iOS, Android, or both?

It could be that you only have an interest in iOS or only in Android. You should be able to easily see where to skip ahead to, unless you're intrigued about how the other half lives! If, like me, you're a capitalist, then you should be interested in both OSes.

Far fewer steps are needed to get the Android SDK than to get the iOS developer tools, because of having to sign up as a developer with Apple, but the configuration for Android is more involved. We'll go through all the steps for Android and then the ones for iOS. If you're an iOS-only kind of person, skip the next few pages, picking up again at the Becoming an iOS Developer section.