Developing App to display PDF

Hey there,

I'm working on an App that downloads a password protected PDF and displays it then. As IDE i use Android Studio and in Android developing I'm new but i got some experience in Delphi and C.
The Webserver requires username and password for the pdf, how can i download it from the app within? And how to display a PDF in generally?

Any tips/hints welcome ;D

LG Christopher

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