setup android on eclipse but don't know SDK directory

Question

According to the beginner guide, to setup the ADT Plugin, one of the procedures is

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

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Answer 1

ADT Plugin (UNSUPPORTED)

The Eclipse ADT plugin is no longer supported, as per this announcement in June 2015.

The Eclipse ADT plugin has many known bugs and potential security bugs that will not be fixed.

You should immediately switch to use Android Studio, the official IDE for Android.

For help transitioning your projects, read Migrate to Android Studio.