我正在使用下载管理器类下载 Mp3 文件。
DownloadManager downloadManager = (DownloadManager)getSystemService(Context.DOWNLOAD_SERVICE);
//dls is an arraylist that holds the download links
Uri uri=Uri.parse(dls.get(0));
DownloadManager.Request request= new DownloadManager.Request(uri);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"file.mp3");
downloadManager.enqueue(request);
该setDestinationInExternalPublicDir
方法需要第二个参数来更改下载文件的名称。
我希望文件具有其默认名称。如果我不使用该方法,该文件将具有其默认名称,但它不会位于下载目录中。
我怎样才能实现这两个目标,在下载目录中找到文件并保留文件名?
感谢帮助。
你能试试这个吗:
public static String getFileNameFromURL(String url) {
if (url == null) {
return "";
}
try {
URL resource = new URL(url);
String host = resource.getHost();
if (host.length() > 0 && url.endsWith(host)) {
// handle ...example.com
return "";
}
}
catch(MalformedURLException e) {
return "";
}
int startIndex = url.lastIndexOf('/') + 1;
int length = url.length();
// find end index for ?
int lastQMPos = url.lastIndexOf('?');
if (lastQMPos == -1) {
lastQMPos = length;
}
// find end index for #
int lastHashPos = url.lastIndexOf('#');
if (lastHashPos == -1) {
lastHashPos = length;
}
// calculate the end index
int endIndex = Math.min(lastQMPos, lastHashPos);
return url.substring(startIndex, endIndex);
}
此方法可以处理以下类型的输入:
Input: "null" Output: ""
Input: "" Output: ""
Input: "file:///home/user/test.html" Output: "test.html"
Input: "file:///home/user/test.html?id=902" Output: "test.html"
Input: "file:///home/user/test.html#footer" Output: "test.html"
Input: "http://example.com" Output: ""
Input: "http://www.example.com" Output: ""
Input: "http://www.example.txt" Output: ""
Input: "http://example.com/" Output: ""
Input: "http://example.com/a/b/c/test.html" Output: "test.html"
Input: "http://example.com/a/b/c/test.html?param=value" Output: "test.html"
Input: "http://example.com/a/b/c/test.html#anchor" Output: "test.html"
Input: "http://example.com/a/b/c/test.html#anchor?param=value" Output: "test.html"
你可以在这里找到完整的源代码:https : //ideone.com/uFWxTL
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句