Step 3: Installing ADTADT stands for "Android Development Tools". It is the plug-in designed to make Eclipse the most powerful Android App development environment. By Installing ADT, Eclipse is enabled and empowered to develop Android app of any sort.
To get more details , read : http://developer.android.com/sdk/installing/installing-adt.html
Ok, I m going to do it now...
I start Eclipse, and go to help>install new software
you will get 2 "Available Software"s. Developer tools are the one I need for the moment. NDK as I know stands for "Native Development Kit" which allow developers to include C++ code in to Android program code which I don't need (may be fore ever :) )
ADT started downloading..I think things going ok.
What is Android SDK by the way? I will write in next post.