
private String ErrMsg;
private String Response;
private String HostRefNum;
private String GroupId;
private List<Extra> Extra;
/**
* #return the ProcReturnCode
*/
#XmlElement(name="ProcReturnCode")
public String getProcReturnCode() {
return ProcReturnCode;
}
/**
* #param ProcReturnCode the ProcReturnCode to set
*/
public void setProcReturnCode(String ProcReturnCode) {
this.ProcReturnCode = ProcReturnCode;
}
/**
* #return the AuthCode
*/
#XmlElement(name="AuthCode")
public String getAuthCode() {
return AuthCode;
}
/**
* #param AuthCode the AuthCode to set
*/
public void setAuthCode(String AuthCode) {
this.AuthCode = AuthCode;
}
/**
* #return the OrderId
*/
#XmlElement(name="OrderId")
public String getOrderId() {
return OrderId;
}
/**
* #param OrderId the OrderId to set
*/
public void setOrderId(String OrderId) {
this.OrderId = OrderId;
}
/**
* #return the TransId
*/
#XmlElement(name="TransId")
public String getTransId() {
return TransId;
}
/**
* #param TransId the TransId to set
*/
public void setTransId(String TransId) {
this.TransId = TransId;
}
/**
* #return the ErrMsg
*/
#XmlElement(name="ErrMsg")
public String getErrMsg() {
return ErrMsg;
}
/**
* #param ErrMsg the ErrMsg to set
*/
public void setErrMsg(String ErrMsg) {
this.ErrMsg = ErrMsg;
}
/**
* #return the Response
*/
#XmlElement(name="Response")
public String getResponse() {
return Response;
}
/**
* #param Response the Response to set
*/
public void setResponse(String Response) {
this.Response = Response;
}
/**
* #return the HostRefNum
*/
#XmlElement(name="HostRefNum")
public String getHostRefNum() {
return HostRefNum;
}
/**
* #param HostRefNum the HostRefNum to set
*/
public void setHostRefNum(String HostRefNum) {
this.HostRefNum = HostRefNum;
}
/**
* #return the GroupId
*/
#XmlElement(name="GroupId")
public String getGroupId() {
return GroupId;
}
/**
* #param GroupId the GroupId to set
*/
public void setGroupId(String GroupId) {
this.GroupId = GroupId;
}
/**
* #return the Extra
*/
#XmlElement(name="Extra")
public List<Extra> getExtra() {
return Extra;
}
/**
* #param Extra the Extra to set
*/
public void setExtra(List<Extra> Extra) {
this.Extra = Extra;
}
}
2.2 create class named "Extra.java" like :
public class Extra {
private String SETTLEID;
private String TRXDATE;
private String ERRORCODE;
private String CARDBRAND;
private String CARDISSUER;
private String NUMCODE;
/**
* #return the SETTLEID
*/
public String getSETTLEID() {
return SETTLEID;
}
/**
* #param SETTLEID the SETTLEID to set
*/
public void setSETTLEID(String SETTLEID) {
this.SETTLEID = SETTLEID;
}
/**
* #return the TRXDATE
*/
public String getTRXDATE() {
return TRXDATE;
}
/**
* #param TRXDATE the TRXDATE to set
*/
public void setTRXDATE(String TRXDATE) {
this.TRXDATE = TRXDATE;
}
/**
* #return the ERRORCODE
*/
public String getERRORCODE() {
return ERRORCODE;
}
/**
* #param ERRORCODE the ERRORCODE to set
*/
public void setERRORCODE(String ERRORCODE) {
this.ERRORCODE = ERRORCODE;
}
/**
* #return the CARDBRAND
*/
public String getCARDBRAND() {
return CARDBRAND;
}
/**
* #param CARDBRAND the CARDBRAND to set
*/
public void setCARDBRAND(String CARDBRAND) {
this.CARDBRAND = CARDBRAND;
}
/**
* #return the CARDISSUER
*/
public String getCARDISSUER() {
return CARDISSUER;
}
/**
* #param CARDISSUER the CARDISSUER to set
*/
public void setCARDISSUER(String CARDISSUER) {
this.CARDISSUER = CARDISSUER;
}
/**
* #return the NUMCODE
*/
public String getNUMCODE() {
return NUMCODE;
}
/**
* #param NUMCODE the NUMCODE to set
*/
public void setNUMCODE(String NUMCODE) {
this.NUMCODE = NUMCODE;
}
}
Main Method should be like :
/**
* #param args the command line arguments
* #throws javax.xml.bind.JAXBException
*/
public static void main(String[] args) throws JAXBException {
// TODO code application logic here
try {
File file = new File("file.xml");
if (file.exists()) {
JAXBContext jaxbContext = JAXBContext.newInstance(CC5Response.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
CC5Response response = (CC5Response) jaxbUnmarshaller.unmarshal(file);
if (response != null) {
System.out.println("*************" + response.getAuthCode());
System.out.println("*************" + response.getErrMsg());
System.out.println("*************" + response.getGroupId());
System.out.println("*************" + response.getOrderId());
System.out.println("*************" + response.getResponse());
//you can get any field from Exta class
System.out.println("*************" + response.getExtra());
}
}
} catch (JAXBException e) {
e.printStackTrace();
}
}

