docs/html/tools/building/building-cmdline-ant.jd - LeafOS-Project/android_frameworks_base - Gitiles

 page.title=Building and Running from the Command Line
 parent.title=Building and Running
 parent.link=index.html
 @jd:body

  <div id="qv-wrapper">
     <div id="qv">
       <h2>In this document</h2>
       <ol>
         <li><a href="#DebugMode">Building in Debug Mode</a></li>
         <li><a href="#ReleaseMode">Building in Release Mode</a>
           <ol>
             <li><a href="#ManualReleaseMode">Build unsigned</a></li>
             <li><a href="#AutoReleaseMode">Build signed and aligned</a></li>
             <li><a href="#OnceBuilt">Once built and signed in release mode</a></li>
           </ol>
         </li>
         <li><a href="#RunningOnEmulator">Running on the Emulator</a></li>
         <li><a href="#RunningOnDevice">Running on a Device</a></li>
         <li><a href="#Signing">Application Signing</a></li>
         <li><a href="#AntReference">Ant Command Reference</a></li>
       </ol>
   <h2>See also</h2>
   <ol>
     <li><a href="{@docRoot}tools/devices/managing-avds-cmdline.html">Managing AVDs from
 the Command Line</a></li>
     <li><a href="{@docRoot}tools/devices/emulator.html">Using the Android
 Emulator</a></li>
     <li><a href="{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a></li>
   </ol>
     </div>
   </div>

 <p class="caution">
   <strong>Important:</strong> Support for Ant as a build tool for Android is ending, per our
   <a href="http://android-developers.blogspot.com/2015/06/an-update-on-eclipse-android-developer.html"
   class="external-link">announcement</a>. You should migrate your app development projects to
   Android Studio and Gradle as soon as possible. For more information on transitioning to these
   tools, see <a href="{@docRoot}sdk/installing/migrate.html">Migrating to Android Studio</a>.
 </p>

   <p>There are two ways to build your application using the Ant build script: one for
   testing/debugging your application &mdash; <em>debug mode</em> &mdash; and one for building your
   final package for release &mdash; <em>release mode</em>. Regardless of which way you build your application,
   it must be signed before it can install on an emulator or device&mdash;with a debug key when building
   in debug mode and with your own private key when building in release mode.</p>

   <p>Whether you're building in debug mode or release mode, you need to use the Ant tool to compile
   and build your project. This will create the .apk file that you can install on an emulator or device.
   When you build in debug mode, the .apk file is automatically signed by the SDK tools with
   a debug key, so it's instantly ready for installation onto an emulator or attached
   development device. You cannot distribute an application that is signed with a debug key.
   When you build in release mode, the .apk file is <em>unsigned</em>, so you
   must manually sign it with your own private key, using Keytool and Jarsigner.</p>

   <p>It's important that you read and understand <a href=
   "{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a>, particularly once
   you're ready to release your application and share it with end-users. That document describes the
   procedure for generating a private key and then using it to sign your .apk file. If you're just
   getting started, however, you can quickly run your applications on an emulator or your own
   development device by building in debug mode.</p>

   <p>If you don't have Ant, you can obtain it from the <a href="http://ant.apache.org/">Apache Ant
   home page</a>. Install it and make sure it is in your executable PATH. Before calling Ant, you
   need to declare the JAVA_HOME environment variable to specify the path to where the JDK is
   installed.</p>

   <p class="note"><strong>Note:</strong> When installing JDK on Windows, the default is to install
   in the "Program Files" directory. This location will cause <code>ant</code> to fail, because of
   the space. To fix the problem, you can specify the JAVA_HOME variable like this:
   <pre>set JAVA_HOME=c:\Progra~1\Java\&lt;jdkdir&gt;</pre>

   <p>The easiest solution, however, is to install JDK in a non-space directory, for example:</p>

   <pre>c:\java\jdk1.7</pre>

   <h2 id="DebugMode">Building in Debug Mode</h2>

   <p>For immediate application testing and debugging, you can build your application in debug mode
   and immediately install it on an emulator. In debug mode, the build tools automatically sign your
   application with a debug key and optimize the package with {@code zipalign}.</p>

