如何使用对话框删除我的联系人？

What I'm trying here is I want to long press the number that I select and it will pop-up an alert dialog that ask me to delete. If I press Ok it will be deleted. I'm new here, I'm new in android I just want it know if it's possible to do that. If yes, where do I start. Can you show me a sample code?What I'm trying here is I want to long press th