How to know android ViewCell.ContextActions show event?

How do I know if ContextActions appears on my Android device?

I would like to receive events that come from a Long Click item in a ListView.

Use the Clicked Event:

<ViewCell.ContextActions>
    <MenuItem
        Icon="chat.png"
        CommandParameter="{Binding .}"
        Text="Chat"
        Clicked="Handle_Chat_Tapped">
    </MenuItem>
</ViewCell.ContextActions>

Handle the event in code behind like this:

void Handle_Chat_Tapped(object sender, System.EventArgs e)
{
    var menuItem = sender as MenuItem;
    // whatever you want to do here
}

Read more about the topic in the Xamarin documentation: https://developer.xamarin.com/guides/xamarin-forms/user-interface/listview/interactivity/#Context_Actions