Distantly login and extract javascript generated data from a website

I need to have a code that loges onto a website and extracts text data that is generated by javascript inside the site. Website is pretty old and it is made of combination of languages with javascript implementations. I need this code to be working on Android with API not higher than 21. Basically, what I want is: 1. Code that would login me and then extract information from the main page. 2. Also, I would ask for an explanation on how did you make it through. Data extracted should be just text data that can be converted into String object. Also, it should be working on Android (That is the main thing, HtmlUnit doesn't work on Android for some reason) Here is a website needed to be parced: [login to view URL] Javascript implementation begins when user loges in. I will give the login and password to view the website once project is accepted by a developer. Thank you, Dmitry I also attached some screenshots to show how website looks and what is needed to be extracted.