Network Helper for RxJava, OkHttp, Gson

NetworkHelper.java

public class NetworkHelper {
  private OkHttpClient okHttpClient;
  private Gson gson;
  
  public NetworkHelper(OkHttpClient okHttpClient, Gson gson) {
    this.okHttpClient = okHttpClient;
    this.gson = gson;
  }
  
  /**
  makes a GET call through OkHttp
  return an Observable of type defined by clazz
  Usage:  
  NetworkHelper.get(baseUrl, String.class).compose(applySchedulers()).subscribe(s->{
    Do Awesome Things Here
  })
  **/
  public static <E> Observable<E> get(final String url, final Class<E> clazz) {
    return Observable.fromCallable(() -> {
        Request request = new Request.Builder().url(url).get().build();
        Response response = okHttpClient.newCall(request).execute();

        if (response.isSuccessful()) {
            String responseString = response.body().string();
            return gson.fromJson(responseString, clazz);
        } else {
            throw constructUnknownResponseException(response);
        }
    });
  }

  static RuntimeException constructUnknownResponseException(Response response) throws IOException {
    return new RuntimeException(String.format("Unknown response from Server {Code: %d Body: %s}", response.code(), response.body().string()));
  }
  
  <T> Observable.Transformer<T, T> applySchedulers() {
    return observable -> observable.subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread());
  }
}