Android - How to create FAB programmatically?

Question

I have an app with full of custom views. When I try to create a FAB programmatically, it throws an error

Caused by: java.lang.IllegalArgumentExc

Answer 1

Fixed by using theme wrapper. But still I'm surprised about using ContextThemeWrapper

private FloatingActionButton getFAB() {
    Context context = new android.support.v7.internal.view.ContextThemeWrapper(getContext(), R.style.AppTheme);
    FloatingActionButton fab = new FloatingActionButton(context);
    return fab;
}