I'm trying to implement the Navigation Drawer as shown here: http://developer.android.com/training/implementing-navigation/nav-drawer.html#top
My code seems to be ok, and My minimum and target levels in my manifest match the example, but it's telling me it can't find the following three references
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;