circolapp/app/src/main/res/layout/fragment_school_selection.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"
    android:paddingTop="@dimen/appintro_statusbar_height"
    android:paddingBottom="@dimen/appintro2_bottombar_height"
    android:background="@color/colorPrimary">

    <TextView
        android:id="@+id/school_selection_title"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:gravity="center"
        app:layout_constraintVertical_weight="2"
        app:layout_constraintBottom_toTopOf="@+id/school_selection_spinner"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_chainStyle="spread"
        style="@style/AppIntroDefaultHeading"
        android:text="@string/activity_intro_school_selection_title" />

    <com.tiper.MaterialSpinner
        android:id="@+id/school_selection_spinner"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        android:hint="@string/activity_intro_school_selection_hint"
        style="@style/Widget.MaterialComponents.TextInputLayout.FilledBox.Dense"
        app:spinnerMode="bottomsheet"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/school_selection_note"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:autoLink="web"
        app:layout_constraintVertical_weight="3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/school_selection_spinner"
        style="@style/AppIntroDefaultText"
        android:text="@string/activity_intro_school_selection_description" />


</androidx.constraintlayout.widget.ConstraintLayout>