MaterialThemeOverlay

Utility to apply a theme overlay to any android.content.Context. The theme overlay is read from an attribute in the style. This is useful to override theme attributes only for the specific view.

The intended use is in a custom view constructor.

public MyCustomView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(wrap(context, attrs, defStyleAttr, DEF_STYLE_RES), attrs, defStyleAttr);
}