2. What is Android?
2
• 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.
• Android offers a unified approach to application
development for mobile devices which means developers
need only develop for Android, and their applications
should be able to run on different devices powered by
Android.
5. What is A Features of Android?
5
Feature Description
Beautiful UI
Android OS basic screen provides a beautiful and
intuitive user interface.
Connectivity
GSM/EDGE, IDEN, CDMA, EV-DO, UMTS, Bluetooth,
Wi-Fi, LTE, NFC and WiMAX.
Storage
SQLite, a lightweight relational database, is used for
data storage purposes.
Media support
H.263, H.264, MPEG-4 SP, AMR, AMR-WB, AAC, HE-
AAC, AAC 5.1, MP3, MIDI, Ogg Vorbis, WAV, JPEG,
PNG, GIF, and BMP
Messaging SMS and MMS
Wi-Fi Direct
A technology that lets apps discover and pair directly,
over a high-bandwidth peer-to-peer connection.
Android Beam
A popular NFC-based technology that lets users
instantly share, just by touching two NFC-enabled
phones together.
6. Features of Android Con
6
Web browser
Based on the open-source WebKit layout engine,
coupled with Chrome's V8 JavaScript engine
supporting HTML5 and CSS3.
Multi-touch
Android has native support for multi-touch which
was initially made available in handsets such as
the HTC Hero.
Multi-tasking User can jump from one task to another and same
time various application can run simultaneously.
Resizable widgets Widgets are resizable, so users can expand them to
show more content or shrink them to save space
Multi-Language Supports single direction and bi-directional text.
GCM
Google Cloud Messaging (GCM) is a service that
lets developers send short message data to their
users on Android devices, without needing a
proprietary sync solution.
7. Android Applications
7
• Once developed, Android applications can be packaged
easily and sold out either through a store such as Google
Play, SlideME, Opera Mobile Store, Mobango,F-
droid and the Amazon Appstore.
9. What is API level?
9
• API Level is an integer value that uniquely identifies the
framework API revision offered by a version of the
Android platform. The Android platform provides a
framework API that applications can use to interact with
the underlying Android system. The framework API
consists of: A core set of packages and classes.
developer.android.com/guide/topics/manifest/uses-sdk-element.html
10. Features of Android
10
Code name Version number Initial release date API level
1.0 September 23, 2008 1
1.1 February 9, 2009 2
Cupcake 1.5 April 27, 2009 3
Donut 1.6 September 15, 2009 4
Eclair 2.0–2.1 October 26, 2009 5–7
Froyo 2.2–2.2.3 May 20, 2010 8
Gingerbread 2.3–2.3.7 December 6, 2010 9–10
Honeycomb[a] 3.0–3.2.6 February 22, 2011 11–13
Ice Cream Sandwich 4.0–4.0.4 October 18, 2011 14–15
Jelly Bean 4.1–4.3.1 July 9, 2012 16–18
KitKat
4.4–4.4.4, 4.4W–
4.4W.2
October 31, 2013 19–20
Lollipop 5.0–5.1.1 November 12, 2014 21–22
Marshmallow 6.0–6.0.1 October 5, 2015 23
N Developer Preview 1
11. Global Android version distribution since
December 2009. As of February 2016
11
By Erikrespo - Android Developer Dashboard
], Android 4.4 "KitKat" is the single most widely used Android version,
operating on 35.5% of all Android devices accessing Google Play. The second
are different Android "Lollipop" versions (5.0–5.1.1), with a combined share
of 34.1%.[1]
15. Android Emulator
15
• Android Emulator is used to
run, debug and test the android
application. If you don't have the
real device, it can be the best way
to run, debug and test the
application.
• It uses an open source processor
emulator technology called
QEMU.
16. Application Components
16
• Application components are the essential building
blocks of an Android application. These
components are loosely coupled by the application
manifest file AndroidManifest.xml that describes
each component of the application and how they
interact.
17. What are the main
components of Android?
Components Description
Activities
They dictate the UI and handle the user
interaction to the smart phone screen
Services
They handle background processing
associated with an application.
Broadcast Receivers
They handle communication between
Android OS and applications.
Content Providers
They handle data and database
management issues.
17
http://www.tutorialspoint.com/android/android_application_components.htm
18. Additional Components
18
There are additional components which will be used in
the construction of above mentioned entities, their
logic, and wiring between them. These components are
−
The Dex compiler converts the class files into the .dex file that run on the Dalvik VM. Multiple class files are converted into one dex file
The javac tool compiles the java source file into the class file.
The dx tool takes all the class files of your application and generates a single .dex file. It is a platform-specific tool.
The Android Assets Packaging Tool (aapt) handles the packaging process.
