activity_main.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=".MainActivity">

    <ImageView
        android:id="@+id/imgLogo"
        android:src="@drawable/warehouse_workers"
        android:scaleType="fitCenter"
        app:layout_constraintTop_toBottomOf="parent"
        app:layout_constraintBottom_toTopOf="@id/btnPickFile"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

    <Button
        android:id="@+id/btnPickFile"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Load XLS file"
        app:layout_constraintTop_toBottomOf="@id/imgLogo"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnPeek"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Display data"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/btnPickFile" />

</android.support.constraint.ConstraintLayout>