title: How to get res Strings.xml from a retrofit interface class?
body: <p>I have a string in <code>res/strings.xml</code></p>
  <p><code>&lt;string name=&quot;clientId&quot;&gt;dfgljkwm51&lt;/string&gt;</code></p>
  <p>I want to use the string inside my retrofit interface class:</p>
  <pre><code>
  public class RetrofitInterfaces {
          public interface GetAlbum{
               @Headers(&quot;Authorization: Client-ID &quot; + clientId) //Want to use the String valye here.
               @GET
               Call&lt;Feed&gt; listRepos(@Url String url);
          }
  }
  </code></pre>
  <p>This is how im using the retrofit call:</p>
  <pre><code> private void makeNetworkCall(String url) {
          RetrofitInterfaces.GetAlbum service = RetrofitClientInstance.getRetrofitInstance()
                  .create(RetrofitInterfaces.GetAlbum.class);
          Call&lt;Feed&gt; call = service.listRepos(url);
          call.enqueue(new Callback&lt;Feed&gt;() {
              . . . 
  }
  </code></pre>
  <p>How do I pass this value into my Retrofit interfaces class so that I can use the value in the headers?</p>