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constraint_example_x1.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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/one"
        app:layout_constraintRight_toLeftOf="@+id/button11"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/button14"
        app:layout_constraintTop_toBottomOf="@+id/button5" />

<Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/four"
        app:layout_constraintRight_toLeftOf="@+id/button13"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/button4"
        app:layout_constraintTop_toBottomOf="@+id/button7" />

<Button
        android:id="@+id/button6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/six"
        app:layout_constraintRight_toLeftOf="@+id/button23"
        app:layout_constraintLeft_toRightOf="@+id/button13"
        app:layout_constraintBottom_toTopOf="@+id/button12"
        app:layout_constraintTop_toBottomOf="@+id/button9" />

<TextView
        android:id="@+id/textView3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/advanced_chains"
        android:textSize="30sp"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginTop="20dp"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp" />

<Button
        android:id="@+id/button7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/seven"
        app:layout_constraintRight_toLeftOf="@+id/button8"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/button5"
        app:layout_constraintTop_toBottomOf="@+id/textView6" />

<Button
        android:id="@+id/button8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/eight"
        app:layout_constraintRight_toLeftOf="@+id/button9"
        app:layout_constraintLeft_toRightOf="@+id/button7"
        app:layout_constraintBottom_toTopOf="@+id/button13"
        app:layout_constraintTop_toBottomOf="@+id/textView6" />

<Button
        android:id="@+id/button9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/nine"
        app:layout_constraintRight_toLeftOf="@+id/button22"
        app:layout_constraintLeft_toRightOf="@+id/button8"
        app:layout_constraintBottom_toTopOf="@+id/button6"
        app:layout_constraintTop_toBottomOf="@+id/textView6" />

<Button
        android:id="@+id/button10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/zero"
        app:layout_constraintRight_toLeftOf="@+id/button25"
        app:layout_constraintLeft_toRightOf="@+id/button14"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button11" />

<Button
        android:id="@+id/button11"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/two"
        app:layout_constraintRight_toLeftOf="@+id/button12"
        app:layout_constraintLeft_toRightOf="@+id/button4"
        app:layout_constraintBottom_toTopOf="@+id/button10"
        app:layout_constraintTop_toBottomOf="@+id/button13" />

<Button
        android:id="@+id/button12"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/three"
        app:layout_constraintRight_toLeftOf="@+id/button24"
        app:layout_constraintLeft_toRightOf="@+id/button11"
        app:layout_constraintBottom_toTopOf="@+id/button25"
        app:layout_constraintTop_toBottomOf="@+id/button6" />

<Button
        android:id="@+id/button13"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/five"
        app:layout_constraintRight_toLeftOf="@+id/button6"
        app:layout_constraintLeft_toRightOf="@+id/button5"
        app:layout_constraintBottom_toTopOf="@+id/button11"
        app:layout_constraintTop_toBottomOf="@+id/button8" />

<TextView
        android:id="@+id/textView6"
        android:layout_width="0dp"
        android:layout_height="49dp"
        android:background="#BB9"
        android:text="@string/zero_point_zero"
        android:textAlignment="viewEnd"
        android:textSize="30sp"
        app:layout_constraintLeft_toLeftOf="@+id/button7"
        app:layout_constraintRight_toRightOf="@+id/button22"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        android:layout_marginTop="24dp"
        app:layout_constraintTop_toBottomOf="@+id/textView3"
        tools:layout_constraintLeft_creator="1" />

<Button
        android:id="@+id/button14"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/dot"
        app:layout_constraintRight_toLeftOf="@+id/button10"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button4" />

<Button
        android:id="@+id/button22"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/divide"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/button9"
        app:layout_constraintBottom_toTopOf="@+id/button23"
        app:layout_constraintTop_toBottomOf="@+id/textView6" />

<Button
        android:id="@+id/button23"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/multiply"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/button6"
        app:layout_constraintBottom_toTopOf="@+id/button24"
        app:layout_constraintTop_toBottomOf="@+id/button22" />

<Button
        android:id="@+id/button24"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/add"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/button12"
        app:layout_constraintBottom_toTopOf="@+id/button26"
        app:layout_constraintTop_toBottomOf="@+id/button23" />

<Button
        android:id="@+id/button25"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/equals"
        app:layout_constraintRight_toLeftOf="@+id/button26"
        app:layout_constraintLeft_toRightOf="@+id/button10"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button12" />

<Button
        android:id="@+id/button26"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/subtract"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/button25"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button24" />

</android.support.constraint.ConstraintLayout>