Exploring Ketai Library, Droidcon

1. Exploring the Ketai library for faster
development of Android Features
Sriram Narasimhan
ThoughtWorks

2. Agenda
• Introduction to Processing
• 2D programming using Processing
• OOP using Processing
• Ketai library
• KetaiGesture
• KetaiLocation
• KetaiCamera
• Wifi networking

3. Processing
• Open source programming language &
environment
• http://www.processing.org/reference/
• Create images, animations, interactions
• Installation
• IDE Modes – android, java (standard)
, JavaScript

4. 2D Programming in Processing
• text, println, image
• Background, Stroke
• ellipse(50, 50, 80, 60);
• Mouse location, actions & more 2D

5. OOP Using Processing
• Multiple files in a project
• Classes & Objects
• Processing keywords in classes and methods
• Demo on Processing

6. Ketai Library
• OpenSource by ‘Daniel Sauter’
• ‘Cell phone culture’ in Japanese
• Installed through Processing IDE
• Hardware devices and sensors built into Android
• Supports easy development for
• Cameras, Sensors, Location
• Multi-touch gestures,
• Peer-to-peer n/w via Bluetooth and WiFi Direct, NFC
• SQLite for local databases.

7. KetaiGesture
• KetaiGesture class
• Callbacks
• tap,
• Double Tap
• Long press
• Flick
• Pinch
• surfaceTouchEvent
• Demo

8. KetaiLocation
• KetaiLocation class
• Processing permissions
• Basic location attributes
• Distance between 2 locations
• Demo

9. KetaiCamera
• KetaiCamera class
• Capturing using camera
• Storing to device
• KetaiFaceDetector
• Demo

10. Networking devices via Wifi
• oscP5 data protocol
• Connecting mouse on laptop & accelerometer on
android device
• KetaiOSCMessage
• Demo

11. References
• http://processing.org/learning/
• http://wiki.processing.org/w/Android
• http://code.google.com/p/ketai/
• http://pragprog.com/book/dsproc/rapid-android-development

12. Thanks
Next Steps For Me …
• Apps on PlayStore using Processing & Ketai
• Contribute to Ketai