Retrofit Singleton Example

Retrofit2Client.java

package com.tylerjroach.example.retrofit2;

import com.tylerjroach.example.BuildConfig;
import com.tylerjroach.example.util.Constants;
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit.RestAdapter;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class Retrofit2Client {

  private static Retrofit2Client instance = null;
  private Retrofit retrofit;
  private OkHttpClient client;

  private ExploreService exploreService;

  public Retrofit2Client() {

    HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
    loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    OkHttpClient.Builder okHttpBuilder = new OkHttpClient.Builder();
    okHttpBuilder.addInterceptor(new TokenInterceptor());

    if (BuildConfig.DEBUG) {
      okHttpBuilder.addInterceptor(loggingInterceptor);
    }

    client = okHttpBuilder.build();

    retrofit = new Retrofit.Builder().baseUrl(Constants.API_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .client(client)
        .build();

    exploreService = retrofit.create(ExploreService.class);
  }

  public static Retrofit2Client getInstance() {
    if (instance == null) {
      instance = new Retrofit2Client();
    }

    return instance;
  }

  public ExploreService getExploreService() {
    return exploreService;
  }
}

Thank you

is it better to use weakreference?