title: onPostExecute getResources().getString NullPointerException
body: <p>When I run below code in the onPostExecute, it gives me an exception: <code>java.lang.NullPointerException</code>  </p>
  
  <pre><code>getApplicationContext().getResources().getString(R.string.lbl_sth);
  getBaseContext().getResources().getString(R.string.lbl_sth);
  </code></pre>
  
  <p><code>R.string.lbl_sth</code> is definitely correct. If I run above two lines in <code>onCreate</code>, both lines work as expected.</p>