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23<div class="wrap">
24
25<div class="landing-banner">
26<h1 itemprop="name" style="margin-bottom:0;">Welcome to the Android Open Source Project!</h1>
27
28<p>Android is an open source software stack for a wide range of mobile devices
29and a corresponding open source project led by Google. This site and the Android
30Open Source Project (AOSP) repository offer the information and source code you
31need to create custom variants of the Android stack, port devices and
32accessories to the Android platform, and ensure your devices meet compatibility
33requirements.</p>
34
35<h2 align="center">Android 7.1 Updates Available</h2>
36
37</div>
38
39</div>
40
41<div class="wrap">
42
43<div class="landing-docs">
44  <div class="col-8">
45  <h3>What's New</h3>
46
47<h4>March Android Security Bulletin</h4>
48<p>The <strong><a href="{@docRoot}security/bulletin/2017-03-01.html">March
492017 Android Security Bulletin</a></strong> has been published along with links
50to associated fixes. In addition, new
51<strong><a href="{@docRoot}source/build-numbers.html#source-code-tags-and-builds">build
52numbers</a></strong> have been published for Nexus 6 running Android 7.0 and
537.1.1 and also Pixel, Pixel XL, Pixel C, Nexus 5X, Nexus 6P, Nexus 9, and Nexus
54Player running Android 7.1.1 to support the March Android security release.</p>
55
56<h4>Systems Testing With VTS</h4>
57<p>The Vendor Test Suite (VTS) automates HAL and OS kernel testing.
58<strong><a href="{@docRoot}devices/tech/test_infra/tradefed/fundamentals/vts.html">New
59documentation</a></strong> covers how to use VTS to test an Android native
60system implementation, set up a testing environment then test a patch using
61a VTS plan.</p>
62
63<h4>New Dalvik Bytecodes and Formats</h4>
64<p>Dalvik now offers new <strong><a
65href="{@docRoot}devices/tech/dalvik/dalvik-bytecode.html">bytecode formats 45cc
66and 4rcc</a></strong> and placeholder opcodes for <strong><a
67href="{@docRoot}devices/tech/dalvik/instruction-formats.html">invoke-polymorphic
68and invoke-polymorphic/range</a></strong>, which are the first dex instructions
69that use these new formats. In addition to a method_idx that gives the invoked
70method, these instructions also provide a proto_idx that gives the (static)
71type signature of the call site.</p>
72
73<h4>Background App Compilation in A/B System Updates</h4>
74<p>Examples for
75<strong><a href="{@docRoot}devices/tech/dalvik/configure.html#other_odex">installing</a></strong> and
76<strong><a href="{@docRoot}devices/tech/ota/ab_updates.html#configuration">configuring</a></strong>
77<code>otapreopt_script</code> have been added to explain how to use this tool
78for optimizing user apps so they are ready to run after the device reboots
79during an A/B system update.</p>
80
81<h4>Android 7.1 CDD</h4>
82<p>The <strong><a href="{@docRoot}compatibility/7.1/android-7.1-cdd.html">7.1
83version</a></strong> of the <strong><a
84href="{@docRoot}compatibility/cdd.html">Android Compatibility Definition
85Document</a></strong> (CDD) has been published. See its <strong><a
86href="https://android.googlesource.com/platform/compatibility/cdd/+log/nougat-mr1-dev/?pretty=full&no-merges">change
87log</a></strong> for a summary of updates.</p>
88
89<h4>Diagnosing Native Crashes</h4>
90<p><strong><a
91href="{@docRoot}devices/tech/debug/native-crash.html">Native crashes</a></strong>
92are now described in detail, fully explaining the <strong><a
93href="{@docRoot}devices/tech/debug/native-crash.html#crashtypes">types of
94crashes</a></strong> expected and including the clues for finding them in
95<code>debuggerd</code> output.</p>
96
97</div>
98
99<div class="col-8">
100
101<h3>Getting Started</h3>
102<a href="{@docRoot}source/index.html"><h4>Explore the Source</h4></a>
103<p>Get the complete Android platform and modify and build it to suit your needs.
104You can also
105<strong><a href="https://android-review.googlesource.com/#/q/status:open">contribute
106to</a></strong> the <strong><a href="https://android.googlesource.com/">AOSP
107repository</a></strong> to make your changes available to everyone else in the
108Android ecosystem.</p>
109
110<a href="{@docRoot}source/index.html"><img border="0"
111src="images/android_framework_small.png" alt="Android framework summary"
112style="display:inline;float:right;margin:5px 10px;width:42%;height:42%"></a>
113
114<a href="{@docRoot}devices/index.html"><h4>Port Android to Devices</h4></a>
115<p>Get help porting the latest Android platform to create compelling devices for
116your customers. Includes documentation for HAL interfaces and details on core
117technologies such as Android runtime (ART) and over-the-air (OTA) updates.</p>
118
119<a href="{@docRoot}security/index.html"><h4>Make Secure</h4></a>
120<p>Follow these examples and instructions to harden your Android devices against
121malicious attacks. Find out how the Android security program works and learn how
122to implement the latest features.</p>
123
124<a href="{@docRoot}compatibility/index.html"><h4>Get Compatible</h4></a>
125<p>Being Android-compatible lets you offer custom features but still give users
126and developers a consistent and standard experience across all Android-powered
127devices. Android provides guidance and a test suite to verify your Android
128compatibility.</p>
129
130<a href="https://android.googlesource.com/platform/docs/source.android.com/">
131<h4>Help this Site</h4></a>
132<p>Use the <strong>Site Feedback</strong> button at the bottom of any page to
133request content improvements or let us know about errors. To contribute your
134own updates to the site or to view a complete list of site changes, use the AOSP
135project
136<strong><a href="https://android.googlesource.com/platform/docs/source.android.com/+log/master?no-merges">docs/source.android.com.</a></strong></p>
137</div>
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139</div>
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