Im searching for a FOSS office suite for android that is not cloud based and that lets me both view, create, and edit documents so far the only thing that i found that meets all those requirements is collabora, BUT IS TRASH!, i literally cannot even scroll down without it glitching out and sending me to a whole different part of the document!
LibreOffice Viewer — The official LibreOffice viewer, available for Android. True, it mostly only has viewing and very basic editing. But it’s native and offline.
OnlyOffice (standalone version is optional) — There’s an Android app that can be used offline, with support for major formats (DOCX, XLSX, PPTX). Although the software is not fully FOSS, the client is open, the server can be stored. Collabora works better on mobile devices.
OpenDocument Reader/Editor — Less well known, but a simple ODT rider and editor, you can search for it in F-Droid. Very lightweight and offline.
AndrOpen Office — A port of Apache OpenOffice to Android, fully offline and FOSS. The interface is old-fashioned, but the functionality is decent.