   <p>To build in debug mode:</p>

   <ol>
     <li>Open a command-line and navigate to the root of your project directory.</li>
     <li>Use Ant to compile your project in debug mode:
       <pre>
 ant debug
 </pre>

       <p>This creates your debug <code>.apk</code> file inside the project <code>bin/</code> directory, named
       <code>&lt;your_project_name&gt;-debug.apk</code>. The file is already signed with
       the debug key and has been aligned with
       <a href="{@docRoot}tools/help/zipalign.html"><code>zipalign</code></a>.
       </p>
     </li>
   </ol>

   <p>Each time you change a source file or resource, you must run Ant again in order to package up
   the latest version of the application.</p>

   <p>To install and run your application on an emulator, see the following section about <a href=
   "#RunningOnEmulator">Running on the Emulator</a>.</p>

   <h2 id="ReleaseMode">Building in Release Mode</h2>

   <p>When you're ready to release and distribute your application to end-users, you must build your
   application in release mode. Once you have built in release mode, it's a good idea to perform
   additional testing and debugging with the final .apk.</p>

   <p>Before you start building your application in release mode, be aware that you must sign the
   resulting application package with your private key, and should then align it using the {@code
   zipalign} tool. There are two approaches to building in release mode: build an unsigned package
   in release mode and then manually sign and align the package, or allow the build script to sign
   and align the package for you.</p>

   <h3 id="ManualReleaseMode">Build unsigned</h3>

   <p>If you build your application <em>unsigned</em>, then you will need to manually sign and align
   the package.</p>

   <p>To build an <em>unsigned</em> .apk in release mode:</p>

   <ol>
     <li>Open a command-line and navigate to the root of your project directory.</li>

     <li>Use Ant to compile your project in release mode:
       <pre>
 ant release
 </pre>
     </li>
   </ol>

   <p>This creates your Android application .apk file inside the project <code>bin/</code>
   directory, named <code><em>&lt;your_project_name&gt;</em>-unsigned.apk</code>.</p>

   <p class="note"><strong>Note:</strong> The .apk file is <em>unsigned</em> at this point and can't
   be installed until signed with your private key.</p>

   <p>Once you have created the unsigned .apk, your next step is to sign the .apk with your private
   key and then align it with {@code zipalign}. To complete this procedure, read <a href=
   "{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a>.</p>

   <p>When your <code>.apk</code> has been signed and aligned, it's ready to be distributed to end-users.
   You should test the final build on different devices or AVDs to ensure that it
   runs properly on different platforms.</p>

   <h3 id="AutoReleaseMode">Build signed and aligned</h3>

   <p>If you would like, you can configure the Android build script to automatically sign and align
   your application package. To do so, you must provide the path to your keystore and the name of
   your key alias in your project's {@code ant.properties} file. With this information provided,
   the build script will prompt you for your keystore and alias password when you build in release
   mode and produce your final application package, which will be ready for distribution.</p>

   <p class="caution"><strong>Caution:</strong> Due to the way Ant handles input, the password that
   you enter during the build process <strong>will be visible</strong>. If you are concerned about
   your keystore and alias password being visible on screen, then you may prefer to perform the
   application signing manually, via Jarsigner (or a similar tool). To instead perform the signing
   procedure manually, <a href="#ManualReleaseMode">build unsigned</a> and then continue with
   <a href="{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a>.</p>

   <p>To specify your keystore and alias, open the project {@code ant.properties} file (found in
   the root of the project directory) and add entries for {@code key.store} and {@code key.alias}.
   For example:</p>
   <pre>
 key.store=path/to/my.keystore
 key.alias=mykeystore
 </pre>

   <p>Save your changes. Now you can build a <em>signed</em> .apk in release mode:</p>

   <ol>
     <li>Open a command-line and navigate to the root of your project directory.</li>

     <li>Use Ant to compile your project in release mode:
       <pre>
 ant release
 </pre>
     </li>

     <li>When prompted, enter you keystore and alias passwords.

