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Under Construction: The book you’re reading is still under
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Andy & Dave
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Rapid Android Development
Build Rich, Sensor-Based Applications with Processing
Daniel Sauter
The Pragmatic Bookshelf
Dallas, Texas • Raleigh, North Carolina
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Many of the designations used by manufacturers and sellers to distinguish their products
are claimed as trademarks. Where those designations appear in this book, and The Pragmatic
Programmers, LLC was aware of a trademark claim, the designations have been printed in
initial capital letters or in all capitals. The Pragmatic Starter Kit, The Pragmatic Programmer,
Pragmatic Programming, Pragmatic Bookshelf, PragProg and the linking g device are trade-
marks of The Pragmatic Programmers, LLC.
Every precaution was taken in the preparation of this book. However, the publisher assumes
no responsibility for errors or omissions, or for damages that may result from the use of
information (including program listings) contained herein.
Our Pragmatic courses, workshops, and other products can help you and your team create
better software and have more fun. For more information, as well as the latest Pragmatic
titles, please visit us at http://pragprog.com.
Copyright © 2012 The Pragmatic Programmers, LLC.
All rights reserved.
No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form, or by any means, electronic, mechanical, photocopying,
recording, or otherwise, without the prior consent of the publisher.
Printed in the United States of America.
ISBN-13: 978-1-93778-506-2
Encoded using the finest acid-free high-entropy binary digits.
Book version: B4.0—November 12, 2012
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Contents
Change History . . . . . . . . . . . . ix
Acknowledgments . . . . . . . . . . . xi
Preface . . . . . . . . . . . . . . xiii
Part I — Getting Started with the Touch Screen and Android Sensors
1. Getting Started . . . . . . . . . . . . 3
1.1 Install the Required Software 4
1.2 Write Your First Android Sketch 6
1.3 Run a Sketch in the Android Emulator 13
1.4 Run a Sketch on an Android Device 15
1.5 Wrapping Up 16
2. Working With The Touch Screen Display . . . . . . 17
2.1 Work with the Android Touch Screen 18
2.2 Control Grayscale Values Using motionPressure 21
2.3 Using Colors 24
2.4 Use Touch Screen Pressure to Control Color Hues 28
2.5 Introducing the Ketai Library 31
2.6 Install the Ketai library 33
2.7 Working With the KetaiGestureClass 34
2.8 Detect Multi-Touch Gestures 35
2.9 Wrapping Up 42
3. Using Motion and Position Sensors . . . . . . . 43
3.1 Introducing the Device Hardware and Software Layers 44
3.2 Introducing Common Android Sensors 45
3.3 Working With the KetaiSensor Class 47
3.4 List the Built-in Sensors on an Android Device 47
3.5 Display Values from the Accelerometer 50
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3.6 Display Values from Multiple Sensors 53
3.7 Build a Motion-based Color Mixer and Palette 57
3.8 Save a Color 61
3.9 Build a Palette of Colors 64
3.10 Erase a Palette with a Shake 68
3.11 Wrapping Up 72
Part II — Working with Camera and Location Devices
4. Using Geolocation and Compass . . . . . . . . 77
4.1 Introducing the Location Manager 78
4.2 Working With the KetaiLocation Class 80
4.3 Determine Your Location 81
4.4 Setting Sketch Permissions 83
4.5 Working With the Location Class 86
4.6 Determine the Distance Between Two Locations 87
4.7 Determine the Speed and Bearing of a Moving Device 90
4.8 Find Your Way to a Destination 92
4.9 Find a Significant Other (Device) 96
4.10 Wrapping Up 100
5. Using Android Cameras . . . . . . . . . 103
5.1 Introducing the Android Camera and APIs 104
5.2 Working With the KetaiCamera Class 105
5.3 Display a Back-Facing Camera Full-Screen Preview 106
5.4 Toggle Between the Front- and Back-Facing Cameras 110
5.5 Snap and Save Pictures 114
5.6 Superimpose and Combine Images 119
5.7 Detect and Trace the Motion of Colored Objects 125
5.8 Detect Faces 131
5.9 Wrapping Up 135
Part III — Using Peer-To-Peer Networking
6. Networking Devices with WiFi . . . . . . . . 139
6.1 Working with WiFi on Android Devices 140
6.2 Working with Networking Classes 141
6.3 Using the Open Sound Control Networking Format 143
6.4 Network an Android with a Desktop PC 144
6.5 Share Real Time Data 153
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6.6 Network a Pair of Androids for a Multiplayer Game 158
