Integrating datepicker etc into TabWidget

I have done the android tutorial on datepicker, timepicker, formstuff and tabwidget and I was thinking, is there any way I can get the datepicker, timepicker and formstuff to work when I integrate it into the tabwidget?

Pardon me but I am new to Android Applications and my knowledge on Java is as little as it gets. I'm trying Android out because I am doing a project on this. But having been a pro in php, I was wondering if there is some sort of a 'call' function in Java like php whereby you can call a function that is found on another page.