app/src/main/res/layout/activity_note_detail.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include layout="@layout/toolbar" />
</com.google.android.material.appbar.AppBarLayout>
<FrameLayout
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab_edit_note"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/twotone_edit_black_48"
app:fabSize="normal"
app:layout_anchor="@id/fragment_container"
app:layout_anchorGravity="bottom|right|end"
android:layout_margin="16dp"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>