How to create library that handle flow?

I'm new on the android develop. I need to write some application that contain 8 kind of flow. For example

flow 1 need to deal with GPS - and return some information about analyzing GPS signal
flow 2 need to deal with network - and return some information about analyzing the network signal

i want to write my application in a way that each flow will appear on different project / library
(i'm a c#/C++ developer .. so in C#/C++ its call a dll ( dynamic library ) and its very easy to re-use the library in different projects )

How to do it on android platform ?
( i using android studio IDE )