What you are seeing here is an Android app that shows a local html file inside a Web View.
Then on top of the web view there is a button to save web view contents as a pdf file.
Pdf file is saved localy after you tapped the button and you can open it using your favorite pdf viewer app in your phone.
The source code of this simple android app is available for free in the link below.
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Here is the download link, man! Go ahead grab it: https://drive.google.com/open?id=1E4XwLGnYQExUSA1trKGvUStPtZGZKVQd