See how to create an example web service in Android. Page 174,  Chapter 6 Getting Started with Android – Alternative Formats
See how to create an example web service in iOS. Page 214,  Chapter 7 Getting Started with iOS – Alternative Formats
For submission : Read carefully about 2 different approaches for creating a web service from above. Then
(a) compare the two approaches and
(b) explain 2 advantages of each approach relative to the other.