Android : List of Mp3 files from a specific folder - Android

How i get list of all Mp3 files from a specific folder?

My folder is

 FILE_PATH = Environment.getExternalStorageDirectory().getPath() + "/my folder/"

This following code show all mp3 from all Folder .. i want sow mp3 from my folder only

 Cursor createCursor(String filter) {
    ArrayList<String> args = new ArrayList<String>();
    String selection;

    if (mShowAll) {
        selection = "(_DATA LIKE ?)";
        args.add("%");
    } else {
        selection = "(";
        for (String extension : CheapSoundFile.getSupportedExtensions()) {
            args.add("%." + extension);
            if (selection.length() > 1) {
                selection += " OR ";
            }
            selection += "(_DATA LIKE ?)";
            selection  = selection  + "AND (IS_MUSIC=1)";
        }
        selection += ")";

        selection = "(" + selection + ") AND (_DATA NOT LIKE ?)";
        args.add("%espeak-data/scratch%");
    }

    if (filter != null && filter.length() > 0) {
        filter = "%" + filter + "%";
        selection =
            "(" + selection + " AND " +
            "((TITLE LIKE ?) OR (ARTIST LIKE ?) OR (ALBUM LIKE ?)))";
        args.add(filter);
        args.add(filter);
        args.add(filter);
    }