passing custom object in retrofit2

i am trying to pass a custom object via retrofit2, and my question is that does the server writes my custom object to json automatically or do i have to write a php file for that. In the meanwhile I am posting successfully to the server but unable to write to json.
My aim is to write custom object to server, and write the contents of custom objects to json file.
Here is my Retrofit Api
public interface ApsaraCatalogAPI {
#GET("/apsaratrendz/data/apsara_json_document_v2.json")
Call<List<ApsaraCatalogModel>> getFeed();
#POST("/apsaratrendz/data/apsara_json_orders_document.json")
Call<Void> setOrder(#Body OrderModel orderModel);
}
Here is my calling api function
#Override
public void onClick(View v) {
int total = 0;
if(v.getId()==R.id.fabButtonCart && cartlist.size()!=0)
{
// get details from shared preferences
OrderModel orderModel = new OrderModel();
orderModel.setDate(getDate());
orderModel.setName("ssdfs");
orderModel.setEmail("sdf#gmail.com");
orderModel.setNoofitems(String.valueOf(cartlist.size()));
orderModel.setOrderno("32335");
orderModel.setPhone("9896566444");
for(int i=0; i<cartlist.size();i++){
Productdetail pd = new Productdetail();
pd.getSellingprice(String.valueOf(cartlist.get(i).getSellingPrice()));
pd.getPid(cartlist.get(i).getEANCode());
total += cartlist.get(i).getSellingPrice();
orderModel.getProductdetails().add(pd);
}
//
// now go for insertion using retrofit
requestData(orderModel);
Toast.makeText(getApplicationContext(), "Total Price : Rs."+total+"/-", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getApplicationContext(), "Cart is Empty", Toast.LENGTH_LONG).show();
}
}
And here is my service request for retrofit api, I am passing the newly created POJO OrderModel class.
private void requestData(OrderModel orderModel) {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(ENDPOINT)
.addConverterFactory(GsonConverterFactory.create())
.build();
ApsaraCatalogAPI service = retrofit.create(ApsaraCatalogAPI.class);
Call<Void> call = service.setOrder(orderModel);
call.enqueue(new Callback<Void>() {
#Override
public void onResponse(Call<Void> call, Response<Void> response) {
if(response.isSuccessful()){
Log.d("InApi","Yipppie");
}
}
#Override
public void onFailure(Call<Void> call, Throwable t) {
Log.d("InApi","Kaboom");
}
});
}
My POJO Class is given below:
import java.util.Map;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class OrderModel {
private String name;
private String email;
private String phone;
private String orderno;
private String date;
private String noofitems;
private List<Productdetail> productdetails = new ArrayList<Productdetail>();
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
/**
*
* #return
* The name
*/
public String getName() {
return name;
}
/**
*
* #param name
* The name
*/
public void setName(String name) {
this.name = name;
}
/**
*
* #return
* The email
*/
public String getEmail() {
return email;
}
/**
*
* #param email
* The email
*/
public void setEmail(String email) {
this.email = email;
}
/**
*
* #return
* The phone
*/
public String getPhone() {
return phone;
}
/**
*
* #param phone
* The phone
*/
public void setPhone(String phone) {
this.phone = phone;
}
/**
*
* #return
* The orderno
*/
public String getOrderno() {
return orderno;
}
/**
*
* #param orderno
* The orderno
*/
public void setOrderno(String orderno) {
this.orderno = orderno;
}
/**
*
* #return
* The date
*/
public String getDate() {
return date;
}
/**
*
* #param date
* The date
*/
public void setDate(String date) {
this.date = date;
}
/**
*
* #return
* The noofitems
*/
public String getNoofitems() {
return noofitems;
}
/**
*
* #param noofitems
* The noofitems
*/
public void setNoofitems(String noofitems) {
this.noofitems = noofitems;
}
/**
*
* #return
* The productdetails
*/
public List<Productdetail> getProductdetails() {
return productdetails;
}
/**
*
* #param productdetails
* The productdetails
*/
public void setProductdetails(List<Productdetail> productdetails) {
this.productdetails = productdetails;
}
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}
}
productdetails class :
import java.util.HashMap;
import java.util.Map;
public class Productdetail {
private String pid;
private String sellingprice;
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
/**
*
* #return
* The pid
* #param s
*/
public String getPid(String s) {
return pid;
}
/**
*
* #param pid
* The pid
*/
public void setPid(String pid) {
this.pid = pid;
}
/**
*
* #return
* The sellingprice
* #param s
*/
public String getSellingprice(String s) {
return sellingprice;
}
/**
*
* #param sellingprice
* The sellingprice
*/
public void setSellingprice(String sellingprice) {
this.sellingprice = sellingprice;
}
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
public void setAdditionalProperty(String name, Object value) {
this.additionalProperties.put(name, value);
}
}

