How to get and set (change) ID3 tag (metadata) of audio files?

Question

I am working to change ID3 tags, the metadata in audio files, such as:

• Artist
• Title
• Album
• etc.

And the core point,

Answer 1

And most important point is that the edited ID3 tags were shown only into the my app.

If you edit the file then anybody will see that. You can create your own database of mediafiles (like Android's database) and just store the modified data there.