封装Rxjava与Retrofit工具类的代码教程

public class RetrofitUtils {
    private static RetrofitUtils retrofitUtils;
    public static RetrofitApi retrofitApi;

    private RetrofitUtils() {

    }
    private RetrofitUtils getInstance(){

        if (retrofitUtils==null){

            retrofitUtils = new RetrofitUtils();
        }

        return retrofitUtils;
    }

    private static RetrofitApi retrofitApi1;

    static {


        OkHttpClient client = new OkHttpClient.Builder()
                .addInterceptor(new LoggingInterceptor())
                .build();
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(Constant.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .client(client)
                .build();
        retrofitApi = retrofit.create(RetrofitApi.class);
    }

}