docs/html/sdk/installing.jd - platform/frameworks/base - Git at Google

 page.title=Installing the Android SDK
 sdk.preview=0

 @jd:body

 <div id="qv-wrapper">
 <div id="qv">

   <h2>In this document</h2>
   <ol>
     <li><a href="#Preparing">Prepare for Installation</a></li>
     <li><a href="#Installing">Install the SDK</a></li>
     <li><a href="#InstallingADT">Install the ADT Plugin for Eclipse</a></li>
     <li><a href="#components">Add Platforms and Other SDK Components</a></li>
     <li><a href="#sdkContents">Explore the SDK</a></li>
     <li><a href="#NextSteps">Next Steps</a></li>
     <li><a href="#troubleshooting">Troubleshooting</a></li>
   </ol>

 <h2>See also</h2>
   <ol>
     <li><a href="{@docRoot}sdk/eclipse-adt.html">Installing ADT</a></li>
     <li><a href="{@docRoot}sdk/adding-components.html">Adding SDK Components</a></li>
   </ol>

 </div>
 </div>

 <p>This page describes how to install the Android SDK and set up your
 development environment for the first time.</p>

 <p>If you encounter any problems during installation, see the
 <a href="#troubleshooting">Troubleshooting</a> section at the bottom of
 this page.</p>

 <h4>Updating?</h4>

 <p>If you are currently using the Android 1.6 SDK, you do not necessarily need
 to install the new SDK, since your existing SDK already includes the Android SDK
 and AVD Manager tool. To develop against the new Android 2.0 platform, for
 example, you could just download the updated SDK Tools (Revision 3) and the
 Android 2.0 platform into your existing SDK.</p>

 <p>If you are using Android 1.5 SDK or older, you should install the new SDK as
 described in this document and move your application projects to the new
 environment. </p>

 <h2 id="Preparing">Prepare for Installation</h2>

 <p>Before you begin, take a moment to confirm that your development machine
 meets the <a href="requirements.html">System Requirements</a>.</p>

 <p>If you will be developing in Eclipse with the Android Development
 Tools (ADT) Plugin &mdash; the recommended path if you are new to
 Android &mdash; make sure that you have a suitable version of Eclipse
 installed on your computer (3.4 or newer is recommended). If you need
 to install Eclipse, you can download it from this location: </p>

 <p style="margin-left:2em;"><a href=
 "http://www.eclipse.org/downloads/">http://www.eclipse.org/downloads/</a></p>

 <p>A Java or RCP version of Eclipse is recommended. For Eclipse 3.5, the
 "Eclipse Classic" version is recommended.</p>

 <h2 id="Installing">Download and Install the SDK</h2>

 <p>Download the SDK package that is appropriate for your development computer.
 Unpack the Android SDK archive to a suitable location on your machine. By
 default, the SDK files are unpacked into a directory named
 <code>android-sdk-&lt;machine-platform&gt;</code>. </p>

 <p>Make a note of the name and location of the unpacked SDK directory on your
 system &mdash; you will need to refer to the SDK directory later, when setting
 up the ADT plugin or when using the SDK tools.</p>

 <p>Optionally, you may want to add the location of the SDK's primary
 <code>tools</code> directory to your system <code>PATH</code>. The primary
 <code>tools/</code> directory is located at the root of the SDK folder. Adding
 <code>tools</code> to your path lets you run Android Debug Bridge (adb) and the
 other command line <a
 href="{@docRoot}guide/developing/tools/index.html">tools</a> without needing to
 supply the full path to the tools directory. </p>

 <ul>
     <li>On Linux, edit your <code>~/.bash_profile</code> or <code>~/.bashrc</code> file. Look
     for a line that sets the PATH environment variable and add the
     full path to the <code>tools/</code> directory to it. If you don't
     see a line setting the path, you can add one:</li>

     <ul><code>export PATH=${PATH}:<em>&lt;your_sdk_dir&gt;</em>/tools</code></ul>

     <li>On a Mac OS X, look in your home directory for <code>.bash_profile</code> and
     proceed as for Linux. You can create the <code>.bash_profile</code> if
     you haven't already set one up on your machine. </li>

