public override bool OnOptionsItemSelected(IMenuItem item)
{
if (item.ItemId == Resource.Id.sample_action)
{
ToggleLogin();
item.SetTitle(mLoggedIn ? Resource.String.log_out : Resource.String.log_in);
// Notify the system that the status of our roots has changed. This will trigger
// a call to MyCloudProvider.queryRoots() and force a refresh of the system
// picker UI. It's important to call this or stale results may persist.
Activity.ContentResolver.NotifyChange(DocumentsContract.BuildRootsUri(AUTHORITY), null, false);
}
return(true);
}