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Professional android 4 application development [www.itepress.com]
Professional android 4 application development [www.itepress.com]
Professional android 4 application development [www.itepress.com]
Professional android 4 application development [www.itepress.com]
Professional android 4 application development [www.itepress.com]
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Professional android 4 application development [www.itepress.com]
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Professional android 4 application development [www.itepress.com]
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Professional android 4 application development [www.itepress.com]
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Professional android 4 application development [www.itepress.com]
Professional android 4 application development [www.itepress.com]
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  • 1. www.it-ebooks.info
  • 2. Meier02275 ffirs V2 - 03/22/2012 www.it-ebooks.infoffirs.indd ii 4/11/2012 10:37:19 AM
  • 3. Meier02275 ffirs V2 - 03/22/2012 PROFESSIONAL ANDROID™ 4 APPLICATION DEVELOPMENT INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxvii CHAPTER 1 Hello, Android . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 CHAPTER 2 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 CHAPTER 3 Creating Applications and Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 CHAPTER 4 Building User Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 CHAPTER 5 Intents and Broadcast Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 CHAPTER 6 Using Internet Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 CHAPTER 7 Files, Saving State, and Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221 CHAPTER 8 Databases and Content Providers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 CHAPTER 9 Working in the Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 CHAPTER 10 Expanding the User Experience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359 CHAPTER 11 Advanced User Experience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425 CHAPTER 12 Hardware Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481 CHAPTER 13 Maps, Geocoding, and Location-Based Services . . . . . . . . . . . . . . . . . 513 CHAPTER 14 Invading the Home Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 565 CHAPTER 15 Audio, Video, and Using the Camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . 621 CHAPTER 16 Bluetooth, NFC, Networks, and Wi-Fi. . . . . . . . . . . . . . . . . . . . . . . . . . . . 665 CHAPTER 17 Telephony and SMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701 CHAPTER 18 Advanced Android Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739 CHAPTER 19 Monetizing, Promoting, and Distributing Applications . . . . . . . . . . . . . .771 INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 787 www.it-ebooks.infoffirs.indd i 4/11/2012 10:37:18 AM
  • 4. Meier02275 ffirs V2 - 03/22/2012 www.it-ebooks.infoffirs.indd ii 4/11/2012 10:37:19 AM
  • 5. 12 Meier02275 ffirs V2 - 03/22/2012 PROFESSIONAL Android™ 4 Application Development www.it-ebooks.info ffirs.indd iii 4/11/2012 10:37:19 AM
  • 6. Meier02275 ffirs V2 - 03/22/2012 www.it-ebooks.infoffirs.indd iv 4/11/2012 10:37:19 AM
  • 7. Meier02275 ffirs V2 - 03/22/2012 PROFESSIONAL Android™ 4 Application Development Reto Meier www.it-ebooks.infoffirs.indd v 4/11/2012 10:37:19 AM
  • 8. Book Title <Chapter No> V2 - MM/DD/2010 Professional Android™ 4 Application Development Published by John Wiley & Sons, Inc. 10475 Crosspoint Boulevard Indianapolis, IN 46256 www.wiley.com Copyright © 2012 by John Wiley & Sons, Inc., Indianapolis, Indiana Published simultaneously in Canada ISBN: 978-1-118-10227-5 ISBN: 978-1-118-22385-7 (ebk) ISBN: 978-1-118-23722-9 (ebk) ISBN: 978-1-118-26215-3 (ebk) Manufactured in the United States of America 10 9 8 7 6 5 4 3 2 1 No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, elec- tronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through pay- ment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http:// www.wiley.com/go/permissions. Limit