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| <title>Android Interfaces and Architecture</title> |
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| <p>Android gives you the freedom to implement your own device specifications and |
| drivers. The hardware abstraction layer (HAL) provides a standard method for |
| creating software hooks between the Android platform stack and your hardware. |
| The Android operating system is also open source, so you can contribute your own |
| interfaces and enhancements.</p> |
| |
| <p>Before porting Android to your hardware, take a moment to understand the |
| <a href="/devices/architecture/index.html">Android system architecture</a>. |
| Because your drivers and the HAL interact with Android, knowing its structure |
| can help you navigate the many layers of code in the Android Open Source Project |
| (AOSP) source tree. When you are comfortable with the basic Android |
| architecture, review the interface-specific documentation in this section to |
| learn about specific HALs and how to build them for your device.</p> |
| |
| <p>To maintain a high level of quality and offer a consistent user experience, |
| Android requires that all implementations meet the requirements stated in the |
| <a href="/compatibility/cdd.html">Compatibility Definition Document (CDD)</a> |
| and that all devices pass tests in the |
| <a href="/compatibility/cts.html">Compatibility Test Suite (CTS)</a>. For |
| details on the Android compatibility program, see |
| <a href="/compatibility/index.html">Compatibility</a>.</p> |
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