       <p class="caution"><strong>Caution:</strong> As described above, your password will be
       visible on the screen.</p>
     </li>
   </ol>

   <p>This creates your Android application .apk file inside the project <code>bin/</code>
   directory, named <code><em>&lt;your_project_name&gt;</em>-release.apk</code>. This .apk file has
   been signed with the private key specified in {@code ant.properties} and aligned with {@code
   zipalign}. It's ready for installation and distribution.</p>

   <h3 id="OnceBuilt">Once built and signed in release mode</h3>

   <p>Once you have signed your application with a private key, you can install and run it on an
   <a href="#RunningOnEmulator">emulator</a> or <a href="#RunningOnDevice">device</a>. You can
   also try installing it onto a device from a web server. Simply upload the signed .apk to a web
   site, then load the .apk URL in your Android web browser to download the application and begin
   installation. (On your device, be sure you have enabled
   <em>Settings &gt; Applications &gt; Unknown sources</em>.)</p>

   <h2 id="RunningOnEmulator">Running on the Emulator</h2>

   <p>Before you can run your application on the Android Emulator, you must <a href=
   "{@docRoot}tools/devices/managing-avds.html">create an AVD</a>.</p>

   <p>To run your application:</p>

   <ol>
     <li>
       <strong>Open the AVD Manager and launch a virtual device</strong>

       <p>From your SDK's <code>platform-tools/</code> directory, execute the {@code android} tool
 with the <code>avd</code> options:</p>
       <pre>
 android avd
 </pre>

       <p>In the <em>Virtual Devices</em> view, select an AVD and click <strong>Start</strong>.</p>
     </li>

     <li>
       <strong>Install your application</strong>

       <p>From your SDK's <code>tools/</code> directory, install the {@code .apk} on the
       emulator:</p>
       <pre>
 adb install <em>&lt;path_to_your_bin&gt;</em>.apk
 </pre>

       <p>Your .apk file (signed with either a release or debug key) is in your project {@code bin/}
       directory after you build your application.</p>

       <p>If there is more than one emulator running, you must specify the emulator upon which to
       install the application, by its serial number, with the <code>-s</code> option. For
       example:</p>
       <pre>
 adb -s emulator-5554 install <em>path/to/your/app</em>.apk
 </pre>

       <p>To see a list of available device serial numbers, execute {@code adb devices}.</p>
     </li>
   </ol>

   <p>If you don't see your application on the emulator, try closing the emulator and launching the
   virtual device again from the AVD Manager. Sometimes when you install an application for the
   first time, it won't show up in the application launcher or be accessible by other applications.
   This is because the package manager usually examines manifests completely only on emulator
   startup.</p>

   <p>Be certain to create multiple AVDs upon which to test your application. You should have one
   AVD for each platform and screen type with which your application is compatible. For instance, if
   your application compiles against the Android 4.0 (API Level 14) platform, you should create an
   AVD for each platform equal to and greater than 4.0 and an AVD for each <a href=
   "{@docRoot}guide/practices/screens_support.html">screen type</a> you support, then test your
   application on each one.</p>

   <p class="note"><strong>Tip:</strong> If you have <em>only one</em> emulator running, you can
   build your application and install it on the emulator in one simple step. Navigate to the root of
   your project directory and use Ant to compile the project with <em>install mode</em>: <code>ant
   install</code>. This will build your application, sign it with the debug key, and install it on
   the currently running emulator.</p>

   <h2 id="RunningOnDevice">Running on a Device</h2>

   <p>Before you can run your application on a device, you must perform some basic setup for your
   device:</p>

   <ul>
     <li>Enable <strong>USB debugging</strong> on your device.
       <ul>
         <li>On most devices running Android 3.2 or older, you can find the option under
           <strong>Settings > Applications > Development</strong>.</li>
         <li>On Android 4.0 and newer, it's in <strong>Settings > Developer options</strong>.
           <p class="note"><strong>Note:</strong> On Android 4.2 and newer, <strong>Developer
           options</strong> is hidden by default. To make it available, go
           to <strong>Settings > About phone</strong> and tap <strong>Build number</strong>
           seven times. Return to the previous screen to find <strong>Developer options</strong>.</p>
         </li>
       </ul>
     </li>

     <li>Ensure that your development computer can detect your device when connected via USB</li>
   </ul>

   <p>Read <a href="{@docRoot}tools/device.html#setting-up">Setting up a Device for
   Development</a> for more information.</p>

