I'm a noob when it comes to basically all forms of storage aside from SharedPreferences and some SQLite. I did some searching and found that JSON+GSON was a fast way to parse Objects and their fields into storable Strings.
So, in my game, I have a Player object which has fields that are also my own classes:
public class Player {
private int something_game_related = 1;
private Skill equipped_skill;
private Item equipped_weapon;
public Player () {}
}
I suspect those classes are the problem, because when I try to run a simple save method:
private class ItemSerializer implements JsonSerializer<Item> {
public JsonElement serialize( Item src, Type typeOfSrc, JsonSerializationContext context ) {
return new JsonPrimitive(src.toString());
}
}
private class SkillSerializer implements JsonSerializer<Skill> {
public JsonElement serialize( Skill src, Type typeOfSrc, JsonSerializationContext context ) {
return new JsonPrimitive(src.toString());
}
}
public void doSave() {
GsonBuilder gson = new GsonBuilder();
//Both custom classes have zero-arg constructors so we don't need to register those
gson.registerTypeAdapter( Item.class, new ItemSerializer() );
gson.registerTypeAdapter( Skill.class, new SkillSerializer() );
Gson g = gson.create();
String mPlayer = "";
Type player = new TypeToken<Player>(){}.getType();
try{
mPlayer = g.toJson( GameView.mPlayer, player );
}
catch (Exception e) {e.printStackTrace();}
}
I get this Exception: java.lang.IllegalStateException: How can the type variable not be present in the class declaration!
My Question is..
How do I get these custom serializers to work? Like I said, I'm a noob.. but it looks like I did it right..
In the docs it says (kind of in the fine print) that static fields are excluded: http://sites.google.com/site/gson/gson-user-guide#TOC-Excluding-Fields-From-Serialization
You can do something like "excludeFieldsWithModifier(Modifier.STATIC)" in the GSON builder to include them.
Related
I'm struggling with TypeAdapter. Indeed for a json field, I can have an Array (when it's empty) or an Object (when it's not empty). This can't be changed.
Here is the JSON received :
{
"notifications": [
{
...
}
],
"meta": {
"pagination": {
"total": 13,
"count": 13,
"per_page": 20,
"current_page": 1,
"total_pages": 1,
"links": []
}
}
}
The field concerned is links, as you can see the field is inside pagination, which is inside meta. And that's my issue, I don't know how the TypeAdapter has to handle links in a two depth level.
I used this reply to start building a solution. Here it is :
My Custom TypeAdapter class :
public class PaginationTypeAdapter extends TypeAdapter<Pagination> {
private Gson gson = new Gson();
#Override
public void write(JsonWriter out, Pagination pagination) throws IOException {
gson.toJson(pagination, Links.class, out);
}
#Override
public Pagination read(JsonReader jsonReader) throws IOException {
Pagination pagination;
jsonReader.beginObject();
if (jsonReader.peek() == JsonToken.BEGIN_ARRAY) {
pagination = new Pagination((Links[]) gson.fromJson(jsonReader, Links[].class));
} else if(jsonReader.peek() == JsonToken.BEGIN_OBJECT) {
pagination = new Pagination((Links) gson.fromJson(jsonReader, Links.class));
} else {
throw new JsonParseException("Unexpected token " + jsonReader.peek());
}
return pagination;
}
}
My Pagination class :
public class Pagination {
private int total;
private int count;
#SerializedName("per_page")
private int perPage;
#SerializedName("current_page")
private int currentPage;
#SerializedName("total_pages")
private int totalPages;
private Links links;
Pagination(Links ... links) {
List<Links> linksList = Arrays.asList(links);
this.links = linksList.get(0);
}
}
And I'm building my Gson object like that :
Gson gson = new GsonBuilder().registerTypeAdapter(Pagination.class, new PaginationTypeAdapter()).create();
For now my error is : com.google.gson.JsonParseException: Unexpected token NAME
So I know I'm not doing it right, because I'm building my Gson with pagination. But I don't know how it should be handle. Using a TypeAdapter with meta ?
Any help will be welcome, thanks !
