class DownloadListener4 implements DownloadListener,
        Listener4Assist.Listener4Callback, ListenerAssist {

    @Override public final void downloadFromBeginning(@NonNull DownloadTask task,
                                                      @NonNull BreakpointInfo info,
                                                      @NonNull ResumeFailedCause cause) {
        assist.infoReady(task, info, false);
    }

      DownloadListener4(Listener4Assist assist);
    public  DownloadListener4();

}