customfieldviews/src/main/res/layout/custom_form_button.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="55dp"
android:layout_height="55dp"
android:background="@drawable/border_background_light"
>
<ImageView
android:id="@+id/custom_form_button.button_icon"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_centerInParent="true"
android:src="@drawable/ic_chevron_down_dropdown"
tools:ignore="ContentDescription"
/>
</RelativeLayout>