activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

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

</android.support.constraint.ConstraintLayout>

CarListFragment.kt

... some code



NavHostFragment.findNavController(this)
                .navigate(R.id.action_carListFragment_to_carFragment)



... some code

cars_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"
    android:id="@+id/cars_nav_graph"
    app:startDestination="@id/carListFragment">

    <fragment
        android:id="@+id/carListFragment"
        android:name="com.example.car.CarListFragment"
        android:label="CarListFragment">
        <action
            android:id="@+id/action_carListFragment_to_carFragment"
            app:destination="@id/carFragment" />

    </fragment>

    <fragment
        android:id="@+id/carFragment"
        android:name="com.example.car.CarFragment"
        android:label="CarFragment" />

</navigation>

main_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"
    app:startDestination="@id/mainFragment">

    <fragment
        android:id="@+id/mainFragment"
        android:name="com.example.main.MainFragment"
        android:label="MainFragment"
        tools:layout="@layout/fragment_main">

        <action
            android:id="@+id/action_mainFragment_to_cars_nav_graph"
            app:destination="@id/cars_nav_graph" />

    </fragment>

    <include app:graph="@navigation/cars_nav_graph" />

</navigation>