<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="@android:color/transparent"
    android:padding="10dp">

    <DatePicker
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/date_picker"/>

</LinearLayout>