.</li>
  <li>The user performs an action in your app that starts a new activity. The current activity
is stopped when the second activity is created. If the user then presses the <em>Back</em>
button, the first activity is restarted.</li>
  <li>The user receives a phone call while using your app on his or her phone.</li>
</ul>

<p>The <code><a href="../../../reference/android/app/Activity.html">Activity</a></code> class provides two lifecycle methods, <code><a href="../../../reference/android/app/Activity.h