fragment_action_view_samples.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#eee"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <io.github.vejei.bottomnavigationbar.BottomNavigationBar
            android:id="@+id/bar_no_action_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:layout_constraintTop_toTopOf="parent"
            app:navigation_menu="@menu/bottom_nav_four_items" />

        <io.github.vejei.bottomnavigationbar.BottomNavigationBar
            android:id="@+id/bar_action_view_embed"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:layout_constraintTop_toBottomOf="@id/bar_no_action_view"
            app:navigation_menu="@menu/bottom_nav_four_items"
            app:action_layout="@layout/action_layout_embed"/>

        <io.github.vejei.bottomnavigationbar.BottomNavigationBar
            android:id="@+id/bar_action_view_hump"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:layout_constraintTop_toBottomOf="@id/bar_action_view_embed"
            app:navigation_menu="@menu/bottom_nav_four_items"
            app:action_layout="@layout/action_layout_hump"
            app:action_view_attach_mode="hump"
            app:action_view_hump_padding="16dp"/>

        <io.github.vejei.bottomnavigationbar.BottomNavigationBar
            android:id="@+id/bar_action_view_overlap"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:layout_constraintTop_toBottomOf="@id/bar_action_view_hump"
            app:navigation_menu="@menu/bottom_nav_four_items"
            app:action_layout="@layout/action_layout_overlap"
            app:action_view_attach_mode="overlap"/>

        <io.github.vejei.bottomnavigationbar.BottomNavigationBar
            android:id="@+id/bar_action_view_image_overlap"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:layout_constraintTop_toBottomOf="@id/bar_action_view_overlap"
            app:navigation_menu="@menu/bottom_nav_four_items"
            app:action_layout="@layout/action_layout_image_overlap"
            app:action_view_attach_mode="overlap"/>

        <io.github.vejei.bottomnavigationbar.BottomNavigationBar
            android:id="@+id/bar_placeholder_three_item"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:layout_constraintTop_toBottomOf="@id/bar_action_view_image_overlap"
            app:navigation_menu="@menu/bottom_nav_three_items"
            app:action_layout="@layout/action_layout_embed" />

        <io.github.vejei.bottomnavigationbar.BottomNavigationBar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:layout_constraintTop_toBottomOf="@id/bar_placeholder_three_item"
            app:navigation_menu="@menu/bottom_nav_two_items"
            app:action_layout="@layout/action_layout_embed"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</ScrollView>