写一段android 下载文件流到本地并于下载完成打开文件所在路径的文件夹的代码

好的，以下是一段参考代码：

public void downloadFile(String url, String fileName) {
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
    request.setTitle(fileName);
    request.setDescription("Downloading " + fileName);
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);

    DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
    long downloadId = downloadManager.enqueue(request);

    BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
                DownloadManager.Query query = new DownloadManager.Query();
                query.setFilterById(downloadId);

                Cursor cursor = downloadManager.query(query);
                if (cursor.moveToFirst()) {
                    int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
                    int status = cursor.getInt(columnIndex);
                    if (status == DownloadManager.STATUS_SUCCESSFUL) {
                        String fileUri = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
                        openFile(fileUri);
                    }
                }
                cursor.close();
            }
        }
    };

    registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}

private void openFile(String fileUri) {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.parse(fileUri), "application/*");
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(Intent.createChooser(intent, "Open File"));
}

这段代码使用了 Android 的 DownloadManager 下载文件，然后在下载完成后通过 BroadcastReceiver 打开文件所在路径的文件夹。注意需要在 AndroidManifest.xml 文件中添加文件读写权限和下载权限。