Andriond Interview Question -1

Brief about the Android?
Andriod is a Operating System for device
It was initially developed by Android Inc., a firm later purchased by Google, and lately by the Open Handset Alliance.
It allows developers to write managed code in the Java language, controlling the device via Google-developed Java libraries.

Architecture of Android :
1. Linux Kernal [ 2.6 Kernal - security, memory management, process management, network stack, and driver model]
2. Native Libraries [SQLite, WEBKit, OpenGL,..]
3. Runtime + Dalvik VM [.dex format, Lightweight VM, Efficient Dalvik Bytecode]
4. Application Framework [Activity Manager, Content Manager, Location Manager, ]
5. Application [ System Apps and Your Apps]

Refer : http://about-android.blogspot.com/2009/11/architecture-of-android-1.html


What are the basic Components in Android?
Activities - An activity presents a visual user interface for one focused endeavor the user can undertake.
Services - A service doesn't have a visual user interface, but rather runs in the background for an indefinite period of time.
Broadcast receivers - A broadcast receiver is a component that does nothing but receive and react to broadcast announcements.
Content providers - A content provider makes a specific set of the application's data available to other applications.

http://about-android.blogspot.com/2009/11/application-fundamentals.html



what are the versions are avilable in android?
Version : 1.5 - Cupecake
Linux Version : 2.6.27
Offical release On : April 30th 2009
Main Feature :
* Ability to record and watch videos with the camcorder mode
* Uploading videos to YouTube and pictures to Picasa directly from the phone
* A new soft keyboard with an "Autocomplete" feature
* Bluetooth A2DP support and ability to automatically connect to a Bluetooth headset within a certain distance
* New widgets and folders that can populate the Home screens
* Animations between screens
* Expanded ability of Copy and paste to include web pages

Version : 1.6 - Donut
Linux Version : 2.6.29
Offical release On : April 30th 2009
Main Features :
* An improved Android Market experience.
* An integrated camera, camcorder, and gallery interface.
* Gallery now enables users to select multiple photos for deletion.
* Updated Voice Search, with faster response and deeper integration with native applications, including the ability to dial contacts.
* Updated search experience to allow searching bookmarks, history, contacts, and the web from the home screen.
* Updated Technology support for CDMA/EVDO, 802.1x, VPN, Gestures, and a Text-to-speech engine.
* Support for WVGA resolutions.
* Speed improvements for searching & the camera.[35]

Version : 2.0 & 2.1- Eclair
Linux Version : 2.6.29
Offical release On : October 26th 2009
Main Features :
* Optimized hardware speed
* Support for more screen sizes and resolutions
* Revamped UI
* New browser UI and HTML5 support
* New contact lists
* Better white/black ratio for backgrounds
* Improved Google Maps 3.1.2
* Microsoft Exchange support
* Built in flash support for Camera
* Digital Zoom
* MotionEvent class enhanced to track multi-touch events[41]
* Improved virtual keyboard
* Bluetooth 2.1
* Live Wallpapers

what is the folder structure of android?
1. src - It contain the java code
2. Resource - It contain the all resource with different floder
drawable - Icon
raw - Sounds
menu - Menu
values - Project Properties
layout - User interface Screens
3. gen - It contains the R.java file. You could not edit R.java manually. This have been generated automatically by understanding resource files etc.
4. AndroidManifest -It contains the Project properties
5. Android lib.

Refer :
http://about-android.blogspot.com/2009/11/application-fundamentals.html

what are the api available in the Android?
Activity Manager, WindowManager, Location Manager, View System, Notification Manager, Telephonic Manager, Package Manager,
Resource Manager,