title: gcm_defaultSenderId can't be resolved
body: <p>I'm trying to run <code>GCM</code> sample application present <a href="https://developers.google.com/cloud-messaging/android/start" rel="noreferrer">here</a> in my Eclipse.</p>
  
  <p>I'm not using Android studio and I don't have <code>gradle</code> plug-in in my eclipse.</p>
  
  <p>After importing the <code>GCM</code> client android app in eclipse, I'm getting error:</p>
  
  <blockquote>
    <p>gcm_defaultSenderId cannot be resolved or is not a field</p>
  </blockquote>
  
  <p>I do not want to shift to Android studio.</p>
  
  <ol>
  <li><p>How can I remove this error &amp; make my app run?</p></li>
  <li><p>If I've to install gradle, which plugin should I use in my Eclipse-MARS?</p></li>
  </ol>
  
  <p>PS - I've never used gradle before.</p>