An introduction to the Android mobile operating system and programming framework. Example code at http://resume.jesse-anderson.com/introduction_to_android.zip.

1. Jesse Anderson

2.  Operating System for Mobile Devices
 Based on modified Linux kernel
 Middleware
 Set of Applications
 E-mail client
 Browser
 Released under Apache License

4.  Dalvik Virtual Machine
 Webkit for Browser and Embeddable Object
 2D and 3D (Open GL) graphics
 SQLite for databases
 Still Image Support (JPEG, GIF, PNG, BMP)
 Video Support (H.263, H.264 AVC, MPEG-4
SP)
 Audio Support (AAC, MP3, MIDI, Ogg Vorbis,
PCM)

5.  Bluetooth
 EDGE and 3G
 WIFI (802.11 b/g/n)
 WiMAX
 Camera
 GPS
 Compass
 Accelerometer

6.  Optimized for low memory
 Register Based not Stack Based
 Multiple VM instances at once
 Compiled into dex files and apk package
 JIT Compilation added in Android 2.2
 No Java ME, AWT or Swing classes

7. Android iPhone SDK
Programming
Languages
Java, C, C++, App
Inventor, Mono,
Interpreted
Objective C
App Market Wild West Gilded Cage
App Submission Immediate Reviewed (HIG, legal)
Device Makers Many Apple
SDK Free/OSS ($25 listing) $100
Development Platforms Windows, Mac, Linux Mac OSX
Distribution Restrictions None Provisioned
Market Share 13% 24.4%
UI Framework Android Cocoa Touch

8.  Application Package apk
 Contains all data and resources needed
 Components
 Activity
 Visual user interface for one focused endeavor
 Service
 Background task like music playback
 Broadcast Receivers
 Receive and react to broadcast announcements
 Content Providers
 Makes data available to other applications

9.  Activates Activities, Services, or Broadcast
Receivers
 Move between Activities in program
 Initiate a phone call
 Send an E-mail
 Get broadcasts when battery is low

11.  Programmatically
 Using POJO (Plain Old Java Objects)
 Using XML (Preferred)
 Layouts
 Menus
 Values
 Resource Arrays
 Colors
 Dimensions
 Strings
 Styles

12.  Download and install Eclipse
 Download and install Android SDK
 Download Android Platforms and
Components
 Install ADT plug-in for Eclipse
 http://developer.android.com/sdk/eclipse-adt.html

13.  Hello World as a POJO example

14.  R Class
 Provides constants for accessing resources in
strings.xml, colors.xml, layouts, etc
 Generated code
 Automatically handled on Eclipse using Android plug-
in
 Manually using Android tools

15.  UI Object from Layout
 Provide Resource ID
 android:id="@+id/uiObject“
 (cast) findViewById(R.id.uiObject);
 Strings
 @string/myString
 getString(R.string.myString);
 Colors (ARGB)
 @color/myColor
 getResources().getColor(R.color.myColor);

16.  Hello World Using XML
 Hello World Using XML and Resources

17.  Activities show a user interface
 New activities must be registered in the
AndroidManifest.xml file
 Intents move between activities

18.  Hello World Using Intents and new Activities

19.  Android Developer Documentation
 http://developer.android.com
 Hello Android by Ed Burnette
 Beginning Android by Mark L. Murphy
 Google I/O Videos
 http://developer.android.com/videos
 http://code.google.com/events/io/2010/sessions.html