ntfy-android/app/src/main/res/layout/main_activity.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"
                                                   android:layout_width="match_parent"
                                                   android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/main_subscriptions_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clickable="true"
            android:focusable="true"
            android:background="?android:attr/selectableItemBackground"
            app:layoutManager="LinearLayoutManager" android:visibility="gone"/>

    <TextView
            android:id="@+id/main_no_subscriptions_text"
            android:text="@string/main_no_subscriptions_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintEnd_toEndOf="parent" android:textAppearance="@style/TextAppearance.AppCompat.Large"
            android:padding="50dp" app:layout_constraintBottom_toBottomOf="parent" android:gravity="center_horizontal"
            android:textStyle="italic"/>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:contentDescription="@string/main_add_button_description"
        android:src="@drawable/ic_add_black_24dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>