When you implement a custom type adapter, make sure that your type adapter has balanced token reading and writing: if you open a composite token pair like [ and ], you have to close it (applies for both JsonWriter and JsonReader). You just don't need this line to fix your issue:
jsonReader.beginObject();
because it moves the JsonReader instance to the next token, so the next token after BEGIN_OBJECT is either NAME or END_OBJECT (the former in your case sure).
Alternative option #1
I would suggest also not to use ad-hoc Gson object instatiation -- this won't share the configuration between Gson instances (say, your "global" Gson has a lot of custom adapters registered, but this internal does not have any thus your (de)serialization results might be very unexpected). In order to overcome this, just use TypeAdapterFactory that is more context-aware than a "free" Gson instance.
final class PaginationTypeAdapterFactory
implements TypeAdapterFactory {
private static final TypeAdapterFactory paginationTypeAdapterFactory = new PaginationTypeAdapterFactory();
private PaginationTypeAdapterFactory() {
}
static TypeAdapterFactory getPaginationTypeAdapterFactory() {
return paginationTypeAdapterFactory;
}
#Override
public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> typeToken) {
// Classes can be compared using == and !=
if ( typeToken.getRawType() != Pagination.class ) {
// Not Pagination? Let Gson pick up the next best-match
return null;
}
// Here we get the references for two types adapters:
// - this is what Gson.fromJson does under the hood
// - we save some time for the further (de)serialization
// - you classes should not ask more than they require
final TypeAdapter<Links> linksTypeAdapter = gson.getAdapter(Links.class);
final TypeAdapter<Links[]> linksArrayTypeAdapter = gson.getAdapter(Links[].class);
#SuppressWarnings("unchecked")
final TypeAdapter<T> typeAdapter = (TypeAdapter<T>) new PaginationTypeAdapter(linksTypeAdapter, linksArrayTypeAdapter);
return typeAdapter;
}
private static final class PaginationTypeAdapter
extends TypeAdapter<Pagination> {
private final TypeAdapter<Links> linksTypeAdapter;
private final TypeAdapter<Links[]> linksArrayTypeAdapter;
private PaginationTypeAdapter(final TypeAdapter<Links> linksTypeAdapter, final TypeAdapter<Links[]> linksArrayTypeAdapter) {
this.linksTypeAdapter = linksTypeAdapter;
this.linksArrayTypeAdapter = linksArrayTypeAdapter;
}
#Override
public void write(final JsonWriter out, final Pagination pagination)
throws IOException {
linksTypeAdapter.write(out, pagination.links);
}
#Override
public Pagination read(final JsonReader in)
throws IOException {
final JsonToken token = in.peek();
// Switches are somewhat better: you can let your IDE or static analyzer to check if you covered ALL the cases
switch ( token ) {
case BEGIN_ARRAY:
return new Pagination(linksArrayTypeAdapter.read(in));
case BEGIN_OBJECT:
return new Pagination(linksTypeAdapter.read(in));
case END_ARRAY:
case END_OBJECT:
case NAME:
case STRING:
case NUMBER:
case BOOLEAN:
case NULL:
case END_DOCUMENT:
// MalformedJsonException, not sure, might be better, because it's an IOException and the read method throws IOException
throw new MalformedJsonException("Unexpected token: " + token + " at " + in);
default:
// Maybe some day Gson adds something more here... Let be prepared
throw new AssertionError(token);
}
}
}
}
Alternative option #2
You can annotate your private Links links; with #JsonAdapter and bind a type adapter factory directly to links: Gson will "inject" links objects directly to Pagination instances, so you don't even need a constructor there.
I am using Retrofit 2 with GsonConverter. The problem is I have this response:
"responseData": {
"data": "<json array>"
}
As you can see one of the parameters is a JSON array, but it is a string. Should I use TypeAdapter and override the read and write methods? If so can you show how I can do this?
As you can see one of the parameters is a JSON array, but it is a string.
If the response generator is under your control, you should definitely change the response format (both for well-formedness and performance (Gson does not allow to read/write string literals as raw values)).
Should I use TypeAdapter and override the read and write methods?
