Downloading the Eclipsc from the following link.
The "Eclipse Classic" version is recommended.
Downloading the "Software Development Kit"
The SDK starter package is not a full development environment—it includes only the core SDK Tools, which you can use to download the rest of the SDK components (such as the latest Android platform).
Installing ADT (Android Development Tool) for the Eclipsc.
Adding ADT to Eclipsc.
Help > Install New Software.... > add the downloaded ADT and click "OK".
Adding the Downloaded SDK
Window > Preferences > Then a window will open...
In that select Android. Then click on browse and target the downloaded sdk and click on ok.
That's it. Installation completed.
For the Step 5 we need INTERNET.