title: getIdentifier() always returns 0
body: <p>I am trying to get the ID of a string with value "Hello" from strings.xml doing to following:</p>
  
  <pre><code>getContext().getResources().getIdentifier("Hello", "string", getContext().getPackageName());
  </code></pre>
  
  <p>It returns 0. Why is this returning 0?</p>