gson

implement AsyncTask in Fragment android

There is easy step to crate asyntask within fragment in your fragment place code on activityCreateview new MyAsyncTask(getActivity(), mListView).execute(“”); getActivity() is method to communicate with fragment and activity in asynstak on post context.mListView.setArrayAdapter(………..) here is public class SalesFragment extends Fragment { GridView gridView; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View gv … Read more

Parsing a complex Json Object using GSON in Java

First problem: your VolumeContainer needs to be: public class VolumeContainer { public List<Volume> volumes; } it does not need to be static. Second problem: your Volume class should be like this: public class Volume { private String status; private Boolean managed; private String name; private Support support; private String storage_pool; private String id; private int … Read more

How to serialize Optional classes with Gson?

After several hours of gooling and coding – there is my version: public class OptionalTypeAdapter<E> extends TypeAdapter<Optional<E>> { public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() { @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) { Class<T> rawType = (Class<T>) type.getRawType(); if (rawType != Optional.class) { return null; } final ParameterizedType parameterizedType = (ParameterizedType) type.getType(); … Read more

How to serialize and deserialize Java 8’s java.time types with Gson? [closed]

There’s a Java 8 library here: https://github.com/gkopff/gson-javatime-serialisers Here’s the Maven details (check central for the latest version): <dependency> <groupId>com.fatboyindustrial.gson-javatime-serialisers</groupId> <artifactId>gson-javatime-serialisers</artifactId> <version>1.1.1</version> </dependency> And here’s a quick example of how you drive it: Gson gson = Converters.registerOffsetDateTime(new GsonBuilder()).create(); SomeContainerObject original = new SomeContainerObject(OffsetDateTime.now()); String json = gson.toJson(original); SomeContainerObject reconstituted = gson.fromJson(json, SomeContainerObject.class);

Using Gson with Interface Types

Polymorphic mapping of the type described is not available in Gson without some level of custom coding. There is an extension type adapter available as an extra that provides a bulk of the functionality you are looking for, with the caveat that the polymorphic sub-types need to be declared to the adapter ahead of time. … Read more

Using a generic type with Gson

The simplest approach for what you are attempting is to define the type of class which is to be returned in the method signature itself. You can do so by either passing an instance of ‘T’ to the method or the Class of the value to be returned. The second approach is the more typical … Read more

Gson turn an array of data objects into json – Android

Here’s a comprehensive example on how to use Gson with a list of objects. This should demonstrate exactly how to convert to/from Json, how to reference lists, etc. Test.java: import com.google.gson.Gson; import java.util.List; import java.util.ArrayList; import com.google.gson.reflect.TypeToken; import java.lang.reflect.Type; public class Test { public static void main (String[] args) { // Initialize a list of … Read more

Using gson to deserialize specific JSON field of an object

When parsing such a simple structure, no need to have dedicated classes. Solution 1 : To get the imgurURL from your String with gson, you can do this : JsonParser parser = new JsonParser(); JsonObject obj = parser.parse(toExtract).getAsJsonObject(); String imgurl = obj.get(“imgurl”).getAsString(); This uses a raw parsing into a JsonObject. Solution 2 : Alternatively, you … Read more