DandroidMobile has developed a great android app named DocsWork. DocsWork is the best viewer for Microsoft Word, Excel, Powerpoint and PDF. DocsWork is a great app for word processing, spreadsheets, presentations and pdf.
DocsWork supports a great number of file formats:
* LibreOffice file formats: ODT, ODS, ODP, OTT and ODM, which are used not only by LibreOffice but by OpenOffice.
* Microsoft Office formats: DOC, XLS, PPT, DOCX, XLSX and PPTX, which are used by the programs Microsoft Excel, Word and PowerPoint.
* Adobe reader format: PDF.
* Standard file text formats: TXT and RTF.
* Other formats like CWK, HTML, PDB, DXF, CSV, CDR, XML, EPS, GIF, PDF, BPN, JPG, SVG, WPD and XBM.
This app is available in the Google Play Store:https://play.google.com/store/apps/details?id=org.dandroidmobile.offiedit