From d83a98f4ce9cfa908f5c54bbd70f03eec07e7553 Mon Sep 17 00:00:00 2001
From: The Android Open Source Project <initial-contribution@android.com>
Date: Tue, 3 Mar 2009 18:28:45 -0800
Subject: auto import from //depot/cupcake/@135843

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-page.title=What is Android?
-@jd:body
-
-<p>Android is a software stack for mobile devices that includes an operating
-system, middleware and key applications. The <a
-href="http://code.google.com/android/download.html">Android SDK</a>
-provides the tools and APIs necessary to begin developing applications on the
-Android platform using the Java programming language.</p>
-
-<h2>Features</h2>
-
-<ul>
-    <li><strong>Application framework</strong> enabling reuse and replacement
-    of components</li>
-    <li><strong>Dalvik virtual machine</strong> optimized for mobile
-        devices</li>
-    <li><strong>Integrated browser</strong> based on the open source <a
-    href="http://webkit.org/">WebKit</a> engine </li>
-    <li><strong>Optimized graphics</strong> powered by a custom 2D graphics library; 3D
-    graphics based on the OpenGL ES 1.0 specification (hardware acceleration
-    optional)</li>
-    <li><strong>SQLite</strong> for structured data storage</li>
-    <li><strong>Media support</strong> for common audio, video, and still
-    image formats (MPEG4, H.264, MP3, AAC, AMR, JPG, PNG,
-    GIF)</li>
-    <li><strong>GSM Telephony</strong> (hardware dependent)</li>
-    <li><strong>Bluetooth, EDGE, 3G, and WiFi</strong> (hardware dependent)</li>
-    <li><strong>Camera, GPS, compass, and accelerometer</strong> (hardware dependent)</li>
-    <li><strong>Rich development environment</strong> including a device
-    emulator, tools for debugging, memory and performance profiling, and a plugin for the Eclipse IDE</li>
-</ul>
-
-<a name="os_architecture" id="os_architecture"></a>
-<h2>Android Architecture</h2> 
-
-<p>The following diagram shows the major components of the Android operating
-system. Each section is described in more detail below.</p>
-
-<p><img src="{@docRoot}images/system-architecture.jpg" alt="Android System Architecture" width="713" height="512"></p>
-
-<a name="applications" id="applications"></a>
-<h2>Applications</h2>
-
-<p>Android will ship with a set of core applications including an email
-client, SMS program, calendar, maps, browser, contacts, and
-others. All applications are written using the Java programming language.</p>
-
-<a name="application_framework" id="application_framework"></a>
-<h2>Application Framework</h2>
-
-<p>Developers have full access to the same framework APIs used by the core
-applications. The application architecture is designed to simplify the reuse
-of components; any application can publish its capabilities and any other
-application may then make use of those capabilities (subject to security
-constraints enforced by the framework). This same mechanism allows components
-to be replaced by the user.</p>
-
-<p>Underlying all applications is a set of services and systems, including:
-<ul>
-    <li>A rich and extensible set of <a
-    href="{@docRoot}guide/tutorials/views/index.html">Views</a> that can be used to
-    build an application, including lists, grids, text boxes, buttons, and even
-    an embeddable web browser</li>
-    <li><a href="{@docRoot}guide/topics/providers/content-providers.html">Content
-    Providers</a> that enable applications to access data from other
-    applications (such as Contacts), or to share their own data</li> <li>A <a
-    href="{@docRoot}guide/topics/resources/resources-i18n.html">Resource
-    Manager</a>, providing access to non-code resources such as localized
-    strings, graphics, and layout files</li>
-    <li>A {@link android.app.NotificationManager Notification Manager} that enables
-    all applications to display custom alerts in the status bar</li>
-    <li>An {@link android.app.Activity Activity Manager} that manages the
-    lifecycle of applications and provides a common navigation backstack</li>
-</ul>
-
-<p>For more details and a walkthrough of an application, see the <a
-href="{@docRoot}guide/tutorials/notepad/index.html">Notepad Tutorial</a>.</p>
-    
-<a name="libraries" id="libraries"></a>
-<h2>Libraries</h2>
-
-<p>Android includes a set of C/C++ libraries used by various components of the
-Android system. These capabilities are exposed to developers through the
-Android application framework. Some of the core libraries are listed below:</p>
-<ul>
-    <li><strong>System C library</strong> - a BSD-derived implementation of
-    the standard C system library (libc), tuned for embedded Linux-based
-    devices</li>
-    <li><strong>Media Libraries</strong> - based on PacketVideo's OpenCORE;
-    the libraries support playback and recording of many popular audio and video
-    formats, as well as static image files, including MPEG4, H.264, MP3, AAC,
-    AMR, JPG, and PNG</li>
-    <li><strong>Surface Manager</strong> - manages access to the display
-    subsystem and seamlessly composites 2D and 3D graphic layers from multiple
-    applications</li>
-    <li><strong>LibWebCore</strong> - a modern web browser engine which
-    powers both the Android browser and an embeddable web view</li>
-    <li><strong>SGL</strong> - the underlying 2D graphics
-    engine</li>
-    <li><strong>3D libraries</strong> - an implementation based on
-    OpenGL ES 1.0 APIs; the libraries use either hardware 3D acceleration
-    (where available) or the included, highly optimized 3D software
-    rasterizer</li>
-    <li><strong>FreeType</strong> - bitmap and vector font rendering</li>
-    <li><strong>SQLite</strong> - a powerful and lightweight relational
-    database engine available to all applications</li>
-</ul>
-
-<a name="runtime" id="runtime"></a>
-
-<h2>Android Runtime</h2>
-
-<p>Android includes a set of core libraries that provides most of
-the functionality available in the core libraries of the Java programming
-language.</p>
-
-<p>Every Android application runs in its own process, with its own instance of
-the Dalvik virtual machine. Dalvik has been written so that a device can run
-multiple VMs efficiently. The Dalvik VM executes files in the Dalvik
-Executable (.dex) format which is optimized for minimal memory
-footprint. The VM is register-based, and runs classes
-compiled by a Java language compiler that have been transformed into the .dex
-format by the included &quot;dx&quot; tool.</p>
-
-<p>The Dalvik VM relies on the Linux kernel for underlying functionality such
-as threading and low-level memory management.</p>
-
-<a name="kernel" id="kernel"></a>
-
-<h2>Linux Kernel</h2>
-
-<p>Android relies on Linux version 2.6 for core system services such as
-security, memory management, process management, network stack, and driver
-model. The kernel also acts as an abstraction layer between the hardware and
-the rest of the software stack.</p>
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