1 page.title=Android Core Technologies 2 @jd:body 3 4 <!-- 5 Copyright 2015 The Android Open Source Project 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 --> 19 <div id="qv-wrapper"> 20 <div id="qv"> 21 <h2>In this document</h2> 22 <ol id="auto-toc"> 23 </ol> 24 </div> 25 </div> 26 27 28 <p>Welcome to the Android core technologies section of the site. Here you 29 can find information on common features useful to people and organizations who 30 are looking to modify, contribute to, or port the Android software. This is 31 "under the hood" information intended for engineers.</p> 32 33 <h2 id="art-technical-information">ART and Dalvik</h2> 34 <p>The Android runtime (ART) is the heart of Android. It's a fast, ahead-of-time 35 compiled runtime with modern garbage collection designed to scale. 36 Android applications are compiled to Dalvik bytecode and run with ART. This 37 section includes detailed information such as the Dalvik Executable format 38 specification, and design information on the runtime itself.</p> 39 <p><a href="{@docRoot}devices/tech/dalvik/index.html">» ART and Dalvik 40 Information</a></p> 41 42 <h2 id="config">Configuration</h2> 43 <p>Getting the most out of Android requires tuning of the <a 44 href="{@docRoot}devices/tech/config/kernel.html">kernel</a>, <a 45 href="{@docRoot}devices/tech/config/renderer.html">OpenGLRenderer</a>, and 46 more. See the subpages of this section for details. 47 <p><a href="{@docRoot}devices/tech/config/index.html">» Configuration 48 Information</a></p> 49 50 <h2 id="connect">Connectivity</h2> 51 <p>This section covers Android support for NFC standards (such as Felica), 52 provides details on the Radio Interface Layer (RIL), describes call notification 53 behavior, and gives implementation instructions for user-facing features such as 54 Data Saver and phone number blocking.</p> 55 <p><a href="{@docRoot}devices/tech/connect/index.html">» Connectivity 56 Information</a></p> 57 58 <h2 id="data-usage-technical-information">Data Usage</h2> 59 <p>Android's data usage features allow users to understand and control how 60 their device uses network data. This section is designed for systems 61 integrators and mobile operators to help explain technical details they 62 should be aware of when porting Android to specific devices.</p> 63 <p><a href="{@docRoot}devices/tech/datausage/index.html">» Data Usage 64 Information</a></p> 65 66 <h2 id="debugging">Debugging</h2> 67 <p>Android is a large and complex system. This section includes tips and tricks 68 for debugging at the platform level.</p> 69 <p><a href="{@docRoot}devices/tech/debug/index.html">» Debugging 70 Information</a></p> 71 72 <h2 id="admin-information">Device Administration</h2> 73 <p>Since Android 5.0, the platform supports use cases in a corporate 74 environment under the auspices of each companys information technology (IT) 75 department.</p> 76 <p><a href="{@docRoot}devices/tech/admin/index.html">» Device 77 administration information</a></p> 78 79 <h2 id="display">Display Settings</h2> 80 <p>This section covers AOSP implementation of various Android display 81 settings, including app shortcuts, circular launcher icons, do not disturb 82 (DND), multi-window (split-screen, free-form, and picture-in-picture), high 83 dynamic range (HDR) video, night light, and retail demo mode.</p> 84 <p><a href="{@docRoot}devices/tech/display/index.html">» Display settings 85 information</a></p> 86 87 <h2 id="HAL-technical-information">HAL File Reference</h2> 88 <p>Android's Hardware Abstraction Layer (HAL) provides the interface between 89 software APIs and hardware drivers. This section contains the commented code 90 files of the HAL.</p> 91 <p><a href="{@docRoot}devices/halref/files.html">» HAL Reference</a></p> 92 93 <h2 id="ota-technical-information">OTA Updates</h2> 94 <p>Android devices in the field can receive and install over-the-air (OTA) 95 updates to the system and application software. This section describes the 96 structure of update packages and the tools to build them. It is intended for 97 developers building OTA updates for new and released Android devices.</p> 98 <p><a href="{@docRoot}devices/tech/ota/index.html">» OTA Information</a> 99 </p> 100 101 <h2 id="power-technical-information">Power</h2> 102 <p>The framework provides battery usage statistics, keeping track of time spent 103 by different device components in different states. This section covers power 104 management features (such as Doze), gives instructions for accurately measuring 105 device and component power (and how to determine power values), and details the 106 <code>batterystats</code> command and output.</p> 107 <p><a href="{@docRoot}devices/tech/power/index.html">» Power 108 Information</a></p> 109 110 <h2 id="tradefed-test-infrastructure">Trade Federation Testing Infrastructure 111 </h2> 112 <p>Trade Federation is a continuous test framework for running tests on 113 Android devices. Trade Federation's modularity makes it straightforward to 114 slot into environments with existing build, test, and reporting 115 infrastructures.</p> 116 <p><a href="{@docRoot}devices/tech/test_infra/tradefed/index.html"> 117 » Trade Federation Testing Infrastructure Overview</a></p> 118
