Action Mode Callback example to create a contextual menu for an Action Bar in M4A

MessageAction

private class MessageAction: Java.Lang.Object, ActionMode.ICallback
{
	string _title;
	string _subTitle;
	
	public event EventHandler<EventArgs> DeleteActionHandler;
	public event EventHandler<EventArgs> ViewActionHandler;
	public event EventHandler<EventArgs> DestroyActionHandler;
	
	public MessageAction (string title, string subTitle)
	{
		_title = title;
		_subTitle = subTitle;
	}
	
	bool ActionMode.ICallback.OnActionItemClicked (ActionMode mode, IMenuItem item)
	{
		switch (item.ItemId)
		{
			case Resource.Id.deleteMessage:
				if (DeleteActionHandler != null)
					DeleteActionHandler (null, null);
				return true;
			case Resource.Id.viewMessage:
				if (ViewActionHandler != null)
					ViewActionHandler(null, null);
				return true;
			default:
				return false;
		}
	}

	bool ActionMode.ICallback.OnCreateActionMode (ActionMode mode, IMenu menu)
	{
		mode.Title = _title;
		mode.Subtitle = _subTitle;
		mode.MenuInflater.Inflate (Resource.Menu.message_action_bar, menu);
		return true;
	}

	void ActionMode.ICallback.OnDestroyActionMode (ActionMode mode)
	{
		if (DestroyActionHandler != null)
			DestroyActionHandler(null, null);
	}

	bool ActionMode.ICallback.OnPrepareActionMode (ActionMode mode, IMenu menu)
	{
		return false;
	}
}