Gson type adapter to serialize and deserialize byte arrays in base64

GsonHelper.java

import java.lang.reflect.Type;

import android.util.Base64;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public class GsonHelper {
    public static final Gson customGson = new GsonBuilder().registerTypeHierarchyAdapter(byte[].class,
            new ByteArrayToBase64TypeAdapter()).create();

    // Using Android's base64 libraries. This can be replaced with any base64 library.
    private static class ByteArrayToBase64TypeAdapter implements JsonSerializer<byte[]>, JsonDeserializer<byte[]> {
        public byte[] deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
            return Base64.decode(json.getAsString(), Base64.NO_WRAP);
        }

        public JsonElement serialize(byte[] src, Type typeOfSrc, JsonSerializationContext context) {
            return new JsonPrimitive(Base64.encodeToString(src, Base64.NO_WRAP));
        }
    }
}

Using Java 1.8, with Lambdas, I have serialization a deserialization of byte arrays to Base64 with this code:

GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(byte[].class, (JsonSerializer<byte[]>) (src, typeOfSrc, context) -> new JsonPrimitive(Base64.getEncoder().encodeToString(src)));
builder.registerTypeAdapter(byte[].class, (JsonDeserializer<byte[]>) (json, typeOfT, context) -> Base64.getDecoder().decode(json.getAsString()));
Gson gson = builder.create();

Thanks!