title: Difference between content_main.xml and activity_main.xml?
body: <p>I am new to Android App development. I have Android Studio 1.4. In my layout folder I have two XML files (<code>content_main.xml</code> and <code>activity_main.xml</code>). I have been following Bucky's tutorial and he just has the <code>activity_main.xml</code>. Which one should I use? </p>