android - Hide/unhide toolbar menu -

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i want can able hide/unhide programmatically toolbar menu.

because couldn't find information on net use next code remove menu toolbar:

toolbar mtoolbar = (toolbar) findviewbyid(r.id.toolbar); mtoolbar.getmenu().clear();

how can put programmatically?

i figure out next code hide menu:

 toolbar mtoolbar = (toolbar) findviewbyid(r.id.toolbar);  mtoolbar.getmenu().clear();

and next unhide:

toolbar mtoolbar = (toolbar) findviewbyid(r.id.toolbar); if (!mtoolbar.getmenu().hasvisibleitems()) {     getmenuinflater().inflate(r.menu.menu_activity, mtoolbar.getmenu()); }

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