pub Reader is a beautiful application for android just download this app and enjoy.
It can help you to easily manage and open almost any e-book format:
offline in PDF EPUB WORD (DOC DOCX RTF) MOBI FB2 DJVU TXT and CHM formats.
This book reader makes your Android phone become an ePub reader. It manages the .epub files you imported from SD card or downloaded from web sites
Key features:

Pages or scroll view. Page flipping animation.
* Table of contents bookmarks text search.
Can read books from zip archives.
* Automatic reformatting of .txt files (autodetect headings etc.)
* Styles can be customised in wide range using external CSS.
* Select text using double tap (optional).
Adjust your screen brightness
• Choose of reading mode: scroll continuously or flipping in book pages
• Organize your library any way you like
• Search for many free books in OPDS Catalogs
• Listen to books that are read out loud to you with Text To Speach (TTS Speech synthesizer)
• Browse the books in the built-in File Manager
• Organize books in Favorite list tags collections
• Fonts Font color Background font size margins line spacing hyphenation hyphenation language skip author style options
• Brightness control (swipe up to down to adjust)
• Rotation lock left-right movement lock
✔ Search for EPUB FB2 PDF etc. documents and create a library
✔ Add and remove folders
✔ Filtered book search: by title author series genre
• Bookmarks (possibility export as text to email)
• Double(two) pages half page or one page on the screen.
• Opening books from external applications and browser
✔ Modern reading design
✔ Change theme and accent colors
✔ Night or daytime theme (Substratum friendly)
✔ Change the size and look of book covers
✔ Library search
Best book manager for your library
Auto-detection of books and documents. For example just download an Epub book PDF journal Word documents or PDF article from the Internet so they appear in the reader for reading. Easy navigation through folders and downloads. Grouping books by authors and series. Book reading lists: To Read Have Read Favorites. Sorting by name file format the last time read etc.
Disclaimer：
This app is based on Cool Reader code and licensed under the GNU General Public License.
Cool Reader: https://gitlab.com/axet/android-book-reader
GNU General Public License: http://www.gnu.org/licenses/