Infinity-For-Lemmy/app/src/main/res/layout/activity_subreddit_selection.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/backgroundColor"
    tools:application=".SubredditSelectionActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar_layout_subreddit_selection_activity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?attr/toolbarAndTabBackgroundColor"
        android:theme="@style/AppTheme.AppBarOverlay">

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|enterAlways"
            app:titleEnabled="false"
            app:toolbarId="@+id/toolbar_subreddit_selection_activity">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar_subreddit_selection_activity"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:popupTheme="@style/AppTheme.PopupOverlay"
                app:navigationIcon="?attr/homeAsUpIndicator" />

        </com.google.android.material.appbar.CollapsingToolbarLayout>

    </com.google.android.material.appbar.AppBarLayout>

    <FrameLayout
        android:id="@+id/frame_layout_subreddit_selection_activity"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>