47 lines
2.2 KiB
HTML
47 lines
2.2 KiB
HTML
<html devsite>
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<head>
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<title>Android Interfaces and Architecture</title>
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<meta name="project_path" value="/_project.yaml" />
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<meta name="book_path" value="/_book.yaml" />
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</head>
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<body>
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<!--
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Copyright 2017 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<p>Android gives you the freedom to implement your own device specifications and
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drivers. The hardware abstraction layer (HAL) provides a standard method for
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creating software hooks between the Android platform stack and your hardware.
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The Android operating system is also open source, so you can contribute your own
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interfaces and enhancements.</p>
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<p>Before porting Android to your hardware, take a moment to understand the
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<a href="/devices/architecture/index.html">Android system architecture</a>.
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Because your drivers and the HAL interact with Android, knowing its structure
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can help you navigate the many layers of code in the Android Open Source Project
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(AOSP) source tree. When you are comfortable with the basic Android
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architecture, review the interface-specific documentation in this section to
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learn about specific HALs and how to build them for your device.</p>
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<p>To maintain a high level of quality and offer a consistent user experience,
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Android requires that all implementations meet the requirements stated in the
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<a href="/compatibility/cdd.html">Compatibility Definition Document (CDD)</a>
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and that all devices pass tests in the
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<a href="/compatibility/cts.html">Compatibility Test Suite (CTS)</a>. For
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details on the Android compatibility program, see
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<a href="/compatibility/index.html">Compatibility</a>.</p>
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</body>
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</html>
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