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

Actually, FasteKerinns's code is quite good. You should just change

new MyID3().write(src, dst, src_set, meta);

to

new MyID3().update(src, src_set, meta);

which means you don't need dst variable at all.

Additionaly, I have this piece of code which refreshes song that is modified in MediaStore:

 scanner=new MediaScannerConnection(getApplicationContext(),  
            new MediaScannerConnectionClient() {    

      public void onScanCompleted(String path, Uri uri) {
              scanner.disconnect(); 
      }

      public void onMediaScannerConnected() {
              scanner.scanFile(path, "audio/*");    
      }
  });

  scanner.connect();

I think this is what you are looking for MyID3 library to set and get tags for media file.

Download this jar file MyID3_for_android and add it to your project's build path. here is the sample code. here pathdata is the file path of the audio file.

            File src = new File(pathdata);
            MusicMetadataSet src_set = null;
            try {
                src_set = new MyID3().read(src);
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            } // read metadata

            if (src_set == null) // perhaps no metadata
            {
                Log.i("NULL", "NULL");
            }
            else
            {
                try{
                    IMusicMetadata metadata = src_set.getSimplified();
                    String artist = metadata.getArtist();  
                    String album = metadata.getAlbum();  
                    String song_title = metadata.getSongTitle(); 
                    Number track_number = metadata.getTrackNumber(); 
                    Log.i("artist", artist);
                    Log.i("album", album);
                }catch (Exception e) {
                    e.printStackTrace();
                }
                File dst = new File(pathdata);
                MusicMetadata meta = new MusicMetadata("name");
                meta.setAlbum("Chirag");
                meta.setArtist("CS");
                try {
                    new MyID3().write(src, dst, src_set, meta);
                } catch (UnsupportedEncodingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (ID3WriteException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }  // write updated metadata
            }

Happy Coding :)