336 lines
14 KiB
HTML
Executable File
336 lines
14 KiB
HTML
Executable File
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
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<title>Android - Porting Guide</title>
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<script src="http://www.google.com/uds/api?file=uds.js&v=1.0&key=internal-codesite" type="text/javascript"></script>
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height= document.getElementById('doxygen').contentDocument.body.scrollHeight + 20;
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document.getElementById('doxygen').style.height = height;
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<script src="http://code.google.com/android/assets/search_autocomplete.js"></script>
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<link rel="stylesheet" type="text/css" href="http://code.google.com/css/semantic_headers.css" />
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<link rel="stylesheet" type="text/css" href="http://code.google.com/android/assets/style.css" />
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<script>
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jQuery(document).ready(function() {
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jQuery("pre").addClass("prettyprint");
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<style type="text/css">
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h1,h2,h3 {
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color: #000000;
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</style>
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</head>
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<body class="gc-documentation">
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<div id="gc-container">
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<a name="top"></a>
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<div id="skipto"> </div>
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<div id="langpref">
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<!--<a class="dropdown" href="/">English</a> <span>|</span> <a href="/more/">Site Directory</a> -->
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</div>
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<div id="gc-header">
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<div id="logo"><a href="http://code.google.com/android/index.html"><img src="http://code.google.com/android/images/logo_android.gif" alt="Android"/></a></div>
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<div id="search" style="inline">
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display : none !important;
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<form id="searchbox_001456098540849067467:6whlsytkdqg" action="http://www.google.com/cse">
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<input type="hidden" name="cx" value="001456098540849067467:6whlsytkdqg" />
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<input type="hidden" name="cof" value="FORID:0" />
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<input type="text" name="q" maxlength="2048" size="41" autocomplete="off" title="Google Code Search"/>
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<input type="submit" name="sa" value="Search" title="Search"/>
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<br/>
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<div class="greytext">e.g. "ajax apis" or "open source"</div>
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<div id="codesiteContent">
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<a name="gc-topnav-anchor"></a>
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<div id="gc-topnav">
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<h1>Android Platform Development Kit</h1>
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<ul class="gc-topnav-tabs">
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<li id="sdk_link"> <a href="http://code.google.com/android/index.html" title="Android Software Development Kit">SDK</a> </li>
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<li id="docs_link"> <a href="index.html" title="Official Android documentation">Docs</a> </li>
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<li id="faq_link"> <a href="http://code.google.com/android/kb/index.html" title="Answers to frequently asked questions about Android">FAQ</a> </li>
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<li> <a href="http://android-developers.blogspot.com/" title="Official Android blog">Blog</a> </li>
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<li> <a href="http://code.google.com/android/groups.html" title="Android developer forum">Group</a> </li>
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<li> <a href="http://code.google.com/android/terms.html" title="Android terms of service">Terms</a> </li>
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<li> <a href="mailto:android-pdk-feedback@google.com?subject=PDK%20Feedback&body=(filed%20from:%20index.html%20v0.5%20-%2025%20September%202008)%0D%0A%0D%0ASUMMARY:%0D%0A%0D%0A%0D%0A%0D%0ASTEPS%20TO%20REPRODUCE:%0D%0A%0D%0A%0D%0A%0D%0AADDITIONAL%20NOTES:">Report a Problem</a> </li>
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<div class="g-section g-tpl-180">
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<a name="gc-toc"></a>
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<div class="g-unit g-first" id="gc-toc">
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<ul>
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<li>
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<h1><a href="index.html">Documentation</a></h1>
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<ul>
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<li> <strong>Introduction</strong>
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<ul>
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<li><a href="system_requirements.html">Device Requirements</a></li>
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</ul>
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</li>
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<li> <strong>Dev Environment Setup</strong>
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<ul>
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<li><a href="source_setup_guide.html">Host System Setup</a></li>
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<li><a href="getting_source_code.html">Getting Source Code</a></li>
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<li> <a href="intro_source_code.html">Source Code Overview</a></li>
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<li><a href="build_system.html">Build System</a></li>
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</ul>
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</li>
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<li> <strong>Basic Bring up</strong>
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<ul>
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<li><a href="build_new_device.html">Building New Device</a></li>
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<li><a href="bring_up.html">Bring up</a></li>
