show list of articles or a button
<p>this is a very basic question, as I am just beginning with Android.</p>

<p>When I click a button I want to show a list of articles saved on my device and the user can choose one of them. BUT if there aren't any, I want to show a "Download" button to allow user to download the articles.
I don't know how to do the layouts - should I call a new <code>activityForResult</code> with a <code>ListActivity</code> intent ? but then, in case there are no articles, how will I show the button?</p>

<p>Thank you</p>
