Why is my main.xml invisible to the compiler?
<p>I <em>do</em> have a \res\layout\main.xml file.</p>

<p>Yet, this:</p>

<pre><code>public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
</code></pre>

<p>...gives me the err msg, "R cannot be resolved to a variable"</p>

<p>in my Activity.java file.</p>

<p>What am I missing?</p>

<p>Alright, I see there is nothing in the project's Gen folder. What would cause it to not get populated?</p>
