Drawer.kt

protected fun setupDrawer() {
  drawerToggle = object : ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.app_name, R.string.app_name) {}
  drawerLayout?.addDrawerListener(drawerToggle as ActionBarDrawerToggle)
  navigationView?.setNavigationItemSelectedListener { item ->

    when (item.itemId) {
      R.id.logout -> {

      }
    }

    drawerLayout?.closeDrawers()
    true
  }
}

override fun onOptionsItemSelected(item: MenuItem?): Boolean {
  if (item!!.itemId == android.R.id.home) {
    if (drawerToggle != null) {
      return drawerToggle!!.onOptionsItemSelected(item)
    } else onBackPressed()
  }
  return super.onOptionsItemSelected(item)
}

override fun onResume() {
  super.onResume()
  if (drawerToggle != null)
    drawerToggle?.syncState()
}

override fun onConfigurationChanged(newConfig: Configuration?) {
  super.onConfigurationChanged(newConfig)
  if (drawerToggle != null)
    drawerToggle?.onConfigurationChanged(newConfig)
}

override fun onBackPressed() {
  if (drawerLayout != null) {
    if (drawerLayout!!.isDrawerOpen(Gravity.LEFT)) {
      drawerLayout?.closeDrawers()
      return
    }
  }
  super.onBackPressed()
}