If you cannot control your server response, you have to implement a custom type adapter with the read method implemented only. To align with that response format, you could define custom mappings like these:
final class Response<T> {
final ResponseData<T> responseData = null;
}
final class ResponseData<T> {
// This is where we're telling Gson to apply the special read strategy, not to all types
#JsonAdapter(RawJsonTypeAdapterFactory.class)
final T data = null;
}
As you can see, you just have to bind a custom type adapter to a specific field only. Despite the JsonAdapter annotation accepts TypeAdapter classes as well, you cannot bind TypeAdapter directly because you need Gson and Type instances.
final class RawJsonTypeAdapterFactory
implements TypeAdapterFactory {
// Gson will instantiate it itself without any issues
private RawJsonTypeAdapterFactory() {
}
#Override
public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> typeToken) {
// No additional checks here, we're assuming the necessary fields are properly annotated
final Type type = typeToken.getType();
return new TypeAdapter<T>() {
#Override
public void write(final JsonWriter out, final T value) {
throw new UnsupportedOperationException();
}
#Override
public T read(final JsonReader in)
throws IOException {
return gson.fromJson(in.nextString(), type);
}
}.nullSafe(); // And making the type adapter null-safe
}
}
Now JSON documents like
{
"responseData": {
"data": "[1,2,3]"
}
}
can be easily parsed in plain Java:
private static final Type intArrayResponseType = new TypeToken<Response<int[]>>() {
}.getType();
private static final Gson gson = new Gson();
...
try ( final JsonReader jsonReader = getPackageResourceJsonReader(Q43456942.class, "stringified.json") ) {
final Response<int[]> response = gson.fromJson(jsonReader, intArrayResponseType);
System.out.println(Arrays.toString(response.responseData.data));
}
Output:
[1, 2, 3]
Your Retrofit-bound service might have a method declared this (no type tokens necessary since Retrofit is smart enough to pass the Call parameterization to the underlying Gson converter):
Call<Response<int[]>> getIntArray();
I am new to the world of Generics and am trying to write a utility class that will take a list of Objects and persist it to the store and then retrieve it back.
This is what I wrote to save the list:
public static void saveListToStore(Context ctx, String fileName, list<Object> listToStore) throws IOException
{
String elemValue = "";
Gson gson = new Gson();
try {
FileOutputStream fileOutputStream = ctx.openFileOutput(fileName, ctx.MODE_PRIVATE);
elemValue= gson.toJson(listToStore);
fileOutputStream.write(elemValue.getBytes());
objectOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
However when I try to retrieve, I will not be aware of the type of object that was there in the list and cannot rebuild it back. I do not want to put type comparisons as I would like to save any type of custom class and the list can be huge.
I want to deduce the type from the content itself. I was thinking of saving the type as the first line and then the data. So on retrieve I can get the type first and then typecast the objects. However is there any other cleaner way of achieving this ?
Ur Object should implement Serializable and the below code can help you to read and write
public static void readListToStore(Context ctx, String fileName, List<Object> listToStore) throws IOException {
SharedPreferences storeDataPref = ctx.getSharedPreferences("UR_KEY", Context.MODE_PRIVATE);
String elemValue = storeDataPref.getString("UR_NAME", null);
if (elemValue != null) {
Type listType = new TypeToken<ArrayList<Object>>() {
}.getType();
listToStore = new Gson().fromJson(elemValue, listType);
}
}
public static void saveListToStore(Context ctx, String fileName, List<Object> listToStore) throws IOException {
String elemValue = "";
Gson gson = new Gson();
try {
FileOutputStream fileOutputStream = ctx.openFileOutput(fileName, ctx.MODE_PRIVATE);
elemValue = gson.toJson(listToStore);
SharedPreferences storeDataPref = ctx.getSharedPreferences("UR_KEY", Context.MODE_PRIVATE);
Editor storeDataEditor = storeDataPref.edit();
storeDataEditor.clear();
storeDataEditor.putString("UR_NAME", elemValue).apply();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
Taken from this question: Trouble with Gson serializing an ArrayList of POJO's
"You need to give Gson information on the specific generic type of List you're using (or any generic type you use with it). Particularly when deserializing JSON, it needs that information to be able to determine what type of object it should deserialize each array element to.
