java - 无法访问 Android 中下载的文件

Question

因此，我使用以下代码从提供的 URL 下载 .mp3 歌曲:

private long DownloadData (Uri uri) {

    long downloadReference;

    // Create request for android download manager
    downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
    DownloadManager.Request request = new DownloadManager.Request(uri);

    request.setTitle("Data Download");
    request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | 
            DownloadManager.Request.NETWORK_MOBILE);
    request.setDescription("Android Data download using DownloadManager.");
    request.setDestinationInExternalFilesDir(DownloadSongActivity.this, 
            Environment.DIRECTORY_DOWNLOADS ,"doesn'twork.mp3");

    downloadReference = downloadManager.enqueue(request);

    return downloadReference;
}

然后，我尝试使用以下代码让用户访问应用程序中的这些文件

File path = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath());
    File[] downloadedFiles = path.listFiles();


    if(downloadedFiles == null){
        System.out.println("DownloadedFiles are null");
    } else if(downloadedFiles.length == 0){
        System.out.println("DownloadedFiles are empty");
    } else{
        System.out.println("DownloadedFiles are not empty");
    }

但是，downloadFiles 似乎始终为空。有什么建议。以下是一些图片供引用

如果我转到"file"->“下载”

Image Reference link

Answer 1

Try this, it is definitely working