Clicking hamburger icon on Toolbar does not open Navigation Drawer

Question

I have a simple android.support.v7.widget.Toolbar and all I am trying to do is to open a NavigationDrawer by pressing the \"hamburger\" icon in the top left cor

Answer 1

If none of the above answer works, please cross check again,

First you need to call setSupportActionBar(toolbar); and then do the necessary work for nav drawer. I wasted my 2 hours because of this silly mistake.