     <li>On Windows, right-click on My Computer, and select Properties.
   Under the Advanced tab, hit the Environment Variables button, and in the
   dialog that comes up, double-click on Path (under System Variables). Add the full path to the
   <code>tools/</code> directory to the path. </li>
   </ul>

 <p>If you will be using the Eclipse IDE as your development environment,
 the next section describes how to install the Android Development Tools (ADT) plugin and set up Eclipse.
 If you choose not to use Eclipse, you can
 develop Android applications in an IDE of your choice and then compile, debug and deploy using
 the tools included in the SDK (skip to <a href="#NextSteps">Next Steps</a>).</p>


 <h2 id="InstallingADT">Install the ADT Plugin for Eclipse</h2>

 <p>Android offers a custom plugin for the Eclipse IDE, called Android
 Development Tools (ADT), that is designed to give you a powerful,
 integrated environment in which to build Android applications. It
 extends the capabilites of Eclipse to let you quickly set up new Android
 projects, create an application UI, add components based on the Android
 Framework API, debug your applications using the Android SDK tools, and even export
 signed (or unsigned) APKs in order to distribute your application.</p>

 <p>In general, using Eclipse with ADT is a highly recommended approach to
 Android development and is the fastest way to get started. For complete
 information about how to install ADT, see
 <a href="{@docRoot}sdk/eclipse-adt.html">Installing and Updating ADT</a>.</p>

 <p>If you prefer to work in an IDE other than Eclipse, you do not need to
 install Eclipse or ADT, instead, you can directly use the SDK tools to build and
 debug your application.</p>


 <h2 id="components">Add Android Platforms and Other Components</h2>

 <div class="sidebox-wrapper">
 <div class="sidebox">
 <p>The <strong>Android SDK and AVD Manager</strong> tool is pre-installed in
 your SDK. Using the tool is a key part of performing the initial setup of your
 SDK, as well as keeping it up-to-date with the latest platforms, tools, and
 other components. </p>

 <p style="margin-top:.75em;">For full instructions on how to use the tool, see
 <a href="/sdk/adding-components.html#installingComponents">Adding SDK
 Components</a>.</p>
 </div>
 </div>

 <p>The Android SDK uses a modular structure that separates the major parts of
 the SDK &mdash; platforms, add-ons, tools, and the API documentation &mdash;
 into a set of separately installable components. The SDK components are
 available to you for individual download, as needed, from the Android SDK
 repository site. </p>

 <p>The Android SDK starter package includes only a single component: the latest
 version of the SDK Tools. Included in that component is a tool called <em>Android
 SDK and AVD Manager</em> that you can use to download other components from the SDK
 repository site. The tool provides a graphical UI that lets you browse the
 repository, select new or updated components for download, and then install them
 in your SDK. </p>

 <p>There are several types of SDK components available:</p>

 <ul>
 <li><strong>SDK Tools</strong> (available pre-installed in the Android SDK
 package) &mdash; Contains the full set of SDK tools for developing, debugging,
 and testing your application code and UI. You can read about the tools in the <a
 href="{@docRoot}guide/developing/tools/index.html">Dev Guide</a> and access them
 in the <code>&lt;sdk&gt;/tools/</code> directory. </li>

 <li><strong>Android platforms</strong> &mdash; An SDK platform component is
 available for every production Android platform deployable to Android-powered
 devices. Each platform component includes a fully compliant Android library and
 system image, sample code, emulator skins, and any version specific tools. For
 detailed information about each platform, see the overview documents available
 under the section "Downloadable SDK Components," at left. </li>

 <li><strong>SDK Add-Ons</strong> &mdash; SDK add-ons provide a development
 environment for specific Android external
 library or a customized (but fully compliant) Android system image.  The Android
 SDK repository offers the Google APIs Add-On, which gives your application
 access to powerful mapping capabilities through the
 <code>com.google.android.maps</code> library. You can also add additional
 repositories, so that you can download other SDK add-ons, where available. </li>

 <li><strong>Documentation</strong> &mdash; Contains a local copy of the latest
 multiversion documentation for the Android framework API.
 </li>
 </ul>

