class TrackFile {

    @NonNull
    public String getSize() {
        if (!file.exists()) {
            Log.e(TAG, "Missing file in TrackFile.getSize()");
        } else if (file.length() == 0) {
            Log.e(TAG, "Zero length file in TrackFile.getSize()");
        }
        final long size = file.length() >> 10;
        return size + " kb";
    }

    public  TrackFile(File file);

}