Android : Android L: ActionBar setHideOnContentScrollEnabled

I'm trying to use the setHideOnContentScrollEnabled and setHideOffset in the new L API. However, none of the mentioned functions seem to have any effect. Anyone else encountered the same issue?

My Activity's layout is a ScrollView with a TextView displaying a large amount of text, so there are def scrolling. I have also, as required by the documentation, added FEATURE_ACTION_BAR_OVERLAY

    getWindow().requestFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
    setContentView(R.layout.main_activity);

    getActionBar().setHideOnContentScrollEnabled(true);
    getActionBar().setHideOffset(40);