1page.title=Creating Backward-Compatible UIs 2 3trainingnavtop=true 4startpage=true 5next.title=Abstracting the New Implementation 6next.link=abstracting.html 7 8@jd:body 9 10<div id="tb-wrapper"> 11<div id="tb"> 12 13<h2>Dependencies and prerequisites</h2> 14 15<ul> 16 <li>API level 5</li> 17 <li><a href="{@docRoot}tools/extras/support-library.html">The Android Support Package</a></li> 18</ul> 19 20<h2>You should also read</h2> 21 22<ul> 23 <li><a href="{@docRoot}resources/samples/ActionBarCompat/index.html">ActionBarCompat</a></li> 24 <li><a href="http://android-developers.blogspot.com/2010/07/how-to-have-your-cupcake-and-eat-it-too.html">How to have your (Cup)cake and eat it too</a></li> 25</ul> 26 27<h2>Try it out</h2> 28 29<div class="download-box"> 30<a href="http://developer.android.com/shareables/training/TabCompat.zip" 31 class="button">Download the sample app</a> 32<p class="filename">TabCompat.zip</p> 33</div> 34 35</div> 36</div> 37 38<p>This class demonstrates how to use UI components and APIs available in newer versions of Android in a backward-compatible way, ensuring that your application still runs on previous versions of the platform.</p> 39 40<p>Throughout this class, the new <a href="{@docRoot}guide/topics/ui/actionbar.html#Tabs">Action Bar Tabs</a> feature introduced in Android 3.0 (API level 11) serves as the guiding example, but you can apply these techniques to other UI components and API features.</p> 41 42<h2 id="lessons">Lessons</h2> 43 44 45<dl> 46 <dt><strong><a href="abstracting.html">Abstracting the New APIs</a></strong></dt> 47 <dd>Determine which features and APIs your application needs. Learn how to define application-specific, intermediary Java interfaces that abstract the implementation of the UI component to your application.</dd> 48 49 <dt><strong><a href="new-implementation.html">Proxying to the New APIs</a></strong></dt> 50 <dd>Learn how to create an implementation of your interface that uses newer APIs.</dd> 51 52 <dt><strong><a href="older-implementation.html">Creating an Implementation with Older APIs</a></strong></dt> 53 <dd>Learn how to create a custom implementation of your interface that uses older APIs.</dd> 54 55 <dt><strong><a href="using-component.html">Using the Version-Aware Component</a></strong></dt> 56 <dd>Learn how to choose an implementation to use at runtime, and begin using the interface in your application.</dd> 57</dl> 58