Flexible Layout with ConstraintLayout

flexible.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools">

  <LinearLayout
    android:id="@+id/image_container"
    android:layout_width="wrap_content"
    android:layout_height="0dp"
    android:layout_marginTop="11dp"
    android:gravity="center"
    android:orientation="vertical"
    android:paddingBottom="25dp"
    android:paddingLeft="15dp"
    android:paddingRight="15dp"
    android:paddingTop="15dp"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent">

    <android.support.constraint.ConstraintLayout
      android:id="@+id/image_1_container"
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_weight="1">

      <ImageView
        android:id="@+id/image_1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_margin="4dp"
        tools:src="@mipmap/ic_launcher_round"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="1,1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

      <View
        android:id="@+id/image_1_touch_area"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    </android.support.constraint.ConstraintLayout>

    <android.support.constraint.ConstraintLayout
      android:id="@+id/image_2_container"
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_marginTop="10dp"
      android:layout_weight="1">

      <ImageView
        android:id="@+id/image_2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_margin="4dp"
        tools:src="@mipmap/ic_launcher_round"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="1,1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

      <View
        android:id="@+id/image_2_touch_area"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    </android.support.constraint.ConstraintLayout>

    <android.support.constraint.ConstraintLayout
      android:id="@+id/image_3_container"
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_marginTop="10dp"
      android:layout_weight="1">

      <ImageView
        android:id="@+id/image_3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_margin="4dp"
        tools:src="@mipmap/ic_launcher_round"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="1,1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

      <View
        android:id="@+id/image_3_touch_area"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    </android.support.constraint.ConstraintLayout>

    <android.support.constraint.ConstraintLayout
      android:id="@+id/image_4_container"
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_marginTop="10dp"
      android:layout_weight="1">

      <ImageView
        android:id="@+id/image_4"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_margin="4dp"
        tools:src="@mipmap/ic_launcher_round"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="1,1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

      <View
        android:id="@+id/image_4_touch_area"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    </android.support.constraint.ConstraintLayout>

  </LinearLayout>

</android.support.constraint.ConstraintLayout>