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constraint_example_2.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="0dp"
        android:layout_height="wrap_content"
        android:text="@string/button_1"
        app:layout_constraintDimensionRatio="w,16:9"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button5"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        app:layout_constraintRight_toRightOf="parent"
        tools:layout_constraintLeft_creator="1"
        android:layout_marginBottom="19dp"
        app:layout_constraintLeft_toLeftOf="parent" />

<Button
        android:id="@+id/button5"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/button_text"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button6"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintRight_toRightOf="parent"
        tools:layout_constraintLeft_creator="1"
        android:layout_marginBottom="16dp"
        app:layout_constraintLeft_toLeftOf="parent" />

<Button
        android:id="@+id/button6"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/button_text_12"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button7"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintRight_toRightOf="parent"
        tools:layout_constraintLeft_creator="1"
        android:layout_marginBottom="16dp"
        app:layout_constraintLeft_toLeftOf="parent" />

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

<Button
        android:id="@+id/button7"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/button_text"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toTopOf="@+id/button8"
        app:layout_constraintRight_toRightOf="@+id/button6"
        tools:layout_constraintLeft_creator="1"
        android:layout_marginBottom="16dp"
        app:layout_constraintLeft_toLeftOf="@+id/button6" />

<Button
        android:id="@+id/button8"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/button_text"
        tools:layout_constraintRight_creator="1"
        app:layout_constraintRight_toRightOf="@+id/button7"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="@+id/button7"
        app:layout_constraintBottom_toTopOf="@+id/button27"
        android:layout_marginBottom="104dp"
        app:layout_constraintHorizontal_bias="1.0" />

<Button
        android:id="@+id/button27"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintRight_toLeftOf="@+id/button29"
        app:layout_constraintLeft_toRightOf="@+id/button28"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="38dp" />

<Button
        android:id="@+id/button28"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintRight_toLeftOf="@+id/button27"
        app:layout_constraintLeft_toLeftOf="parent"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="38dp" />

<Button
        android:id="@+id/button29"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/button27"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="38dp" />
</android.support.constraint.ConstraintLayout>