Including Route Optimization API in Android App

Hello,

I’d like to use the Route Optimization API in my Android App.
Especially I’d like to use this Code: https://github.com/graphhopper/directions-api-java-client/blob/master/client-examples/src/main/java/com/graphhopper/directions/api/examples/TSP_BiggestCitiesInGermanyExample.java

Did anyone write this code as AsyncTask?
Or does anyone have an other AsyncTask for Route Optimization.

Code Examples are welcome!

Greets
Julian