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<!DOCTYPE html>

<html>

<head>

<title>Optimizing Your UI | Android Developers</title>

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<h2 id="searchTitle">Results</h2>

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<li class="current">Optimizing Your UI</li>

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<ul>

<li><a href="../help/uiautomator/Configurator.html"><span class="en">Configurator</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/IAutomationSupport.html"><span class="en">IAutomationSupport</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiAutomatorTestCase.html"><span class="en">UiAutomatorTestCase</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiCollection.html"><span class="en">UiCollection</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiDevice.html"><span class="en">UiDevice</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiObject.html"><span class="en">UiObject</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiObjectNotFoundException.html"><span class="en">UiObjectNotFoundException</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiScrollable.html"><span class="en">UiScrollable</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiSelector.html"><span class="en">UiSelector</span></a></li>

<li><a href="http://developer.android.com/tools/help/uiautomator/UiWatcher.html"><span class="en">UiWatcher</span></a></li>

</ul>

</li>

<li><a href="http://developer.android.com/tools/help/zipalign.html">zipalign</a></li>

</ul>

</li>

</li>

<a href="http://developer.android.com/sdk/installing/studio-build.html">Build System</a>

</div>

<ul>

<span class="en">Configuring Gradle Builds</span></a></li>

<span class="en">Android Plugin for Gradle</span></a></li>

<span class="en">Apps Over 65K Methods</span></a></li>

</ul>

</li>

<div class="nav-section-header"><a href="http://developer.android.com/tools/support-library/index.html"><span

class="en">Support Library</span></a></div>

<ul>

<li><a href="http://developer.android.com/tools/support-library/features.html">Features</a></li>

<li><a href="http://developer.android.com/tools/support-library/setup.html">Setup</a></li>

</ul>

</li>

<div class="nav-section-header"><a href="http://developer.android.com/tools/revisions/index.html"><span class="en">Revisions</span></a></div>

<ul>

<span class="en">Android Studio</span>

</a></li>

<span class="en">SDK Tools</span>

</a></li>

<span class="en">SDK Build Tools</span>

</a></li>

<span class="en">SDK Platforms</span></a></li>

<span class="en">ADT Plugin</span></a></li>

</ul>

</li>

</div>

</li>

</div>

<ul>

<li><a href="http://developer.android.com/tools/adk/adk2.html">ADK 2012 Guide</a></li>

<li><a href="http://developer.android.com/tools/adk/adk.html">ADK 2011 Guide</a></li>

</ul>

</li>

<span class="en">Eclipse with ADT</span></a>

</div>

<ul>

<li><a href="http://developer.android.com/sdk/installing/migrate.html">Migrating to Android Studio</a></li>

<span class="en">Installing the Eclipse Plugin</span></a></li>

<li><a href="http://developer.android.com/tools/projects/projects-eclipse.html">Managing Projects</a></li>

<li><a href="http://developer.android.com/tools/building/building-eclipse.html">Building and Running</a></li>

<li><a href="http://developer.android.com/tools/building/building-cmdline-ant.html">Building with Ant</a></li>

<li><a href="http://developer.android.com/tools/testing/testing_eclipse.html">Testing</a></li>

<li><a href="http://developer.android.com/tools/debugging/debugging-projects.html">Debugging</a></li>

<li><a href="http://developer.android.com/tools/publishing/app-signing-eclipse.html">Signing Your Apps</a></li>

</ul>

</li>

</ul>

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<h1 itemprop="name" >Optimizing Your UI</h1>

<h2>In this document</h2>

<ol>

<li>

Using Hierarchy Viewer

</a>

<ol>

<li><a href="debugging-ui.html#runhv">Running Hierarchy Viewer and choosing a window</a></li>

<li><a href="debugging-ui.html#viewhierarchy">About the View Hierarchy window</a></li>

<li><a href="debugging-ui.html#indiView">Working with an individual View in Tree View</a></li>

<li><a href="debugging-ui.html#hvdebugging">Debugging with View Hierarchy</a></li>

<li><a href="debugging-ui.html#hvoptimize">Optimizing with View Hierarchy</a></li>

</ol>

</li>

<li>

Using Pixel Perfect

</a>

<ol>

<li><a href="debugging-ui.html#aboutpixelperfect">About the Pixel Perfect window</a></li>

<li><a href="debugging-ui.html#overlays">Working with Pixel Perfect overlays</a></li>

</ol>

</li>

<li><a href="debugging-ui.html#lint">Using lint to optimize your UI</a></li>

</ol>

<h2>Related videos</h2>

<ol>

<li>

width="210" height="160"

src="http://www.youtube.com/embed/PAgE7saQUUY?rel=0&hd=1"

frameborder="0" allowfullscreen>

</iframe>

</li>

<li>

width="210" height="160"

src="http://www.youtube.com/embed/C45bMZGdN7Y?rel=0&hd=1"

frameborder="0"

allowfullscreen>

</iframe>

</li>

</ol>

</div>

<p>

Sometimes your application's layout can slow down your application.