of Liability/Disclaimer of Warranty: The publisher and the author make no representations or warranties with respect to the accuracy or completeness of the contents of this work and specifically disclaim all warranties, including without limitation warranties of fitness for a particular purpose. No warranty may be created or extended by sales or promotional materials. The advice and strategies contained herein may not be suitable for every situation. This work is sold with the understanding that the publisher is not engaged in rendering legal, accounting, or other professional services. If professional assistance is required, the services of a competent professional person should be sought. Neither the publisher nor the author shall be liable for damages arising herefrom. The fact that an organization or Web site is referred to in this work as a citation and/or a potential source of further information does not mean that the author or the publisher endorses the information the organization or Web site may provide or recommendations it may make. Further, readers should be aware that Internet Web sites listed in this work may have changed or disappeared between when this work was written and when it is read. For general information on our other products and services please contact our Customer Care Department within the United States at (877) 762-2974, outside the United States at (317) 572-3993 or fax (317) 572-4002. Wiley publishes in a variety of print and electronic formats and by print-on-demand. Some material included with standard print versions of this book may not be included in e-books or in print-on-demand. If this book refers to media such as a CD or DVD that is not included in the version you purchased, you may download this material at http://booksupport .wiley.com. For more information about Wiley products, visit www.wiley.com. Library of Congress Control Number: 2011945019 Trademarks: Wiley, the Wiley logo, Wrox, the Wrox logo, Wrox Programmer to Programmer, and related trade dress are trademarks or registered trademarks of John Wiley & Sons, Inc. and/or its affi liates, in the United States and other countries, and may not be used without written permission. Android is a trademark of Google, Inc. All other trademarks are the property of their respective owners. John Wiley & Sons, Inc., is not associated with any product or vendor mentioned in this book. www.it-ebooks.infoffirs.indd vi 4/11/2012 10:37:21 AM
  • 9. 10 Meier02275 ffirs V2 - 03/22/2012 To Kris www.it-ebooks.info ffirs.indd vii 4/11/2012 10:37:21 AM
  • 10. Meier02275 ffirs V2 - 03/22/2012 www.it-ebooks.infoffirs.indd viii 4/11/2012 10:37:21 AM
  • 11. 12 Meier02275 ffirs V2 - 03/22/2012 ABOUT THE AUTHOR RETO MEIER grew up in Perth, Western Australia, and then lived in London for 6 years before moving to the San Francisco Bay Area in 2011. Reto currently works as a Developer Advocate on the Android team at Google, helping Android developers create the best applications possible. Reto is an experienced software developer with more than 10 years of experience in GUI application development. Before coming to Google, he worked in various industries, including offshore oil and gas and fi nance. Always interested in emerging technologies, Reto has been involved in Android since the initial release in 2007. You can fi nd out entirely too much about Reto’s interests and hobbies on his web site, The Radioactive Yak (http://blog.radioactiveyak.com), or on Google+ (http://profiles .google.com/reto.meier) or Twitter (www.twitter.com/retomeier), where he shares more than he probably should. www.it-ebooks.info ffirs.indd ix 4/11/2012 10:37:21 AM
  • 12. Meier02275 ffirs V2 - 03/22/2012 www.it-ebooks.infoffirs.indd x 4/11/2012 10:37:22 AM
  • 13. 12 Meier02275 ffirs V2 - 03/22/2012 ABOUT THE TECHNICAL EDITOR DAN ULERY is a software engineer with experience in .NET, Java, and PHP development, as well as in deployment engineering. He graduated from the University of Idaho with a Bachelor of Science degree in computer science and a minor in mathematics. www.it-ebooks.info ffirs.indd xi 4/11/2012 10:37:22 AM
