The key benefit of Delphi and C++Builder is to be able to create your app once, and from the very same source code, natively compile it for different operating systems. In this book, we are focusing on mobile operating systems, namely Android and iOS. Every system is different and has different concepts that might not exist elsewhere. A good example of something unique to a particular platform are Android services. This notion exists on Android only and as such it cannot be ported to iOS or other operating systems.
Delphi has a special project type and the IDE wizard for creating an Android service. It is also possible to use an Android service, created with Delphi or not, in a regular multi-device project, but only if it is targeting Android.
Services are intended to be used by different apps, so the same functionality does not need to...