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constraint_example_6.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/button"
        app:layout_constraintBottom_toTopOf="@+id/button5"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.74"
        app:layout_constraintRight_toRightOf="@+id/button5"
        app:layout_constraintVertical_chainStyle="packed" />

<Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintBottom_toTopOf="@+id/button6"
        app:layout_constraintTop_toBottomOf="@+id/button4"
        app:layout_constraintRight_toRightOf="@+id/button6" />

<Button
        android:id="@+id/button6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintBottom_toTopOf="@+id/button7"
        app:layout_constraintTop_toBottomOf="@+id/button5"
        app:layout_constraintRight_toRightOf="@+id/button7" />

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

<Button
        android:id="@+id/button7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintBottom_toTopOf="@+id/button8"
        app:layout_constraintTop_toBottomOf="@+id/button6"
        app:layout_constraintRight_toRightOf="@+id/button8" />

<Button
        android:id="@+id/button8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button7"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/button9"
        app:layout_constraintHorizontal_bias="0.42" />

<Button
        android:id="@+id/button9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintRight_toLeftOf="@+id/button10"
        app:layout_constraintLeft_toRightOf="@+id/button8"
        app:layout_constraintTop_toTopOf="@+id/button8" />

<Button
        android:id="@+id/button10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/button9"
        app:layout_constraintTop_toTopOf="@+id/button9" />

</android.support.constraint.ConstraintLayout>