// `downloadFileListener` is used in `onAttach()` and `onCreateDialog()`.
private DownloadFileListener downloadFileListener;
// The public interface is used to send information back to the parent activity.
public interface DownloadFileListener {
// `downloadFileListener` is used in `onAttach()` and `onCreateDialog()`.
private DownloadFileListener downloadFileListener;
// The public interface is used to send information back to the parent activity.
public interface DownloadFileListener {