Installing the Eclipse Plugin for ADT

http://developer.android.com/sdk/installing/installing-adt.html

Download the ADT Plugin

1. Start Eclipse, then select Help > Install New
   Software.


2. Click Add, in the top-right corner.


3. In the Add Repository dialog that appears, enter "ADT Plugin" for the
   Name and the following URL for the Location:

   https://dl-ssl.google.com/android/eclipse/

   
   

   Note: The Android Developer Tools update site requires a
   secure connection. Make sure the update site URL you enter starts with
   HTTPS.



4. Click OK.


5. In the Available Software dialog, select the checkbox next to Developer
   Tools and click Next.


6. In the next window, you‘ll see a list of the tools to be downloaded. Click
   Next.


7. Read and accept the license agreements, then click
   Finish.

   If you get a security warning saying that the authenticity or validity of
   the software can‘t be established, click OK.



8. When the installation completes, restart Eclipse.