07-26 ConstraintLayout

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <Button
        android:id="@+id/button18"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="@+id/button17"
        app:layout_constraintEnd_toStartOf="@+id/button19"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button17" />

    <Button
        android:id="@+id/button19"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="@+id/button18"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button18" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="80dp" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="144dp" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="219dp" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="270dp" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="479dp" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="597dp" />

    <Button
        android:id="@+id/button15"
        android:layout_width="402dp"
        android:layout_height="70dp"
        android:layout_marginTop="4dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline5"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button16"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginBottom="8dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline6"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button17"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline7"
        app:layout_constraintEnd_toStartOf="@+id/button18"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button20"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="40dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline8"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button21"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="64dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="@+id/button20"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:id="@+id/button22"
        android:layout_width="203dp"
        android:layout_height="188dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline9"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.105"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline8"
        app:layout_constraintVertical_bias="0.641" />

    <Button
        android:id="@+id/button23"
        android:layout_width="126dp"
        android:layout_height="80dp"
        android:layout_marginStart="20dp"
        android:layout_marginBottom="32dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline10"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button24"
        android:layout_width="71dp"
        android:layout_height="59dp"
        android:layout_marginStart="8dp"
        android:layout_marginBottom="8dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="@+id/button23"
        app:layout_constraintStart_toEndOf="@+id/button23" />

    <Button
        android:id="@+id/button25"
        android:layout_width="45dp"
        android:layout_height="40dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/button32"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline10" />

    <Button
        android:id="@+id/button30"
        android:layout_width="45dp"
        android:layout_height="40dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="@+id/button32"
        app:layout_constraintEnd_toStartOf="@+id/button31"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button32" />

    <Button
        android:id="@+id/button32"
        android:layout_width="45dp"
        android:layout_height="40dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="@+id/button25"
        app:layout_constraintEnd_toStartOf="@+id/button30"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button25" />

    <Button
        android:id="@+id/button31"
        android:layout_width="45dp"
        android:layout_height="40dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="@+id/button30"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button30" />

</androidx.constraintlayout.widget.ConstraintLayout>