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Pro Android
Sayed Y. Hashimi and Satya Komatineni
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Pro Android
Copyright © 2009 by Sayed Y. Hashimi and Satya Komatineni
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means,
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system, without the prior written permission of the copyright owner and the publisher.
ISBN-13 (pbk): 978-1-4302-1596-7
ISBN-13 (electronic): 978-1-4302-1597-4
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Contents at a Glance
About the Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
About the Technical Reviewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Acknowledgments ................................................................xix
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
CHAPter 1
Introducing the Android Computing Platform ......................1
CHAPter 2
Getting Your Feet Wet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CHAPter 3
Using Resources, Content Providers, and Intents .................43
CHAPter 4
Building User Interfaces and Using Controls . . . . . . . . . . . . . . . . . . . . 107
CHAPter 5
Working with Menus and Dialogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
CHAPter 6
Unveiling 2D Animation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
CHAPter 7
Exploring Security and Location-Based Services ................225
CHAPter 8
Building and Consuming Services ..............................263
CHAPter 9
Using the Media Framework and Telephony APIs . . . . . . . . . . . . . . . 301
CHAPter 10
Programming 3D Graphics with OpenGL ........................325
CHAPter 11
Managing and Organizing Preferences . . . . . . . . . . . . . . . . . . . . . . . . . 363
CHAPter 12
Coming to Grips with 1.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377
CHAPter 13
Simplifying OpenGL and Exploring Live Folders . . . . . . . . . . . . . . . . . 395
INDeX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
v
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Contents
About the Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
About the Technical Reviewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Acknowledgments ................................................................xix
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
CHAPter 1
Introducing the Android Computing Platform ..............1
History of Android . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Delving into the Dalvik VM .........................................4
Comparing Android and Java ME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Understanding the Android Software Stack . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Developing an End-User Application with the Android SDK .............9
The Android Emulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
The Android UI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
The Android Foundational Components ........................11
Advanced UI Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Android Service Components .................................13
Android Media and Telephony Components . . . . . . . . . . . . . . . . . . . . 14
Android Java Packages ......................................15
Taking Advantage of Android Source Code ..........................18
Summary .......................................................19
CHAPter 2
Getting Your Feet Wet .......................................21
Setting Up Your Environment ......................................21
Downloading JDK 6 and Eclipse 3.4 ...........................21
Downloading the Android SDK ................................22
Installing Android Development Tools (ADT) ....................22
Learning the Fundamental Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Activity ....................................................24
Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Content Provider ............................................25
Service ....................................................25
AndroidManifest.xml . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
vii
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viii
■ CONTENTS
Hello World! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Exploring the Structure of an Android Application ....................28
Analyzing the Notepad Application .................................30
Loading and Running the Notepad Application ..................31
Dissecting the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Examining the Application Lifecycle ................................38
Debugging Your App .............................................41
Summary .......................................................42
CHAPter 3
Using resources, Content Providers, and Intents . . . . . . . . 43
Understanding Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
String Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Layout Resources ...........................................45
Resource-Reference Syntax ..................................47
Defining Your Own Resource IDs for Later Use . . . . . . . . . . . . . . . . . . 48
Compiled and Noncompiled Android Resources .................48
Enumerating Key Android Resources ..........................49
Working with Arbitrary XML Resource Files . . . . . . . . . . . . . . . . . . . . 57
Working with Raw Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Working with Assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Reviewing the Resources Directory Structure ...................60
Understanding Content Providers ..................................60
Exploring Android’s Built-in Providers . . . . . . . . . . . . . . . . . . . . . . . . . 61
Architecture of Content Providers .............................67
Implementing Content Providers ..............................79
Understanding Intents ............................................91
Available Intents in Android . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Intents and Data URIs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Generic Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Using Extra Information ......................................96
Using Components to Directly Invoke an Activity ................97
Best Practice for Component Designers . . . . . . . . . . . . . . . . . . . . . . . 99
Understanding Intent Categories ..............................99
The Rules for Resolving Intents to Their Components ...........102
Exercising the ACTION_PICK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Exercising the GET_CONTENT Action .........................104
Summary ......................................................106
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