How consume ibm lotus notes to android studio interface?

Question

I am developing an android mobile application with android studio v3.0. This app aims on the one hand to communicate with ibm lotus notes v8.5(authentification with ibm lotus). On the other hand to use the documents of lotus notes in my interfaces ie to extract information needed from already existing ibm documents and to display them through an android interface. Then to send information of my interface to the documents of ibm lotus notes.I made several search I find it necessary to use web service such as JSON, REST, SOAP ... but until now I find no solution or a guide that can help me.