The app is designed specially for playing audio books.
Assumed that you have audiobooks and already copied them to your phone.
First 30 days Full version. Later - Basic version.
Features:
+ Chromecast support.
+ Playback speed control.
+ Classification of books (new, started, finished).
+ Download cover from the Internet.
+ List of characters. You can manually create a list of characters to easier follow the story.
+ Automatic pause in case you fall asleep. To continue playback just shake your phone.
+ Playback history.
+ Application Widget. Allows you to control the player from the home screen.
+ By specifying a root folder containing all your audiobook, you can exclude your folders which contains music and other audio files.
+ You don't have to finish one book to start another. The progress is saved independently for all books.
+ NO ADS!

To purchase (restore after reinstalling) full version press:
menu--Help--Version tab
Phone must be connected to the Internet.
Full version cost is $2.

Many thanks to people who left comments and suggestions.
If you have something that doesn't work please write an email instead of leaving a comment.

Version for Android 4.4 - 5.1:
drive.google.com/file/d/159WJmKi_t9vx8er0lzTGtQTfB7Aagw2o

Version for Android 4.1 - 4.3:
drive.google.com/file/d/1QtMJF64iQQcybkUTndicuSOoHbpUUS-f/view?usp=sharing

Version with old icon:
drive.google.com/open?id=1lDjGmqhgSB3qFsLR7oCxweHjnOLLERRZ

From version Smart AudioBook Player 9.2.8:

+ Fixed background color banding on some phones.
+ Increased cover quality in the app widget.

++ Android 13 improvements:
+ Updated app notification. Sorry, there is no way to show custom notifications anymore.
+ Android Auto: Previous file and Next file button icons are replaced with Rewind and Fast forward icons (behavior wasn't changed).
+ Added monochrome launcher icon.
+ The app language can be chosen independently from system language:
Settings-> Apps-> Smart AudioBook Player-> Language

Variant
Arch
Version
DPI
All versions
Smart AudioBook Player 9.2.8

Version:9.2.8

Uploaded:June 29, 2022 at 7:22PM UTC

File size:8.48 MB

Downloads:23

Smart AudioBook Player 9.2.4

Version:9.2.4

Uploaded:June 18, 2022 at 8:43AM UTC

File size:8.48 MB

Downloads:46

Smart AudioBook Player 9.2.2

Version:9.2.2

Uploaded:June 11, 2022 at 6:33AM UTC

File size:8.48 MB

Downloads:19

Smart AudioBook Player 9.2.1

Version:9.2.1

Uploaded:June 9, 2022 at 9:26PM UTC

File size:8.48 MB

Downloads:35

Smart AudioBook Player 9.1.7

Version:9.1.7

Uploaded:May 30, 2022 at 5:52PM UTC

File size:8.47 MB

Downloads:44

Smart AudioBook Player 9.1.5

Version:9.1.5

Uploaded:May 23, 2022 at 7:42AM UTC

File size:8.46 MB

Downloads:33

Smart AudioBook Player 9.1.2

Version:9.1.2

Uploaded:May 21, 2022 at 8:26PM UTC

File size:8.46 MB

Downloads:23

Smart AudioBook Player 9.1.1

Version:9.1.1

Uploaded:May 19, 2022 at 3:26AM UTC

File size:8.45 MB

Downloads:19

Smart AudioBook Player 9.1.0

Version:9.1.0

Uploaded:May 16, 2022 at 7:17PM UTC

File size:8.45 MB

Downloads:28

Smart AudioBook Player 9.0.7

Version:9.0.7

Uploaded:May 14, 2022 at 10:17AM UTC

File size:8.45 MB

Downloads:23