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Embedded Android Embedded Android Karim Yaghmour Beijing • Cambridge • Farnham • Köln • Sebastopol • Tokyo Embedded Android by Karim Yaghmour Revision History for the : See http://oreilly.com/catalog/errata.csp?isbn=9781449308292 for release details. ISBN: 978-1-449-30829-2 1317666851 Table of Contents Preface ..................................................................... vii 1. Introduction ........................................................... 1 History 1 Features and Characteristics 2 Development Model 4 Differences With "Classic" Open Source Projects 5 Feature Inclusion, Roadmaps, and New Releases 6 Ecosystem 7 A Word on the Open Handset Alliance 7 Getting "Android" 8 Legal Framework 9 Code Licenses 9 Branding Use 12 Google's Own Android Apps 13 Alternative App Markets 13 Oracle v Google 13 Hardware and Compliance Requirements 14 Compliance Definition Document 15 Compliance Test Suite 18 Development Setup and Tools 19 2. Internals Primer ....................................................... 21 App Developer's View 21 Android Concepts 22 Framework Intro 25 App Development Tools 27 Native Development 27 Overall Architecture 28 Linux Kernel 29 Wakelocks 30 iii Low Memory Killer 31 Binder 32 Anonymous Shared Memory (ashmem) 33 Alarm 34 Logger 35 Other Notable Androidisms 37 Hardware Support 38 The Linux Approach 38 Android's General Approach 39 Loading and Interfacing Methods 40 Device Support Details 42 Native User-Space 43 Filesystem layout 44 Libraries 45 Init 47 Toolbox 48 Daemons 49 Command-Line Utilities 50 Dalvik and Android's Java 50 Java Native Interface (JNI) 52 System Services 53 Service Manager and Binder Interaction 55 Calling on Services 57 A Service Example: the Activity Manager 57 Stock AOSP Packages 57 System Startup 59 3. AOSP Jumpstart ....................................................... 63 Getting the AOSP 63 Inside the AOSP 65 Build Basics 68 Build System Setup 68 Building Android 69 Running Android 73 Using ADB 75 Mastering the Emulator 79 4. The Build System ...................................................... 85 Comparisons With Other Build Systems 85 Architecture 87 Configuration 88 envsetup.sh 91 Directive Definitions 95 iv | Table of Contents Main Make Recipes 96 Cleaning 98 Module Build Templates 98 Output 102 Build Recipes 104 The Default droid Build 104 Seeing the Build Commands 105 Building the SDK for Linux and MacOS 105 Building the SDK for Windows 106 Building the CTS 106 Building the NDK 108 Updating the API 109 Building a Single Module 110 Building Out of Tree 110 Basic AOSP Hacks 112 Adding an App 112 Adding a Native Tool or Daemon 113 Adding a Native Library 114 Adding a Device 115 Adding an App Overlay 120 Table of Contents | v Preface Android's growth is phenomenal. In a very short time-span, it has succeeded in be- coming one of the top mobile platforms in the market. Clearly, the unique combination of open source licensing, aggressive go-to-market, and trendy interface is bearing fruit for Google's Android team. Needless to say, the massive user uptake generated by An- droid has not gone unnoticed for handset manufacturers, mobile network operators, silicon manufacturers, and app developers. Products, apps and devices "for," "com- patible with," or "based on" Android seem to be coming out ever so fast. Beyond its mobile success, however, Android is also attracting the attention of yet another, unintended crowd: embedded systems developers. While a large number of embedded devices have little to no human interface, a substantial number of devices which would traditionally be considered "embedded" do have user interfaces. For a goodly number of modern machines, in addition to pure technical functionality, de- velopers creating user-facing devices must also contend with human-computer inter- action (HCI) factors. Therefore, designers must either present users with an experience they are already familiar with or risk alienating users by requiring them to learn a lesser known or entirely new user experience. Before Android, the user interface choices available to the developers of such devices were fairly limited and limiting. Clearly, embedded developers prefer offering users an interface they are already familiar with. Although that interface might have been window-based in the past—and hence a lot of embedded devices were based on classic window-centric, desktop-like or desk- top-based interfaces—Apple's iOS and Google's Android have forever democratized the use of touch-based iPhone-like graphical interfaces. This shift in user paradgims and expectations, combined with Android's open source licensing, have created a ground-swell of interest for Android within the embedded world. Unlike Android app