Bottom navigation menu based on the user logged in Kotlin

Question

Is it possible to hide/show the bottom navigation menu item in Kotlin based on the user logged in? I have some items in the bottom navigation which I do not want to show to all the users.

Edit: Here is my code.

I want to remove @+id/navigation_products from the menu when the users are not, for example, abc and xyz.

bottom_nav_menu.xml

    <?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/navigation_dashboard"
        android:icon="@drawable/ic_vector_dashboard"
        android:title="@string/title_dashboard" />

    <item
        android:id="@+id/navigation_products"
        android:icon="@drawable/ic_vector_products"
        android:title="@string/title_products" />

    <item
        android:id="@+id/navigation_orders"
        android:icon="@drawable/ic_vector_orders"
        android:title="@string/title_orders" />

    <item
        android:id="@+id/navigation_sold_products"
        android:icon="@drawable/ic_vector_sold_products"
        android:title="@string/title_sold_products" />

    <item
        android:id="@+id/navigation_orders_by_status"
        android:icon="@drawable/ic_vector_sold_products"
        android:title="@string/title_orders_by_status" />
</menu>

mobile_navigation.xml

    <?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mobile_navigation"
    app:startDestination="@+id/navigation_dashboard">

    <fragment
        android:id="@+id/navigation_dashboard"
        android:name="com.ui.fragments.DashboardFragment"
        android:label="@string/title_dashboard"
        tools:layout="@layout/fragment_dashboard" />

    <fragment
        android:id="@+id/navigation_products"
        android:name="com.ui.fragments.ProductsFragment"
        android:label="@string/title_products"
        tools:layout="@layout/fragment_products" />

    <fragment
        android:id="@+id/navigation_orders"
        android:name="com.ui.fragments.OrdersFragment"
        android:label="@string/title_orders"
        tools:layout="@layout/fragment_orders" />

    <fragment
        android:id="@+id/navigation_sold_products"
        android:name="com.ui.fragments.SoldProductsFragment"
        android:label="@string/title_sold_products"
        tools:layout="@layout/fragment_sold_products" />

    <fragment
        android:id="@+id/navigation_orders_by_status"
        android:name="com.ui.fragments.OrdersByStatusFragment"
        android:label="@string/title_orders_by_status"
        tools:layout="@layout/fragment_sold_products" />
</navigation>

DashboardActivity.kt

class DashboardActivity : BaseActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dashboard)

        supportActionBar!!.setBackgroundDrawable(
            ContextCompat.getDrawable(
                this@DashboardActivity,
                R.drawable.app_gradient_color_background
            )
        )

        val navView: BottomNavigationView = findViewById(R.id.nav_view)

        val navController = findNavController(R.id.nav_host_fragment)
      
        val appBarConfiguration = AppBarConfiguration(
            setOf(
                R.id.navigation_products,
                R.id.navigation_dashboard,
                R.id.navigation_orders,
                R.id.navigation_sold_products,
                R.id.navigation_orders_by_status
            )
        )
        setupActionBarWithNavController(navController, appBarConfiguration)

        navView.setupWithNavController(navController)
    }

    override fun onBackPressed() {
        doubleBackToExit()
    }

}

Answer 1

You can launch the app with the entire menu items and then remove items based on the logged-in user:

Here is an extension function to the BottonNavigationView that can remove an item with a certain id

fun BottomNavigationView.removeItem(id: Int) {
    if (menu.findItem(id) != null)
        menu.removeItem(id)
}

And then you can apply it on the logged-in user:

// check logged-in user
when (loggdUser) {

    user_a -> {
        bottomNavView.removeItem(R.id.menu_item_id1)
        bottomNavView.removeItem(R.id.menu_item_id2)
    }

    user_b -> bottomNavView.removeItem(R.id.menu_item_id2)

}

menu_item_idx is supposed menu ids & bottomNavView is the BottomNavigationView instance; so replace them to yours

UPDATE:

Testing that in the code:

class DashboardActivity : BaseActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dashboard)

        supportActionBar!!.setBackgroundDrawable(
            ContextCompat.getDrawable(
                this@DashboardActivity,
                R.drawable.app_gradient_color_background
            )
        )

        val navView: BottomNavigationView = findViewById(R.id.nav_view)

        val navController = findNavController(R.id.nav_host_fragment)
      
        val appBarConfiguration = AppBarConfiguration(
            setOf(
                R.id.navigation_products,
                R.id.navigation_dashboard,
                R.id.navigation_orders,
                R.id.navigation_sold_products,
                R.id.navigation_orders_by_status
            )
        )
        setupActionBarWithNavController(navController, appBarConfiguration)

        navView.setupWithNavController(navController)

        
        val loggdUser = "user_a"
        // check logged-in user
        when (loggdUser) {

            "user_a" -> {
                navView.removeItem(R.id.navigation_orders_by_status)
                navView.removeItem(R.id.navigation_orders)
            }

            "user_b" -> navView.removeItem(R.id.navigation_orders)

        }

    }


    fun BottomNavigationView.removeItem(id: Int) {
        if (menu.findItem(id) != null)
            menu.removeItem(id)
    }


}