Is there a way to set a base request parameter to be included in every request made with Square's Retrofit library?

Question

I'm using Square's Retrofit library for short-lived network calls. There are a few pieces of data that I include as @Query params on every request. Like so:

@GET("/thingOne.php") void thingOne(         @Query("app_version") String appVersion,         @Query("device_type") String deviceType,         Callback<Map<String,Object>> callback );  @GET("/thingTwo.php") void thingTwo(         @Query("app_version") String appVersion,         @Query("device_type") String deviceType,         Callback<Map<String,Object>> callback ); 

It's cumbersome to have to define appVersion and deviceType for every single endpoint outlined in the Interface. Is there a way to set a base set of parameters that should be included with every request? Something similar to how we set a common Authorization Header?

RestAdapter restAdapter = new RestAdapter.Builder()     .setServer("...")     .setRequestHeaders(new RequestHeaders() {         @Override         public List<Header> get() {             List<Header> headers = new ArrayList<Header>();                 Header authHeader = new Header(                     "Authorization", "Bearer " + token);                 headers.add(authHeader);             }             return headers;         }     })     .build(); this.service = restAdapter.create(ClientInterface.class); 

Answer 1

You can ensure all requests have these query parameters by adding a custom RequestInterceptor to your RestAdapter

RequestInterceptor requestInterceptor = new RequestInterceptor() {     @Override     public void intercept(RequestFacade request) {         request.addQueryParam("app_version", "Version 1.x");         request.addQueryParam("device_type", "Samsung S4");     } };  restAdapter.setRequestInterceptor(requestInterceptor)