Eclipse
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: If you have trouble acquiring the plugin, try using "http" in the Location URL, instead of "https" (https is preferred for security reasons).
Click OK.
4 In the Available Software dialog, select the checkbox next to Developer Tools and click Next.
5 In the next window, you'll see a list of the tools to be downloaded. Click Next.
6 Read and accept the license agreements, then click Finish.
7 When the installation completes, restart Eclipse.