Tip Calculator App Issues
<p>I've been working on the 'Tip Calculator' app for Android and I have a couple of questions. </p>

<p>I'm supposed to (in the process of creating the GUI) use some <code>EditText</code>s to allow the user to enter the bill amount and read the calculated total bill. In the version I have, there is no <code>EditText</code> anywhere in the Visual Layout Editor, only <code>CheckText</code>. Are these the same? </p>

<p>Whenever I try to edit the Java code for the app, as per the book I have, I keep getting the message:</p>

<blockquote>
  <p>Thus and such is never used</p>
</blockquote>

<p>For example, with</p>

<pre><code>private static final String BILL_TOTAL = "BILL_TOTAL';
</code></pre>

<p>or anything from the import Android list, other than the one referring to a bundle. I'm Not sure how to resolve this. I have some experience with C and C++, but Java is new to me.</p>
