使用DownloadManager设置下载文件的名称

Question

我正在使用android应用程序，其中使用DownloadManager类下载文件。

问题

我在DownloadManager.Request类的setDestinationInExternalPublicDir方法中传递要赋予下载文件的名称，而不是该名称，下载的文件将我在DownloadManager.Request类的setTitle方法中传递的String作为其名称。

仅当我将DownloadManager的通知的可见性设置为true ，才会出现此问题，否则下载的文件将采用我在setDestinationInExternalPublicDir方法中传递的名称。

题

为什么会发生这种情况，如何设置下载文件的名称？

码

DownloadManager.Request downloadRequest = new DownloadManager.Request(uri);

downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
downloadRequest.setTitle(currentApp.getAppNameEng());

downloadRequest.setDestinationInExternalPublicDir(
      Environment.DIRECTORY_DOWNLOADS,
      currentApp.getAppNameEng() + ".apk"
);

final DownloadManager downloadManager =
                (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
downloadID = downloadManager.enqueue(downloadRequest);

Answer 1

使用此方法可以正常工作：_

在此下载路径中，是图像或视频URL，另一个isImage参数是图像发送true和视频发送false。

私人void downLoadImageVideo（String downloadPath，Boolean isImage）{

    Uri Download_Uri = Uri.parse(downloadPath);

    DownloadManager downloadmanager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

    DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
    request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
    request.setAllowedOverRoaming(false);
    request.setTitle(getString(R.string.app_name));
    request.setDescription(getString(R.string.downloading));
    request.setVisibleInDownloadsUi(true);
    String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(downloadPath));
    request.setMimeType(mimeType);

    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
    if (isImage) {
        request.setDestinationInExternalPublicDir("/AppName", "IMG_" + timeStamp + ".jpg");
    } else {
        request.setDestinationInExternalPublicDir("/AppName", "VID_" + timeStamp + ".mp4");
    }


    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    downloadmanager.enqueue(request);
}