The import android.support cannot be resolved

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http://stackoverflow.com – I am trying to run the code provided HERE I downloaded the code from their Github and imported into Android SDK, but it shows error at the lines import android.support.v4.app.FragmentActivity; import android.support.v4.app.NavUtils; in multiple files. However if I check the Android SDK Manager, the Android Support Library as we as the Android Support Repository in the Extras folder are both installed. I can also see the support folder and it's contents in the SDK_INSTALL\sdk\extras\android\support directory. It also has the v4 folder which also contains the android-support-v4.jar and th (HowTos)