java - 从 URL 下载 pdf 文件并将其保存在 android (java) 中的特定文件夹中

Question

我想从给定的 URL 下载 pdf 文件并将其保存在特定文件夹中。到目前为止，我可以下载所需的文件并存储在“下载”文件夹中，我也可以创建自定义目录“AldoFiles”，但我无法将文件存储在自定义目录中。

这是我的尝试:

 private void downloadPdf() {

        try {
            url = new URL(pdfURL);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
        {
            requestPermissions(new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE},RequestCode);
        }

        File direct = new File(Environment.getExternalStorageDirectory() + "/Download/AldoFiles");

        if (!direct.exists()) {
            File pdfDirectory = new File("/sdcard/Download/AldoFiles/");
            pdfDirectory.mkdirs();
        }

        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url + ""));
        request.setTitle(fileName);
        request.setMimeType("application/pdf");
        request.allowScanningByMediaScanner();
        request.setAllowedOverMetered(true);
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,fileName);
        DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        downloadManager.enqueue(request);

    }

Answer 1

感谢@blackapps 我解决了这个问题:

try {
    url = new URL(bookURL);
} catch (MalformedURLException e) {
    e.printStackTrace();
}

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url + ""));
request.setTitle(fileName);
request.setMimeType("application/pdf");
request.allowScanningByMediaScanner();
request.setAllowedOverMetered(true);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "AldoFiles/" + fileName);
DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
downloadManager.enqueue(request);