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<li><a href="keymaps_keyboard_input.html">Keymaps and Keyboard</a></li>
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<li><a href="display_drivers.html">Display Drivers</a></li>
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</ul>
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</li>
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<li> <strong>Multimedia</strong>
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<ul>
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<li><a href="audio_sub_system.html">Audio Subsystem</a></li>
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<li><a href="camera.html">Camera</a></li>
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</ul>
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</li>
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<li> <strong>Power Management</strong>
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<ul>
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<li><a href="power_management.html">Power Management</a></li>
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</ul>
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</li>
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<li> <strong>Networking</strong>
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<ul>
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<li><a href="wifi.html">Wi-Fi</a></li>
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<li><a href="gps.html">GPS</a></li>
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<li><a href="bluetooth.html">Bluetooth</a></li>
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</ul>
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</li>
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<li> <strong>Telephony</strong>
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<ul>
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<li><a href="telephony.html">Radio Interface Layer</a></li>
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</ul>
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</li>
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<li> <strong>Testing</strong>
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<ul>
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<li><a href="instrumentation_testing.html">Instrumentation Testing</a></li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<a name="gc-pagecontent"></a>
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<div class="g-unit" id="gc-pagecontent">
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<div id="jd-content">
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<div class="jd-descr">
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<a name="androidGettingSourceCodeTitle"></a><h1>Getting Source Code</h1>
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<a name="toc"/>
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<div style="padding:10px">
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<a href="#androidSourceSetupBuildGitSetup">Introduction</a><br/>
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<a href="#androidSourceSetupBuildGitSetupInstall">Installing and Configuring Git</a><br/>
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<a href="#androidSourceSetupBuildGitSetupServer">Establishing Server Access</a><br/><div style="padding-left:40px">
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<a href="#androidSourceSetupBuildGitSetupServerRSAKeys">Generating RSA Keys</a><br/>
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<a href="#androidSourceSetupBuildGitSetupServerVerifyConnection">Verifying a Connection to the Git Server</a><br/></div>
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<a href="#androidSourceSetupGetCode">Downloading Code</a><br/>
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<a href="#androidSourceSetupExtractingPatch">Extracting an Android Patch</a><br/></div></font></div>
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<a name="androidSourceSetupBuildGitSetup"></a><h2>Introduction</h2>
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<p>Android relies on Git, a version control system, to install the Android platform. You will need to install Git 1.5.2 or greater in order to access the source tree. Please visit <a href="http://git.or.cz/">http://git.or.cz/</a> for more information regarding Git.</p>
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<p>Git permits you to control access to working directories, and we recommend that you use it to limit Android repository access to only a few people within your organization (please refer to your Google NDA for potential contractual restraints on sharing Android source access). </p>
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<p>You may clone Google's repository to a local copy for sharing internally (see Git documentation for details).</p>
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<a name="androidSourceSetupBuildGitSetupInstall"></a><h2>Installing and Configuring Git</h2>
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<p>To install the Git package, execute:</p>
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<pre class="prettyprint">
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% sudo apt-get install git-core
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</pre>
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<a name="androidSourceSetupBuildGitSetupServer"></a><h2>Establishing Server Access</h2>
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<p>Once Git is cleanly installed, you need to establish a connection with Google's Git server, a connection that requires an RSA key in order to authenticate requests.</p>
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<a name="androidSourceSetupBuildGitSetupServerRSAKeys"></a><h3>Generating RSA Keys</h3>
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<p>Each developer must have a unique RSA key in order to access Android source code. To generate an RSA key: </p>
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<p>
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<ol>
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<li>Type:<br/>
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<pre class="prettyprint">% ssh-keygen -t rsa -C email@domain.com</pre><br/>
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You must use a valid email address to create your key.</li>
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<li>When prompted, indicate the file to which you wish to write your key (<code>id_rsa</code> in this example).</li>
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<li>When prompted, associate a passphrase with your key.</li>
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<li>Upon success, you should have two files saved to the designated directory: </li>
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<ul>
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<li><code>id_rsa</code>: This file contains the private half of your RSA key. You shouldn't share this file with anyone. </li>
