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

<androidx.constraintlayout.widget.ConstraintLayout 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"

    app:layout_behavior="@string/appbar_scrolling_view_behavior">

<!--  app:defaultNavHost="true" でBackボタンやUpボタンが連携される-->

    <fragment

        android:id="@+id/nav_host_fragment"

        android:name="androidx.navigation.fragment.NavHostFragment"

        android:layout_width="0dp"

        android:layout_height="0dp"

        app:defaultNavHost="true"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        app:navGraph="@navigation/nav_graph" />

</androidx.constraintlayout.widget.ConstraintLayout>