Type listOfTestObject = new TypeToken<List<TestObject>>(){}.getType();
String s = gson.toJson(list, listOfTestObject);
List<TestObject> list2 = gson.fromJson(s, listOfTestObject);
This is documented in the Gson user guide."
You can write and read the string to a file. The List can be of any collection type implementing the List interface
I was working on capturing the order of elements contained in tag. Here is all the code:
League.java:
#Root
#Convert(value = LeagueConverter.class)
public class League
{
#Attribute
private String name;
#Element(name="headlines", required = false)
private Headlines headlines;
#Element(name="scores", required = false)
private Scores scores;
#Element(name="standings", required = false)
private Standing standings;
#Element(name="statistics", required = false)
private LeagueStatistics statistics;
public List<String> order = new ArrayList<String>();
// get methods for all variables
}
LeagueConverter.java:
public class LeagueConverter implements Converter<League>
{
#Override
public League read(InputNode node) throws Exception
{
League league = new League();
InputNode next = node.getNext();
while( next != null )
{
String tag = next.getName();
if(tag.equalsIgnoreCase("headlines"))
{
league.order.add("headlines");
}
else if(tag.equalsIgnoreCase("scores"))
{
league.order.add("scores");
}
else if(tag.equalsIgnoreCase("statistics"))
{
league.order.add("statistics");
}
else if(tag.equalsIgnoreCase("standings"))
{
league.order.add("standings");
}
next = node.getNext();
}
return league;
}
#Override
public void write(OutputNode arg0, League arg1) throws Exception
{
throw new UnsupportedOperationException("Not supported yet.");
}
}
Exampe of XML:
<android>
<leagues>
<league name ="A">
<Headlines></Headlines>
<Scores></Scores>
...
</league>
<league name ="B">...</league>
</leagues>
</android>
How I'm calling it and expecting it to behave: (Snippet)
Android android = null;
Serializer serial = new Persister(new AnnotationStrategy());
android = serial.read(Android.class, source);
Log.i("Number of leagues found ",tsnAndroid.getLeagueCount() + ""); // prints fine
League nhl = tsnAndroid.getLeagues().get(0); // works fine
// DOES NOT WORK throws NullPointerEx
League nhl2 = tsnAndroid.getLeagueByName("A");
// DOES NOT WORK throws NullPointerEx
for(String s : nhl.getOrder())
{
Log.i("ORDER>>>>>", s);
}
The problem:
android.getLeagueByName() (Works with #Attribute name) suddenly stops working when I have the converter set, so its like the following from League.java, never gets set.
#Attribute
private String name; // not being set
However, when I comment out the converter declaration in League.java - Every league has an attribute called name and android.getLeagueByName() starts working fine...
Does #Convert for League somehow interfere with #Attribute in League?
Even though this question is outrageously old (as is the SimpleXML library), I will give my two cents.
#Convert annotation works only with #Element, but it does not have any effect on #Attribute. I'm not sure if that's a bug or a feature, but there is another way of handling custom serialized objects - called Transform with Matcher, and it works both with Attributes and with Elements. Instead of using the Converters, you define a Transform class that handles serialization and deserialization:
import java.util.UUID;
import org.simpleframework.xml.transform.Transform;
public class UUIDTransform implements Transform<UUID> {
#Override
public UUID read(String value) throws Exception {
return value != null ? UUID.fromString(value) : null;
}
#Override
public String write(UUID value) throws Exception {
return value != null ? value.toString() : null;
}
}
As you can see, it is more straight-forward than implementing the Convert interface!
Create a similar class for all your objects that require custom de/serialization.
Now instantiate a RegistryMatcher object and register there your custom classes with their corresponding Transform classes. This is a thread-safe object that internally uses a cache, so it might be a good idea to keep it as a singleton.
private static final RegistryMatcher REGISTRY_MATCHER = new RegistryMatcher();
static {
try {
REGISTRY_MATCHER.bind(UUID.class, UUIDTransform.class);
// register all your Transform classes here...
