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 it helps somebody, to me it happened the same because of the stupid error of calling setSupportActionBar(toolbar) two times. Just call it once in onCreate method and never again. My mistake was I called it later in another method.