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constraintset_example_main.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:id="@+id/activity_constraintset_example"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

<ImageView
        android:id="@+id/imageView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:onClick="toggleMode"
        android:scaleType="centerCrop"
        android:src="@drawable/lake"
        app:layout_constraintBottom_toBottomOf="@+id/textView9"
        app:layout_constraintDimensionRatio="w,16:9"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="@+id/textView9"
        tools:layout_constraintBottom_creator="1"
        tools:layout_constraintTop_creator="1"
        android:contentDescription="@string/lake_tahoe_image"
        app:layout_constraintVertical_bias="0.0" />

<TextView
        android:id="@+id/textView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="16dp"
        android:text="@string/lake_tahoe_title"
        android:textSize="30sp"
        app:layout_constraintLeft_toRightOf="@+id/imageView"
        app:layout_constraintTop_toTopOf="parent" />

<TextView
        android:id="@+id/textView11"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="24dp"
        android:text="@string/lake_discription"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView"
        tools:layout_constraintBottom_creator="1"
        tools:layout_constraintLeft_creator="1"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintTop_creator="1" />

</android.support.constraint.ConstraintLayout>