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  • 15. 12 Book Title <Chapter No> V2 - MM/DD/2010 CREDITS EXECUTIVE EDITOR PRODUCTION MANAGER Robert Elliott Tim Tate PROJECT EDITOR VICE PRESIDENT AND EXECUTIVE GROUP John Sleeva PUBLISHER Richard Swadley TECHNICAL EDITOR Dan Ulery VICE PRESIDENT AND EXECUTIVE PUBLISHER Neil Edde PRODUCTION EDITOR Kathleen Wisor ASSOCIATE PUBLISHER Jim Minatel COPY EDITOR San Dee Phillips PROJECT COORDINATOR, COVER Katie Crocker EDITORIAL MANAGER Mary Beth Wakefield PROOFREADER Jen Larsen, Word One New York FREELANCER EDITORIAL MANAGER Rosemarie Graham INDEXER Johnna VanHoose Dinse ASSOCIATE DIRECTOR OF MARKETING David Mayhew COVER DESIGNER Ryan Sneed MARKETING MANAGER Ashley Zurcher COVER IMAGE © Linda Bucklin / iStockPhoto BUSINESS MANAGER Amy Knies www.it-ebooks.info ffirs.indd xiii 4/11/2012 10:37:22 AM
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  • 17. 12 Meier02275 ffirs V2 - 03/22/2012 ACKNOWLEDGMENTS FIRST, I’D LIKE TO THANK KRISTY, whose love, patience, and understanding are pushed to new limits every time I forget what’s involved in writing a book and agree to do another one. Your support makes everything I do possible. A big thank you to my friends and colleagues at Google, particularly the Android engineers and my colleagues in developer relations. The pace at which Android grows makes life difficult for those of us who choose to write books, but the opportunities it creates for developers makes the stress and rewrites easy to bear. I also thank Dan Ulery for his sharp eye and valuable insights; Robert Elliot and John Sleeva for their patience in waiting for me to get this book fi nished; San Dee Phillips; and the whole team at Wrox for helping to get it done. A special shout-out goes out to the entire Android developer community. Your passion, hard work, and excellent applications have helped make Android the huge success that it is. Thank you. www.it-ebooks.info ffirs.indd xv 4/11/2012 10:37:22 AM
  • 18. Meier02275 ffirs V2 - 03/22/2012 www.it-ebooks.infoffirs.indd xvi 4/11/2012 10:37:22 AM
  • 19. Meier02275 ftoc V2 - 03/22/2012 CONTENTS INTRODUCTION xxxvii CHAPTER 1: HELLO, ANDROID 1 A Little Background 2 The Not-So-Distant Past 2 Living in the Future 3 What Android Isn’t 3 Android: An Open Platform for Mobile Development 4 Native Android Applications 5 Android SDK Features 6 Access to Hardware, Including Camera, GPS, and Sensors 6 Data Transfers Using Wi-Fi, Bluetooth, and NFC 7 Maps, Geocoding, and Location-Based Services 7 Background Services 7 SQLite Database for Data Storage and Retrieval 8 Shared Data and Inter-Application Communication 8 Using Widgets and Live Wallpaper to Enhance the Home Screen 9 Extensive Media Support and 2D/3D Graphics 9 Cloud to Device Messaging 9 Optimized Memory and Process Management 10 Introducing the Open Handset Alliance 10 What Does Android Run On? 10 Why Develop for Mobile? 11 Why Develop for Android? 11 Factors Driving Android’s Adoption 12 What Android Has That Other Platforms Don’t Have 12 The Changing Mobile Development Landscape 13 Introducing the Development Framework 14 What Comes in the Box 14 Understanding the Android Software Stack 15 The Dalvik Virtual Machine 16 Android Application Architecture 17 Android Libraries 18 www.it-ebooks.infoftoc.indd xvii 4/11/2012 10:34:48 AM
  • 20. Meier02275 ftoc V2 - 03/22/2012 CONTENTS CHAPTER 2: GETTING STARTED 19 Developing for Android 20 What You Need to Begin 20 Downloading and Installing the Android SDK 21 Downloading and Installing Updates to the SDK 23 Developing with Eclipse 23 Using the Android Developer Tools Plug-In for Eclipse 24 Using the Support Package 27 Creating Your First Android Application 28 Creating a New Android Project 28 Creating an Android Virtual Device 30 Creating Launch Configurations 30 Running and Debugging Your Android Application 33 Understanding Hello World 33 Types of Android Applications 36 Foreground Applications 36 Background Applications 37 Intermittent Applications 37 Widgets and Live Wallpapers 37 Developing for Mobile and Embedded Devices 38 Hardware-Imposed Design Considerations 38 Be Efficient 38 Expect Limited Capacity 39 Design for Different Screens 39 Expect Low Speeds, High Latency 40 At What Cost? 41 Considering the User’s Environment 42 Developing for Android 43 Being Fast and Efficient 43 Being Responsive 44 Ensuring Data Freshness 45 Developing Secure Applications 45 Ensuring a Seamless User Experience 46 Providing Accessibility 47 Android Development Tools 47 The Android Virtual Device Manager 48 Android SDK Manager 49 The Android Emulator 50 xviii www.it-ebooks.infoftoc.indd xviii 4/11/2012 10:34:49 AM