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<li><code>id_rsa.pub</code>: This is the public half or your RSA key and you should send it to your Google technical account manager.</li>
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</ul>
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</ol>
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</p>
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<p>Send your Google Account Manager your public key file in order to establish Git server access. </p>
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<a name="androidSourceSetupBuildGitSetupServerVerifyConnection"></a><h3>Verifying a Connection to the Git Server</h3>
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<p>Once you have generated an RSA key and shared the public file with Google, you can test your connection with the Git server with the following command:</p>
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<pre class="prettyprint">
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% ssh android-git.ext.google.com
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</pre>
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<p>You should receive one of the following results:</p>
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<table border=1 cellpadding=2 cellspacing=0>
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<tbody><tr>
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<th scope="col">Result</th>
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<th scope="col">Cause</th>
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<th scope="col">Action</th>
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</tr>
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<tr>
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<td>
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<code>fatal: What do you think I am? A shell?<BR>
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Connection to android-git closed.</code>
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</pre> </td>
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<td>Success</td>
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<td>None. You successfully connected to the Git server. (You should not have shell access and it's expected to receive this error.)</td>
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</tr>
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<tr>
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<td>ssh hangs and eventually times out. </td>
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<td>Your setup is failing to locate and establish a basic connection. </td>
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<td>Google needs to debug network settings. </td>
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</tr>
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<tr>
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<td>Error: Permission denied <public key> </td>
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<td>Either you are not using the matching username or the RSA private key does not match the public key. </td>
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<td>Try executing:<BR>
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<code>
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% ssh $USER@android-
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git.ext.google.com
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</code></td>
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</tr>
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</table>
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<a name="androidSourceSetupGetCode"></a><h2>Downloading Code</h2>
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<p>Android source code is maintained in two repositories: <code>device</code> and <code>kernel</code>. The <code>device</code> repository includes the Android framework (things like the Activity Manager, Window Manager, Telephony Manager, View System, etc.). The <code>kernel</code> repository includes the core code necessary to run the operating system (things like the Display Driver, Camera Driver, Keypad Driver, Power Management, etc.). (Please see <a href="http://code.google.com/android/what-is-android.html">What is Android?</a> for details.)</p>
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<p>Save device and kernel code at the same directory level, for example:</p>
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<p>
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<ul><li><code>/home/joe/android/device</code></li>
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<li><code>/home/joe/android/kernel</code></li>
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</ul></p>
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<p><b>Device Code</b></p>
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<p>To download device code, you need your username and a unique <code><path></code> string supplied by Google to execute the following:</p>
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<pre class="prettyprint">
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% git-clone $USER@android-git.ext.google.com:<path>/device.git
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</pre>
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<p><b>Kernel Code</b></p>
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<p>To download kernel code, you need your username and a unique <code><path></code> string supplied by Google to execute the following:</p>
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<pre class="prettyprint">
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% git-clone $USER@android-git.ext.google.com:<path>/kernel.git
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</pre>
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<a name="androidSourceSetupExtractingPatch"></a><h2>Extracting an Android Patch</h2>
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<p>You likely already have Linux running on your platform and only need to integrate Android-specific changes. The following directions describe how to extract an Android patch.</p>
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<ol>
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<li>Download a generic version of the Linux kernel that matches the Linux version downloaded with the Android Kernel code.</li>
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<li>Run <code>diff</code> on the two kernel packages to get Android-specific changes.</li>
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<li>Apply the patch to your target kernel and build.</li>
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</ol>
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<p><span class="lh2"><a name="androidFooter"></a></span>
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<div class="text"> ©2008 Google<!-- - <a href="/">Code Home</a> - <a href="http://www.google.com/accounts/TOS">Site Terms of Service</a> - <a href="http://www.google.com/privacy.html">Privacy Policy</a> - <a href="/more">Site Directory</a> --></div>
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<div id="jd-build-id"> v0.5 - 25 September 2008</div>
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