What pre-requisite knowledge is required for developing android apps, Iphone etc?

I am looking forward to start a mobile application development business and wish a to have direct knowledge of the technologies that run behind the cool apps. Being new to the programming / development world...pls suggest if it is better to 开发者_如何学Pythonlearn .Net or Java before learning about Android SDK, iOS SDK etc?

well if your goal is android development you should learn java. if you want to do windows phone 7 .net would be the way to go.