blob: 62a1f59ae5277b8ff8d50dba8fdad45a57db5e2f [file] [log] [blame]
page.title=Android Core Technologies
Copyright 2015 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
<div id="qv-wrapper">
<div id="qv">
<h2>In this document</h2>
<ol id="auto-toc">
<p>Welcome to the Android core technologies section of the site. Here you
can find information on common features useful to people and organizations who
are looking to modify, contribute to, or port the Android software. This is
"under the hood" information intended for engineers.</p>
<h2 id="accessory-protocol-information">Accessories</h2>
<p>Android devices can connect to hardware accessories, such as audio docks,
keyboards and custom hardware, through USB or Bluetooth. This section
describes the Android Open Accessory protocol (AOAP) for accessory hardware
<p><a href="{@docRoot}accessories/index.html">&raquo; Accessory Protocol
<h2 id="art-technical-information">ART</h2>
<p>The Android runtime (ART) is the heart of Android. It's a fast, ahead-of-time
compiled runtime with modern garbage collection designed to scale.
Android applications are compiled to Dalvik bytecode and run with ART. This
section includes detailed information such as the Dalvik Executable format
specification, and design information on the runtime itself.</p>
<p><a href="{@docRoot}devices/tech/dalvik/index.html">&raquo; ART and Dalvik
<h2 id="data-usage-technical-information">Data Usage</h2>
<p>Android's data usage features allow users to understand and control how
their device uses network data. This section is designed for systems
integrators and mobile operators to help explain technical details they
should be aware of when porting Android to specific devices.</p>
<p><a href="{@docRoot}devices/tech/datausage/index.html">&raquo; Data Usage
<h2 id="debugging">Debugging and Tuning</h2>
<p>Android is a large and complex system. This section includes tips and tricks
for debugging at the platform level.</p>
<p><a href="{@docRoot}devices/tech/debug/index.html">&raquo; Debugging
<h2 id="HAL-technical-information">HAL File Reference</h2>
<p>Android's Hardware Abstraction Layer (HAL) provides the interface between
software APIs and hardware drivers. This section contains the commented code
files of the HAL.</p>
<p><a href="{@docRoot}devices/halref/files.html">&raquo; HAL Reference</a></p>
<h2 id="kernel-technical-information">Kernel</h2>
<p>The kernel configuration settings in this section are meant to be used as
a base for an Android kernel configuration. All devices should have the
options in android-base configuration enabled.</p>
<p><a href="{@docRoot}devices/tech/kernel.html">&raquo; Kernel Information</a>
<h2 id="lowram-technical-information">Low RAM</h2>
<p>Android supports devices with limited memory through various optimizations
such as improved memory management, reduced system memory, and several
build-time and kernel configuration settings.</p>
<p><a href="{@docRoot}devices/tech/low-ram.html">&raquo; Low RAM Information</a>
<h2 id="ota-technical-information">OTA Updates</h2>
<p>Android devices in the field can receive and install over-the-air (OTA)
updates to the system and application software. This section describes the
structure of update packages and the tools to build them. It is intended for
developers building OTA updates for new and released Android devices.</p>
<p><a href="{@docRoot}devices/tech/ota/index.html">&raquo; OTA Information</a>
<h2 id="power-technical-information">Power</h2>
<p>Battery usage statistics are tracked by the framework. This involves
keeping track of time spent by different device components in different states.
<p><a href="{@docRoot}devices/tech/power.html">&raquo; Power Information</a>
<h2 id="security-technical-information">Security</h2>
<p>Android security comes with a variety of measures, including an application
sandbox, SELinux, dm-verity, encryption, and more.</p>
<p><a href="{@docRoot}devices/tech/security/index.html">&raquo; Security
<h2 id="tradefed-test-infrastructure">Trade Federation Testing Infrastructure
<p>Trade Federation is a continuous test framework for running tests on
Android devices. Trade Federation's modularity makes it straightforward to
slot into environments with existing build, test, and reporting
<p><a href="{@docRoot}devices/tech/test_infra/tradefed/index.html">
&raquo; Trade Federation Testing Infrastructure Overview</a></p>