} catch (Exception e) {
throw new RuntimeException(e);
}
}
Finally, you can create a Persister class each time before a conversion and pass it the AnnotationStrategy together with your RegistryMatcher instance. In this factory method below, we will also use an indenting formatter:
private static Persister createPersister(int indent) {
return new Persister(new AnnotationStrategy(), REGISTRY_MATCHER, new Format(indent));
}
Now you can make your serialization/deserialization methods:
public static String objectToXml(Object object, int indent) throws MyObjectConversionException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
Persister p = createPersister(indent);
try {
p.write(object, out, "UTF-8");
return out.toString("UTF-8");
} catch (Exception e) {
throw new MyObjectConversionException("Cannot serialize object " + object + " to XML: " + e.getMessage(), e);
}
}
public static <T> T xmlToObject(String xml, final Class<T> clazz) throws MyObjectConversionException {
Persister p = createPersister(0);
try {
return (T) p.read(clazz, xml);
} catch (Exception e) {
throw new MyObjectConversionException(
"Cannot deserialize XML to object of type " + clazz + ": " + e.getMessage(), e);
}
}
The only issue with this approach is when you want to have different formatting for the same object - e.g. once you want the java.util.Date to have just the date component, while later on you also want to have the time component. Then just extend the Date class, calling it DateWithTime, and make a different Transform for it.
#ElementListUnion will capture the order of elements
The #Convert annotation works only on #Element fields. I am struggling against converting #Attribute fields too but with no success for now...
I want to serialize a custom Java object, so I can use SharedPreferences to store it and retreive it in another Activity. I don't need persistant storage, the SharedPreferences, I wipe them when my application is closed. I'm currently using GSON for this, but it doesn't seem to work well with Android's SparseArray type.
My objects:
public class PartProfile {
private int gameId;
// Some more primitives
private SparseArray<Part> installedParts = new SparseArray<Part>();
// ...
}
public class Part {
private String partName;
// More primitives
}
Serialization:
Type genericType = new TypeToken<PartProfile>() {}.getType();
String serializedProfile = Helpers.serializeWithJSON(installedParts, genericType);
preferences.edit().putString("Parts", serializedProfile).commit();
serializeWithJSON():
public static String serializeWithJSON(Object o, Type genericType) {
Gson gson = new Gson();
return gson.toJson(o, genericType);
}
Deserialization:
Type genericType = new TypeToken<PartProfile>() {}.getType();
PartProfile parts = gson.fromJson(preferences.getString("Parts", "PARTS_ERROR"), genericType);
SparseArray<Part> retreivedParts = parts.getInstalledParts();
int key;
for (int i = 0; i < retreivedParts.size(); i++) {
key = retreivedParts.keyAt(i);
// Exception here:
Part part = retreivedParts.get(key);
// ...
}
Exception:
java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to com.mypackage.objects.Part
I don't understand why Gson wants to cast a LinkedTreeMap to my object, I never use one in my entire program. I used to have a HashMap<Integer,Part> before I switched to the SparseArray<Part>, and never had issues with that. Are SparseArrays not supported by Gson, or is there an error on my side?
Edit: It seems that the SparseArray gets deserialized correctly, but not the objects inside. Instead of LinkedTreeMaps, these should be of type Part.
Really there is a way to serialize any kind of SparseArray, here is an example code:
public class SparseArrayTypeAdapter<T> extends TypeAdapter<SparseArray<T>> {
private final Gson gson = new Gson();
private final Class<T> classOfT;
private final Type typeOfSparseArrayOfT = new TypeToken<SparseArray<T>>() {}.getType();
private final Type typeOfSparseArrayOfObject = new TypeToken<SparseArray<Object>>() {}.getType();
public SparseArrayTypeAdapter(Class<T> classOfT) {
this.classOfT = classOfT;
}
#Override
public void write(JsonWriter jsonWriter, SparseArray<T> tSparseArray) throws IOException {
if (tSparseArray == null) {
jsonWriter.nullValue();
return;
}
gson.toJson(gson.toJsonTree(tSparseArray, typeOfSparseArrayOfT), jsonWriter);
}
#Override
public SparseArray<T> read(JsonReader jsonReader) throws IOException {
if (jsonReader.peek() == JsonToken.NULL) {
jsonReader.nextNull();
return null;
}
SparseArray<Object> temp = gson.fromJson(jsonReader, typeOfSparseArrayOfObject);
SparseArray<T> result = new SparseArray<T>(temp.size());
int key;
JsonElement tElement;
for (int i = 0; i < temp.size(); i++) {
key = temp.keyAt(i);
tElement = gson.toJsonTree(temp.get(key));
result.put(key, gson.fromJson(tElement, classOfT));
}
return result;
}
}
and to use it you need to register it in your Gson object, like this:
Type sparseArrayType = new TypeToken<SparseArray<MyCustomClass>>() {}.getType();
Gson gson = new GsonBuilder()
.registerTypeAdapter(sparseArrayType, new SparseArrayTypeAdapter<MyCustomClass>(MyCustomClass.class))
.create();
you can find this example in this gist.
