Serializing custom object that contains JodaTime objects into JSON

Converters from https://github.com/gkopff/gson-javatime-serialisers are for java.time classes from Java8, e.g. java.time.LocalDate.

But you need converters for org.joda.time classes from 3rd part library. You can create custom converters for it, like:

Converter for org.joda.time.LocalDate

public class LocalDateSerializer implements JsonDeserializer<LocalDate>, JsonSerializer<LocalDate>{   private static final DateTimeFormatter DATE_FORMAT = ISODateTimeFormat.date();   @Override   public LocalDate deserialize(final JsonElement je, final Type type,                           final JsonDeserializationContext jdc) throws JsonParseException   {      final String dateAsString = je.getAsString();      if (dateAsString.length() == 0)      {         return null;      }      else      {         return DATE_FORMAT.parseLocalDate(dateAsString);               }   }   @Override   public JsonElement serialize(final LocalDate src, final Type typeOfSrc,                                final JsonSerializationContext context)   {      String retVal;      if (src == null)      {         retVal = "";      }      else      {         retVal = DATE_FORMAT.print(src);      }      return new JsonPrimitive(retVal);   }}   

Converter for org.joda.time.LocalTime

public class LocalTimeSerializer implements JsonDeserializer<LocalTime>, JsonSerializer<LocalTime>{   private static final DateTimeFormatter TIME_FORMAT = ISODateTimeFormat.timeNoMillis();   @Override   public LocalTime deserialize(final JsonElement je, final Type type,                           final JsonDeserializationContext jdc) throws JsonParseException   {      final String dateAsString = je.getAsString();      if (dateAsString.length() == 0)      {         return null;      }      else      {         return TIME_FORMAT.parseLocalTime(dateAsString);               }   }   @Override   public JsonElement serialize(final LocalTime src, final Type typeOfSrc,                                final JsonSerializationContext context)   {      String retVal;      if (src == null)      {         retVal = "";      }      else      {         retVal = TIME_FORMAT.print(src);      }      return new JsonPrimitive(retVal);   }}  

Usage

public void retrieveGlobalDataFromStorage(Context context){  // ...      final GsonBuilder builder = new GsonBuilder()       .registerTypeAdapter(LocalDate.class, new LocalDateSerializer())       .registerTypeAdapter(LocalTime.class, new LocalTimeSerializer());    final Gson gson = builder.create();  // ...