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Voucherify-java-sdk is a Java client (can be used in Android application as well) which was created to simplify integration with Voucherify backend (http://www.voucherify.io)

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package io.voucherify.client.json.converter;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import retrofit.converter.ConversionException;
import retrofit.converter.Converter;
import retrofit.mime.TypedByteArray;
import retrofit.mime.TypedInput;
import retrofit.mime.TypedOutput;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Type;

public class JsonConverter implements Converter {

  private static final String MIME_TYPE = "application/json; charset=UTF-8";

  private final ObjectMapper objectMapper;

  public JsonConverter(ObjectMapper objectMapper) {
    this.objectMapper = objectMapper;
  }

  @Override
  public Object fromBody(TypedInput body, Type type) throws ConversionException {
    try {
      JavaType javaType = objectMapper.getTypeFactory().constructType(type);
      return objectMapper.readValue(body.in(), javaType);
    } catch (JsonParseException e) {
      throw new ConversionException(e);
    } catch (JsonMappingException e) {
      throw new ConversionException(e);
    } catch (IOException e) {
      throw new ConversionException(e);
    }
  }

  @Override
  public TypedOutput toBody(Object object) {
    try {
      String json = objectMapper.writeValueAsString(object);
      return new TypedByteArray(MIME_TYPE, json.getBytes("UTF-8"));
    } catch (JsonProcessingException e) {
      throw new AssertionError(e);
    } catch (UnsupportedEncodingException e) {
      throw new AssertionError(e);
    }
  }
}