 <p>To develop <em>any</em> Android application, even if you are following the <a
 href="{@docRoot}guide/tutorials/hello-world.html">Hello World</a> tutorial, you
 <strong>must download at least one Android platform</strong> into your SDK.
 Typically, you will want to download multiple platforms, so that you can build
 your application on the lowest version you want to support, but test against
 higher versions that you intend the application to run on. You can test your
 applications on different platforms by running in an
 Android Virtual Device (AVD) on the Android emulator. </p>

 <p>For step-by-step instructions on how to use the Android SDK and AVD Manager
 to add components, see the <a href="{@docRoot}sdk/adding-components.html">Adding
 SDK Components</a> document. </p>

 <p>For release notes and other detailed information about individual SDK
 components, see the documents listed under "Downloadable SDK Components" in
 the navigation at left.</p>


 <h2 id="sdkContents">Explore the SDK</h2>

 <p>Once you've installed the SDK and downloaded the platforms, documentation,
 and add-ons that you need, open the SDK directory and take a look at what's
 inside.</p>

 <p>The table below describes the full SDK directory contents, with components
 installed. </p>

 <table>
 <tr>
 <th colspan="3">Name</th><th>Description</th>
 </tr>
 <tr>
 <td colspan="3"><code>add-ons/</code></td>
 <td>Contains add-ons to the Android SDK development
 environment, which let you develop against external libraries that are available on some
 devices. </td>
 </tr>
 <tr>
 <td colspan="3"><code>docs/</code></td>
 <td>A full set of documentation in HTML format, including the Developer's Guide,
 API Reference, and other information. To read the documentation, load the
 file <code>offline.html</code> in a web browser.</td>
 </tr>
 <tr>
 <td colspan="3"><code>platforms/</code></td>
 <td>Contains a set of Android platform versions that you can develop
 applications against, each in a separate directory.  </td>
 </tr>
 <tr>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td colspan="2"><code>&lt;platform&gt;/</code></td>
 <td>Platform version directory, for example "Android 1.6". All platform version
 directories contain a similar set of files and subdirectory structure.</td>
 </tr>

 <tr>
 <td style="width:2em;border-bottom-color:white;">&nbsp;</td>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td><code>data/</code></td>
 <td>Storage area for default fonts and resource definitions.</td>
 </tr>
 <tr>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td><code>images/</code></td>
 <td>Storage area for default disk images, including the Android system image,
 the default userdata image, the default ramdisk image, and more. The images
 are used in emulator sessions.</td>
 </tr>
 <tr>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td><code>samples/</code></td>
 <td>Contains a wide variety of sample applications that you can load as projects
 into your development environment, compile, and run on the emulator.</td>
 </tr>
 <tr>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td><code>skins/</code></td>
 <td>A set of emulator skins available for the platform version. Each skin is
 designed for a specific screen resolution.</td>
 </tr>
 <tr>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td><code>templates/</code></td>
 <td>Storage area for file templates used by the SDK development tools.</td>
 </tr>
 <tr>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td style="width:2em;border-bottom-color:white;"></td>
 <td><code>tools/</code></td>
 <td>Any development tools that are specific to the platform version.</td>
 </tr>
 <tr>
 <td style="width:2em;"></td>
 <td style="width:2em;"></td>
 <td><code>android.jar</code></td>
 <td>The Android library used when compiling applications against this platform
 version.</td>
 </tr>
 <tr>
 <td colspan="3"><code>tools/</code></td>
 <td>Contains the set of development and profiling tools available to you, such
 as the emulator, the <code>android</code> tool, adb, ddms, and more.</td>
 </tr>
 <tr>
 <td colspan="3"><code>SDK Readme.txt</code></td>
 <td>A file that explains how to perform the initial setup of your SDK,
 including how to launch the Android SDK and AVD Manager tool on all
 platforms</td>
 </tr>
 <tr>
 <td colspan="3"><code>SDK Setup.exe</code></td>
 <td>For Windows SDK only. A shortcut that launches the Android SDK and AVD
 Manager tool, which you use to add components to your SDK. </td>
 </tr>
 <!--<tr>
 <td colspan="3"><code>documentation.html</code></td>
 <td>A file that loads the entry page for the local Android SDK
 documentation.</td>
 </tr>-->

