Android ADT-Bundle Installation on Windows and Ubuntu : In 2 Steps.

1. Get the Android SDK

The Android SDK provides you the API libraries and developer tools necessary to build, test, and debug apps for Android.
With a single download, the ADT Bundle includes everything you need to begin developing apps:

• Eclipse + ADT plugin
• Android SDK Tools
• Android Platform-tools
• The latest Android platform
• The latest Android system image for the emulator

SYSTEM REQUIREMENTS

Operating Systems
Windows XP (32-bit), Vista (32- or 64-bit), or Windows 7 (32- or 64-bit)
Mac OS X 10.5.8 or later (x86 only)
Linux (tested on Ubuntu Linux, Lucid Lynx)
GNU C Library (glibc) 2.7 or later is required.
On Ubuntu Linux, version 8.04 or later is required.
64-bit distributions must be capable of running 32-bit applications.

Download Here:

http://developer.android.com/sdk/index.html

• Windows 32-bit:                adt-bundle-windows-x86-20130729.zip         465 Mb
• Windows 64-bit:                adt-bundle-windows-x86_64-20130729.zip   465 Mb
• Mac OS X 64-bit:              adt-bundle-mac-x86_64-20130729.zip          430 Mb
• Linux 32-bit(Ubuntu):       adt-bundle-linux-x86-20130729.zip              459 Mb
• Linux 64-bit(Ubuntu):       adt-bundle-linux-x86_64-20130729.zip         460 Mb

2.Install the SDK and Eclipse IDE

Windows Users:
1. Unpack the ZIP file (named adt-bundle-<os_platform>.zip) and save it to an appropriate location, such as a "Development" directory in your home directory.
2. Open the adt-bundle-<os_platform>/eclipse/ directory and launch eclipse.
3. That's it! The IDE is already loaded with the Android Developer Tools plugin and the SDK is ready to go.

Ubuntu Users:
1. Unpack the ZIP file (named adt-bundle-<os_platform>.zip) and save it to 'Home'(Places-> Home Folder) location
2. Simply right click the eclipse(adt-bundle-linux-x86 -> eclipse -> eclipse) and choose "properties", then go to the "Permission" tab and check "Allow executing file as program".
3. That's it! The IDE is already loaded with the Android Developer Tools plugin and the SDK is ready to go.

Android installation

Build Your First App Now !

Beginners please use the reference link below.

http://developer.android.com/training/basics/firstapp/index.html

Please feel free to ask doubts and share your experience with android here !

Lets develop together, cheers !