How to change Navigation Drawer menu item text font in Kotlin

In this android kotlin source code example, we are going to change Navigation Drawer menu item text font in Kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to change Navigation Drawer menu item text font in Kotlin.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".Navigation.NavigationActivity5">

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

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

        <androidx.appcompat.widget.AppCompatTextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Navigation Drawer"
            android:gravity="center_horizontal|center_vertical"/>

        <com.google.android.material.navigation.NavigationView
            android:id="@+id/navigationView"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:theme="@style/NavigationView5"
            app:headerLayout="@layout/drawer_header"
            app:itemTextColor="#000000"
            app:menu="@menu/drawermenu" />

    </androidx.drawerlayout.widget.DrawerLayout>

</RelativeLayout>

layout/drawer_header.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="178dp"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="#9c9c9c"
    android:gravity="bottom"
    android:orientation="vertical"
    android:padding="16dp"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <androidx.appcompat.widget.AppCompatImageView
        android:id="@+id/profile_image"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:layout_marginTop="15dp"
        android:src="@mipmap/ic_launcher"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/username_field"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/profile_image"
        android:text="Username"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:textStyle="bold"
        app:layout_constraintTop_toBottomOf="@id/profile_image"/>

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/email_field"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/username_field"
        android:text="Email"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        app:layout_constraintTop_toBottomOf="@id/username_field"/>

</androidx.constraintlayout.widget.ConstraintLayout>

menu/drawermenu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/nav_item_home"
        android:title="@string/home"/>
    <item
        android:id="@+id/nav_item_blog"
        android:title="@string/blog"/>
    <item
        android:id="@+id/nav_item_app"
        android:title="@string/App"/>
</menu>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.appcompat.widget.Toolbar
import androidx.drawerlayout.widget.DrawerLayout
import com.bluapp.kotlinview.R
import com.google.android.material.navigation.NavigationView

class NavigationActivity5 : AppCompatActivity() {
    private var mDrawerLayout: DrawerLayout? = null
    private var mNavigationView: NavigationView? = null
    private var toolbar: Toolbar? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_navigation5)
        toolbar = findViewById(R.id.toolbar) as Toolbar
        setSupportActionBar(toolbar)
        mDrawerLayout = findViewById(R.id.drawerLayout) as DrawerLayout
        mNavigationView = findViewById(R.id.navigationView) as NavigationView

        val mDrawerToggle = ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.app_name, R.string.app_name)
        mDrawerLayout!!.addDrawerListener(mDrawerToggle)
        mDrawerToggle.syncState()
    }
}

values/styles.xml

 <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

    <style name="AppTheme.NoActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    </style>

 <style name="NavigationView5">
        <item name="fontFamily">@font/font</item>
    </style>

AndroidManifest.xml

<activity
            android:name=".Navigation.NavigationActivity5"
            android:theme="@style/AppTheme.NoActionBar" />

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