developers, however, developers wanting to do any sort of platform work in Android, including porting or adapting Android to an embedded device, rap- idly run into quite a significant problem: the almost total lack of documentation on how to do that. So, while Google provides app developers with a considerable amount of online documentation and while there are a number of books on the topic, such as O'Reilly's Learning Android, embedded developers have to contend with the minimal- istic set of documents provided by Google at http://source.android.com. Embedded de- vii velopers seriously entertaining the use of Android in their system were essentially re- duced to starting with Android's source code. The purpose of this book is to remedy to that situation and enable you to embed An- droid in any device. You will therefore learn about Android's architecture, how to nav- igate its source code, how to modify its various components, and how to create your own version for your particular device. In addition, you will learn how Android inte- grates into the Linux kernel and how to leverage Android's Linux heritage. For instance, we will discuss how to take "classic" Linux components such as glibc and BusyBox and package them as part of Android. Along the way, you will learn day-to-day tips and tricks, such as how to use Android's repo tool and integrate with or modify Android's build system. Conventions Used in This Book The following typographical conventions are used in this book: Italic Indicates new terms, URLs, email addresses, filenames, and file extensions. Constant width Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords. Constant width bold Shows commands or other text that should be typed literally by the user. Constant width italic Shows text that should be replaced with user-supplied values or by values deter- mined by context. This icon signifies a tip, suggestion, or general note. This icon indicates a warning or caution. viii | Preface Using Code Examples This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless you’re reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from O’Reilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your product’s documentation does require permission. We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: “Embedded Android by Karim Yaghmour (O’Reilly). Copyright 2011 Karim Yaghmour, 9781449308292.” If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at [email protected]. Safari® Books Online Safari Books Online is an on-demand digital library that lets you easily search over 7,500 technology and creative reference books and videos to find the answers you need quickly. With a subscription, you can read any page and watch any video from our library online. Read books on your cell phone and mobile devices. Access new titles before they are available for print, and get exclusive access to manuscripts in development and post feedback for the authors. Copy and paste code samples, organize your favorites, down- load chapters, bookmark key sections, create notes, print out pages, and benefit from tons of other time-saving features. O’Reilly Media has uploaded this book to the Safari Books Online service. To have full digital access to this book and others on similar topics from O’Reilly and other pub- lishers, sign up for free at http://my.safaribooksonline.com. How to Contact Us Please address comments and questions concerning this book to the publisher: O’Reilly Media, Inc. 1005 Gravenstein Highway North Sebastopol, CA 95472 800-998-9938 (in the United States or Canada) 707-829-0515 (international or local) 707-829-0104 (fax) Preface | ix We have a web page for this book, where we list errata, examples, and any additional information. You can access this page at: http://www.oreilly.com/catalog/9781449308292 To comment or ask technical questions about this book, send email to: [email protected] For more information about our books, courses, conferences, and news, see our website at http://www.oreilly.com. Find us on Facebook: http://facebook.com/oreilly Follow us on Twitter: http://twitter.com/oreillymedia Watch us on YouTube: http://www.youtube.com/oreillymedia x | Preface CHAPTER 1 Introduction Putting Android on an embedded device is a complex task involving an intricate un- derstanding of its internals and a clever mix of modifications to the Android Open Source Project (AOSP) and the kernel on which it runs, Linux. Before we get into the details of embedding Android, however, let's start by covering some essential back- ground that embedded developers should factor in when dealing with Android, such as Android's hardware requirements and the legal framework surrounding Android and its implications within an embedded setting.
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