arcanechat-android/res/layout/welcome_page.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
    tools:context=".WelcomeActivity">

    <ImageView
        android:id="@+id/welcome_icon"
        android:layout_width="128dp"
        android:layout_height="128dp"
        android:contentDescription="TODO"
        android:padding="8dp"
        app:layout_constraintBottom_toTopOf="@id/welcome_header"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_chainStyle="packed"/>

    <TextView
        android:id="@+id/welcome_header"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="16dp"
        android:text="Delta bla"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@id/welcome_sub_header"
        app:layout_constraintTop_toBottomOf="@id/welcome_icon"
        app:layout_constraintVertical_chainStyle="packed"/>

    <TextView
        android:id="@+id/welcome_sub_header"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:paddingStart="16dp"
        android:paddingEnd="16dp"
        android:paddingBottom="24dp"
        android:text="dfajsdjasjd djj lorem ispuim dolor sit amentnet 32"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/welcome_header"
        app:layout_constraintVertical_chainStyle="packed"/>

</android.support.constraint.ConstraintLayout>