Capturing signatures Android

Hey guys

I need to build a little form application for android. The trickiest part is that the client must be able to sign on the screen of the device. It will be running on only resistive touch screens so a stylus will be used. I was just wondering if anyone has done something similar before and have maybe have a few tutorials or resources. I have found a few tutorials which are quite complex, so I am just trying to find the best way of doing this. As it must also be saved to an image and put into a pdf document.

Oh yes, this will be a native application written in java. Not a mobile web application.

Thanks for any suggestions.