NetGuard/app/src/main/res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingEnd="@dimen/activity_horizontal_margin"
    android:paddingStart="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".ActivityMain">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rvApplication"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbarStyle="outsideInset"
        android:scrollbars="vertical" />
</LinearLayout>