constrains_sample.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:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        app:layout_constraintBottom_toTopOf="@+id/ivBottom"
        android:background="@android:color/holo_blue_dark"
        android:id="@+id/ivTop"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_weight="0.7"
        android:layout_width="0dp"
        android:layout_height="0dp" />
    
    <ImageView
        app:layout_constraintTop_toTopOf="@id/ivTop"
        app:layout_constraintBottom_toBottomOf="@id/ivTop"
        app:layout_constraintLeft_toLeftOf="@id/ivTop"
        app:layout_constraintRight_toRightOf="@id/ivTop"
        tools:src='@tools:sample/avatars'
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    
    <TextView
        app:layout_constraintVertical_bias="0.8"
        app:layout_constraintTop_toTopOf="@id/ivTop"
        app:layout_constraintBottom_toBottomOf="@id/ivTop"
        app:layout_constraintLeft_toLeftOf="@id/ivTop"
        app:layout_constraintRight_toRightOf="@id/ivTop"
        android:text="ON"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Space
        app:layout_constraintVertical_weight="0.3"
        app:layout_constraintTop_toBottomOf="@id/ivTop"
        android:id="@+id/ivBottom"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_width="0dp"
        android:layout_height="0dp" />
    
    <Space
        app:layout_constraintVertical_weight="0.65"
        app:layout_constraintBottom_toTopOf="@+id/vSecondCardView"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:id="@+id/ivSecondTop"
        android:layout_width="0dp"
        android:layout_height="0dp" />
    

    <View
        app:layout_constraintVertical_weight="0.35"
        android:background="@android:color/white"
        android:id="@+id/vSecondCardView"
        app:layout_constraintTop_toBottomOf="@id/ivSecondTop"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="15dp"
        android:layout_marginStart="10dp"
        android:layout_marginEnd="10dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_width="0dp"
        android:layout_height="0dp"/>

</android.support.constraint.ConstraintLayout>