Basic of Android-1

1. What is meaning of Android Word?
it means a robot with a human appearance.

2. What is Android?
an open-source operating system used for smartphones and tablet computers.

3. Inventors of android ?
Andy Rubin, Rich Miner, Nick Sears

4. Android versions history and there name?

Code name	Version	API level
Lollipop	5.0	API level 21
KitKat	4.4 - 4.4.4	API level 19
Jelly Bean	4.3.x	API level 18
Jelly Bean	4.2.x	API level 17
Jelly Bean	4.1.x	API level 16
Ice Cream Sandwich	4.0.3 - 4.0.4	API level 15, NDK 8
Ice Cream Sandwich	4.0.1 - 4.0.2	API level 14, NDK 7
Honeycomb	3.2.x	API level 13
Honeycomb	3.1	API level 12, NDK 6
Honeycomb	3.0	API level 11
Gingerbread	2.3.3 - 2.3.7	API level 10
Gingerbread	2.3 - 2.3.2	API level 9, NDK 5
Froyo	2.2.x	API level 8, NDK 4
Eclair	2.1	API level 7, NDK 3
Eclair	2.0.1	API level 6
Eclair	2.0	API level 5
Donut	1.6	API level 4, NDK 2
Cupcake	1.5	API level 3, NDK 1
(no code name)	1.1	API level 2
(no code name)	1.0	API level 1

5. Features of Android OS?
Most of us are aware of features like 
Live wallpaper
Camera
Messaging
Bluetooth
WIFI
Web Browsing
Music
Alarm etc. etc….

6. Advance Features of Android OS?
Google now (voice assistant)
NFC (Near Field Communication)
Unlock your phone by your face
Use your phone with joystick to enjoy gaming experience
Connect your phone with LED TV via MHL or micro HDMI cable
Screen Capture
Multitasking Future (Task Switcher)
Data Usages (Check and also set limit from device)

7. Tools Required for Developing Android Apps?  
JDK

Eclipse + ADT plugin

SDK Tools.

You can also use Android Studio by Google.

8. ADT stand for?
Android Developer Tools

9. SDK stand for ?
Software Development Kit

10. Advantages of android?
Open-source
Platform-independent
Supports various technologies (having number of native application like: camera, bluetooth, wifi, speech, EDGE)

11. Language Know to develop android apps?
Java
XML

12. Android application main components are?

Ad Options

Components	Description
Activities	They dictate the UI and handle the user interaction to the smartphone 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.

13. What is Activities?
An activity is a single, focused thing that the user can do. when ever user click on GUI the next Activity will be start and new GUI set base on coding.

14. What is Intent?
An Intent is exactly what it describes. It's an "intention" to do an action.

An Intent is basically a message to say you did or want something to happen. Depending on the intent, apps or the OS might be listening for it and will react accordingly.

There are two types of intents in android:

• Implicit Intent
• Explicit Intent

15. How to Start Another Activity?
Intent i = new Intent(getApplicationContext(), Activity2.class); 
startActivity(i);

16. Explain Folder, File & Description of Android Apps?
src: This contains the .java source files for your project.

gen: contains the .R file, a compiler-generated file that references all the resources found in your project. You should not modify this file.

bin: contains the Android package files .apk built by the ADT during the build process and everything else needed to run an Android application.

res/drawable-hdpi
This is a directory for drawable objects that are designed for high-density screens.

res/layout
This is a directory for files that define your app's user interface.

res/values
This is a directory for other various XML files that contain a collection of resources, such as strings and colors definitions.

AndroidManifest.xml
This is the manifest file which describes the fundamental characteristics of the app and defines each of its components.

17. What is AVD?
AVD Stand for Android Virtual Device (emulator), The Android SDK includes a mobile device emulator - a virtual mobile device that runs on your computer