  • 21. Meier02275 ftoc V2 - 03/22/2012 CONTENTS The Dalvik Debug Monitor Service 50 The Android Debug Bridge 51 The Hierarchy Viewer and Lint Tool 51 Monkey and Monkey Runner 52 CHAPTER 3: CREATING APPLICATIONS AND ACTIVITIES 53 What Makes an Android Application? 54 Introducing the Application Manifest File 55 A Closer Look at the Application Manifest 56 Using the Manifest Editor 63 Externalizing Resources 64 Creating Resources 65 Simple Values 65 Styles and Themes 68 Drawables 68 Layouts 69 Animations 70 Menus 73 Using Resources 74 Using Resources in Code 74 Referencing Resources Within Resources 75 Using System Resources 76 Referring to Styles in the Current Theme 76 Creating Resources for Different Languages and Hardware 77 Runtime Configuration Changes 79 The Android Application Lifecycle 81 Understanding an Application’s Priority and Its Process’ States 82 Introducing the Android Application Class 83 Extending and Using the Application Class 83 Overriding the Application Lifecycle Events 84 A Closer Look at Android Activities 86 Creating Activities 86 The Activity Lifecycle 87 Activity Stacks 88 Activity States 88 Monitoring State Changes 89 Understanding Activity Lifetimes 91 Android Activity Classes 93 xix www.it-ebooks.infoftoc.indd xix 4/11/2012 10:34:49 AM
  • 22. Meier02275 ftoc V2 - 03/22/2012 CONTENTS CHAPTER 4: BUILDING USER INTERFACES 95 Fundamental Android UI Design 96 Android User Interface Fundamentals 97 Assigning User Interfaces to Activities 97 Introducing Layouts 98 Defining Layouts 99 Using Layouts to Create Device Independent User Interfaces 100 Using a Linear Layout 100 Using a Relative Layout 101 Using a Grid Layout 102 Optimizing Layouts 103 Redundant Layout Containers Are Redundant 103 Avoid Using Excessive Views 105 Using Lint to Analyze Your Layouts 106 To-Do List Example 107 Introducing Fragments 114 Creating New Fragments 115 The Fragment Lifecycle 116 Fragment-Specific Lifecycle Events 119 Fragment States 119 Introducing the Fragment Manager 120 Adding Fragments to Activities 120 Using Fragment Transactions 121 Adding, Removing, and Replacing Fragments 122 Using the Fragment Manager to Find Fragments 122 Populating Dynamic Activity Layouts with Fragments 123 Fragments and the Back Stack 124 Animating Fragment Transactions 125 Interfacing Between Fragments and Activities 126 Fragments Without User Interfaces 126 Android Fragment Classes 128 Using Fragments for Your To-Do List 128 The Android Widget Toolbox 132 Creating New Views 133 Modifying Existing Views 133 Customizing Your To-Do List 135 Creating Compound Controls 138 Creating Simple Compound Controls Using Layouts 141 Creating Custom Views 141 Creating a New Visual Interface 142 Handling User Interaction Events 147 xx www.it-ebooks.infoftoc.indd xx 4/11/2012 10:34:49 AM
  • 23. Meier02275 ftoc V2 - 03/22/2012 CONTENTS Supporting Accessibility in Custom Views 148 Creating a Compass View Example 149 Using Custom Controls 155 Introducing Adapters 156 Introducing Some Native Adapters 156 Customizing the Array Adapter 156 Using Adapters to Bind Data to a View 158 Customizing the To-Do List Array Adapter 158 Using the Simple Cursor Adapter 162 CHAPTER 5: INTENTS AND BROADCAST RECEIVERS 165 Introducing Intents 166 Using Intents to Launch Activities 166 Explicitly Starting New Activities 167 Implicit Intents and Late Runtime Binding 167 Determining If an Intent Will Resolve 168 Returning Results from Activities 169 Native Android Actions 172 Introducing Linkify 174 Native Linkify Link Types 174 Creating Custom Link Strings 175 Using the Match Filter 176 Using the Transform Filter 176 Using Intents to Broadcast Events 177 Broadcasting