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| <h2>In this document</h2> |
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| <p>Welcome to the Android technical documentation section of the site. Here you |
| can find technical information 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> |
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| <h2 id="accessory-protocol-information">Accessory Protocol Information</h2> |
| <p>Android devices can connect to hardware accessories, such as audio docks, |
| keyboards and custom hardware, through USB or Bluetooth. This document |
| describes the Android Open Accessory protocol for accessory hardware builders.</p> |
| <p><a href="{@docRoot}accessories/index.html">» Accessory Protocol Information</a></p> |
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| <h2 id="art-technical-information">ART Technical Information</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">» Dalvik Information</a></p> |
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| <h2 id="data-usage-technical-information">Data Usage Technical Information</h2> |
| <p>Android's data usage features allow users to understand and control how their |
| device uses network data. This document 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">» Data Usage Information</a></p> |
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| <h2 id="debugging">Debugging and Tuning</h2> |
| <p>Android is a large and complex system. This section includes tips and tricks |
| about debugging at the platform level.</p> |
| <p><a href="{@docRoot}devices/debugtune.html">» Debugging Information</a></p> |
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| <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">» HAL Reference</a></p> |
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| <h2 id="kernel-technical-information">Kernel Technical Information</h2> |
| <p>The kernel configuration settings in this document 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">» Kernel Information</a></p> |
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| <h2 id="power-technical-information">Power Technical Information</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> |
| <p><a href="{@docRoot}devices/tech/power.html">» Power Information</a></p> |
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| <h2 id="tradefed-test-infrastructure">Trade Federation Testing Infrastructure</h2> |
| <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 infrastructures.</p> |
| <p><a href="{@docRoot}devices/tech/test_infra/tradefed/index.html">» Trade Federation Testing Infrastructure Overview</a></p> |
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