Макет Android - отключить ненужную область

Я создаю собственное всплывающее окно для подтверждения выхода. Для этого я использую RelativeLayout со свойствами layout_width = "match_parent" и layout_height = "match_parent".

Как я могу отключить область WebView для прокрутки и кликов?

<?xml version = "1.0" encoding = "utf-8"?>
<RelativeLayout
    android:id = "@+id/content_main"
    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"
    xmlns:ads = "http://schemas.android.com/apk/res-auto"
    android:layout_width = "match_parent"
    android:layout_height = "match_parent"
    app:layout_behavior = "@string/appbar_scrolling_view_behavior"
    tools:context = ".MainActivity"
    tools:showIn = "@layout/app_bar_main">

    <ScrollView
        android:layout_width = "match_parent"
        android:layout_height = "match_parent"
        android:layout_above = "@+id/banner_main">

            <WebView
                android:id = "@+id/web"
                android:layout_width = "match_parent"
                android:layout_height = "match_parent"
                android:minHeight = "400dp" />

    </ScrollView>

    <RelativeLayout
        android:id = "@+id/exit_popup"
        android:layout_width = "match_parent"
        android:layout_height = "match_parent"
        android:layout_margin = "0dp"
        android:orientation = "vertical"
        android:visibility = "gone"
        android:background = "#80111111"
        android:padding = "0dp">

        <android.support.v7.widget.CardView
            android:id = "@+id/cardView"
            android:layout_width = "match_parent"
            android:layout_height = "wrap_content"
            android:layout_centerHorizontal = "true"
            android:layout_centerVertical = "true"
            android:layout_gravity = "center"
            android:background = "#fff"
            app:cardUseCompatPadding = "true"
            app:cardElevation = "10dp"
            app:cardCornerRadius = "0dp"
            ads:contentPadding = "10dp">

            <LinearLayout
                android:layout_width = "match_parent"
                android:layout_height = "wrap_content"
                android:orientation = "vertical">

                <TextView
                    android:layout_width = "match_parent"
                    android:layout_height = "wrap_content"
                    android:textAlignment = "center"
                    android:padding = "5dp"
                    android:text = "ARE YOU SURE TO EXIT?"
                    android:textColor = "#000"
                    android:textSize = "18dp"
                    android:textStyle = "bold" />

                <LinearLayout
                    android:layout_width = "match_parent"
                    android:layout_height = "wrap_content"
                    android:orientation = "horizontal"
                    android:paddingBottom = "0dp"
                    android:paddingLeft = "0dp"
                    android:paddingRight = "0dp"
                    android:paddingTop = "7dp">

                    <Button
                        android:id = "@+id/button_cancel"
                        android:drawableLeft = "@drawable/ic_back"
                        style = "@style/Widget.AppCompat.Button.Colored"
                        android:layout_width = "match_parent"
                        android:layout_height = "wrap_content"
                        android:padding = "18dp"
                        android:layout_marginRight = "7dp"
                        android:layout_weight = "1"
                        android:text = "Nope"
                        android:textColor = "#fff"
                        android:textSize = "14sp" />

                    <Button
                        android:id = "@+id/button_exit"
                        android:drawableRight = "@drawable/ic_arrow_forward"
                        style = "@style/Widget.AppCompat.Button.Colored"
                        android:layout_width = "match_parent"
                        android:layout_height = "wrap_content"
                        android:padding = "18dp"
                        android:layout_weight = "1"
                        android:text = "Yes"
                        android:textColor = "#fff"
                        android:textSize = "14sp" />

                </LinearLayout>
            </LinearLayout>
        </android.support.v7.widget.CardView>
    </RelativeLayout>
</RelativeLayout>