Getting Started with Android OSSPAC conference Singapore February 17 2009

1. Getting Started with Android
Sean Sullivan
OSSPAC
17 February 2009

2. 05 February 2009
Singapore Telecommunications Limited (SingTel)
and HTC Corporation, a global leader in mobile
phone innovation and design, today unveiled the
first Android™ powered mobile phone released in
Asia - the HTC Dream™

6. What is Android?
Android is a software stack for mobile devices
that includes an operating system, middleware
and key applications
source: Google

7. August 2005
Google acquires Android
November 2007
Open Handset Alliance announcement
Android SDK available

8. Open Handset Alliance

9. September 2008
HTC and T-Mobile announce G1
October 2008
Android SDK 1.0
Android Market goes live
G1 available in retail stores in USA

10. Technical specs
• Qualcomm MSM7201A, 528 MHz
• ROM 256 MB
• RAM 192 MB
• 4.60 in x 2.16 in x 0.62 in
• 158 grams
• Lithium Ion battery,1150 mAh
• WiFi 802.11 b/g

11. Technical specs
• 3G (HSDPA)
• quad band GSM
• touch screen, HVGA 320x480
• QWERTY keyboard
• 3.2 megapixel camera
• microSD expansion slot
• GPS, compass, accelerometer

12. Third party applications
lifeaware.net Maverick Android Locale

13. Android applications
• multiple applications, running simultaneously
• user may switch between running applications
• background services
• copy and paste

14. Distributing Android apps
• Android Market
• self-publish on your own web site
• use a 3rd party application store

15. Android Market

16. Android Market
• US$25 registration fee for developers
• developer receives 70% of each sale
• remaining amount goes to carriers
• Google does not take a percentage
• http://www.android.com/market/

17. Self-publishing
• upload application to your own web server
http://icecondor.com/download/icecondor-v20090201.apk
• use correct MIME type
application/vnd.android.package-archive

18. System Architecture

19. Open source project
• http://source.android.com
• Apache 2.0 and GPL v2
• Git repository

20. Android applications
• are written in the Java language
• run on the Dalvik virtual machine
• Android != J2ME

21. Dalvik VM
• not a Java VM
• design constraints: slow CPU, little RAM
• will run on OS without swap space
• http://sites.google.com/site/io/dalvik-vm-internals

22. Application API’s
java.util.*
java.io.*
Java
java.lang.*
etc
android.widget.*
UI android.view.*
android.graphics.*
Telephony android.telephony.*
SMS android.telephony.gsm.SmsManager

23. Application API’s
Web android.webkit.WebView
Camera android.hardware.CameraDevice
Local database android.database.*
Maps com.google.android.maps.MapView
Location android.location.LocationManager
Multimedia android.media.MediaPlayer
HTTP org.apache.http.client.*

24. Getting started
http://developer.android.com

25. Development tools
• Java SDK
• Android SDK
• Eclipse
• Eclipse plugin

26. Android SDK
• Android emulator
• command line tools
• documentation
• example applications

27. Command line tools
• aapt - Android asset packaging tool
• adb - Android debug bridge
• aidl - Android IDL compiler
• emulator - Android emulator

28. Android emulator

29. Eclipse plugin
https://dl-ssl.google.com/android/eclipse/

30. Android applications
• application package file: myapp.apk
• an application is composed of one or more
activities

31. Activity
• an activity is usually a single screen in your
application
• however, activities can also be faceless
• one activity is designated as the entry point
for your application

32. android.app.Activity
import android.app.Activity;
public class MyActivity extends Activity
{
public void onCreate(Bundle savedValues)
{
super.onCreate(savedValues);
setContentView(R.layout.main);
}
}

33. Application
building blocks
• •
AndroidManifest.xml Intents &
IntentReceivers
• Activities
• Services
• Views
• Notifications
• Layouts
• ContentProviders

34. Manifest file
<?xml version=quot;1.0quot; encoding=quot;utf-8quot;?>
<manifest xmlns:android=quot;http://schemas.android.com/apk/res/androidquot;
package=quot;com.my_domain.app.helloactivityquot;>
<application android:label=quot;@string/app_namequot;>
<activity android:name=quot;.HelloActivityquot;>
<intent-filter>
<action android:name=quot;android.intent.action.MAINquot;/>
<category android:name=quot;android.intent.category.LAUNCHERquot;/>
</intent-filter>
</activity>
</application>
</manifest>
AndroidManifest.xml

35. UI development
• XML
• Java code

36. Android UI XML
<?xml version=quot;1.0quot; encoding=quot;utf-8quot;?>
<LinearLayout xmlns:android=quot;http://schemas.android.com/apk/res/androidquot;
android:orientation=quot;verticalquot;
android:layout_width=quot;fill_parentquot;
android:layout_height=quot;fill_parentquot;
>
<TextView
android:layout_width=quot;fill_parentquot;
android:layout_height=quot;wrap_contentquot;
android:text=quot;Hello Worldquot;
/>
</LinearLayout>

37. Android Views
a view is an object that knows how to draw
itself on the screen

38. ListView

39. DatePicker

40. MapView

41. Additional topics
• •
Threading Android IDL (AIDL)
• •
Security model Data synchronization
• •
Internationalization WiFi API
• •
Power management Bluetooth API

42. What’s next for Android?
• more phones
• virtual keyboard
• Bluetooth A2DP
• multi-touch?

43. Questions?

44. Thank you

45. Android resources
• http://developer.android.com
• http://android-developers.blogspot.com
• http://code.google.com/p/apps-for-android/
• http://sites.google.com/site/io/
• http://www.openhandsetalliance.com
• http://source.android.com