another-widget/app/src/main/res/layout/fragment_app_main.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:background="?android:attr/colorPrimary"
    tools:context=".ui.activities.MainActivity">
    <com.google.android.material.card.MaterialCardView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintTop_toTopOf="parent"
        app:cardElevation="0dp"
        app:cardCornerRadius="0dp"
        android:id="@+id/toolbar"
        android:transitionName="@string/toolbar_transition_name"
        app:cardBackgroundColor="@color/colorPrimary">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="56dp"
                android:gravity="center_vertical"
                android:paddingLeft="8dp"
                android:paddingRight="8dp">
                <ImageView
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:padding="10dp"
                    android:src="@drawable/round_arrow_back_24"
                    android:clickable="true"
                    android:focusable="true"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    app:tint="@color/colorPrimaryText"
                    android:layout_centerVertical="true"
                    android:layout_alignParentLeft="true"
                    android:visibility="gone"
                    android:id="@+id/action_back"/>
                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:layout_centerInParent="true">
                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="match_parent"
                        android:text="@string/app_name"
                        android:gravity="center"
                        android:textStyle="bold"
                        android:transitionName="title"
                        android:id="@+id/fragment_title"
                        android:layout_marginBottom="1dp"
                        style="@style/AnotherWidget.Main.Title"/>
                </LinearLayout>
                <ImageView
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:padding="8dp"
                    android:src="@drawable/round_short_text_24"
                    android:scaleX="-1"
                    android:clickable="true"
                    android:focusable="true"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    app:tint="@color/colorPrimaryText"
                    android:layout_centerVertical="true"
                    android:layout_alignParentRight="true"
                    android:id="@+id/action_settings"/>
            </RelativeLayout>
            <com.google.android.material.card.MaterialCardView
                android:layout_width="match_parent"
                android:layout_height="140dp"
                android:id="@+id/preview"
                android:animateLayoutChanges="true"
                app:cardBackgroundColor="@color/colorPrimary"
                android:layout_marginRight="16dp"
                android:layout_marginLeft="16dp"
                android:layout_marginBottom="4dp"
                app:cardCornerRadius="9dp"
                app:cardElevation="0dp">
                <androidx.appcompat.widget.AppCompatImageView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:scaleType="fitStart"
                    android:adjustViewBounds="true"
                    android:id="@+id/widget_bg" />
                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_centerInParent="true"
                        android:layout_gravity="center"
                        android:orientation="vertical"
                        android:id="@+id/widget"
                        android:alpha="0"
                        android:gravity="center">
                        <include layout="@layout/the_widget_sans" />
                    </LinearLayout>
                    <ProgressBar
                        android:layout_width="32dp"
                        android:layout_height="32dp"
                        android:layout_centerInParent="true"
                        android:indeterminate="true"
                        android:indeterminateTint="@android:color/white"
                        android:id="@+id/widget_loader" />
                </RelativeLayout>
            </com.google.android.material.card.MaterialCardView>
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="16dp"
                android:orientation="vertical"
                android:id="@+id/bottom_padding" />
        </LinearLayout>
    </com.google.android.material.card.MaterialCardView>
    <com.google.android.material.card.MaterialCardView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@+id/toolbar"
        app:layout_constraintBottom_toBottomOf="parent"
        app:cardElevation="0dp"
        app:cardPreventCornerOverlap="true"
        app:cardCornerRadius="0dp"
        app:cardBackgroundColor="@color/colorPrimaryDark"
        android:orientation="vertical">
        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/settings_fragment"
            android:name="androidx.navigation.fragment.NavHostFragment"
            app:defaultNavHost="false"
            app:navGraph="@navigation/settings_nav_graph"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </com.google.android.material.card.MaterialCardView>
</androidx.constraintlayout.widget.ConstraintLayout>