   <p>Once your device is set up and connected via USB, navigate to your SDK's <code>platform-tools/</code>
   directory and install the <code>.apk</code> on the device:</p>
   <pre>
 adb -d install <em>path/to/your/app</em>.apk
 </pre>

   <p>The {@code -d} flag specifies that you want to use the attached device (in case you also have
   an emulator running).</p>

   <p>For more information on the tools used above, please see the following documents:</p>

   <ul>
     <li><a href="{@docRoot}tools/help/android.html">android Tool</a></li>

     <li><a href="{@docRoot}tools/devices/emulator.html">Android Emulator</a></li>

     <li><a href="{@docRoot}tools/help/adb.html">Android Debug Bridge</a> (ADB)</li>
   </ul>

   <h2 id="Signing">Application Signing</h2>

   <p>As you begin developing Android applications, understand that all Android applications must be
   digitally signed before the system will install them on an emulator or device. There are two ways
   to do this: with a <em>debug key</em> (for immediate testing on an emulator or development
   device) or with a <em>private key</em> (for application distribution).</p>

   <p>The Android build tools help you get started by automatically signing your .apk files with a
   debug key at build time. This means that you can compile your application and install it on the
   emulator without having to generate your own private key. However, please note that if you intend
   to publish your application, you <strong>must</strong> sign the application with your own private
   key, rather than the debug key generated by the SDK tools.</p>

   <p>The ADT plugin helps you get started quickly by signing your .apk files with a debug key,
   prior to installing them on an emulator or development device. This means that you can quickly
   run your application from Eclipse without having to generate your own private key. No specific
   action on your part is needed, provided ADT has access to Keytool. However, please note that if
   you intend to publish your application, you <strong>must</strong> sign the application with your
   own private key, rather than the debug key generated by the SDK tools.</p>

   <p>Please read <a href="{@docRoot}tools/publishing/app-signing.html">Signing Your
   Applications</a>, which provides a thorough guide to application signing on Android and what it
   means to you as an Android application developer. The document also includes a guide to exporting
   and signing your application with the ADT's Export Wizard.</p>

   <h2 id="AntReference">Ant Command Reference</h2>
   <dt><code>ant clean</code></dt>
   <dd>Cleans the project. If you include the <code>all</code> target before <code>clean</code>
 (<code>ant all clean</code>), other projects are also cleaned. For instance if you clean a
 test project, the tested project is also cleaned.</dd>

   <dt><code>ant debug</code></dt>
   <dd>Builds a debug package. Works on application, library, and test projects and compiles
   dependencies as  needed.</dd>

   <dt id="emma"><code>ant emma debug</code></dt>
   <dd>Builds a test project while building the tested project with instrumentation turned on.
   This is used to run tests with code coverage enabled.</dd>

   <dt><code>ant release</code></dt>
   <dd>Builds a release package.</dd>

   <dt><code>ant instrument</code>
   </dt>
   <dd>Builds an instrumented debug package. This is generally called automatically when building a
   test project with code coverage enabled (with the <code>emma</code>
   target)</dd>

   <dt><code>ant &lt;build_target&gt; install</code></dt>
   <dd>Builds and installs a package. Using <code>install</code> by itself fails.</dd>

   <dt><code>ant installd</code></dt>
   <dd>Installs an already compiled debug package. This fails if the <code>.apk</code> is not
   already built.</dd>

   <dt><code>ant installr</code></dt>
   <dd>Installs an already compiled release package. This fails if the <code>.apk</code> is not
   already built.</dd>

   <dt><code>ant installt</code></dt>
   <dd>Installs an already compiled test package. Also installs the <code>.apk</code> of the
   tested application. This fails if the <code>.apk</code> is not already built.</dd>

   <dt><code>ant installi</code></dt>
   <dd>Installs an already compiled instrumented package. This is generally not used manually as
   it's called when installing a test package. This fails if the <code>.apk</code> is not already
   built.</dd>

    <dt><code>ant test</code></dt>
    <dd>Runs the tests (for test projects). The tested and test <code>.apk</code> files must be
    previously installed.</dd>

   <dt><code>ant debug installt test</code></dt>
   <dd>Builds a test project and the tested project, installs both <code>.apk</code> files, and
   runs the tests.</dd>

