First, you need to install Eclipse first by following this site:
Second, you need to install Android SDK from this link:
Third, you need to install ADT (Andoid Drevelopment Tools) from this link:
Finally, go to SDK directory installation from Terminal. Then goto tools directory and run below “android update sdk”
aoddy$ android update sdk
If you don’t run this command, you cannot see a list of SDK tarket.