Ebook Reader is free, and optimized for Android devices.
One of the best document (Pdf, fb2, DJVU, etc.) viewer for Android.
EBook Reader allows you to customize the way you read on a per book basis: each document's layout can be tailored to give you the best reading experience and all settings will be remembered the next time you will open it.
EBook Reader supports the following ebook and document formats:
DjVU, PDF, XPS (OpenXPS), Fiction Book (fb2 and fb2.zip), Comics Book formats (cbr and cbz), plus - starting with version 2.0 - EPUB and RTF.

- Bookshelf view
- Recent Books
- Book search results
- File Browser,File navigation
- Search text in book
- Night Mode
- Auto fit your page view
- Links History, back to page
- Search all books (PDF, DjVu) on device
- Scroll pages by finger tap on screen
- Full screen mode
- Light theme and black theme
- Set screen orientation: Portrait, Landscape, Automatic
- Bookmarks on page
- Cut white document borders
- Fixate pages by width, page will not move from right to left
- Book and Page Thumbnails
- Configurable search directories
- Epub3 format support
- User-created collections for sorting your books
- Turn pages with a tap or swipe
- Landscape or portrait orientation is lockable
- Easy navigation inside the book
- Search for text inside books
- Night-reading mode is easy on the eyes
- Adjust font size with a tap
- 3rd-party (imported) book support
- Free classics at your fingertips immediately
- Shop for ebooks within the app

Disclaimer：
This app is base on EbookDroid code, and licensed under the GNU General Public License.
GNU General Public License: http://www.gnu.org/licenses/