Using RecyclerView inside ViewPager inside ContraintLayout

Question

I'm using a ConstraintLayout for my view. Inside it I placed a ViewPager and one of the views that the adapter contains is a RecyclerView.

When I try to put just images, there's a missing height where I can't scroll anymore. That height looks to be the same than the space I'm using on the top (Toolbar + TabLayout).

When using RelativeLayout instead of ConstraintLayout it works

<?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">

    <RelativeLayout
        android:id="@+id/homeToolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/toolbarColor">

        <android.support.v7.widget.AppCompatImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="8dp"
            android:padding="7dp"
            android:src="@drawable/ic_menu"
            tools:ignore="RtlHardcoded" />

        <android.support.v7.widget.AppCompatImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:gravity="center"
            android:orientation="horizontal"
            tools:ignore="RtlHardcoded">

            <android.support.v7.widget.AppCompatImageView
                style="@style/RippleEffect"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="5dp"
                android:padding="7dp" />

            <android.support.v7.widget.AppCompatImageView
                style="@style/RippleEffect"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="5dp"
                android:padding="7dp"
                android:src="@drawable/ic_search" />
        </LinearLayout>
    </RelativeLayout>

    <android.support.design.widget.TabLayout
        android:id="@+id/homeTabLayout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="@color/toolbarColor"
        app:layout_constraintTop_toBottomOf="@+id/homeToolbar"
        app:tabMode="scrollable" />

    <android.support.v4.view.ViewPager
        android:id="@+id/homeViewPager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@+id/homeTabLayout"

        />
</android.support.constraint.ConstraintLayout>

This is what I see (see the last Darth Vader)

Answer 1

Solved by adding

app:layout_constraintBottom_toBottomOf="parent"

To the ViewPager