 </table>

 <h2 id="NextSteps">Next Steps</h2>
 <p>Once you have completed installation, you are ready to
 begin developing applications. Here are a few ways you can get started: </p>

 <p><strong>Learn about Android</strong></p>
 <ul>
   <li>Take a look at the <a href="{@docRoot}guide/index.html">Dev
   Guide</a> and the types of information it provides</li>
   <li>Read an introduction to Android as a platform in <a
   href="{@docRoot}guide/basics/what-is-android.html">What is
   Android?</a></li>
   <li>Learn about the Android framework and how applications run on it in
   <a href="{@docRoot}guide/topics/fundamentals.html">Application
   Fundamentals</a></li>
   <li>Take a look at the Android framework API specification in the <a
   href="{@docRoot}reference/packages.html">Reference</a> tab</li>
 </ul>

 <p><strong>Explore the SDK</strong></p>
 <ul>
   <li>Get an overview of the <a
   href="{@docRoot}guide/developing/tools/index.html">development
   tools</a> that are available to you</li>
   <li>Read how to develop <a
   href="{@docRoot}guide/developing/eclipse-adt.html">in Eclipse/ADT</a> or
   <a href="{@docRoot}guide/developing/other-ide.html">in other IDEs</a>
   </li>
 </ul>

 <p><strong>Explore some code</strong></p>
 <ul>
   <li>Set up a <a href="{@docRoot}guide/tutorials/hello-world.html">Hello
   World application</a> (highly recommended, especially for Eclipse users)</li>
   <li>Follow the <a href="{@docRoot}guide/tutorials/notepad/index.html">
   Notepad Tutorial</a> to build a full Android application </li>
   <li>Create a new project for one of the other sample applications
   included in <code><em>&lt;sdk&gt;</em>/platforms/<em>&lt;platform&gt;</em>/samples</code>,
   then compile and run it in your development environment</li>
 </ul>

 <p><strong>Visit the Android developer groups</strong></p>
 <ul>
   <li>Take a look at the <a
   href="{@docRoot}community/index.html">Community</a> tab to see a list of
   Android developers groups. In particular, you might want to look at the
   <a href="http://groups.google.com/group/android-developers">Android
   Developers</a> group to get a sense for what the Android developer
   community is like.</li>
 </ul>


 <h2 id="troubleshooting">Installation Troubleshooting</h2>

 <h3>Ubuntu Linux Notes</h3>

 <ul>
   <li>If you need help installing and configuring Java on your
     development machine, you might find these resources helpful:
     <ul>
       <li><a href="https://help.ubuntu.com/community/Java">https://help.ubuntu.com/community/Java </a></li>
       <li><a href="https://help.ubuntu.com/community/Java">https://help.ubuntu.com/community/JavaInstallation</a></li>
     </ul>
   </li>
   <li>Here are the steps to install Java and Eclipse, prior to installing
   the Android SDK and ADT Plugin.
     <ol>
       <li>If you are running a 64-bit distribution on your development
       machine, you need to install the <code>ia32-libs</code> package using
       <code>apt-get:</code>:
       <pre>apt-get install ia32-libs</pre>
       </li>
       <li>Next, install Java: <pre>apt-get install sun-java6-bin</pre></li>
       <li>The Ubuntu package manager does not currently offer an Eclipse 3.3
       version for download, so we recommend that you download Eclipse from
       eclipse.org (<a
       href="http://www.eclipse.org/downloads/">http://www.eclipse.org/
       downloads/</a>). A Java or RCP version of Eclipse is recommended.</li>
       <li>Follow the steps given in previous sections to install the SDK
       and the ADT plugin. </li>
     </ol>
   </li>
 </ul>

 <h3>Other Linux Notes</h3>

 <ul>
   <li>If JDK is already installed on your development computer, please
   take a moment to make sure that it meets the version requirements listed
   in the <a href="requirements.html">System Requirements</a>.
   In particular, note that some Linux distributions may include JDK 1.4 or Gnu
   Compiler for Java, both of which are not supported for Android development.</li>
 </ul>
	page.title=Installing the Android SDK
	sdk.preview=0

