java - 如何通过 URL 从 firebase 数据库下载音频文件 mp3 或 mp4 或 mpeg

Question

在我的类适配器中，我有 ImageView，它必须根据扩展名 mp3、mp4-mpeg 下载歌曲。我的 firebase 数据库如下所示:

我不明白为什么下载没有开始这是方法:

private void musicdownload(String uri, String title){
    try {

        File musicStorageDir = new File(Environment.getExternalStoragePublicDirectory(DIRECTORY_MUSIC), "Gladia");

        if (!musicStorageDir.exists()){
            musicStorageDir.mkdir();

        }

        //Default Extension mp3
        String musicExtension = ".mp3";
        if (uri.contains(".mp4")){
            musicExtension = ".mp4";
        }else if (uri.contains(".aac")){
            musicExtension = ".aac";
        }else if (uri.contains(".mpeg")){
            musicExtension = ".mpeg";
        }

        String singName = title + musicExtension;

        DownloadManager downloadManager = (DownloadManager)mContext.getSystemService(Context.DOWNLOAD_SERVICE);
        Uri downloadUri = Uri.parse(uri);

        Log.d(TAG, "musicdownload: downloadUri: " + downloadUri);
        DownloadManager.Request request = new DownloadManager.Request(downloadUri);

        request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE)
                .setDestinationInExternalPublicDir(DIRECTORY_MUSIC + File.separator, singName)
                .setTitle(singName).setDescription(title)
                .setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

        downloadManager.enqueue(request);


    }catch (Exception e){
        e.printStackTrace();
    }
}

方法调用

    viewHolder.download.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            musicdownload(music.getMusicUrl(), music.getMusicTitle());
        }
    });

Answer 1

谢谢，我看到了问题。我没有激活授权。