private static View findProperTarget(final View view) {
	if (! (view instanceof Toolbar)) return view;
	final ViewGroup group = (ViewGroup) view;
	for (int i = 0; i < group.getChildCount(); i ++) {
		final View child = group.getChildAt(i);
		if (child instanceof ActionMenuView) return ((ActionMenuView) child).getChildAt(0);	// ActionMenuItemView
	}
	return view;
}
 

private void processMenuView(ViewGroup viewGroup) {
    for (int i = 0; i < viewGroup.getChildCount(); i++) {
        View child = viewGroup.getChildAt(i);

        try {
            if (child instanceof ActionMenuView) {
                processActionMenuView((ActionMenuView) child);
            } else if (child instanceof android.support.v7.widget.ActionMenuView) {
                processSupportActionMenuView((android.support.v7.widget.ActionMenuView) child);
            }
        } catch (NoClassDefFoundError e) {
            // not a error com.android.support:appcompat-v7 is not used in project
        }
    }
}
 

@BindingAdapter("menu") public static void inflateMenu(final ActionMenuView amv, final @MenuRes int old_menu, final @MenuRes int new_menu) {
	if (SDK_INT < LOLLIPOP) return;
	if (new_menu == old_menu) return;
	final Menu menu = amv.getMenu();
	menu.clear();
	new MenuInflater(amv.getContext()).inflate(new_menu, menu);
}
 

private void processSupportActionMenuView(android.support.v7.widget.ActionMenuView menuView) {
    Menu menu = menuView.getMenu();
    processMenu(menu);
}
 

@TargetApi(21)
private void processActionMenuView(ActionMenuView menuView) {
    Menu menu = menuView.getMenu();
    processMenu(menu);
}