	@jd:body

	<div id="qv-wrapper">
	<div id="qv">

	<h2>In this document</h2>
	<ol>
	<li><a href="#Preparing">Prepare for Installation</a></li>
	<li><a href="#Installing">Install the SDK</a></li>
	<li><a href="#InstallingADT">Install the ADT Plugin for Eclipse</a></li>
	<li><a href="#components">Add Platforms and Other SDK Components</a></li>
	<li><a href="#sdkContents">Explore the SDK</a></li>
	<li><a href="#NextSteps">Next Steps</a></li>
	<li><a href="#troubleshooting">Troubleshooting</a></li>
	</ol>

	<h2>See also</h2>
	<ol>
	<li><a href="{@docRoot}sdk/eclipse-adt.html">Installing ADT</a></li>
	<li><a href="{@docRoot}sdk/adding-components.html">Adding SDK Components</a></li>
	</ol>

	</div>
	</div>

	<p>This page describes how to install the Android SDK and set up your
	development environment for the first time.</p>

	<p>If you encounter any problems during installation, see the
	<a href="#troubleshooting">Troubleshooting</a> section at the bottom of
	this page.</p>

	<h4>Updating?</h4>

	<p>If you are currently using the Android 1.6 SDK, you do not necessarily need
	to install the new SDK, since your existing SDK already includes the Android SDK
	and AVD Manager tool. To develop against the new Android 2.0 platform, for
	example, you could just download the updated SDK Tools (Revision 3) and the
	Android 2.0 platform into your existing SDK.</p>

	<p>If you are using Android 1.5 SDK or older, you should install the new SDK as
	described in this document and move your application projects to the new
	environment. </p>

	<h2 id="Preparing">Prepare for Installation</h2>

	<p>Before you begin, take a moment to confirm that your development machine
	meets the <a href="requirements.html">System Requirements</a>.</p>

	<p>If you will be developing in Eclipse with the Android Development
	Tools (ADT) Plugin — the recommended path if you are new to
	Android — make sure that you have a suitable version of Eclipse
	installed on your computer (3.4 or newer is recommended). If you need
	to install Eclipse, you can download it from this location: </p>

	<p style="margin-left:2em;"><a href=
	"http://www.eclipse.org/downloads/">http://www.eclipse.org/downloads/</a></p>

	<p>A Java or RCP version of Eclipse is recommended. For Eclipse 3.5, the
	"Eclipse Classic" version is recommended.</p>

	<h2 id="Installing">Download and Install the SDK</h2>

	<p>Download the SDK package that is appropriate for your development computer.
	Unpack the Android SDK archive to a suitable location on your machine. By
	default, the SDK files are unpacked into a directory named
	<code>android-sdk-<machine-platform></code>. </p>

	<p>Make a note of the name and location of the unpacked SDK directory on your
	system — you will need to refer to the SDK directory later, when setting
	up the ADT plugin or when using the SDK tools.</p>

	<p>Optionally, you may want to add the location of the SDK's primary
	<code>tools</code> directory to your system <code>PATH</code>. The primary
	<code>tools/</code> directory is located at the root of the SDK folder. Adding
	<code>tools</code> to your path lets you run Android Debug Bridge (adb) and the
	other command line <a
	href="{@docRoot}guide/developing/tools/index.html">tools</a> without needing to
	supply the full path to the tools directory. </p>

	<ul>
	<li>On Linux, edit your <code>~/.bash_profile</code> or <code>~/.bashrc</code> file. Look
	for a line that sets the PATH environment variable and add the
	full path to the <code>tools/</code> directory to it. If you don't
	see a line setting the path, you can add one:</li>

	<ul><code>export PATH=${PATH}:<em><your_sdk_dir></em>/tools</code></ul>

	<li>On a Mac OS X, look in your home directory for <code>.bash_profile</code> and
	proceed as for Linux. You can create the <code>.bash_profile</code> if
	you haven't already set one up on your machine. </li>

