Apress Android Recipes, A Problem-Solution Approach (2011).pdf

Android Recipes

A Problem-Solution Approach

■ ■ ■

Dave Smith

Jeff Friesen

Android Recipes: A Problem-Solution Approach

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ISBN-13 (pbk): 978-1-4302-3413-5

ISBN-13 (electronic): 978-1-4302-3414-2

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President and Publisher: Paul Manning

Lead Editor: Tom Welsh

Technical Reviewer: Paul Connolly

Editorial Board: Steve Anglin, Mark Beckner, Ewan Buckingham, Gary Cornell, Jonathan

Gennick, Jonathan Hassell, Michelle Lowman, Matthew Moodie, Jeff Olson, Jeffrey

Pepper, Frank Pohlmann, Douglas Pundick, Ben Renow-Clarke, Dominic

Shakeshaft, Matt Wade, Tom Welsh

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The source code for this book is available to readers at www.apress.com .

Contents

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Chapter 1: Getting Started with Android ......................................................... 1

What Is Android?.......................................................................................................................................................1

History of Android .....................................................................................................................................................2

Android Architecture .................................................................................................................................................3

App Architecture .......................................................................................................................................................7

Components .........................................................................................................................................................7

Intents ..................................................................................................................................................................9

Manifest .............................................................................................................................................................11

App Package ......................................................................................................................................................13

Activities in Depth ...................................................................................................................................................13

Services in Depth ....................................................................................................................................................19

Broadcast Receivers in Depth. ...............................................................................................................................25

Content Providers in Depth . ...................................................................................................................................26

1–1. Installing the Android SDK . .......................................................................................................................27

1–2. Installing an Android Platform . .................................................................................................................30

1–3. Creating an Android Virtual Device . ..........................................................................................................34

1–4. Starting the AVD. .......................................................................................................................................36

1–5. Introducing UC . .........................................................................................................................................41

1–6. Creating UC ................................................................................................................................................53

1–7. Installing and Running UC. ........................................................................................................................55

1–8. Preparing UC for Publishing. .....................................................................................................................59

1–9. Migrating to Eclipse . .................................................................................................................................63

1–10. Developing UC with Eclipse . ...................................................................................................................66

Summary ................................................................................................................................................................72

■ Chapter 2: User Interface Recipes ................................................................. 75

2–1. Customizing the Window ......................................................................................................................... 75

2–2. Creating and Displaying Views ................................................................................................................ 83

2–3. Monitoring Click Actions .......................................................................................................................... 85

2–4. Resolution-Independent Assets ............................................................................................................... 86

2–5. Locking Activity Orientation ..................................................................................................................... 88

2–6. Dynamic Orientation Locking................................................................................................................... 89

2–7. Manually Handling Rotation ..................................................................................................................... 91

2–8. Creating Pop-Up Menu Actions ................................................................................................................ 93

2–9. Customizing Options Menu ...................................................................................................................... 98

2–10. Customizing Back Button..................................................................................................................... 101

2–11. Emulating the Home Button ................................................................................................................. 102

2–12. Monitoring TextView Changes ............................................................................................................. 103

2–13. Scrolling TextView Ticker .................................................................................................................... 106

2–14. Animating a View ................................................................................................................................. 107

2–15. Creating Drawables as Backgrounds................................................................................................... 115

2–16. Creating Custom State Drawables ....................................................................................................... 119

2–17. Applying Masks to Images................................................................................................................... 121

2–18. Creating Dialogs that Persist ............................................................................................................... 125

2–19. Implementing Situation-Specific Layouts ............................................................................................ 127

2–20. Customizing Keyboard Actions ............................................................................................................ 132

2–21. Dismissing Soft Keyboard.................................................................................................................... 135

2–22. Customizing AdapterView Empty Views .............................................................................................. 136

2–23. Customizing ListView Rows ................................................................................................................. 138

2–24. Making ListView Section Headers ....................................................................................................... 142

2–25. Creating Compound Controls ............................................................................................................... 145

Useful Tools to Know: DroidDraw ....................................................................................................................... 148

