docs/html/training/app/rendering/index.jd

page.title=Rendering Performance
page.tags=render
page.article=true
@jd:body

<p>The most common performance problems are related to how your app draws, and how that
  eventually appears on the user's screen.</p>

  <p><b>Finding rendering problems</b> is an iterative process of using hands-on testing to
  identify problem spots, harness tools to discover the underlying cause, and improve your code.
  See also <a href="{@docRoot}/training/app/approach.html">
  Test Your App's Performance</a>.</p>

  <p><b>Optimizing rendering performance</b> means to remove unnecessary work, simplify structures
  and processes, manage bitmaps properly, and be mindful of the natural constraints imposed by the
  hardware and the Android system.</p>

  <p><b>The result of great rendering performance</b> is instantly INVISIBLE to your users. That
  is, your app runs so fast and smoothly, that users fully focus on their task, not on your
  app's UI and performance.</p>

  <p>You can test for and improve common rendering problems by using the tools and strategies
  recommended in this course.</p>

    <h2>Lessons</h2>

      <dl>
        <dt>
          <strong><a href="{@docRoot}training/app/rendering/overdraw.html">
            Visualizing and Reducing Overdraw</a></strong>
          </dt>
          <dd>
            Every time your app draws a pixel on the screen, it takes time. Learn how to
            find and fix performance problems related to drawing the same pixel more than once
            per screen.
          </dd>
          <dt>
          <strong><a href="{@docRoot}training/app/rendering/profile-gpu.html">
            Improving GPU Rendering Performance</a></strong>
          </dt>
          <dd>
            The most common issues that can make your app slow are related to the process of
            drawing on the screen. Learn how to find and fix issues that keep your app from
            rendering smoothly.
          </dd>
          <dt>
          <strong><a href="{@docRoot}training/app/rendering/hierarchies.html">
             Simplifying Complex View Hierarchies</a></strong>
          </dt>
          <dd>
            With feature-rich apps, the view hierarchy can grow large and complex and become a
            source of performance problems. Learn how to examine and simplify you app's view
            hierarchy.
          </dd>
          <dt>
          <strong><a href="{@docRoot}training/app/rendering/rendering-checklist.html">
             Rendering Problems Checklist</a></strong>
          </dt>
          <dd>
            There are many issues that can affect the rendering performance of your app. Learn
            how to diagnose and fix the most common ones.
          </dd>
        </dl>


    <h2>Resources</h2>

      <dl>
        <dt>
          <strong><a href="https://plus.sandbox.google.com/communities/116342551728637785407">
            Android Performance G+ Community</a></strong>
          </dt>
          <dd>
            Join our G+ community for more information, tips, and support. It's all about
            Performance!
            <br>#perfmatters.
          </dd>
          <dt>
          <strong><a href="https://www.udacity.com/course/android-performance--ud825">
            Android Performance Course on Udacity</a></li></strong>
          </dt>
          <dd>
            Dive deeply into Android Performance with this from-the-ground-up course.
          </dd>
          <dt>
          <strong><a href="https://www.youtube.com/playlist?list=PLOU2XLYxmsIKEOXh5TwZEv89aofHzNCiu">Android
          Performance Patterns on YouTube</a></strong>
          </dt>
          <dd>
            Watch the whole series of Android Performance Patterns videos.
          </dd>
        </dl>