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Beginning Android 3
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Mark Murphy
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Beginning Android 3
Copyright © 2011 by Mark Murphy
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any
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ISBN-13 (pbk): 978-1-4302-3297-1
ISBN-13 (electronic): 978-1-4302-3298-8
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Editorial Board: Steve Anglin, Mark Beckner, Ewan Buckingham, Gary Cornell, Jonathan
Gennick, Jonathan Hassell, Michelle Lowman, Matthew Moodie, James Markham,
Jeff Olson, Jeffrey Pepper, Frank Pohlmann, Douglas Pundick, Ben Renow-Clarke,
Dominic Shakeshaft, Matt Wade, Tom Welsh
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Copy Editor: William McManus
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Contents
Part I: Core Concept............................................................................................ 1
■ Chapter 1: The Big Picture............................................................................... 3
Benefits and Drawbacks of Smartphone Programming.......................................................................................... 3
What Androids Are Made Of.................................................................................................................................... 4
Stuff at Your Disposal ............................................................................................................................................. 5
The Big Picture...of This Book................................................................................................................................. 6
■ Chapter 2: How to Get Started ......................................................................... 7
Step 1: Set Up Java................................................................................................................................................. 7
Install the JDK.................................................................................................................................................... 7
Learn Java ......................................................................................................................................................... 8
Step 2: Install the Android SDK ............................................................................................................................... 8
Install the Base Tools......................................................................................................................................... 8
Install the SDKs and Add-ons ............................................................................................................................ 9
Step 3: Install the ADT for Eclipse......................................................................................................................... 12
Step 4: Install Apache Ant..................................................................................................................................... 14
Step 5: Set Up the Emulator.................................................................................................................................. 15
Step 6: Set Up the Device ..................................................................................................................................... 21
Windows .......................................................................................................................................................... 21
Mac OS X and Linux ......................................................................................................................................... 22
■ Chapter 3: Your First Android Project ........................................................... 23
Step 1: Create the New Project............................................................................................................................. 23
Eclipse ............................................................................................................................................................. 23
Command Line ................................................................................................................................................. 26
Step 2: Build, Install, and Run the Application in Your Emulator or Device .......................................................... 27
Eclipse ................................................................................................................................ ............................. 27
Command Line ................................................................................................................................................. 28
■
Chapter 4: Examining Your First Project ....................................................... 31
Project Structure................................................................................................................................................... 31
Root Contents .................................................................................................................................................. 31
The Sweat Off Your Brow................................................................................................................................. 32
And Now, the Rest of the Story........................................................................................................................ 32
What You Get Out of It...................................................................................................................................... 33
Inside Your Manifest ............................................................................................................................................. 33
In the Beginning, There Was the Root, and It Was Good.................................................................................. 34
An Application for Your Application ................................................................................................................. 35
■
Chapter 5: A Bit About Eclipse....................................................................... 37
What the ADT Gives You........................................................................................................................................ 37
Coping with Eclipse .............................................................................................................................................. 38
How to Import a Non-Eclipse Project ............................................................................................................... 38
How to Get to DDMS ........................................................................................................................................ 42
How to Create an Emulator .............................................................................................................................. 43
How to Run a Project ....................................................................................................................................... 44
How Not to Run Your Project ........................................................................................................................... 45
Alternative IDEs..................................................................................................................................................... 45
IDEs and This Book ............................................................................................................................................... 46
■ Chapter 6: Enhancing Your First Project ....................................................... 47
Supporting Multiple Screen Sizes......................................................................................................................... 47
Specifying Versions .............................................................................................................................................. 48
Part II: Activities ............................................................................................... 49
■
Chapter 7: Rewriting Your First Project ........................................................ 51
The Activity ........................................................................................................................................................... 51
Dissecting the Activity .......................................................................................................................................... 52
Building and Running the Activity ......................................................................................................................... 53
■
Chapter 8: Using XML-Based Layouts ........................................................... 55
What Is an XML-Based Layout? ............................................................................................................................ 55
Why Use XML-Based Layouts? ............................................................................................................................. 55
OK, So What Does It Look Like? ............................................................................................................................ 56
What’s with the @ Signs?..................................................................................................................................... 57
And How Do We Attach These to the Java? .......................................................................................................... 57
The Rest of the Story ............................................................................................................................................ 58
■
Chapter 9: Employing Basic Widgets............................................................. 61
Assigning Labels ................................................................................................................................................... 61
Button, Button, Who’s Got the Button? ................................................................................................................. 62
Fleeting Images .................................................................................................................................................... 63
Fields of Green…or Other Colors.......................................................................................................................... 64
Just Another Box to Check.................................................................................................................................... 66
Turn the Radio Up ................................................................................................................................................. 68
It’s Quite a View .................................................................................................................................................... 70
Padding ............................................................................................................................................................ 70
Other Useful Properties.................................................................................................................................... 71
Useful Methods ................................................................................................................................................ 71
Colors ............................................................................................................................................................... 71
■
Chapter 10: Working with Containers ........................................................... 73
Thinking Linearly .................................................................................................................................................. 73
LinearLayout Concepts and Properties ............................................................................................................ 74
LinearLayout Example...................................................................................................................................... 76
The Box Model ................................................................................................................................................. 80
All Things Are Relative .......................................................................................................................................... 81
RelativeLayout Concepts and Properties ................................ ......................................................................... 82
RelativeLayout Example................................................................................................................................... 84
Overlap ............................................................................................................................................................. 86
Tabula Rasa .......................................................................................................................................................... 87
TableLayout Concepts and Properties ............................................................................................................. 87
TableLayout Example....................................................................................................................................... 89
Scrollwork ............................................................................................................................................................. 90
■
Chapter 11: The Input Method Framework.................................................... 93
Keyboards, Hard and Soft ..................................................................................................................................... 93
Tailored to Your Needs.......................................................................................................................................... 94
Tell Android Where It Can Go ................................................................................................................................ 98
Fitting In.............................................................................................................................................................. 100
Jane, Stop This Crazy Thing! .............................................................................................................................. 101
■
Chapter 12: Using Selection Widgets .......................................................... 103
Adapting to the Circumstances........................................................................................................................... 103
Using ArrayAdapter ........................................................................................................................................ 104
Lists of Naughty and Nice ................................................................................................................................... 104
Selection Modes ............................................................................................................................................ 106
Spin Control ........................................................................................................................................................ 108
Grid Your Lions (or Something Like That...) ........................................................................................................ 111
Fields: Now with 35% Less Typing! .................................................................................................................... 115
Galleries, Give or Take the Art ............................................................................................................................ 118
■
Chapter 13: Getting Fancy with Lists .......................................................... 119
Getting to First Base ........................................................................................................................................... 119
A Dynamic Presentation...................................................................................................................................... 121
Inflating Rows Ourselves .................................................................................................................................... 123
A Sidebar About Inflation ............................................................................................................................... 123
And Now, Back to Our Story .......................................................................................................................... 125
Better. Stronger. Faster. ..................................................................................................................................... 125
Using convertView ......................................................................................................................................... 125
Using the Holder Pattern................................................................................................................................ 127
Interactive Rows ................................................................................................................................................. 129
■ Chapter 14: Still More Widgets and Containers........................................... 135
Pick and Choose ................................................................................................................................................. 135
Time Keeps Flowing Like a River ........................................................................................................................ 140
Seeking Resolution ............................................................................................................................................. 141
Putting It on My Tab ............................................................................................................................................ 142
The Pieces ..................................................................................................................................................... 143
Wiring It Together .......................................................................................................................................... 144
Adding Them Up............................................................................................................................................. 146

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