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constraint_example_3.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="0dp"
        android:text="@string/button"
        tools:layout_constraintTop_creator="1"
        android:layout_marginStart="8dp"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="@+id/guideline"
        android:layout_marginLeft="8dp"
        app:layout_constraintBaseline_toBaselineOf="@+id/button5"
        app:layout_constraintRight_toLeftOf="@+id/guideline3"
        android:layout_marginRight="8dp"
        app:layout_constraintHorizontal_bias="0.9" />

<Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintRight_toLeftOf="@+id/guideline2"
        android:layout_marginRight="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintLeft_toLeftOf="@+id/guideline3"
        android:layout_marginLeft="8dp"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintTop_toTopOf="@+id/guideline4"
        android:layout_marginTop="16dp" />

<Button
        android:id="@+id/button6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        app:layout_constraintRight_toLeftOf="@+id/guideline2"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        android:layout_marginEnd="5dp"
        android:layout_marginTop="4dp"
        app:layout_constraintTop_toTopOf="@+id/guideline5"
        android:layout_marginRight="8dp"
        android:layout_marginLeft="8dp"
        app:layout_constraintLeft_toLeftOf="@+id/guideline3"
        app:layout_constraintHorizontal_bias="0.5" />

<TextView
        android:id="@+id/textView3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/guidelines"
        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"
        android:layout_marginLeft="16dp"
        app:layout_constraintHorizontal_bias="0.0"
        android:layout_marginRight="16dp" />

<Button
        android:id="@+id/button7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        tools:layout_constraintTop_creator="1"
        android:layout_marginStart="8dp"
        app:layout_constraintTop_toBottomOf="@+id/button6"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="@+id/guideline"
        android:layout_marginTop="0dp" />

<Button
        android:id="@+id/button8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        tools:layout_constraintTop_creator="1"
        android:layout_marginStart="10dp"
        android:layout_marginTop="8dp"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="@+id/guideline"
        app:layout_constraintTop_toTopOf="@+id/guideline6" />

<android.support.constraint.Guideline
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/guideline"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.15" />

<android.support.constraint.Guideline
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/guideline2"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.85" />

<android.support.constraint.Guideline
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/guideline3"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.5" />

<android.support.constraint.Guideline
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/guideline4"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.15" />

<android.support.constraint.Guideline
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/guideline5"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.50097847" />

<android.support.constraint.Guideline
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/guideline6"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.85" />

</android.support.constraint.ConstraintLayout>