Android: how to get file size before download?

Question

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How to know the size of a file before downloading it?

I must download some pdf in my app.

I need to have the filesize before start to download, to show a progress bar, or to notify the user with the standard 'downloading .. ' notification

How to get a file size having a new Url('http://mysite.net//mypdf.pdf') ?

Your question has been already answered http://stackoverflow.com/questions/2983073/how-to-know-the-size-of-a-file-before-downloading-it — Marcin S., Sep 04 '12 at 21:19
@Niek You get the content length header and hope it's correct. — Dave Newton, Sep 04 '12 at 21:22

score 5 · Accepted Answer · answered Sep 04 '12 at 21:24

5

final URLConnection connection = url.openConnection();
final int length = connection.getContentLength();

Try using URLConnection.getContentLength as above. If the server doesn't specify a length, then you can't know.

answered Sep 04 '12 at 21:24

obataku

gives android.os.NetworkOnMainThreadException – Sagar Pujari Jul 21 '16 at 12:53
@SagarPujari that has everything to do with your code and not the snippet above; you are attempting to do blocking network I/O in the context of the application's main UI thread. consider using an [https://developer.android.com/reference/android/os/AsyncTask.html] to offload the work to run in a background thread – obataku Jul 21 '16 at 22:51

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