Relative Layout does not scroll after adding scrollview

Good day. I have a layout code shown below

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fillViewport="true" >

    <RelativeLayout xmlns:android="http://ift.tt/nIICcg"
        xmlns:tools="http://ift.tt/LrGmb4"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        tools:context=".MainActivity">

        <include
            android:id="@+id/toolbar"
            layout="@layout/app_bar" />


        <android.support.v4.view.ViewPager
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="165dp"
            android:layout_below="@+id/toolbar" />

        <RelativeLayout
            android:id="@+id/relativeLayout"
            android:layout_width="match_parent"
            android:layout_height="25dp"
            android:layout_alignBottom="@id/viewpager"
            android:background="#33000000">

            <TextView
                android:id="@+id/tv_image_description"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_centerVertical="true"
                android:paddingLeft="10dp"
                android:text="Shop Name"
                android:textColor="#FFF" />


            <LinearLayout
                android:id="@+id/ll_point_group"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentEnd="true"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:orientation="horizontal"
                android:paddingRight="10dp">

            </LinearLayout>
        </RelativeLayout>


        <android.support.v7.widget.RecyclerView
            android:id="@+id/cardList"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/relativeLayout" />


    </RelativeLayout>
</ScrollView>

I have connected my recyclerview with a list of data but why is RecyclerView Layout is scrollable but not the entire Relativelayout. I have wrapped the RelativeLayout with ScrollView. it seems like not working. please see the image below

Do let me know if you guys have better solution for this. Billion thanks.