androidkotlinandroid-jetpackandroid-architecture-navigation

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


I have screen like below which contain a navigation drawer and bottom navigation on same screen:

app screen

I am using Jetpack Navigation Architecture Component.

Current issue and What I have tried?

Clicking on the 2nd and 3rd bottom nav item shows back arrow on toolbar?

Tried: setting fragments associated with 2nd and 3rd bottom nav to top level destinations

appBarConfig = AppBarConfiguration(setOf(R.layout.fragment_star, R.layout.fragment_stats, R.layout.fragment_user))

instead of

appBarConfig = AppBarConfiguration(navController.graph, drawerLayout)

Did not worked.

Any help highly appreciated!


My code look like below.

activity_main.xml

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

    <androidx.drawerlayout.widget.DrawerLayout
        android:id="@+id/drawerLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

            <fragment
                android:id="@+id/navHostFragment"
                android:name="androidx.navigation.fragment.NavHostFragment"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                app:defaultNavHost="true"
                app:navGraph="@navigation/nav_graph" />

            <com.google.android.material.bottomnavigation.BottomNavigationView
                android:id="@+id/bottomNav"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom"
                android:background="?android:attr/windowBackground"
                app:menu="@menu/menu_bottom" />

        </LinearLayout>

        <!-- gives navDrawer material look-->
        <com.google.android.material.navigation.NavigationView
            android:id="@+id/navView"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            app:menu="@menu/nav_drawer_menu"
            app:headerLayout="@layout/nav_header"
            android:fitsSystemWindows="true"
            />
    </androidx.drawerlayout.widget.DrawerLayout>
</layout>

menu_bottom.xml

<?xml version="1.0" encoding="utf-8"?>
<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"/>

    <item
        android:id="@+id/statsFragment"
        android:icon="@drawable/ic_stats_green_48dp"
        android:title="@string/bottom_nav_title_stats"/>

    <item
        android:id="@+id/userFragment"
        android:icon="@drawable/ic_user_green_48dp"
        android:title="@string/bottom_nav_title_user"/>

</menu>

nav_graph.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/nav_graph_main"
            app:startDestination="@id/starFragment">

    <fragment
        android:id="@+id/starFragment"
        android:name="com.example.app.ui.StarrFragment"
        android:label="Star"
        tools:layout="@layout/fragment_star">
    </fragment>
    <fragment
        android:id="@+id/statsFragment"
        android:name="com.example.app.StatsFragment"
        android:label="fragment_stats"
        tools:layout="@layout/fragment_stats" />
    <fragment
        android:id="@+id/userFragment"
        android:name="com.example.app.UserFragment"
        android:label="fragment_user"
        tools:layout="@layout/fragment_user" />
</navigation>

ActivityMain.kt

class MainActivity : AppCompatActivity() {

    private lateinit var drawerLayout: DrawerLayout
    private lateinit var appBarConfig: AppBarConfiguration
    private lateinit var navController: NavController

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val binding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
        setSupportActionBar(toolbar)

        drawerLayout = binding.drawerLayout
        navController = this.findNavController(R.id.navHostFragment)

        binding.bottomNav.setupWithNavController(navController)

        NavigationUI.setupActionBarWithNavController(this, navController, drawerLayout)
        appBarConfig = AppBarConfiguration(navController.graph, drawerLayout)


        // lock drawer when not in start destination
        navController.addOnDestinationChangedListener { nc, nd, _ ->

            if(nd.id == nc.graph.startDestination){
                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
            }
            else{
                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
            }
        }

         NavigationUI.setupWithNavController(binding.navView, navController)
    }

    override fun onSupportNavigateUp(): Boolean {

        // replace navigation up button with nav drawer button when on start destination
        return NavigationUI.navigateUp(navController, appBarConfig)

    }
}

Solution

  • 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 :)