   <dt><code>ant emma debug install test</code></dt>
   <dd>Builds a test project and the tested project, installs both <code>.apk</code> files, and
   runs the tests with code coverage enabled.</dd>
	page.title=Building and Running from the Command Line
	parent.title=Building and Running
	parent.link=index.html
	@jd:body

	<div id="qv-wrapper">
	<div id="qv">
	<h2>In this document</h2>
	<ol>
	<li><a href="#DebugMode">Building in Debug Mode</a></li>
	<li><a href="#ReleaseMode">Building in Release Mode</a>
	<ol>
	<li><a href="#ManualReleaseMode">Build unsigned</a></li>
	<li><a href="#AutoReleaseMode">Build signed and aligned</a></li>
	<li><a href="#OnceBuilt">Once built and signed in release mode</a></li>
	</ol>
	</li>
	<li><a href="#RunningOnEmulator">Running on the Emulator</a></li>
	<li><a href="#RunningOnDevice">Running on a Device</a></li>
	<li><a href="#Signing">Application Signing</a></li>
	<li><a href="#AntReference">Ant Command Reference</a></li>
	</ol>
	<h2>See also</h2>
	<ol>
	<li><a href="{@docRoot}tools/devices/managing-avds-cmdline.html">Managing AVDs from
	the Command Line</a></li>
	<li><a href="{@docRoot}tools/devices/emulator.html">Using the Android
	Emulator</a></li>
	<li><a href="{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a></li>
	</ol>
	</div>
	</div>

	<p class="caution">
	<strong>Important:</strong> Support for Ant as a build tool for Android is ending, per our
	<a href="http://android-developers.blogspot.com/2015/06/an-update-on-eclipse-android-developer.html"
	class="external-link">announcement</a>. You should migrate your app development projects to
	Android Studio and Gradle as soon as possible. For more information on transitioning to these
	tools, see <a href="{@docRoot}sdk/installing/migrate.html">Migrating to Android Studio</a>.
	</p>

	<p>There are two ways to build your application using the Ant build script: one for
	testing/debugging your application — <em>debug mode</em> — and one for building your
	final package for release — <em>release mode</em>. Regardless of which way you build your application,
	it must be signed before it can install on an emulator or device—with a debug key when building
	in debug mode and with your own private key when building in release mode.</p>

	<p>Whether you're building in debug mode or release mode, you need to use the Ant tool to compile
	and build your project. This will create the .apk file that you can install on an emulator or device.
	When you build in debug mode, the .apk file is automatically signed by the SDK tools with
	a debug key, so it's instantly ready for installation onto an emulator or attached
	development device. You cannot distribute an application that is signed with a debug key.
	When you build in release mode, the .apk file is <em>unsigned</em>, so you
	must manually sign it with your own private key, using Keytool and Jarsigner.</p>

	<p>It's important that you read and understand <a href=
	"{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a>, particularly once
	you're ready to release your application and share it with end-users. That document describes the
	procedure for generating a private key and then using it to sign your .apk file. If you're just
	getting started, however, you can quickly run your applications on an emulator or your own
	development device by building in debug mode.</p>

	<p>If you don't have Ant, you can obtain it from the <a href="http://ant.apache.org/">Apache Ant
	home page</a>. Install it and make sure it is in your executable PATH. Before calling Ant, you
	need to declare the JAVA_HOME environment variable to specify the path to where the JDK is
	installed.</p>

	<p class="note"><strong>Note:</strong> When installing JDK on Windows, the default is to install
	in the "Program Files" directory. This location will cause <code>ant</code> to fail, because of
	the space. To fix the problem, you can specify the JAVA_HOME variable like this:
	<pre>set JAVA_HOME=c:\Progra~1\Java\<jdkdir></pre>

	<p>The easiest solution, however, is to install JDK in a non-space directory, for example:</p>

	<pre>c:\java\jdk1.7</pre>

	<h2 id="DebugMode">Building in Debug Mode</h2>

	<p>For immediate application testing and debugging, you can build your application in debug mode
	and immediately install it on an emulator. In debug mode, the build tools automatically sign your
	application with a debug key and optimize the package with {@code zipalign}.</p>

	<p>To build in debug mode:</p>

	<ol>
	<li>Open a command-line and navigate to the root of your project directory.</li>
	<li>Use Ant to compile your project in debug mode:
	<pre>
	ant debug
	</pre>

