Software →N Docs - Office, Pdf, Text, Markup, Ebook Reader v5.4.0

Support file types:
* Microsoft Word (DOC/DOCX, don't support password protected file)
* Microsoft Excel (XLS/XLSX, don't support password protected file)
* Microsoft PowerPoint (PPT/PPTX, don't support password protected file)
* Open/Libre Writer (ODT, Open with thirdparty app)
* Open/Libre Calc (ODS, Open with thirdparty app)
* Open/Libre Impress (ODP, Open with thirdparty app)
* Hancom Hanword (Open with thirdparty app)
* Hancom Hancell (Open with thirdparty app)
* Hancom Hanshow (Open with thirdparty app)
* Portable Document Format (PDF, support password protected file)
* RTF
* TXT
* MARKUP(MD/HTML/XHTML/XML/DTD/XSL/XSLT)
* CODE(JAVA/CPP/PHP)
* EBOOK(EPUB)
Create file types:
* PDF
* TXT
* HTML
Edit file types:
* TXT
* MARKUP(MD/HTML/XHTML/XML/DTD/XSL/XSLT)
* CODE(JAVA/CPP/PHP)
Document Search:
* Support all of file types, except PDF.
* PDF will be supported.
Storage services:
* Google Drive
* Microsoft One Drive
* Box
Requirements: Android 7.0+
Home Page -

https://play.google.com/store/apps/details?id=net.sjava.docs&hl=en