android - camera app

Hello, i have an app on itunes called Game Ranger. I would like to create an android version. I have also created a second version called golf ranger it is the same source code with different art dropped in. These apps use the iphone focal length to get the camera metering area and apply my equation to pixel height of an image to retrieve distance to the image values. Pre android os 2.3 code to retrieve camera focal length returns a null value. I would like to add a calibration screen for users who have devices that dont return a focal length (user takes two photos of a known heigth value at two known distances). All the math and images are done and i will share all the source code for the iphone version. Most all the leg work has been done! Thank you and i look forward to reasonable offers.