open-keychain/OpenKeychain/src/main/res/layout/nfc_activity.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
    android:paddingBottom="16dp">

    <TextView
        android:text="@string/nfc_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="@android:style/TextAppearance.Large"
        android:id="@+id/nfc_text"
        android:gravity="center"
        android:layout_gravity="center" />

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/yubikey_phone" />

</LinearLayout>