(Free) PGN Reader for Android?

Hi all,
usually I read my pgn files on my laptop but I need a PGN reader for my tablet. I'd like to have something free because I will not use it so often, just from time to time when I'm travelling.
Any suggestion?
Thanks

Chess.com's website works well with a browser app.

It can read and analyze pgn files.

Thank you, it works with books too? 
Thanks again

No. PGN's are just for games. They are just text files listing the moves in algebraic notation and a few details about the game location, players, etc.

It sounds like you want help reading PDF's of older out of copyright chess books that may have been copied to PDF.

Chess.com won't help you to automatically read those books and post diagrams.