Retrofit generates the json based on your POJO and set it on the post payload.
So, in this case:
#POST("/apsaratrendz/data/apsara_json_orders_document.json")
Call<Void> setOrder(#Body OrderModel orderModel);
the body of the post will be a json representation of orderModel.
If you need to change the names of the atributtes generated in the json you can use SerializedName Annotation, its very useful:
public class OrderModel {
#SerializedName("other_name_for_json")
private String name;
Hope it helps.

How do I store this JSONArray into an ArrayList?

I'm having some problems building an ArrayList from a JSONArray I called from an API Get. I am receiving an empty list. What am I doing wrong in my call?
The JSONArray i'm trying to receive is "recipes". I only need the "title" and "image_url".
{"count": 2, "recipes": [{"publisher": "The Pioneer Woman", "f2f_url": "http://food2fork.com/view/47024", "title": "Perfect Iced Coffee", "source_url": "http://thepioneerwoman.com/cooking/2011/06/perfect-iced-coffee/", "recipe_id": "47024", "image_url": "http://static.food2fork.com/icedcoffee5766.jpg", "social_rank": 100.0, "publisher_url": "http://thepioneerwoman.com"}, {"publisher": "Closet Cooking", "f2f_url": "http://food2fork.com/view/35382", "title": "Jalapeno Popper Grilled Cheese Sandwich", "source_url": "http://www.closetcooking.com/2011/04/jalapeno-popper-grilled-cheese-sandwich.html", "recipe_id": "35382", "image_url": "http://static.food2fork.com/Jalapeno2BPopper2BGrilled2BCheese2BSandwich2B12B500fd186186.jpg", "social_rank": 100.0, "publisher_url": "http://closetcooking.com"}]}
Method I use to retrieve the JSONArray and store it into an ArrayList.
public class JsonHelper {
public List<Recipe> getRecipes(String jsonText) {
List<Recipe> list = new ArrayList<Recipe>();
try {
JSONObject jsonObject = new JSONObject(jsonText);
JSONArray jsonArrayRecipes = jsonObject.getJSONArray("recipes");
for (int i = 0; i < jsonArrayRecipes.length(); i++) {
JSONObject jsonObjectRecipe = jsonArrayRecipes.getJSONObject(i);
Recipe recipe = new Recipe();
recipe.setImage_url(jsonObjectRecipe.getString("title"));
recipe.setName(jsonObjectRecipe.getString("image_url"));
list.add(recipe);
}
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return list;
}}
Method used in activity class. I blurred out the devkey in the API-call (link is working, see result:above).
private void readRecipes()
{
HttpReader httpReader = new HttpReader();
httpReader.setOnResultReadyListener(new HttpReader.OnResultReadyListener() {
#Override
public void resultReady(String result) {
JsonHelper jsonHelper = new JsonHelper();
recipes = jsonHelper.getRecipes(result);
}
});
httpReader.execute("http://food2fork.com/api/search?key={devkey}&q=");
}
Any help would be appreciated. Thanks in advance!