	<li>On Windows, right-click on My Computer, and select Properties.
	Under the Advanced tab, hit the Environment Variables button, and in the
	dialog that comes up, double-click on Path (under System Variables). Add the full path to the
	<code>tools/</code> directory to the path. </li>
	</ul>

	<p>If you will be using the Eclipse IDE as your development environment,
	the next section describes how to install the Android Development Tools (ADT) plugin and set up Eclipse.
	If you choose not to use Eclipse, you can
	develop Android applications in an IDE of your choice and then compile, debug and deploy using
	the tools included in the SDK (skip to <a href="#NextSteps">Next Steps</a>).</p>


	<h2 id="InstallingADT">Install the ADT Plugin for Eclipse</h2>

	<p>Android offers a custom plugin for the Eclipse IDE, called Android
	Development Tools (ADT), that is designed to give you a powerful,
	integrated environment in which to build Android applications. It
	extends the capabilites of Eclipse to let you quickly set up new Android
	projects, create an application UI, add components based on the Android
	Framework API, debug your applications using the Android SDK tools, and even export
	signed (or unsigned) APKs in order to distribute your application.</p>

	<p>In general, using Eclipse with ADT is a highly recommended approach to
	Android development and is the fastest way to get started. For complete
	information about how to install ADT, see
	<a href="{@docRoot}sdk/eclipse-adt.html">Installing and Updating ADT</a>.</p>

	<p>If you prefer to work in an IDE other than Eclipse, you do not need to
	install Eclipse or ADT, instead, you can directly use the SDK tools to build and
	debug your application.</p>


	<h2 id="components">Add Android Platforms and Other Components</h2>

	<div class="sidebox-wrapper">
	<div class="sidebox">
	<p>The <strong>Android SDK and AVD Manager</strong> tool is pre-installed in
	your SDK. Using the tool is a key part of performing the initial setup of your
	SDK, as well as keeping it up-to-date with the latest platforms, tools, and
	other components. </p>

	<p style="margin-top:.75em;">For full instructions on how to use the tool, see
	<a href="/sdk/adding-components.html#installingComponents">Adding SDK
	Components</a>.</p>
	</div>
	</div>

	<p>The Android SDK uses a modular structure that separates the major parts of
	the SDK — platforms, add-ons, tools, and the API documentation —
	into a set of separately installable components. The SDK components are
	available to you for individual download, as needed, from the Android SDK
	repository site. </p>

	<p>The Android SDK starter package includes only a single component: the latest
	version of the SDK Tools. Included in that component is a tool called <em>Android
	SDK and AVD Manager</em> that you can use to download other components from the SDK
	repository site. The tool provides a graphical UI that lets you browse the
	repository, select new or updated components for download, and then install them
	in your SDK. </p>

	<p>There are several types of SDK components available:</p>

	<ul>
	<li><strong>SDK Tools</strong> (available pre-installed in the Android SDK
	package) — Contains the full set of SDK tools for developing, debugging,
	and testing your application code and UI. You can read about the tools in the <a
	href="{@docRoot}guide/developing/tools/index.html">Dev Guide</a> and access them
	in the <code><sdk>/tools/</code> directory. </li>

	<li><strong>Android platforms</strong> — An SDK platform component is
	available for every production Android platform deployable to Android-powered
	devices. Each platform component includes a fully compliant Android library and
	system image, sample code, emulator skins, and any version specific tools. For
	detailed information about each platform, see the overview documents available
	under the section "Downloadable SDK Components," at left. </li>

	<li><strong>SDK Add-Ons</strong> — SDK add-ons provide a development
	environment for specific Android external
	library or a customized (but fully compliant) Android system image. The Android
	SDK repository offers the Google APIs Add-On, which gives your application
	access to powerful mapping capabilities through the
	<code>com.google.android.maps</code> library. You can also add additional
	repositories, so that you can download other SDK add-ons, where available. </li>

	<li><strong>Documentation</strong> — Contains a local copy of the latest
	multiversion documentation for the Android framework API.
	</li>
	</ul>

