How to check if file already exists ? about fetch HOT 1 CLOSED

fetch.addFetchListener(new FetchListener() {
    @Override
    public void onUpdate(long id, int status, int progress, int error) {

        if(id == downloadId && status == Fetch.STATUS_DONE) {
            //download is now completed.
        }
    }
 });

//example 1

RequestInfo requestInfo = fetch.get(downloadId);

if(requestInfo != null && requestInfo.getStatus() == Fetch.STATUS_DONE) {
    //download is complete.
}

//example 2

File file = fetch.getDownloadedFile(downloadId);

if(file != null) {
    //download is complete.
}