First of all create a class name recipe like this
public class Recipe {
private String publisher;
private String f2fUrl;
private String title;
private String sourceUrl;
private String recipeId;
private String imageUrl;
private Double socialRank;
private String publisherUrl;
/**
*
* #return
* The publisher
*/
public String getPublisher() {
return publisher;
}
/**
*
* #param publisher
* The publisher
*/
public void setPublisher(String publisher) {
this.publisher = publisher;
}
/**
*
* #return
* The f2fUrl
*/
public String getF2fUrl() {
return f2fUrl;
}
/**
*
* #param f2fUrl
* The f2f_url
*/
public void setF2fUrl(String f2fUrl) {
this.f2fUrl = f2fUrl;
}
/**
*
* #return
* The title
*/
public String getTitle() {
return title;
}
/**
*
* #param title
* The title
*/
public void setTitle(String title) {
this.title = title;
}
/**
*
* #return
* The sourceUrl
*/
public String getSourceUrl() {
return sourceUrl;
}
/**
*
* #param sourceUrl
* The source_url
*/
public void setSourceUrl(String sourceUrl) {
this.sourceUrl = sourceUrl;
}
/**
*
* #return
* The recipeId
*/
public String getRecipeId() {
return recipeId;
}
/**
*
* #param recipeId
* The recipe_id
*/
public void setRecipeId(String recipeId) {
this.recipeId = recipeId;
}
/**
*
* #return
* The imageUrl
*/
public String getImageUrl() {
return imageUrl;
}
/**
*
* #param imageUrl
* The image_url
*/
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
/**
*
* #return
* The socialRank
*/
public Double getSocialRank() {
return socialRank;
}
/**
*
* #param socialRank
* The social_rank
*/
public void setSocialRank(Double socialRank) {
this.socialRank = socialRank;
}
/**
*
* #return
* The publisherUrl
*/
public String getPublisherUrl() {
return publisherUrl;
}
/**
*
* #param publisherUrl
* The publisher_url
*/
public void setPublisherUrl(String publisherUrl) {
this.publisherUrl = publisherUrl;
}
}
Create a Arraylist of recipes
ArrayList<Recipe> recipes =new ArrayList<>();
Fill your arraylist like this
private void getRecipes(JSONObject response) {
try {
JSONArray recipes = response.getJSONArray("recipes");
for (int i = 0; i < recipes.length(); i++) {
JSONObject object = recipes.getJSONObject(i);
Recipe recipe = new Recipe();
recipe.setF2fUrl(object.getString("F2fUrl"));
recipe.setImageUrl(object.getString("ImageUrl"));
recipe.setPublisher(object.getString("Publisher"));
recipe.setPublisherUrl(object.getString("PublisherUrl"));
recipe.setRecipeId(object.getString("RecipeId"));
recipe.setSocialRank(object.getDouble("SocialRank"));
recipe.setSourceUrl(object.getString("SourceUrl"));
recipe.setTitle(object.getString("Title"));
recipesArrayList.add(recipe);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
i think this will help you very clearly

i think its work for you
public ArrayList<HashMap<String, String>> getRecipes(String jsonText) {
ArrayList<HashMap<String, String>> arra_list = new ArrayList<>();
try {
JSONObject jsonObject = new JSONObject(jsonText);
JSONArray recipesJsonArray = jsonObject.getJSONArray("recipes");
for (int i = 0; i < recipesJsonArray.length(); i++) {
HashMap<String, String> hashMap = new HashMap<>();
JSONObject jsonObject1 = recipesJsonArray.getJSONObject(i);
hashMap.put("title", jsonObject1.getString("title"));
hashMap.put("image_url", jsonObject1.getString("image_url"));
arra_list.add(hashMap);
}
} catch (JSONException e) {
e.printStackTrace();
}
return arra_list;
}

