pick a photo with the device camera

Hi, i need a solution for this problem, i have to click a button, then the app open the device camera software, take a shoot and save it in my app. there's a good plug-in or method for do that? i was looking around and i found prime31 plug-in, but it is expensive, don't support cross-platform and i read about some compatibility issues with a lot a of device, i'm lookin for something to more stable. thank you and sorry for my english.