Thank you sir . I had one more thing to ask 
The app is using timusus' KtagLib  for tagger in which the song's artwork is not getting updated .
Then I saw another library for audio metatagging in which I have seen some classes that deals with images as well 
the github repository is : https://github.com/Kaned1as/jaudiotagger
the section is : https://github.com/Kaned1as/jaudiotagger/tree/master/src/org/jaudiotagger/tag/images
I was wondering if it could be of any help