Tiny Tiny RSS is a news feed reader using RSS and atom protocols.
TTRSS allows you to save your feeds in opml format. In order to do so, go to Actions -> Configuration -> feed tab -> OPML section -> Export/Import OPML.
You can read your feeds on Android using ttrss-reader application:
To use it, you need to go to Actions -> Configuration, in TTRSS web interface and select "Activate API". Then, in your android ttrss-reader, fill the TTRSS server adress: "https://yourdomain.org/ttrss", username, password (no need to use HTTP authentification).
Note : you may need to uninstall and reinstall the TTRSS application through the Yunohost admin panel in order to be able to connect.