page.title=Improving Layout Performance
page.tags="include","merge","viewstub","listview"

trainingnavtop=true
startpage=true
next.title=Optimizing Layout
next.link=optimizing-layout.html

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<h2>Dependencies and prerequisites</h2>
<ul>
 <li>Android 1.5 (API Level 3) or higher</li>
</ul>

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<h2>You should also read</h2>
<ul>
 <li><a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a></li>
</ul>

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</div>

<a class="notice-developers-video wide" href="http://www.youtube.com/watch?v=-FUw8HMbmBQ">
<div>
    <h3>Video</h3>
    <p>DevBytes: Optimising Layouts with Hierarchy Viewer</p>
</div>
</a>


<p>Layouts are a key part of Android applications that directly affect the user experience. If
implemented poorly, your layout can lead to a memory hungry application with slow UIs. The Android
SDK includes tools to help you identify problems in your layout performance, which when combined the
lessons here, you will be able to implement smooth scrolling interfaces with a minimum memory
footprint.</p>


<h2>Lessons</h2>

<dl>
  <dt><b><a href="optimizing-layout.html">Optimizing Layout Hierarchies</a></b></dt>
    <dd>In the same way a complex web page can slow down load time, your layout hierarchy
if too complex can also cause performance problems. This lesson shows how you can use SDK tools
to inspect your layout and discover performance bottlenecks.</dd>
  <dt><b><a href="reusing-layouts.html">Re-using Layouts with &lt;include/&gt;</a></b></dt>
    <dd>If your application UI repeats certain layout constructs in multiple places, this lesson
shows you how to create efficient, re-usable layout constructs, then include them in the appropriate
UI layouts.</dd>
  <dt><b><a href="loading-ondemand.html">Loading Views On Demand</a></b></dt>
    <dd>Beyond simply including one layout component within another layout, you might want to
make the included layout visible only when it's needed, sometime after the activity is running.
This lesson shows how you can improve your layout's initialization performance by loading
portions of your layout on demand.</dd>
  <dt><b><a href="smooth-scrolling.html">Making ListView Scrolling Smooth</a></b></dt>
    <dd>If you've built an instance of {@link android.widget.ListView} that contains complex or
data-heavy content in each list item, the scroll performance of the list might suffer. This
lesson provides some tips about how you can make your scrolling performance more smooth.</dd>
</dl>