How to use Navigation Drawer and Bottom Navigation simultaneously - Navigation Architecture Component

No need of writing separate code to replace the back button with the drawer icon.

In AppBarConfiguration pass the fragment ids (from nav_graph) which you are using to navigate from both bottom navigation & navigation drawer. (P.S fragments and its associated icon should have same ids)

For your case the AppBarConfiguration should look like this :

appBarConfig = AppBarConfiguration.Builder(R.id.starFragment, R.id.statsFragment, R.id.userFragment)
                .setDrawerLayout(drawerLayout)
                .build()

Setup the action bar :

setSupportActionBar(toolbar)
setupActionBarWithNavController(navController, appBarConfig)

Now setup navcontroller for both bottom navigation & navigation view :

navView.setupWithNavController(navController)
bottomNav.setupWithNavController(navController)

onSupportNavigateUp function should should be :

override fun onSupportNavigateUp(): Boolean {
        return navController.navigateUp(appBarConfig)
    }

Back button press should be handled if drawer is open :

override fun onBackPressed() {
        if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
            drawerLayout.closeDrawer(GravityCompat.START)
        } else {
            super.onBackPressed()
        }
    }

Bonus

By default when you click bottom navigation icon in the order icon_1 then icon_2 then icon_3 and from there you press back button it will navigate back to home icon that's icon_1

If you want to navigate back in the reverse order in which you have clicked the icons (back stack manner) then add android:menuCategory="secondary" to the item in the menu. So your menu will be like :

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/starFragment"
        android:icon="@drawable/ic_star_green_48dp"
        android:title="@string/bottom_nav_title_star"
        android:menuCategory="secondary"/>
    <item
        android:id="@+id/statsFragment"
        android:icon="@drawable/ic_stats_green_48dp"
        android:title="@string/bottom_nav_title_stats"
        android:menuCategory="secondary"/>
    <item
        android:id="@+id/userFragment"
        android:icon="@drawable/ic_user_green_48dp"
        android:title="@string/bottom_nav_title_user"
        android:menuCategory="secondary"/>
</menu>

Hope the back button icon will be solved now :)

This project uses DrawerLayout and simulates BottomNavigationView using RadioButtons, this is the way I found to solve the problem

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In the Google Codelab navigation project they do what Adithya T Raj mention but it only serves to show the DrawerLayout on landscape and BottomNavigationView on Portrait. The project link:

I try to force them to show me both on this branch but only the DrawerLayout is shown