Beginning Android Tablet

Transcription

1 Beginning Android Tablet Programming Starting with Android Honeycomb for Tablets Robbie Matthews Apress*

2 Contents About the Author About the Technical Reviewer - Acknowledgments Some Notes on Using the Downloaded Code xiv xv xvi xvii Chapter 1: Getting Started 1 A Short, Personal History of Portable Programming 1 The Advent of Android 3 Preparing Your Computer 4 Installing Your Development Environment 4 Creating an Emulator Instance 5 Setting Your Path 6 Your First Android Program 6 Oh, No! Java! 9 A Quick Guide to Java 10 Structure 11 Primitives 12 Flow Control 12 Objects 13 Constructors, Initializers, and Overloading 17 Where's "Free"? 19 String Handling 20 v

3 a Packages 21 Lists and Maps 22 Generics 23 Inheritance and Interfaces 24 Annotations 25 And Many More 26 Summary 26 'S Chapter 2: How Android Works 27 Basic Structure of Android Programs 27 Lifecycle 38 Intents: What, Where, Why, and Are They Honorable? 42 Intent Filters 47 Common Intents 48 Finally 48 Secretly Linux 49 Summary m Chapter 3: What Can You Do with an Android Tablet? 53 More Sensors Than the CIA 54 Lights, Camera, Action 63 Browsing for Fun and Profit 64 Managing Your Assets 66 Getting Fancy 67 My Little Black Book Managing Contacts 69 Accessing Contacts 69 A Quick Side Trip into Lists 72 Different Things to Access 74 vi

4 Share My Stuff (Sending and Receiving, Well, Everything) 75 Bonus Stuff Menu Options 75 Sending 76 Sound and Fury (Managing Media Files) 77 Summary 78 Chapter 4: Beyond Java: Programming in Python and Friends 79 Why Use Another Language? 80 Getting Started 80 Script Management, 80 Help! I Need Somebody 82 Python Help 82 What's a Facade? 82 Intents (Again) 83 Different Ways of Using the Intent Methods 84 User Interaction 86 Events 89 Media Files 91 Controlling Your Phone 94 Where Am I? 95 Battery 97 Keeping the Device Awake 99 Editing Tips 100 Contacts and Phone Numbers 102 SQL 103 More Stuff 104 Summary 104 vii

5 Chapter 5: Project 1: Media Player 1 5 Fragments 105 What's a Fragment? 105 Examining the Example 106 TheActionBar 109 FragmentManager Media Player Application Displaying a List from a Cursor 114 Querying Media Files 115 Responding to Clicks 115 Some More on the ActionBar 115 Menu 116 Getting a Media URI 116 Playing Media 117 Different Media Sources 118 Dialog Boxes 118 Changing a List Cursor 120 Advanced Media Playing 120 Displaying Our Progress 121 Controlling Our Progress 122 Summary 122 Chapter 6: Explorer 123 Anatomy of a File Explorer 123 ListActivity for Fun and Profit 124 A Note on Resources 125 Build Your Own List Adapter 126 Inflation 128 Populating the List 128 viii

6 Finding Out About Your File 130 Learning to Mime 133 Dating Your File "133 Going Native 133 State Your Preference 137 Reading Your Preferences 139 Sorting Techniques 141 The Actual Activity 141 Reacting to a List Selection 142 Creation at Last 143 A Different Menu 144 Reacting to a Context Menu 144 Dialogs 145 A Few Last Bits 148 Making It Better 149 Summary 149 Chapter 7: Contact Manager 151 And Now for Something Completely Different 152 The Application 152 Anatomy of a Signpost 152 Knowing When the View Is Available 156 Room for Improvement 156 Backward Compatibility 157 List Handling 158 Saving the List 158 Reusing Your Libraries 159 Import and Export 159 A Last Note on Dialogs..160

7 s Managing Contacts 161 Loaders 162 Starting a Loader 163 How a Loader Works 163 Why a Loader? 163 The Search Bar 164 Contact Details 166 Editing Data 169 Adding a Phone Number 170 Changing Types 171 And Deleting 172 Summary 173 Chapter 8: Dude, Where's My Gar? 175 Location Manager 175 Location Providers 176 BAT3PGps 176 A Class to Handle the Location Manager 177 Location 181 The Application 183 The Compass 183 Bearing and Distance 185 Are We There Yet? 186 Wakeup Calls 186 Services 187 Notifications 188 Proximity Alerts 190 Proximity Alert Pros and Cons 192 x

8 Lists of Targets 193 Where Was That Again? 197 Whereto Go from Here? 198 Summary 198 s Chapter 9: Let the Games Begin! 199 Threads 199 Java Threads 200 Android Threads 203 Floater 203 SurfaceView 204 Using Your SurfaceHolder 207 Handlers 207 Using the Handler 208 Running the Game, 208 Handling Input 208 Custom Fonts 209 So What's an Asset? 210 Font Example 212 Menus: A Different Approach 212 Into the Third Dimension! 214 It's a Box 214 More Interprocess Communication Options 219 Summary 220 Chapter 10: Remind Me 221 Alarms 221 Pending Intents 222 Stopping an Alarm 222

9 Matching Pendinglntent Sending SMS Receiving SMS Text To Speech Queues SQLite Creating a SQLite Database ^ Getting Your Database 229 Using Your Database 229 The Application Using the Application 233 Contacts 233 Set Alarm 234 Alarms List 237 Testing HS 240 Enhancing the Application 241 Summary 241 Chapter 11: Everything Else 243 Timers 243 Stopping Gracefully 246 Doing Things in Background 247 Asking for Directions 251 The Download Manager 254 Querying Your Downloads 257 Animations 259 Defining an Animation 260 Interpolating... in Public, No Less xii

10 Loading Your Animation 262 USB 262 Programming Your USB 263 Responding to USB Events 265 Summary 267 And Finally 267 Index 269 xiii