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virtual_login_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin">

<com.example.android.autofillframework.app.InfoButton
        android:id="@+id/imageButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/ic_info_black_24dp"
        app:layout_constraintBottom_toBottomOf="@+id/custom_virtual_login_header"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/custom_virtual_login_header"
        app:layout_constraintTop_toTopOf="@+id/custom_virtual_login_header"
        app:dialogText="@string/custom_virtual_login_info"/>

<com.example.android.autofillframework.app.CustomVirtualView
        android:id="@+id/custom_view"
        android:layout_width="match_parent"
        android:layout_height="@dimen/custom_view_height"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/custom_virtual_login_header" />