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+page.title=Managing the Activity Lifecycle
+
+trainingnavtop=true
+startpage=true
+next.title=Launching an Activity
+next.link=starting.html
+
+@jd:body
+
+<div id="tb-wrapper">
+<div id="tb">
+
+
+<h2>Dependencies and prerequisites</h2>
+<ul>
+  <li>How to create an Android project (see <a
+href="{@docRoot}training/basics/firstapp/creating-project.html">Creating an Android
+Project</a>)</li>
+</ul>
+
+
+<h2>You should also read</h2>
+<ul>
+  <li><a href="{@docRoot}guide/topics/fundamentals/activities.html">Activities</a></li>
+</ul>
+
+
+<h2>Try it out</h2>
+
+<div class="download-box">
+ <a href="http://developer.android.com/shareables/training/ActivityLifecycle.zip"
+class="button">Download the demo</a>
+ <p class="filename">ActivityLifecycle.zip</p>
+</div>
+
+</div>
+</div>
+
+<p>As a user navigates through, out of, and back to your app, the
+{@link android.app.Activity} instances in your app transition between different states in their
+lifecycle. For instance, when your
+activity starts for the first time, it comes to the foreground of the system and receives user
+focus. During this process, the Android system calls a series of lifecycle methods on the
+activity in which you set up the user interface and other components. If the user performs an 
+action that starts another activity or switches to another app, the system calls another set of
+lifecycle methods on your activity as it moves into the background (where the activity is no
+longer visible, but the instance and its state remains intact).</p>
+
+<p>Within the lifecycle callback methods, you can declare how your activity behaves when the
+user leaves and  re-enters the activity.  For example, if you're building a streaming video player,
+you might pause the video and terminate the network connection when the user switches to another
+app. When the user returns, you can reconnect to the network and allow the user to resume the video
+from the same spot.</p>
+
+<p>This class explains important lifecycle callback methods that each {@link
+android.app.Activity} instance receives and how you can use them so your activity does what the
+user expects and does not consume system resources when your activity doesn't need them.</p>
+
+<h2>Lessons</h2>
+ 
+<dl>
+  <dt><b><a href="starting.html">Starting an Activity</a></b></dt>
+  <dd>Learn the basics about the activity lifecycle, how the user can launch your app, and how
+to perform basic activity creation.</dd>
+  <dt><b><a href="pausing.html">Pausing and Resuming an Activity</a></b></dt>
+  <dd>Learn what happens when your activity is paused (partially obscured) and resumed and what you
+should do during these state changes.</dd>
+  <dt><b><a href="stopping.html">Stopping and Restarting an Activity</a></b></dt>
+  <dd>Learn what happens when the user completely leaves your activity and returns to it.</dd>
+  <dt><b><a href="recreating.html">Recreating an Activity</a></b></dt>
+  <dd>Learn what happens when your activity is destroyed and how you can rebuild the activity
+state when necessary.</dd>
+</dl> 
+