This document provides an overview of the Android platform, including key features such as being an open source platform, supporting multiple screen sizes and resolutions, concurrent applications, inter-app communication, hardware sensors, and the Native Development Kit for C/C++ code. It also discusses publishing apps, the developer community, and monetization options.

1. 10101010101
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Overview
Google confidential and proprietary
Android Developer Labs ­ Q1 2010 1

2. Android
• Android is an open platform, and it’s
open source
• Free, no licensing required
• Develop in Java, C/C++
• Replace the core apps with your own
• Source code available
– SDK and core apps
– http://source.android.com
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3. Key Platform Features
• Multiple Screen Sizes
• User Interface
• Concurrent Applications
• Inter­app Communication
• Speech Input
• Location and Mapping Services
• Hardware Sensors
• Native Development Kit
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4. Multiple Devices, Single App
• Shipping 60K devices per day
• More devices = more business
• SDK supports:
– Many screen sizes/resolutions
– Screen density independence
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5. Multiple Devices, Single App
~120 / ldpi ~160 / mdpi ~240 / hdpi
Small screen
~ ≤ 3.0”
Normal screen
~ ≤ 4.0”
Large screen
~ ≥ 4.8”
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6. Surfacing Your UI
• Launcher icons
• Notification bar
• Widgets
• Quick Search Box
integration
• Live Folders
• Live Wallpapers
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7. Surfacing Your UI
• Launcher icons
• Status Bar Notification
• Widgets
• Quick Search Box
• Live Folders
• Live Wallpapers
Android Developer Labs ­ Q1 2010 7

8. Surfacing Your UI
• Launcher icons
• Status Bar Notification
• Widgets
• Quick Search Box
• Live Folders
• Live Wallpapers
Android Developer Labs ­ Q1 2010 8

9. Surfacing Your UI
• Launcher icons
• Status Bar Notification
• Widgets
• Quick Search Box
• Live Folders
• Live Wallpapers
Android Developer Labs ­ Q1 2010 9

10. Surfacing Your UI
• Launcher icons
• Status Bar Notification
• Widgets
• Quick Search Box
• Live Folders
• Live Wallpapers
Android Developer Labs ­ Q1 2010 10

11. Surfacing Your UI
• Launcher icons
• Status Bar Notification
• Widgets
• Quick Search Box
• Live Folders
• Live Wallpapers
Android Developer Labs ­ Q1 2010 11

12. Concurrent Applications
• Users can multitask
– Apps get paused, not closed
• Background services
– Invisible apps with no GUI
– Unobtrusive event notifications
– Listen to music and check email
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13. Inter­App Communication
• Intents allow apps to invoke other apps
• Apps fire Intents with params
• Apps listen for Intents and handle accordingly
Application Application
A B
“Intent”
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14. Example: Inter­App Communication
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15. Speech Input
• Enables voice­to­text capability
• Invoke via IME or Intent
• English, Mandarin Chinese & Japanese
• Integrate with 3rd party speech recognition
service
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16. Example: Speech Input
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17. Location and Mapping
• LocationManager
– Service determines location and bearing
– Register for periodic updates by time
– Register for proximity updates by distance
• Google Maps library
– Includes MapView
– Programmatic access to Google Maps API
– Handles user interaction to control Map
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18. Example: Location and Mapping
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19. Hardware Sensors
• Camera
• Microphone
• Accelerometer
• Compass
• Example apps:
Layar, Google Goggles
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20. Native Development Kit (NDK)
• Used in conjunction with the SDK
• Performance­critical, C/C++ code
• Just launched NDK r3
– Support for OpenGL ES 2.0
– Compact, efficient binaries
• Typical uses:
– Games
– Re­use existing C/C++ code base
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21. Getting Started
developer.android.com
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22. Publishing
• Simple approach to publishing apps
– Upload to Android Market, live in few minutes
– No proactive review process
• Updates
– Same process, just push the button
• Reporting
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23. Developer Community
• Android has a strong, active developer base
– Google Groups
– Stack Overflow
– IRC office hours
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24. 10101010101
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Q&A
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Android Developer Labs ­ Q1 2010 24

25. 10101010101
Appendix
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26. AdSense for Mobile Applications SDK
• Monetize!
• Auto display highest paying ads
• Targeting
– Keyword, demographics, location
– Ad placement
• Control ad appearance and positioning
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27. Analytics Tracking for Mobile Apps
• Tracks install referrer
• Tracks Pageviews & Events
• Integrates with Google Analytics dashboard
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28. Device Dashboard
Android Platform % of Devices
Android 1.1 0.3%
Android 1.5 31.0%
Android 1.6 47.6%
Android 2.0 0.7%
Android 2.0.1 20.4%
Note: This data is based on the number of Android devices that have accessed
Android Market within a 14­day period ending on 1/4/2010
http://developer.android.com/resources/dashboard/platform­versions.html
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29. Source Code Contribution
http://source.android.com/submit­patches/workflow
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