Apps Easy Q about which Android Packages i need.

[shady_iller]

I am setting up Eclipse and I want to know if it's necessary to download all of the previous APIs or do I just need the new API 8. Below are my installed and available packages.

Thanks for your help

 

[shady_iller]

Adding SDK Components | Android Developers
never mind, i guess i need to install them all if I want to test my app on all android versions. Thanks