How to use

setFieldNamingPolicy

method

in

com.google.gson.GsonBuilder

 GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(CityList.class, new CityListDeserializer());
Gson gson = builder.setFieldNamingPolicy(LOWER_CASE_WITH_UNDERSCORES).create();
CityList list = gson.fromJson(json, CityList.class);

  public static Gson getInstance() {
    if (gson == null) {
      gson = new GsonBuilder()
          .setPrettyPrinting()
          .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
          .registerTypeAdapter(Date.class, new DateTypeAdapter())
          .create();
    }
    return gson;
  }
}

gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
gsonBuilder.registerTypeAdapter(Timestamp.class, new TimestampDeserializer());
Gson gson = gsonBuilder.create();

@Inject
public QueryParser(FeatureProcessor processingChain, QueryPluginFactory pluginFactory)
{
  m_processingChain = processingChain;
  m_pluginFactory = pluginFactory;
  m_descriptorMap = new HashMap<>();
  GsonBuilder gsonBuilder = new GsonBuilder();
  gsonBuilder.registerTypeAdapterFactory(new LowercaseEnumTypeAdapterFactory());
  gsonBuilder.registerTypeAdapter(TimeUnit.class, new TimeUnitDeserializer());
  gsonBuilder.registerTypeAdapter(TrimAggregator.Trim.class, new TrimDeserializer());
  gsonBuilder.registerTypeAdapter(FilterAggregator.FilterOperation.class, new FilterOperationDeserializer());
  gsonBuilder.registerTypeAdapter(DateTimeZone.class, new DateTimeZoneDeserializer());
  gsonBuilder.registerTypeAdapter(Metric.class, new MetricDeserializer());
  gsonBuilder.registerTypeAdapter(SetMultimap.class, new SetMultimapDeserializer());
  gsonBuilder.registerTypeAdapter(RelativeTime.class, new RelativeTimeSerializer());
  gsonBuilder.registerTypeAdapter(SetMultimap.class, new SetMultimapSerializer());
  gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
  m_gson = gsonBuilder.create();
}

.registerTypeAdapter(LocalTime.class, new LocalTimeAdapter())
.registerTypeAdapter(GeolocationApi.Response.class, new GeolocationResponseAdapter())
.setFieldNamingPolicy(fieldNamingPolicy)
.create();

.registerTypeAdapter(GeolocationApi.Response.class, new GeolocationResponseAdapter())
.registerTypeAdapter(EncodedPolyline.class, new EncodedPolylineInstanceCreator(""))
.setFieldNamingPolicy(fieldNamingPolicy)
.create();

public NeutronNetworksNorthboundAction(final URL url, final String username, final String password) {
  super(url, username, password);
  gsonNeutronNetwork = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
}

public NeutronNodesNorthboundAction(final URL url, final String username, final String password) {
  super(url, username, password);
  gsonNeutronNode = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
}

public NeutronPortsNorthboundAction(final URL url, final String username, final String password) {
  super(url, username, password);
  gsonNeutronPort = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
}

private static Gson setGsonDeserializer(final Map<Class<?>, JsonDeserializer<?>> classToDeserializerMap) {
  final GsonBuilder gsonBuilder = new GsonBuilder();
  for (final Map.Entry<Class<?>, JsonDeserializer<?>> entry : classToDeserializerMap.entrySet()) {
    gsonBuilder.registerTypeAdapter(entry.getKey(), entry.getValue());
  }
  return gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
}

gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
gsonBuilder.registerTypeAdapter(Child[].class, new ChildrenDeserializer());
Gson gson = gsonBuilder.create();

private Gson getGsonWithNamingPolicy(FieldNamingPolicy fieldNamingPolicy){
  return new GsonBuilder()
      .setFieldNamingPolicy(fieldNamingPolicy)
      .registerTypeAdapterFactory(SampleAdapterFactory.create())
      .create();
}

/**
 * Set a format for gson FIELD_NAMING_POLICY. See {@link FieldNamingPolicy}
 * 
 * @param FIELD_NAMING_POLICY
 */
public static final void setFIELD_NAMING_POLICY(
    FieldNamingPolicy FIELD_NAMING_POLICY) {
  GSON = new GsonBuilder().setPrettyPrinting()
      .setFieldNamingPolicy(FIELD_NAMING_POLICY).create();
}

/**
 * Set a format for gson FIELD_NAMING_POLICY. See {@link FieldNamingPolicy}
 * 
 * @param FIELD_NAMING_POLICY
 */
public static final void setFIELD_NAMING_POLICY(
    FieldNamingPolicy FIELD_NAMING_POLICY) {
  GSON = new GsonBuilder().setPrettyPrinting()
      .setFieldNamingPolicy(FIELD_NAMING_POLICY).create();
}

@Provides  // Dagger will only look for methods annotated with @Provides
@Singleton
Gson provideGson() {
  GsonBuilder gsonBuilder = new GsonBuilder();
  gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
  return gsonBuilder.create();
}

try {
     JSONObject object = new JSONObject("{\"array\":[{\"US\":\"id_123\"},{\"UK\":\"id_112\"},{\"EN\":\"id_1112\"}]}");
     GsonBuilder builder = new GsonBuilder();
     builder.registerTypeAdapter(new TypeToken<ArrayList<City>>() {}.getType(), new CityListDeserializer());
     Gson gson = builder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
     List<City> cityList = gson.fromJson(String.valueOf(object), new TypeToken<ArrayList<City>>() {}.getType());
   } catch (JSONException e) {
     e.printStackTrace();
   }

  @Override
  public JsonElement serialize(SettleAccountRecipient recipient, Type type, JsonSerializationContext jsonSerializationContext) {
    GsonBuilder gsonBuilder = new GsonBuilder()
        .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
        .disableHtmlEscaping();

    return gsonBuilder.create().toJsonTree(recipient, type);
  }
}

private synchronized Gson getGson() {
  if (gson == null) {
    GsonBuilder b = new GsonBuilder();
    b.setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE);
    BooleanSerializer serializer = new BooleanSerializer();
    b.registerTypeAdapter(Boolean.class, serializer);
    b.registerTypeAdapter(boolean.class, serializer);
    b.registerTypeAdapter(PushAttributes.class, new PushAttributes.PushAttributesSerializer());
    gson = b.create();
  }
  return gson;
}

private static Gson createGson() {
  GsonBuilder builder = new GsonBuilder();
  builder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
  builder.registerTypeAdapter(Date.class, new GsonDateTypeAdapter()); //to parse 2011-12-21 15:17:37
  builder.registerTypeAdapter(BitbucketPullRequestActivityInfo.class, new BitbucketPullRequestActivityEnvelopeDeserializer());
  return builder.create();
}

private Gson createGson() {
  return new GsonBuilder()
      .setFieldNamingPolicy(FieldNamingPolicy.IDENTITY)
      .registerTypeAdapter(Calendar.class, new CalendarTypeAdapter())
      .registerTypeAdapter(GregorianCalendar.class, new CalendarTypeAdapter())
      .registerTypeAdapter(byte[].class, getByteArrayTypeAdapter())
      .create();
}