Android is an open source and Linux-based operating system for mobile devices such as smartphones and tablet computers. Android was developed by the Open Handset Alliance, led by Google, and other companies. This tutorial will teach you basic Android programming and will also take you through some advance concepts related to Android application development.

1. Agenda
● Introduction
● Android Components overview
● Sample Application
● Android Software Stack
● Android Components detailed
– Activity, Service, Provider, Receiver

2. History of Android
• Android, Inc. – 2003
• Operating system for digital cameras
• Google Acquisition – 2005
• Open Handset Alliance – Nov 2007
– Google, HTC, Sony and Samsung
– Qualcomm and Texas Instruments
• HTC Dream - October 22, 2008

3. Android Application Components

4. Application Components
• Application components are the essential
building blocks of an Android
application.

5. Application components
● Activity
● Service
● Broadcast Receiver
● Content Provider

6. Application components

7. Activities
• An activity represents a single screen
with a user interface
• Example of Activities in Email app
– Email List
– Compose
– Read

8. Activities

9. Services
• A service is a component that runs in the
background
• A service does not provide a user
interface.
• Example : Music Player, Downloader

10. Services

11. Content Provider
• Content provider
– Allows to share data with other apps
•

12. Content Provider

13. Content Provider

14. Broadcast Receiver
●
Listener of System wide events.
●
Examples
– SMS received , Wifi / Bluetooth connected
– Battery Low, Device Rebooted
●
No UI
●
Lightweight ( < 10 seconds )

15. Intents
IntentsIntents
Intents are messages across components.
Like Hyperlinks on
the web

16. Intents
● Support interaction between components
– e.g. Start a new Activity
– Broadcast messages
● Intents : request for action to be performed

17. 17
Types of Intents
MyApp
Activity1 Service1Intent ( myService.class )
OtherAppMyApp
Activity1 Activity2
Explicit Intent
Implicit IntentIntent ( “ACTION” )
Intents

18. Intents
start new Activity
● Dial a number
Intent intent = new Intent(Intent.ACTION_DIAL,
Uri.parse(“tel:97412345”));
● Launch a website
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse(“http://www.google.com”));

19. Intents
start new Activity
● Launch another activity
Intent i = new Intent(this, SecondActivity.class)
startActivity(i)

20. Intent Filter
● Registers components as capable of receiving
Intents
● Matches intents to the component (Activity ,
Service, Receivers)
● Declared mostly in AndroidManifest.xml

21. Functional Android App

22. <?xml version="1.0" encoding="utf-8"?>
<manifest>
<uses-permission />
<uses-sdk />
<application>
<activity>
</activity>
</application>
</manifest>
Application Manifest File

23. <?xml version="1.0" encoding="utf-8"?>
<LinearLayout>
<TextView android:text="I am a TextView" />
<Button android:text="I am a Button" />
</LinearLayout>
XML Snippet

24. Preview

25. Layouts
• Linear Layout
• Relative Layout
• List View
• Grid View

26. Linear Layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:orientation="vertical" >
<TextView android:text="I am a TextView" />
<Button android:text="I am a Button" />
</LinearLayout>

27. Linear Layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:orientation=“horizontal" >
<TextView android:text="I am a TextView" />
<Button android:text="I am a Button" />
</LinearLayout>

28. Layouts
Grid ViewList View

29. UI Widgets

30. Sample App
<Button android:id="@+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=“I am a Button"/>
Button myButton =(Button)findViewById(R.id.my_button);

31. Sample App
public void (View v)
{
// action
}
Add this in XML file
android:onClick="myMethod"

32. Sample App
● Extend this to create SecondActivity
● invoked on clicking the button

33. Inside the APK
● Compiled Java source
● Libraries
● XML files for UI, strings
● Resources – Images etc
● Android Manifest

34. Android Software Stack
● Kernel
● Libraries / Runtime
● Application Framework
● Applications

35. Android Software Stack

36. Linux kernel
• Android built on Linux 2.6 kernel
• Provides security, memory management,
process management, network stack,
and driver model
• Abstraction layer between hardware and
the software stack

37. Libraries
• A set of C/C++ libraries exposed to
developers through the application
framework

38. Application Framework

39. Application Framework

40. Applications

41. Summary
● Android Components
● Android Sample Program
● Activity, Services, Broadcast Receiver
● Intents
● Android Stack

42. Contact
arvindd@belimitless.co
http://belimitless.co