	<p>This creates your debug <code>.apk</code> file inside the project <code>bin/</code> directory, named
	<code><your_project_name>-debug.apk</code>. The file is already signed with
	the debug key and has been aligned with
	<a href="{@docRoot}tools/help/zipalign.html"><code>zipalign</code></a>.
	</p>
	</li>
	</ol>

	<p>Each time you change a source file or resource, you must run Ant again in order to package up
	the latest version of the application.</p>

	<p>To install and run your application on an emulator, see the following section about <a href=
	"#RunningOnEmulator">Running on the Emulator</a>.</p>

	<h2 id="ReleaseMode">Building in Release Mode</h2>

	<p>When you're ready to release and distribute your application to end-users, you must build your
	application in release mode. Once you have built in release mode, it's a good idea to perform
	additional testing and debugging with the final .apk.</p>

	<p>Before you start building your application in release mode, be aware that you must sign the
	resulting application package with your private key, and should then align it using the {@code
	zipalign} tool. There are two approaches to building in release mode: build an unsigned package
	in release mode and then manually sign and align the package, or allow the build script to sign
	and align the package for you.</p>

	<h3 id="ManualReleaseMode">Build unsigned</h3>

	<p>If you build your application <em>unsigned</em>, then you will need to manually sign and align
	the package.</p>

	<p>To build an <em>unsigned</em> .apk in release mode:</p>

	<ol>
	<li>Open a command-line and navigate to the root of your project directory.</li>

	<li>Use Ant to compile your project in release mode:
	<pre>
	ant release
	</pre>
	</li>
	</ol>

	<p>This creates your Android application .apk file inside the project <code>bin/</code>
	directory, named <code><em><your_project_name></em>-unsigned.apk</code>.</p>

	<p class="note"><strong>Note:</strong> The .apk file is <em>unsigned</em> at this point and can't
	be installed until signed with your private key.</p>

	<p>Once you have created the unsigned .apk, your next step is to sign the .apk with your private
	key and then align it with {@code zipalign}. To complete this procedure, read <a href=
	"{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a>.</p>

	<p>When your <code>.apk</code> has been signed and aligned, it's ready to be distributed to end-users.
	You should test the final build on different devices or AVDs to ensure that it
	runs properly on different platforms.</p>

	<h3 id="AutoReleaseMode">Build signed and aligned</h3>

	<p>If you would like, you can configure the Android build script to automatically sign and align
	your application package. To do so, you must provide the path to your keystore and the name of
	your key alias in your project's {@code ant.properties} file. With this information provided,
	the build script will prompt you for your keystore and alias password when you build in release
	mode and produce your final application package, which will be ready for distribution.</p>

	<p class="caution"><strong>Caution:</strong> Due to the way Ant handles input, the password that
	you enter during the build process <strong>will be visible</strong>. If you are concerned about
	your keystore and alias password being visible on screen, then you may prefer to perform the
	application signing manually, via Jarsigner (or a similar tool). To instead perform the signing
	procedure manually, <a href="#ManualReleaseMode">build unsigned</a> and then continue with
	<a href="{@docRoot}tools/publishing/app-signing.html">Signing Your Applications</a>.</p>

	<p>To specify your keystore and alias, open the project {@code ant.properties} file (found in
	the root of the project directory) and add entries for {@code key.store} and {@code key.alias}.
	For example:</p>
	<pre>
	key.store=path/to/my.keystore
	key.alias=mykeystore
	</pre>

	<p>Save your changes. Now you can build a <em>signed</em> .apk in release mode:</p>

	<ol>
	<li>Open a command-line and navigate to the root of your project directory.</li>

	<li>Use Ant to compile your project in release mode:
	<pre>
	ant release
	</pre>
	</li>

	<li>When prompted, enter you keystore and alias passwords.