Events with Intents 177 Listening for Broadcasts with Broadcast Receivers 178 Broadcasting Ordered Intents 180 Broadcasting Sticky Intents 181 Introducing the Local Broadcast Manager 182 Introducing Pending Intents 182 Creating Intent Filters and Broadcast Receivers 183 Using Intent Filters to Service Implicit Intents 183 How Android Resolves Intent Filters 185 Finding and Using Intents Received Within an Activity 186 Passing on Responsibility 187 Selecting a Contact Example 187 Using Intent Filters for Plug-Ins and Extensibility 193 Supplying Anonymous Actions to Applications 193 Discovering New Actions from Third-Party Intent Receivers 194 Incorporating Anonymous Actions as Menu Items 195 Listening for Native Broadcast Intents 196 xxi www.it-ebooks.infoftoc.indd xxi 4/11/2012 10:34:49 AM
  • 24. Meier02275 ftoc V2 - 03/22/2012 CONTENTS Monitoring Device State Changes Using Broadcast Intents 197 Listening for Battery Changes 197 Listening for Connectivity Changes 198 Listening for Docking Changes 199 Managing Manifest Receivers at Run Time 199 CHAPTER 6: USING INTERNET RESOURCES 201 Downloading and Parsing Internet Resources 201 Connecting to an Internet Resource 202 Parsing XML Using the XML Pull Parser 203 Creating an Earthquake Viewer 205 Using the Download Manager 210 Downloading Files 211 Customizing Download Manager Notifications 213 Specifying a Download Location 213 Cancelling and Removing Downloads 214 Querying the Download Manager 215 Using Internet Services 217 Connecting to Google App Engine 218 Best Practices for Downloading Data Without Draining the Battery 219 CHAPTER 7: FILES, SAVING STATE, AND PREFERENCES 221 Saving Simple Application Data 222 Creating and Saving Shared Preferences 222 Retrieving Shared Preferences 223 Creating a Settings Activity for the Earthquake Viewer 223 Introducing the Preference Framework and the Preference Activity 231 Defining a Preference Screen Layout in XML 232 Native Preference Controls 234 Using Intents to Import System Preferences into Preference Screens 234 Introducing the Preference Fragment 235 Defining the Preference Fragment Hierarchy Using Preference Headers 235 Introducing the Preference Activity 236 Backward Compatibility and Preference Screens 237 Finding and Using the Shared Preferences Set by Preference Screens 238 Introducing On Shared Preference Change Listeners 238 xxii www.it-ebooks.infoftoc.indd xxii 4/11/2012 10:34:49 AM
  • 25. Meier02275 ftoc V2 - 03/22/2012 CONTENTS Creating a Standard Preference Activity for the Earthquake Viewer 238 Persisting the Application Instance State 242 Saving Activity State Using Shared Preferences 242 Saving and Restoring Activity Instance State Using the Lifecycle Handlers 242 Saving and Restoring Fragment Instance State Using the Lifecycle Handlers 243 Including Static Files as Resources 245 Working with the File System 246 File-Management Tools 246 Using Application-Specific Folders to Store Files 246 Creating Private Application Files 247 Using the Application File Cache 248 Storing Publicly Readable Files 248 CHAPTER 8: DATABASES AND CONTENT PROVIDERS 251 Introducing Android Databases 252 SQLite Databases 252 Content Providers 252 Introducing SQLite 253 Content Values and Cursors 253 Working with SQLite Databases 254 Introducing the SQLiteOpenHelper 255 Opening and Creating Databases Without the SQLite Open Helper 257 Android Database Design Considerations 257 Querying a Database 257 Extracting Values from a Cursor 259 Adding, Updating, and Removing Rows 260 Inserting Rows 260 Updating Rows 261 Deleting Rows 261 Creating Content Providers 262 Registering Content Providers 262 Publishing Your Content Provider’s URI Address 263 Creating the Content Provider’s Database 264 Implementing Content Provider Queries 264 Content Provider Transactions 266 Storing Files in a Content Provider 268 A Skeleton Content Provider Implementation 270 xxiii www.it-ebooks.infoftoc.indd xxiii 4/11/2012 10:34:49 AM
  • 26. Meier02275 ftoc V2 - 03/22/2012 CONTENTS Using Content Providers 274 Introducing the Content Resolver 274 Querying Content Providers 274 Querying for Content Asynchronously Using the Cursor Loader 277