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Perhaps you're looking for this one?
Here are several different options for different platforms and levels of coding experience. There are pros and cons to each - if you're not sure which one would work best for you, just ask!
Building your first Android AppOfficial tutorial from Android - recommended for coders with some experience.
Android Development VideosIf learning from videos rather than written tutorials is your style, check out Android Development for Absolute Beginners!
App Development with SwiftLong and intense course through Apple Education. Not for the faint of heart.