Having trouble using strings outside of Volley request onResponse

I have a search dialog in my MainActivity that when used sends the user query to a SearchActivity. From there I send a JSON request using volley and then deserialize the JSON using GSON. all of this is working good and I can even print, for an example, the latitude value of my request using:
System.out.println(cam[0].getLat());
However, all of this must be done within the onResponse of the volley request. I'm trying to send some of the values back to my MainActivity which I know how to do already. I just need to know how to store some of the strings so that I can access them outside of onResponse.
Method that sends request and deserializes it:
private void fetchJsonResponse() {
JsonArrayRequest req = new JsonArrayRequest(myUrl, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Gson gson = new Gson();
String nominatimData = response.toString();
NominatimModel[] cam = gson.fromJson(nominatimData, NominatimModel[].class);
// i'd like to using cam[0].getLat(); outside of this method
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
});
mRequestQueue.add(req);
}
NominatimModel.java
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import java.util.ArrayList;
import java.util.List;
public class NominatimModel {
#SerializedName("place_id")
#Expose
private String placeId;
#Expose
private String licence;
#SerializedName("osm_type")
#Expose
private String osmType;
#SerializedName("osm_id")
#Expose
private String osmId;
#Expose
private List<String> boundingbox = new ArrayList<String>();
#Expose
private String lat;
#Expose
private String lon;
#SerializedName("display_name")
#Expose
private String displayName;
#SerializedName("class")
#Expose
private String _class;
#Expose
private String type;
#Expose
private Double importance;
#Expose
private String icon;
/**
* #return The placeId
*/
public String getPlaceId() {
return placeId;
}
/**
* #param placeId The place_id
*/
public void setPlaceId(String placeId) {
this.placeId = placeId;
}
/**
* #return The licence
*/
public String getLicence() {
return licence;
}
/**
* #param licence The licence
*/
public void setLicence(String licence) {
this.licence = licence;
}
/**
* #return The osmType
*/
public String getOsmType() {
return osmType;
}
/**
* #param osmType The osm_type
*/
public void setOsmType(String osmType) {
this.osmType = osmType;
}
/**
* #return The osmId
*/
public String getOsmId() {
return osmId;
}
/**
* #param osmId The osm_id
*/
public void setOsmId(String osmId) {
this.osmId = osmId;
}
/**
* #return The boundingbox
*/
public List<String> getBoundingbox() {
return boundingbox;
}
/**
* #param boundingbox The boundingbox
*/
public void setBoundingbox(List<String> boundingbox) {
this.boundingbox = boundingbox;
}
/**
* #return The lat
*/
public String getLat() {
return lat;
}
/**
* #param lat The lat
*/
public void setLat(String lat) {
this.lat = lat;
}
/**
* #return The lon
*/
public String getLon() {
return lon;
}
/**
* #param lon The lon
*/
public void setLon(String lon) {
this.lon = lon;
}
/**
* #return The displayName
*/
public String getDisplayName() {
return displayName;
}
/**
* #param displayName The display_name
*/
public void setDisplayName(String displayName) {
this.displayName = displayName;
}
/**
* #return The _class
*/
public String getClass_() {
return _class;
}
/**
* #param _class The class
*/
public void setClass_(String _class) {
this._class = _class;
}
/**
* #return The type
*/
public String getType() {
return type;
}
/**
* #param type The type
*/
public void setType(String type) {
this.type = type;
}
/**
* #return The importance
*/
public Double getImportance() {
return importance;
}
/**
* #param importance The importance
*/
public void setImportance(Double importance) {
this.importance = importance;
}
/**
* #return The icon
*/
public String getIcon() {
return icon;
}
/**
* #param icon The icon
*/
public void setIcon(String icon) {
this.icon = icon;
}
}
Example JSON:
[{"place_id":"115063146","licence":"Data © OpenStreetMap contributors, ODbL 1.0. http:\/\/www.openstreetmap.org\/copyright","osm_type":"way","osm_id":"258132245","boundingbox":["29.7156836","29.7278762","-95.3520172","-95.3349753"],"lat":"29.7214917","lon":"-95.3440202128152","display_name":"University of Houston, 4800, Calhoun Road, Houston, Harris County, Texas, 77004, United States of America","class":"amenity","type":"university","importance":0.84733963787614,"icon":"http:\/\/nominatim.openstreetmap.org\/images\/mapicons\/education_university.p.20.png"}]
I'm fairly new to java and Android development so if someone can help me out a bit i'd appreciate it and if I left out any information let me know.

Figured I'd answer this question now that time has passed and I've learned a ton about Android, including how to accomplish this. So I had all my models implement Serializable, and then just bundled the response data and passed it to the other activity. I later, got rid of this and was able to accomplish everything I needed within the onResponse.
I'd steer away from using Serializable if you must do what I was trying to accomplish and instead check out the Parcelable interface, it has the advantage of being faster.
Hope this helps to anyone who comes across this question!

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