NetworkModule.java

@Module
@InstallIn(SingletonComponent.class)
public class NetworkModule {

    @Provides
    @Singleton
    public static ApiService provideApiInterface() {
        Retrofit retrofit = getRetrofit(getOkHttpClient());
        return retrofit.create(ApiService.class);
    }

    @Provides
    @Singleton
    static Retrofit getRetrofit(OkHttpClient okHttpClient) {
        return new Retrofit.Builder()
                .baseUrl(APIConstants.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .client(okHttpClient)
                .build();
    }

    @Provides
    @Singleton
    static OkHttpClient getOkHttpClient() {
        OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder();
        okHttpClientBuilder.connectTimeout(APIConstants.CONNECT_TIMEOUT, TimeUnit.MILLISECONDS);
        okHttpClientBuilder.readTimeout(APIConstants.READ_TIMEOUT, TimeUnit.MILLISECONDS);
        okHttpClientBuilder.writeTimeout(APIConstants.WRITE_TIMEOUT, TimeUnit.MILLISECONDS);
        okHttpClientBuilder.addInterceptor(new RequestInterceptor());
        okHttpClientBuilder.addInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY));

        return okHttpClientBuilder.build();
    }
}