	<p class="caution"><strong>Caution:</strong> As described above, your password will be
	visible on the screen.</p>
	</li>
	</ol>

	<p>This creates your Android application .apk file inside the project <code>bin/</code>
	directory, named <code><em><your_project_name></em>-release.apk</code>. This .apk file has
	been signed with the private key specified in {@code ant.properties} and aligned with {@code
	zipalign}. It's ready for installation and distribution.</p>

	<h3 id="OnceBuilt">Once built and signed in release mode</h3>

	<p>Once you have signed your application with a private key, you can install and run it on an
	<a href="#RunningOnEmulator">emulator</a> or <a href="#RunningOnDevice">device</a>. You can
	also try installing it onto a device from a web server. Simply upload the signed .apk to a web
	site, then load the .apk URL in your Android web browser to download the application and begin
	installation. (On your device, be sure you have enabled
	<em>Settings > Applications > Unknown sources</em>.)</p>

	<h2 id="RunningOnEmulator">Running on the Emulator</h2>

	<p>Before you can run your application on the Android Emulator, you must <a href=
	"{@docRoot}tools/devices/managing-avds.html">create an AVD</a>.</p>

	<p>To run your application:</p>

	<ol>
	<li>
	<strong>Open the AVD Manager and launch a virtual device</strong>

	<p>From your SDK's <code>platform-tools/</code> directory, execute the {@code android} tool
	with the <code>avd</code> options:</p>
	<pre>
	android avd
	</pre>

	<p>In the <em>Virtual Devices</em> view, select an AVD and click <strong>Start</strong>.</p>
	</li>

	<li>
	<strong>Install your application</strong>

	<p>From your SDK's <code>tools/</code> directory, install the {@code .apk} on the
	emulator:</p>
	<pre>
	adb install <em><path_to_your_bin></em>.apk
	</pre>

	<p>Your .apk file (signed with either a release or debug key) is in your project {@code bin/}
	directory after you build your application.</p>

	<p>If there is more than one emulator running, you must specify the emulator upon which to
	install the application, by its serial number, with the <code>-s</code> option. For
	example:</p>
	<pre>
	adb -s emulator-5554 install <em>path/to/your/app</em>.apk
	</pre>

	<p>To see a list of available device serial numbers, execute {@code adb devices}.</p>
	</li>
	</ol>

	<p>If you don't see your application on the emulator, try closing the emulator and launching the
	virtual device again from the AVD Manager. Sometimes when you install an application for the
	first time, it won't show up in the application launcher or be accessible by other applications.
	This is because the package manager usually examines manifests completely only on emulator
	startup.</p>

	<p>Be certain to create multiple AVDs upon which to test your application. You should have one
	AVD for each platform and screen type with which your application is compatible. For instance, if
	your application compiles against the Android 4.0 (API Level 14) platform, you should create an
	AVD for each platform equal to and greater than 4.0 and an AVD for each <a href=
	"{@docRoot}guide/practices/screens_support.html">screen type</a> you support, then test your
	application on each one.</p>

	<p class="note"><strong>Tip:</strong> If you have <em>only one</em> emulator running, you can
	build your application and install it on the emulator in one simple step. Navigate to the root of
	your project directory and use Ant to compile the project with <em>install mode</em>: <code>ant
	install</code>. This will build your application, sign it with the debug key, and install it on
	the currently running emulator.</p>

	<h2 id="RunningOnDevice">Running on a Device</h2>

	<p>Before you can run your application on a device, you must perform some basic setup for your
	device:</p>

	<ul>
	<li>Enable <strong>USB debugging</strong> on your device.
	<ul>
	<li>On most devices running Android 3.2 or older, you can find the option under
	<strong>Settings > Applications > Development</strong>.</li>
	<li>On Android 4.0 and newer, it's in <strong>Settings > Developer options</strong>.
	<p class="note"><strong>Note:</strong> On Android 4.2 and newer, <strong>Developer
	options</strong> is hidden by default. To make it available, go
	to <strong>Settings > About phone</strong> and tap <strong>Build number</strong>
	seven times. Return to the previous screen to find <strong>Developer options</strong>.</p>
	</li>
	</ul>
	</li>

	<li>Ensure that your development computer can detect your device when connected via USB</li>
	</ul>

	<p>Read <a href="{@docRoot}tools/device.html#setting-up">Setting up a Device for
	Development</a> for more information.</p>

	<p>Once your device is set up and connected via USB, navigate to your SDK's <code>platform-tools/</code>
	directory and install the <code>.apk</code> on the device:</p>
	<pre>
	adb -d install <em>path/to/your/app</em>.apk
	</pre>

