How to delete R.id
<p>Experts,</p>

<p>For example, I have been once defined a R.id called age in xml, then I decided not to use it and deleted it.</p>

<p>Now, after I deleted it in xml, it seems it still exists in R.id, for I can still use below statement without warning/error.</p>

<p>This really bother me, I like to remove everything redundant, even a extra blank.
Plus, it would cause my program malfunction.</p>

<p>How to delete it?</p>

<p>Thanks.</p>

<pre><code>  txtThird = (TextView) convertView.findViewById(R.id.age);
</code></pre>