To help debug issues in your layout, the Android SDK provides the Hierarchy Viewer and

<code>lint</code> tools.

</p>

<p>The Hierarchy Viewer application allows you to debug and optimize your user interface. It

provides a visual representation of the layout's View hierarchy (the View Hierarchy window)

with performance information for each node in the layout,

and a magnified view of the display (the Pixel Perfect window) to closely examine the pixels

in your layout.</p>

<p>Android <code>lint</code> is a static code scanning tool that helps you optimize the layouts and layout

hierarchies of your applications, as well as detect other common coding problems. You can run it against your layout files or resource

directories to quickly check for inefficiencies or other types of problems that could be

affecting the performance of your application.</p>

<h2 id="HierarchyViewer">Using Hierarchy Viewer</h2>

<h3 id="runhv">Running Hierarchy Viewer and choosing a window</h3>

<p>

To run Hierarchy Viewer, follow these steps:</p>

<ol>

<li>

Connect your device or launch an emulator.

<p>

To preserve security, Hierarchy Viewer can only connect to devices running a

developer version of the Android system.

</p>

</li>

<li>

If you have not done so already, install the application you want to work with.

</li>

<li>

Run the application, and ensure that its UI is visible.

</li>

<li>

From a terminal, launch <code>hierarchyviewer</code> from the

<code><sdk>/tools/</code>

directory.

</li>

<li>

The first window you see displays a list of devices and emulators. To expand the list

of Activity objects for a device or emulator, click the arrow on the left. This displays a

list of the Activity objects whose UI is currently visible on the device or emulator. The

objects are listed by their Android component name. The list includes both your application

Activity and system Activity objects. A screenshot of this window appears in

figure 1.

</li>

<li>

Select the name of your Activity from the list. You can now look at its view

hierarchy using the View Hierarchy window, or look at a magnified image of the UI using

the Pixel Perfect window.

</li>

</ol>

<p>

To learn how to use the View Hierarchy window, go to

<a href="debugging-ui.html#viewhierarchy">About the View Hierarchy window</a>. To learn how to use the

Pixel Perfect window, go to <a href="debugging-ui.html#pixelperfect">About the Pixel Perfect window</a>.

</p>

<p class="img-caption"><strong>Figure 1.</strong> Hierarchy Viewer device window</p>

<h3 id="viewhierarchy">About the View Hierarchy window</h3>

<p>

The View Hierarchy window displays the View objects that form the UI of the

Activity that is running on your device or emulator. You use it to look at individual

View objects within the context of the entire View tree. For each View object, the View

Hierarchy window also displays rendering performance data.

</p>

<p>

To see the View Hierarchy window, run Hierarchy Viewer as described in

the section <a href="debugging-ui.html#runhv">Running Hierarchy Viewer and choosing a window</a>. Next, click

<strong>View Hierarchy</strong> at the top of the device window.

</p>

<p>

You should see four panes:

</p>

<ul>

<li>

<strong>Tree View</strong>: The left-hand pane displays the Tree View,

a diagram of the Activity object's hierarchy of views. Use Tree View to examine individual

View objects and see the relationships between View objects in your UI.

<p>

To zoom in on the pane, use the slider at the bottom of the pane, or use your mouse

scroll wheel. To move around in the pane or reveal View objects that are not currently

visible, click and drag the pane.

</p>

<p>

To highlight the nodes in the tree whose class or ID match a search string, enter the

string in the <strong>Filter by class or id:</strong> edit box at the bottom of the

window. The background of nodes that match the search string will change from gray to

bright blue.

</p>

<p>

To save a screenshot of Tree View to a PNG file, click <strong>Save As PNG</strong> at

the top of the View Hierarchy window. This displays a dialog in which you can choose

a directory and file name.

</p>

<p>

To save a layered screenshot of your device or emulator to an Adobe Photoshop (PSD)

file, click <strong>Capture Layers</strong> at the top of the View Hierarchy window.

This displays a dialog in which you can choose a directory or file name.

Each View in the UI is saved as a separate Photoshop layer.

</p>

<p>

In Photoshop (or similar program that accepts .psd files), you can hide, show or edit a

layer independently of others. When you save a layered screenshot, you can examine and

modify the image of an individual View object. This helps you experiment with design

changes.

</p>

</li>

<li>

The upper right-hand pane displays the <strong>Tree Overview</strong>, a smaller map

representation of the entire Tree View window. Use Tree Overview to identify the part of the

view tree that is being displayed in Tree View.

<p>

You can also use Tree Overview to move around in the Tree View pane. Click and drag

the shaded rectangle over an area to reveal it in Tree View.

</p>

</li>

<li>

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