android/app/src/main/res/layout/pdf_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/pdf_list_item"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="@dimen/pdf_list_vertical_margin"
    android:layout_marginLeft="@dimen/pdf_list_horizontal_margin"
    android:layout_marginRight="@dimen/pdf_list_horizontal_margin"
    android:layout_marginTop="@dimen/pdf_list_vertical_margin"
    android:scrollbars="vertical">

    <TextView
        android:id="@+id/pdf_list_item_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/pdf_list_item_vertical_margin"
        android:layout_marginLeft="@dimen/pdf_list_item_horizontal_margin"
        android:layout_marginRight="@dimen/pdf_list_item_horizontal_margin"
        android:layout_marginTop="@dimen/pdf_list_item_vertical_margin"/>

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