Consuming RestFul service using okhttp in Android Fragment

I am developing an application that has 3 fragments that consume RESTFUL services each. I set static data first for all the 3 tabs for sample view and calling RESTFUL service in only the 2nd tab. I used okhttp to consume the service and fetch the data. I was able to get the JSON response < Parse it < set data to my textviews and displaying through recycler view. My issues are :

RESTFUL

okhttp

JSON

Recyclerview

onfailure

onresponse

MainActivityAdapter

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