Installing Android in Eclipse

What you'll need:
Eclipse (I use Helios Indigo 3.7.2)
Where: www.eclipse.org/downloads/ 
How: http://eclipsetutorial.sourceforge.net/totalbeginner.html

Android SDK
Where:http://developer.android.com/sdk/index.html

There are two components in order to develop applications in Android. First, the SDK then the ADT.

1. Go to http://developer.android.com/sdk/index.html and download the SDK that fits your system. 

2. Download the ADT Plugin
Go to help > install new software > add
A dialog will appear

Name: ADT Plugin
Location: https://dl-ssl.google.com/android/eclipse/

3. If there are troubles with the location URL, try using http instead of https.
4. Click OK and wait.
5. You will then see a new screen with a list of tools to be downloaded. 
6. Select the checkbox for Developer Tools and click Next.
7. The read and accept license will then show up,read accept it then click finish.
8. Installation is now complete and you may restart eclipse. 

After this, you have to modify the ADT to be able to use the Android SDK on Eclipse.

9.  Select window > preferences
10. On the left side, you will see Android. Click Android. A screen like below should appear.

11. Click Browse and locate where you previously downloaded the SDK. 
12. Click apply then OK .