OpenEUICC/app/src/main/res/layout/fragment_slot_mapping.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="wrap_content"
    android:layout_height="wrap_content">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:theme="@style/Theme.OpenEUICC"
        android:background="?attr/colorPrimary"
        android:elevation="4dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintWidth_percent="1"
        app:navigationIcon="?homeAsUpIndicator" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/mapping_list"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:paddingTop="6dp"
        app:layout_constraintTop_toBottomOf="@id/toolbar"
        app:layout_constraintBottom_toTopOf="@id/mapping_help"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

    <TextView
        android:id="@+id/mapping_help"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="6dp"
        android:layout_marginBottom="10dp"
        android:layout_marginHorizontal="24dp"
        android:gravity="center"
        android:textSize="12sp"
        android:textColor="?attr/colorSecondary"
        android:textStyle="italic"
        app:layout_constraintTop_toBottomOf="@id/mapping_list"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>