public override void OnAttach(Activity activity)
{
base.OnAttach(activity);
try
{
menuButtonListener = (IMenuButtonListener)activity;
}
catch
{
throw new InvalidCastException(activity.ToString()
+ " must implement MenuButtonListner");
}
}
public void Add(IMenuButtonListener menuListener)
{
if (menuListener == null)
{
throw new ArgumentNullException("Menu listener can't be null");
}
var position = _menuListeners.FindIndex(item => item == menuListener);
if (position >= 0)
{
if (position < (_menuListeners.Count - 1))
{
_menuListeners.RemoveAt(position);
_menuListeners.Add(menuListener);
}
}
else
{
_menuListeners.Add(menuListener);
}
}
public void Remove(IMenuButtonListener obj)
{
_menuListeners.Remove(obj);
}
