title: NullPointerException trying to access a String resource
body: <p>I have the following /res/values/uris.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;resources&gt;
  &lt;string name="bladder"&gt;blahblah&lt;/string&gt;
  &lt;/resources&gt;
  </code></pre>
  
  <p>I am accessing it in code:</p>
  
  <pre><code>private String bladderUrl= getString(R.string.bladder);
  </code></pre>
  
  <p>But it is returning null. I'm not sure why?</p>