Obtaining and Launching DroidDraw ............................................................................................................. 149

Exploring DroidDraw’s User Interface............................................................................................................ 150

Creating a Simple Screen .............................................................................................................................. 151

Summary ............................................................................................................................................................ 153

Chapter 3: Communications and Networking.............................................. 155

3–1. Displaying Web Information................................................................................................................... 155

3–2. Intercepting WebView Events ................................................................................................................ 159

3–3. Accessing WebView with JavaScript ..................................................................................................... 161

3–4. Downloading an Image File ................................................................................................................... 163

3–5. Downloading Completely in the Background ......................................................................................... 166

3–6. Accessing a REST API ............................................................................................................................ 170

3–7. Parsing JSON ......................................................................................................................................... 176

3–8. Parsing XML........................................................................................................................................... 180

3–8. Receiving SMS ....................................................................................................................................... 184

3–9. Sending an SMS Message ..................................................................................................................... 186

3–10. Communicating over Bluetooth ........................................................................................................... 188

3–11. Querying Network Reachability ........................................................................................................... 197

Summary ............................................................................................................................................................ 198

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■ Chapter 4: Interacting with Device Hardware and Media ........................... 201

4–1. Integrating Device Location ................................................................................................................... 201

4–2. Mapping Locations................................................................................................................................. 205

4–3. Annotating Maps.................................................................................................................................... 209

4–4. Capturing Images and Video .................................................................................................................. 216

4–5. Making a Custom Camera Overlay......................................................................................................... 221

4–6. Recording Audio..................................................................................................................................... 227

4–7. Adding Speech Recognition ................................................................................................................... 229

4–8. Playing Back Audio/Video ...................................................................................................................... 231

4–9. Creating a Tilt Monitor ........................................................................................................................... 240

4–10. Monitoring Compass Orientation ......................................................................................................... 243

Useful Tools to Know: SensorSimulator .............................................................................................................. 247

Obtaining Sensor Simulator ........................................................................................................................... 248

Launching Sensor Simulator Settings and Sensor Simulator ........................................................................ 248

Accessing Sensor Simulator from Your Apps ................................................................................................ 253

Summary ............................................................................................................................................................ 255

Chapter 5: Persisting Data .......................................................................... 257

5–1. Making a Preference Screen ................................................................................................................. 257

5–2. Persisting Simple Data .......................................................................................................................... 262

5–3. Reading and Writing Files ...................................................................................................................... 266

5–4. Using Files as Resources ....................................................................................................................... 271

5–5. Managing a Database ............................................................................................................................ 274

5–6. Querying a Database.............................................................................................................................. 279

5–7. Backing Up Data .................................................................................................................................... 281

5–8. Sharing Your Database .......................................................................................................................... 286

5–9. Sharing Your Other Data ........................................................................................................................ 292

Useful Tools to Know: SQLite3 ............................................................................................................................ 298

SQLite3 and UC .............................................................................................................................................. 300

Summary ............................................................................................................................................................ 308

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Chapter 6: Interacting with the System ...................................................... 309

6–1. Notifying from the Background.............................................................................................................. 309

6–2. Creating Timed and Periodic Tasks ....................................................................................................... 313

6–3. Scheduling a Periodic Task ................................................................................................................... 315

6–4. Creating Sticky Operations .................................................................................................................... 319

6–5. Running Persistent Background Operations .......................................................................................... 324

6–6. Launching Other Applications ................................................................................................................ 330

6–7. Launching System Applications ............................................................................................................. 333

6–8. Letting Other Applications Launch Yours............................................................................................... 338

6–9. Interacting with Contacts....................................................................................................................... 340

6–10. Picking Device Media........................................................................................................................... 347

6–11. Saving to the MediaStore .................................................................................................................... 349

Summary ............................................................................................................................................................ 352

■ Chapter 7: Working with Libraries .............................................................. 353

7–1. Creating Java Library JARs.................................................................................................................... 353

7–2. Using Java Library JARs ........................................................................................................................ 356

7–3. Creating Android Library Projects .......................................................................................................... 359

7–4. Using Android Library Projects .............................................................................................................. 363

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