	<p>To develop <em>any</em> Android application, even if you are following the <a
	href="{@docRoot}guide/tutorials/hello-world.html">Hello World</a> tutorial, you
	<strong>must download at least one Android platform</strong> into your SDK.
	Typically, you will want to download multiple platforms, so that you can build
	your application on the lowest version you want to support, but test against
	higher versions that you intend the application to run on. You can test your
	applications on different platforms by running in an
	Android Virtual Device (AVD) on the Android emulator. </p>

	<p>For step-by-step instructions on how to use the Android SDK and AVD Manager
	to add components, see the <a href="{@docRoot}sdk/adding-components.html">Adding
	SDK Components</a> document. </p>

	<p>For release notes and other detailed information about individual SDK
	components, see the documents listed under "Downloadable SDK Components" in
	the navigation at left.</p>


	<h2 id="sdkContents">Explore the SDK</h2>

	<p>Once you've installed the SDK and downloaded the platforms, documentation,
	and add-ons that you need, open the SDK directory and take a look at what's
	inside.</p>

	<p>The table below describes the full SDK directory contents, with components
	installed. </p>

	<table>
	<tr>
	<th colspan="3">Name</th><th>Description</th>
	</tr>
	<tr>
	<td colspan="3"><code>add-ons/</code></td>
	<td>Contains add-ons to the Android SDK development
	environment, which let you develop against external libraries that are available on some
	devices. </td>
	</tr>
	<tr>
	<td colspan="3"><code>docs/</code></td>
	<td>A full set of documentation in HTML format, including the Developer's Guide,
	API Reference, and other information. To read the documentation, load the
	file <code>offline.html</code> in a web browser.</td>
	</tr>
	<tr>
	<td colspan="3"><code>platforms/</code></td>
	<td>Contains a set of Android platform versions that you can develop
	applications against, each in a separate directory. </td>
	</tr>
	<tr>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td colspan="2"><code><platform>/</code></td>
	<td>Platform version directory, for example "Android 1.6". All platform version
	directories contain a similar set of files and subdirectory structure.</td>
	</tr>

	<tr>
	<td style="width:2em;border-bottom-color:white;"> </td>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td><code>data/</code></td>
	<td>Storage area for default fonts and resource definitions.</td>
	</tr>
	<tr>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td><code>images/</code></td>
	<td>Storage area for default disk images, including the Android system image,
	the default userdata image, the default ramdisk image, and more. The images
	are used in emulator sessions.</td>
	</tr>
	<tr>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td><code>samples/</code></td>
	<td>Contains a wide variety of sample applications that you can load as projects
	into your development environment, compile, and run on the emulator.</td>
	</tr>
	<tr>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td><code>skins/</code></td>
	<td>A set of emulator skins available for the platform version. Each skin is
	designed for a specific screen resolution.</td>
	</tr>
	<tr>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td><code>templates/</code></td>
	<td>Storage area for file templates used by the SDK development tools.</td>
	</tr>
	<tr>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td style="width:2em;border-bottom-color:white;"></td>
	<td><code>tools/</code></td>
	<td>Any development tools that are specific to the platform version.</td>
	</tr>
	<tr>
	<td style="width:2em;"></td>
	<td style="width:2em;"></td>
	<td><code>android.jar</code></td>
	<td>The Android library used when compiling applications against this platform
	version.</td>
	</tr>
	<tr>
	<td colspan="3"><code>tools/</code></td>
	<td>Contains the set of development and profiling tools available to you, such
	as the emulator, the <code>android</code> tool, adb, ddms, and more.</td>
	</tr>
	<tr>
	<td colspan="3"><code>SDK Readme.txt</code></td>
	<td>A file that explains how to perform the initial setup of your SDK,
	including how to launch the Android SDK and AVD Manager tool on all
	platforms</td>
	</tr>
	<tr>
	<td colspan="3"><code>SDK Setup.exe</code></td>
	<td>For Windows SDK only. A shortcut that launches the Android SDK and AVD
	Manager tool, which you use to add components to your SDK. </td>
	</tr>
	<!--<tr>
	<td colspan="3"><code>documentation.html</code></td>
	<td>A file that loads the entry page for the local Android SDK
	documentation.</td>
	</tr>-->

