how to remove shadow below actionbar with AppCompat.Light.NoActionBar?

Question

I tried to remove the shadow below the toolbar with the Theme.AppCompat.Light.NoActionBar, using every recommendation of people who have ever answer it before, but no one wo

Answer 1

@DmitryO Hum my xml is like this, i don't have android.support.design.widget.AppBarLayout, just the toolbar widget,

Have I to had this ? (I think this will not change the result)