P.S.: I know it's not optimized at all, but it's only an example to give an idea on how to achieve what you need.
It seems that the SparseArray gets deserialized correctly, but not the
objects inside. Instead of LinkedTreeMaps, these should be of type
Part.
Your observation is correct, since SparseArray contains Object (not Part), Gson won't have any clue to make Part as your object type. Hence it map your list as its infamous internal type LinkedTreeMap.
To solve it, I think you won't be able to use SparseArray... Or you may try retreivedParts.get(key).toString(), then use gson to parse the object again. But I don't think it's efficient to do that
As pointed out in the other answers SparseArray's internal implementation uses an Object[] to store the values so Gson cannot deserialize it correctly.
This can be solved by creating a custom Gson TypeAdapterFactory:
import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import android.util.SparseArray;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
public class SparseArrayTypeAdapterFactory implements TypeAdapterFactory {
public static final SparseArrayTypeAdapterFactory INSTANCE = new SparseArrayTypeAdapterFactory();
private SparseArrayTypeAdapterFactory() { }
#Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
// This factory only supports (de-)serializing SparseArray
if (type.getRawType() != SparseArray.class) {
return null;
}
// Get the type argument for the element type parameter `<E>`
// Note: Does not support raw SparseArray type (i.e. without type argument)
Type elementType = ((ParameterizedType) type.getType()).getActualTypeArguments()[0];
TypeAdapter<?> elementAdapter = gson.getAdapter(TypeToken.get(elementType));
// This is safe because check at the beginning made sure type is SparseArray
#SuppressWarnings("unchecked")
TypeAdapter<T> adapter = (TypeAdapter<T>) new SparseArrayTypeAdapter<>(elementAdapter);
// call nullSafe() to make adapter automatically handle `null` SparseArrays
return adapter.nullSafe();
}
private static class SparseArrayTypeAdapter<E> extends TypeAdapter<SparseArray<E>> {
private final TypeAdapter<E> elementTypeAdapter;
public SparseArrayTypeAdapter(TypeAdapter<E> elementTypeAdapter) {
this.elementTypeAdapter = elementTypeAdapter;
}
#Override
public void write(JsonWriter out, SparseArray<E> sparseArray) throws IOException {
out.beginObject();
int size = sparseArray.size();
for (int i = 0; i < size; i++) {
out.name(Integer.toString(sparseArray.keyAt(i)));
elementTypeAdapter.write(out, sparseArray.valueAt(i));
}
out.endObject();
}
#Override
public SparseArray<E> read(JsonReader in) throws IOException {
in.beginObject();
SparseArray<E> sparseArray = new SparseArray<>();
while (in.hasNext()) {
int key = Integer.parseInt(in.nextName());
E value = elementTypeAdapter.read(in);
// Use `append(...)` here because SparseArray is serialized in ascending
// key order so `key` will be > previously added key
sparseArray.append(key, value);
}
in.endObject();
return sparseArray;
}
}
}
This factory serializes SparseArrays as JSON objects with the key as JSON property name and the value serialized with the respective adapter as JSON value, e.g.:
new SparseArray<List<String>>().put(5, Arrays.asList("Hello", "World"))
↓ JSON
{"5": ["Hello", "World"]}
You then use this TypeAdapterFactory by creating your Gson instance using a GsonBuilder on which you register the TypeAdapterFactory:
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(SparseArrayTypeAdapterFactory.INSTANCE)
.create();