That's part of the problem. There is diversity in the Android ecosystem. Android hardware and software differ among models and versions. There isn't necessarily

That's part of the problem. There is diversity in the Android ecosystem. Android hardware and software differ among models and versions. There isn't necessarily a common way of doing things. Some might argue that the iOS' "one-way-to-do-things" design guidelines are constraining and limit innovation, but in practice they are very well thought out.