Android Service With Notification

I have one android application in i have to create a service that run 24 hours a day it also use xml parsing based on that data it gives 开发者_Python百科notification on the particular time?

How can I do this?

---

Look at the Service samples of the Service SDK. What you want to do is very well documented.

http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/index.html