class DownloadListener1 implements DownloadListener,
        Listener1Assist.Listener1Callback, ListenerAssist {

    @Override
    public void fetchProgress(@NonNull DownloadTask task, int blockIndex, long increaseBytes) {
        assist.fetchProgress(task, increaseBytes);
    }

      DownloadListener1(Listener1Assist assist);
    public  DownloadListener1();

}