Is there a way to add query parameter to every request with Retrofit 2?

Question

I need to add a query parameter to every request made by Retrofit 2.0.0-beta2 library. I found this solution for Retrofit 1.9, but how to add RequestInterceptor in newest library version?

My interface:

@GET("user/{id}") Call<User> getUser(@Path("id")long id);  @GET("users/") Call<List<User>> getUser(); 

Client:

Retrofit retrofit = new Retrofit.Builder()                     .baseUrl(BASE_URL)                     .addConverterFactory(GsonConverterFactory.create())                     .client(CLIENT)  // custom OkHTTP Client                     .build(); service = retrofit.create(userService.class); 

Answer 1

For the sake of completeness, here is the full code you need to add a parameter to every Retrofit 2.x request using a OkHttp-Interceptor:

OkHttpClient client = new OkHttpClient();  client.interceptors().add(new Interceptor() {     @Override     public Response intercept(Chain chain) throws IOException {         Request request = chain.request();         HttpUrl url = request.url().newBuilder().addQueryParameter("name","value").build();         request = request.newBuilder().url(url).build();         return chain.proceed(request);     } });  Retrofit retrofit = new Retrofit.Builder()         .baseUrl("...")         .client(client)         .build(); 

Answer 2

now the Retrofit has release 2.0.0 and this is my solution:

OkHttpClient client = new OkHttpClient.Builder()         .addInterceptor(new Interceptor() {             @Override             public Response intercept(Chain chain) throws IOException {                  String uid = "0";                 long timestamp = (int) (Calendar.getInstance().getTimeInMillis() / 1000);                 String signature = MD5Util.crypt(timestamp + "" + uid + MD5_SIGN);                 String base64encode = signature + ":" + timestamp + ":" + uid;                 base64encode = Base64.encodeToString(base64encode.getBytes(), Base64.NO_WRAP | Base64.URL_SAFE);                  Request request = chain.request();                 HttpUrl url = request.url()                         .newBuilder()                         .addQueryParameter("pageSize", "2")                         .addQueryParameter("method", "getAliasList")                         .build();                  request = request                         .newBuilder()                         .addHeader("Authorization", "zui " + base64encode)                         .addHeader("from_client", "ZuiDeer")                         .url(url)                         .build();                  Response response = chain.proceed(request);                 return response;             }         }).build();   Retrofit retrofit = new Retrofit.Builder()         .baseUrl(ApiConstants.API_BASE_URL)         .client(client)         .addConverterFactory(GsonConverterFactory.create())         .addCallAdapterFactory(RxJavaCallAdapterFactory.create())         .build();  mRestfulService = retrofit.create(RestfulService.class);