Let's start Android Development tutorial with snapshots

I have Eclipse Ganymede and i have started development on it you can do it easily just follow the steps

Go to :Download SDK

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

Start Eclipse, then select Help > Software Updates.... In the dialog that appears, click the Available Software tab.

Click Add Site...

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

Note: If you have trouble aqcuiring the plugin, try using "http" in the Location URL, instead of "https" (https is preferred for security reasons).
Click OK.

 

Back in the Available Software view, you should see the plugin listed by the URL, with "Developer Tools" nested within it. Select the checkbox next to Developer Tools and click Install...



On the subsequent Install window, "Android DDMS" and "Android Development Tools" should both be checked. Click Next.  
 Read and accept the license agreement, then click Finish.
Restart Eclipse.  

Now modify your Eclipse preferences to point to the Android SDK directory:

1. Select Window > Preferences... to open the Preferences panel (Mac OS X: Eclipse > Preferences).
   
   
   
   
   
   
2. Select Android from the left panel.
3. For the SDK Location in the main panel, click Browse... and locate your downloaded SDK directory.
4. Click Apply, then OK.
   
   
   
   
   
5. In the Add Site dialog that appears, enter this URL in the "Location" field:

 

 

 

Done! If you haven't encountered any problems, then you're ready to begin developing Android applications.

 

   

Reference: http://developer.android.com/sdk/eclipse-adt.html