MainActivity.java

...
protected onCreate(Bundle savedStateInstance) {
  RestAdapter restAdapter = new RestAdapter.Builder()
    .setEndpoint("https://example.com")
    .build();

  SampleService service = restAdapter.create(SampleService.class);
  List<Repo> repos = service.listRepos("PRADA", 10);
}
...

SampleService.java

public interface SampleService
  @GET("/users/{user}/repos")
  List<Repo> listRepos(@Path("user") String user, @Query("limit") int limit);
}