6.7 Wrapping Up 164
7. Peer-To-Peer Networking Using Bluetooth and WiFi Direct . 165
7.1 Introducing Short-Range Networking and UI Classes 166
7.2 Working with the KetaiBluetooth Class 167
7.3 Introducing Bluetooth 168
7.4 Working with the Android Activity Lifecycle 168
7.5 Connect Two Android Devices Via Bluetooth 170
7.6 Create A Survey App Using Bluetooth 181
7.7 Working with WiFi Direct 197
7.8 Use WiFi Direct To Control Remote Cursors 198
7.9 Wrapping Up 204
8. Using Near Field Communication (NFC) . . . . . . 205
8.1 Introducing NFC 206
8.2 Working with the KetaiNFC Class and NDEF Messages 209
8.3 Share a Camera Preview Using NFC and Bluetooth 210
8.4 Read a URL from an NFC Tag 220
8.5 Write a URL to an NFC Tag 225
8.6 Wrapping Up 228
Part IV — Working with Data
9. Working With Data . . . . . . . . . . . 233
9.1 Introducing Databases 234
9.2 Working with the Table Class and the File System 235
9.3 Working with the Android Storage 236
9.4 Read A Tab-separated Grocery List 237
9.5 Read Comma-separated Web Color Data 241
9.6 Save User Data in a TSV File 245
9.7 Write Data to the External Storage 250
9.8 Visualize Real-Time Earthquake Data 252
9.9 Add Vibes to the Earthquake App 260
9.10 Wrapping Up 265
10. Using SQLiteDatabases . . . . . . . . . . 267
10.1 Working with SQLite Databases 268
10.2 Working With the KetaiSQLite Class 268
10.3 Implement A Data Table in SQLite 269
10.4 Record Sensor Data Into a SQLite Database 274
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10.5 Refine SQLite Results using WHERE Clauses 280
10.6 Wrapping Up 284
Part V — Creating 3D Graphics and Cross-platform Apps
11. Introducing 3D Graphics With OpenGL . . . . . . 287
11.1 Introducing 3D Graphics and OpenGL 288
11.2 Work With 3D Primitives And Lights 289
11.3 Apply An Image Texture 293
11.4 Use the Camera Preview as 3D Texture 295
11.5 Work With Spot And Point Lights 297
11.6 Use Custom Fonts and Large Amounts of Text 301
11.7 Wrapping Up 309
12. Working With Shapes and 3D Objects . . . . . . 311
12.1 Working With the PShape Class 312
12.2 Working with SVG Graphics and Maps 313
12.3 Map the United States 314
12.4 Display an Architectural Model Loaded From an Object
File 319
12.5 Create a Moebius Shape And Control It Using the
Gyroscope 323
12.6 Use GPU Memory to Improve Frame Rate 330
12.7 Control a Virtual Camera With Your Gaze 332
12.8 Wrapping Up 337
13. Sharing and Publishing Applications . . . . . . 339
13.1 Sharing Your Code 339
13.2 Export a Project to Eclipse 340
13.3 Branding Your App 341
13.4 Moving Your App to Eclipse for Further Development 342
13.5 Publishing Your App to Google Play 346
13.6 Packaging Your App to Run in HTML5-Ready Browsers 354
13.7 Wrapping Up 363
A1. Appendix . . . . . . . . . . . . . 365
A1.1 Android Version History 365
A1.2 Introducing Ketai Library Classes 365
A1.3 Find Vendors 367
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A1.4 Writing to a Text File on a Web Server 367
A1.5 Troubleshooting 370
Bibliography . . . . . . . . . . . . 375
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Change History
The book you’re reading is in beta. This means that we update it frequently.
This chapter lists the major changes that have been made at each beta release
of the book, with the most recent change first.
Beta 4.0 November 12, 2012
• We’ve added the last chapter, Chapter 13, "Sharing and Publishing
Applications"
• We’ve tested and updated the code examples to work with the latest version
of Processing: Version 2, Beta 6. This has allowed us, for example, to
remove calls to onPause() and onResume()
• In Chapter 1, "Getting Started," we’ve added links to instructions for
Windows and Linux on how to install a USB driver and set up an Android
device to use it
• We’ve changed references to the "Standard" mode to "Java" mode to match
the change on terminology in the Processing 2
• We’ve added links to the chapter by chapter overview in the "Preface" so
ebook readers can to jump directly to a chapter from its description
• We’ve added support to the Ketai Library Version 8 for loading an existing
SQLite database and included a code snippet that shows how to use the
feature in Chapter 10, "Using SQLiteDatabases".
• In the "WiFiDirectCursors" example, we’ve replaced the connectToDevice(selec-
tion) method with the connect() method to reflect changes to the Ketai library
• We’ve changed the Android SDK Manager screenshot in "Appendix" to
reflect changes in what’s required to use the Android SDK that have
occurred since the release of Processing 2
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