Toolbar navigation icon never set
Currently you can use it, changing the order: (it seems to be a bug)
Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
setSupportActionBar(toolbar);
toolbar.setNavigationIcon(R.drawable.ic_good);
toolbar.setTitle("Title");
toolbar.setSubtitle("Sub");
toolbar.setLogo(R.drawable.ic_launcher);
Specific to the navigation icon, this is the correct order
// get the actionbar as Toolbar and set it up
Toolbar toolbar = (Toolbar) findViewById(R.id.signIn_toolbar);
setSupportActionBar(toolbar);
Inform the Toolbar to provide back navigation. This will set the icon to the default material icon
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Later override the icon with the custom one, in my case the Holo back icon
toolbar.setNavigationIcon(R.drawable.ic_chevron_left_white_36dp);