	<p>The {@code -d} flag specifies that you want to use the attached device (in case you also have
	an emulator running).</p>

	<p>For more information on the tools used above, please see the following documents:</p>

	<ul>
	<li><a href="{@docRoot}tools/help/android.html">android Tool</a></li>

	<li><a href="{@docRoot}tools/devices/emulator.html">Android Emulator</a></li>

	<li><a href="{@docRoot}tools/help/adb.html">Android Debug Bridge</a> (ADB)</li>
	</ul>

	<h2 id="Signing">Application Signing</h2>

	<p>As you begin developing Android applications, understand that all Android applications must be
	digitally signed before the system will install them on an emulator or device. There are two ways
	to do this: with a <em>debug key</em> (for immediate testing on an emulator or development
	device) or with a <em>private key</em> (for application distribution).</p>

	<p>The Android build tools help you get started by automatically signing your .apk files with a
	debug key at build time. This means that you can compile your application and install it on the
	emulator without having to generate your own private key. However, please note that if you intend
	to publish your application, you <strong>must</strong> sign the application with your own private
	key, rather than the debug key generated by the SDK tools.</p>

	<p>The ADT plugin helps you get started quickly by signing your .apk files with a debug key,
	prior to installing them on an emulator or development device. This means that you can quickly
	run your application from Eclipse without having to generate your own private key. No specific
	action on your part is needed, provided ADT has access to Keytool. However, please note that if
	you intend to publish your application, you <strong>must</strong> sign the application with your
	own private key, rather than the debug key generated by the SDK tools.</p>

	<p>Please read <a href="{@docRoot}tools/publishing/app-signing.html">Signing Your
	Applications</a>, which provides a thorough guide to application signing on Android and what it
	means to you as an Android application developer. The document also includes a guide to exporting
	and signing your application with the ADT's Export Wizard.</p>

	<h2 id="AntReference">Ant Command Reference</h2>
	<dt><code>ant clean</code></dt>
	<dd>Cleans the project. If you include the <code>all</code> target before <code>clean</code>
	(<code>ant all clean</code>), other projects are also cleaned. For instance if you clean a
	test project, the tested project is also cleaned.</dd>

	<dt><code>ant debug</code></dt>
	<dd>Builds a debug package. Works on application, library, and test projects and compiles
	dependencies as needed.</dd>

	<dt id="emma"><code>ant emma debug</code></dt>
	<dd>Builds a test project while building the tested project with instrumentation turned on.
	This is used to run tests with code coverage enabled.</dd>

	<dt><code>ant release</code></dt>
	<dd>Builds a release package.</dd>

	<dt><code>ant instrument</code>
	</dt>
	<dd>Builds an instrumented debug package. This is generally called automatically when building a
	test project with code coverage enabled (with the <code>emma</code>
	target)</dd>

	<dt><code>ant <build_target> install</code></dt>
	<dd>Builds and installs a package. Using <code>install</code> by itself fails.</dd>

	<dt><code>ant installd</code></dt>
	<dd>Installs an already compiled debug package. This fails if the <code>.apk</code> is not
	already built.</dd>

	<dt><code>ant installr</code></dt>
	<dd>Installs an already compiled release package. This fails if the <code>.apk</code> is not
	already built.</dd>

	<dt><code>ant installt</code></dt>
	<dd>Installs an already compiled test package. Also installs the <code>.apk</code> of the
	tested application. This fails if the <code>.apk</code> is not already built.</dd>

	<dt><code>ant installi</code></dt>
	<dd>Installs an already compiled instrumented package. This is generally not used manually as
	it's called when installing a test package. This fails if the <code>.apk</code> is not already
	built.</dd>

	<dt><code>ant test</code></dt>
	<dd>Runs the tests (for test projects). The tested and test <code>.apk</code> files must be
	previously installed.</dd>

	<dt><code>ant debug installt test</code></dt>
	<dd>Builds a test project and the tested project, installs both <code>.apk</code> files, and
	runs the tests.</dd>

	<dt><code>ant emma debug install test</code></dt>
	<dd>Builds a test project and the tested project, installs both <code>.apk</code> files, and
	runs the tests with code coverage enabled.</dd>