A useful binding adapter that stretch the views boundaries to draw behind the system bar insets (aka going edge-to-edge)

setDecorFitSystemWindow.kt

/**
 *     example:
 *
 *     <!--parent container (that's expanded to fullscreen)-->
 *     <androidx.constraintlayout.widget.ConstraintLayout
 *         android:layout_width="match_parent"
 *         android:layout_height="match_parent"
 *         ...
 *         app:setDecorFitSystemWindow="@{true}">
 *         ...
 *         ...
 *         ...
 *     </androidx.constraintlayout.widget.ConstraintLayout>
 */

@BindingAdapter("app:setDecorFitSystemWindow")
fun setDecorFitSystemWindow(view: View, apply: Boolean) {
    if (!apply) return
    if (view.context is Activity) {
        WindowCompat.setDecorFitsSystemWindows((view.context as Activity).window, false)
    }
}