appclient.java

public class AppClient {
    public static Retrofit mRetrofit;

    public static Retrofit retrofit() {
        if (mRetrofit == null) {
            OkHttpClient.Builder builder = new OkHttpClient.Builder();

            if (BuildConfig.DEBUG) {
                HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
                loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
                builder.addInterceptor(loggingInterceptor);
            }
            final String clientId = "NAVER client id ";//애플리케이션 클라이언트 아이디값";
            final String clientSecret = "NAVER secret id";//애플리케이션 클라이언트 시크릿값";

            builder.addInterceptor(new Interceptor() {
                @Override
                public Response intercept(Chain chain) throws IOException {
                    Request request = chain.request().newBuilder()
                            .addHeader("X-Naver-Client-Id", clientId)
                            .addHeader("X-Naver-Client-Secret", clientSecret)
                            .build();
                    return chain.proceed(request);
                }
            });

            OkHttpClient okHttpClient = builder.build();

            mRetrofit = new Retrofit.Builder()
                    .baseUrl(ApiStores.API_SERVER_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .client(okHttpClient)
                    .build();
        }
        return mRetrofit;
    }

}