android - 下载时我没有得到默认文件名

Question

我创建了一个 webview 应用程序，我在其中添加了下载器，下载以 m4a 结尾的文件。应用程序下载了文件，但文件名发生了变化……如何从文件中获取标题……

 public boolean shouldOverrideUrlLoading(WebView view, String url) {
       // handle different requests for different type of files
       // this example handles downloads requests for .m4a and .mp3 files
       // everything else the webview can handle normally
       if (url.endsWith(".m4a")) {
           Uri source = Uri.parse(url);
           // Make a new request pointing to the .apk url
           DownloadManager.Request request = new DownloadManager.Request(source);
           // appears the same in Notification bar while downloading
           request.setDescription("Description for the DownloadManager Bar");
           request.setTitle(getTitle());
           if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
               request.allowScanningByMediaScanner();
               request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
           }
           // save the file in the "Downloads" folder of SDCARD
           request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "filename");
           // get download service and enqueue file
           DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
           manager.enqueue(request);
       }
       else if(url.endsWith(".mp3")) {
           // if the link points to an .mp3 resource do something else
       }
       // if there is a link to anything else than .m4a or .mp3 load the URL in the webview
       else view.loadUrl(url);
       return true;                
     }
      });

Answer 1

这会给你你的文件名

final String[] separated = url.split("/");
final String myFile = separated[separated.length - 1];

它将使用/字符拆分 url，然后您获取返回数组中的最后一个元素。

数组是从 0 开始的，所以最后一个元素是位于向量长度 - 1 处的元素。

将上面的代码放在这一行之前:if (url.endsWith(".m4a")) {，您要获取文件名的位置。

然后，这样使用它:

request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, myFile);