Circular button with custom icon

circle.xml

<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="oval"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- border color and width -->
    <stroke android:width="0.5dp" android:color="@android:color/darker_gray"/>

    <!-- background color -->
    <solid android:color="@android:color/white"/>

</shape>

circular_button.xml

<ImageButton
  android:id="@+id/imageButton"
  android:layout_width="60dp"
  android:layout_height="60dp"
  android:background="@drawable/circle"
  app:srcCompat="[CUSTOM ICON]" />