Find out File be download in android
<p>I download file by this code:</p>

<pre><code>manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);   String url = json_string_4_all[0];
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
id = manager.enqueue(request);
request.setDescription("درصد دانلود ");
request.setTitle("دانلود کتاب " + json_string_1_all[0]);

if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) {
    request.allowScanningByMediaScanner();
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}

request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, json_string_1_all[0] + ".pdf");manager.enqueue(request);
</code></pre>

<p>Now i want do something after it downloaded (finished).</p>

<p>How can  i do that?</p>