	</table>

	<h2 id="NextSteps">Next Steps</h2>
	<p>Once you have completed installation, you are ready to
	begin developing applications. Here are a few ways you can get started: </p>

	<p><strong>Learn about Android</strong></p>
	<ul>
	<li>Take a look at the <a href="{@docRoot}guide/index.html">Dev
	Guide</a> and the types of information it provides</li>
	<li>Read an introduction to Android as a platform in <a
	href="{@docRoot}guide/basics/what-is-android.html">What is
	Android?</a></li>
	<li>Learn about the Android framework and how applications run on it in
	<a href="{@docRoot}guide/topics/fundamentals.html">Application
	Fundamentals</a></li>
	<li>Take a look at the Android framework API specification in the <a
	href="{@docRoot}reference/packages.html">Reference</a> tab</li>
	</ul>

	<p><strong>Explore the SDK</strong></p>
	<ul>
	<li>Get an overview of the <a
	href="{@docRoot}guide/developing/tools/index.html">development
	tools</a> that are available to you</li>
	<li>Read how to develop <a
	href="{@docRoot}guide/developing/eclipse-adt.html">in Eclipse/ADT</a> or
	<a href="{@docRoot}guide/developing/other-ide.html">in other IDEs</a>
	</li>
	</ul>

	<p><strong>Explore some code</strong></p>
	<ul>
	<li>Set up a <a href="{@docRoot}guide/tutorials/hello-world.html">Hello
	World application</a> (highly recommended, especially for Eclipse users)</li>
	<li>Follow the <a href="{@docRoot}guide/tutorials/notepad/index.html">
	Notepad Tutorial</a> to build a full Android application </li>
	<li>Create a new project for one of the other sample applications
	included in <code><em><sdk></em>/platforms/<em><platform></em>/samples</code>,
	then compile and run it in your development environment</li>
	</ul>

	<p><strong>Visit the Android developer groups</strong></p>
	<ul>
	<li>Take a look at the <a
	href="{@docRoot}community/index.html">Community</a> tab to see a list of
	Android developers groups. In particular, you might want to look at the
	<a href="http://groups.google.com/group/android-developers">Android
	Developers</a> group to get a sense for what the Android developer
	community is like.</li>
	</ul>


	<h2 id="troubleshooting">Installation Troubleshooting</h2>

	<h3>Ubuntu Linux Notes</h3>

	<ul>
	<li>If you need help installing and configuring Java on your
	development machine, you might find these resources helpful:
	<ul>
	<li><a href="https://help.ubuntu.com/community/Java">https://help.ubuntu.com/community/Java </a></li>
	<li><a href="https://help.ubuntu.com/community/Java">https://help.ubuntu.com/community/JavaInstallation</a></li>
	</ul>
	</li>
	<li>Here are the steps to install Java and Eclipse, prior to installing
	the Android SDK and ADT Plugin.
	<ol>
	<li>If you are running a 64-bit distribution on your development
	machine, you need to install the <code>ia32-libs</code> package using
	<code>apt-get:</code>:
	<pre>apt-get install ia32-libs</pre>
	</li>
	<li>Next, install Java: <pre>apt-get install sun-java6-bin</pre></li>
	<li>The Ubuntu package manager does not currently offer an Eclipse 3.3
	version for download, so we recommend that you download Eclipse from
	eclipse.org (<a
	href="http://www.eclipse.org/downloads/">http://www.eclipse.org/
	downloads/</a>). A Java or RCP version of Eclipse is recommended.</li>
	<li>Follow the steps given in previous sections to install the SDK
	and the ADT plugin. </li>
	</ol>
	</li>
	</ul>

	<h3>Other Linux Notes</h3>

	<ul>
	<li>If JDK is already installed on your development computer, please
	take a moment to make sure that it meets the version requirements listed
	in the <a href="requirements.html">System Requirements</a>.
	In particular, note that some Linux distributions may include JDK 1.4 or Gnu
	Compiler for Java, both of which are not supported for Android development.</li>
	</ul>